Danfoss AK2-SC 255 Reference Manual
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Danfoss AK2-SC 255 Reference Manual

Danfoss AK2-SC 255 Reference Manual

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REFRIGERATION AND
AIR CONDITIONING
AK2-SC 255
Reference Manual
Users Manual

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Summary of Contents for Danfoss AK2-SC 255

  • Page 1 AK2-SC 255 Reference Manual Users Manual REFRIGERATION AND AIR CONDITIONING...
  • Page 2 AK2-SC 255 Rack Controller System Reference Manual RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 3 AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 4 AK2-SC 255 and earlier controllers. If you can, you should check the Danfoss web site at www.acr.danfoss.com and select the menu item for product literature. The AK2-SC 255 literature will be in the Supermarket electronics section. DISCLAIMER...

  • Page 5: Table Of Contents

    ............................. 12 Selection of units and languages ......................... 12 Configuring Refrigeration ..................... 13 - 63 Starting with a partially configured AK2-SC 255 ..................13 Starting with a completely un-configured AK2-SC 255 ................14 Navigation and making changes ........................14 Entering numerals ............................. 14 Entering labels .............................
  • Page 6 Heating configuration, Seasons 4 Smart Coil ................. 96 - 97 Dehumidification configuration, Seasons 4 Smart Coil..............98 - 99 Condenser configuration, Seasons 4 Smart Coil ................... 99 Alarms configuration, Seasons 4 Smart Coil ..................99 RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 7 Sensor inputs (analog inputs), ClimaTECH ................ 106 - 107 On-off inputs (digital inputs), ClimaTECH ................107 - 108 Address and Initialization, ClimaTECH ..................108 Uploading ClimaTECH configuration to the AK2-SC 255 ..........108 - 109 1.4 Lighting Configuration ....................110 - 114 Beginning configuration ..........................110 AK2-SC 255 lighting zone setup ......................
  • Page 8 Viewing and changing setting ........................162 Changing numeric values .......................... 162 Changing list fields ..........................163 Changing the “From” and “To” times ....................... 163 Changing the days of the week and holidays .................... 164 Changing label fields ..........................164 RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 9 The Network Alarms screen ........................196 The Alarm Service screen ....................... 196 - 197 Overrides ......................198 - 200 Overrides using service screens ......................198-199 Overriding sensor values ........................... 199 Overrides using RO8S switches ......................199 AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 10 Overrides using the Manager’s Override box .................. 199 - 200 Keyswitch Override for refrigeration high temperature alarms ..............200 Using the Audit Trail ....................200 - 202 RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 11 AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 12: Part One Configuration

    PART ONE Configuration 1 - 1. Initial Configuration Note: We use the formal type designation “AK2-SC 255” occasionally in this manual, but ” most often you will see the short form of the name: “SC 255. Configuration of an AK2-SC 255 is easy using the keypad and display, and even easier using Danfoss AKA 65 Network Interface software running opn a PC con- nected to the controller.

  • Page 13: Using Menus

    °F or °C for temperature; and either % or fc (footcandles) for light level. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 14: 1 - 2. Configuring Refrigeration

    Partially Configured AK2-SC 255 If the AK2-SC 255 you are working with was supplied with a rack, the controller may have been partially configured by the rack manufacturer. In that case, when you select Refrigeration from the Main Menu, the SC 255 will display the Refrigeration Menu (left).

  • Page 15: Starting With A Completely Un-Configured Ak2-Sc 255

    The No of suction groups field is also constrained. It will only accept a single numeric character from 0 to 5, because a single AK2-SC 255 can control up to 5 suction AK2-SC 255 Reference Manual...

  • Page 16: Configuring Rack Info

    0 will cause deletion of all existing rack information. Refrig type (List box) The kind of refrigerant. Oil type (9 characters, not constrained) Monitor phase loss (List box: Yes, No) Whether or not there will be a RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 17: Adding A Rack

    To configure a suction group, press MENU to return to the Main Menu, then select Configuration, then Refrigeration. The Rack Configuration screen appears as at left above. Select the rack and a Configure Rack menu appears (as at left below) . AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 18 Low Temp PSIG target (-50.0 to 500.0) The pressure that the controller will maintain, subject to capabilities of mechanical equip- RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 19 Adaptive suction control (List box) None: No adaptive suction control. AK2-SC 255: Target pressure is adjusted based on discharge temperature of a single fixture. AKC 16x: Adaptive control of individual evaporators by an AKC 164 or AKC 161 Smart Case Controller.

  • Page 20: Configuring Two-Stage Systems

    (0 to 45) Number of seconds after suction pressure reaches target + the number specified in the preceding field that AKV valves will be closed. Rack on AK2-SC 255 address (0 to 15) The address of the SC 255 controlling the rack that serves these EEVs.

  • Page 21: Configuring Compressors

    Desuperheating temp (-50.0 to 200.0) Range +/- (1.0 TO 10.0) Configuring compressors To begin configuring compressors, select Compressors from the Configure Rack menu. The first page of the screen looks like this: AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 22 (List box:) Type of variable speed control. None: No inverter control VO: An inverter is controlled by an analog output (variable output). VLT: A Danfoss VLT adjustable frequency drive is used. Inverter min. speed (1.0 to 150.0) The minimum percentage of rated speed at which the inverter will run the compressor.

  • Page 23: Compressor Oil And Safety Information

    (0 to 60) After a reset (whether successful or not) the number of minutes that must elapse before another reset attempt. Monitor comp disch temp (List box: Yes, No) Whether or not compressor discharge temperature is monitored. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 24: Neutral Zone Control

    The default settings are as shown in the screen above. It is recommended that the values not be changed without a thorough understanding of the algorithm. A thorough explanation of neutral zone control is available as an appendix to this manual. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 25: Compressor Capacity Staging Patterns

    When all steps are on for a compres- sor, the next click on the icon will turn everything off. As you change a stage’s capacity, the number in the right column of the screen will AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 26: Configuring Evaporators

    SC 255 circuits and AKC 16x circuits. For the other types of evapo- rators, please see the manuals on the individual controllers. In the future, when a Danfoss Case Control manual is created, we will remove the AKC 16x material from this manual.
  • Page 27 (List box:) [for each individual evaporator] the type of evaporator control. AK2-SC 255/SUBC: A subcooler controlled as an SC 255 circuit. AK2-SC 255: The circuit is controlled by the SC 255’s algorithms. AKC 16x: Control is at the fixture by AKC 161 or AKC 164 Smart Case Controllers.

  • Page 28: Case Lights Button

    Configuring AK2-SC 255 subcooling circuits When subcooler valves are controlled directly by the SC 255 (that is, when an AKC RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 29: Configuring Ak2-Sc 255 Refrigeration Circuits

    Master, or DCU), refrigeration can be controlled directly by the AK2-SC 255. Con- figuration of such circuits starts by selecting AK2-SC 255 in the Type column for the circuit on the Evaporator menu, then moving the cursor to the word Setup for that evaporator and pressing ENTER.
  • Page 30 Enter user defined name (Label) The name of a user-defined fixture. Any of the characters in the AK2-SC 255 character set can be used, including upper and lower case letters and symbols. Monitor box door (List box: Yes, No) Whether or not a box door switch will be monitored (appears for boxes only).
  • Page 31 (List box: Yes, No) Whether or not there is a termina- tion relay for each case. Term.relay for each case (List box: Yes, No) Whether or not there is a termina- tion input each case. Paging down produces the next page: AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 32 Antisweat control (List box: Yes, No) Whether or not anti-sweat heaters will be controlled by the AK2-SC 255. When you configure an evaporator and answer Yes to the anti- sweat control question, a relay output is created which is then wired to a relay controlling the anti-sweat heaters.

  • Page 33: Configuring Defrost

    (List box: Yes, No) Whether or not to override defrost skipping on a dewpoint setting (next question). Don’t skip when DP above (1.0 to 3276.0) Defrost will occur regardless of skipping calculations whenever dewpoint is above this setting. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 34: Configuring Evaporators

    The right illustration shows the screen with all of its fields revealed. Additional information will be found in section (Chapter 4-5) on alarms. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 35: Configuring Condensers

    Configuring condensers Note: The contents of the second page of the condenser configuration screen will depend on what type of condenser control is chosen on the first page. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 36: Aircooled Condensers

    There are five configuration pages for aircooled condensers. In the first page are the following fields (refer to the illustration at right, above): Condenser type (List box:) This section deals with condenser configu- ration when the selection Air Cooled is made in this field. RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 37 Avg Cond Temp: This option is provided to allow for the control of a condenser that is being fed from multiple racks controlled by the same AK2-SC 255. Either dedicated pressure and temperature sensors can be installed and configured, or clones of existing...
  • Page 38 Neutral Zone: Danfoss Neutral Zone control will be used. This is a strategy that operates to move current value closer to target more rapidly the farther away the current value is from target.
  • Page 39 (List box: Yes, No) Whether the condenser inlet temperature is to be monitored. Fan inverter control [Please see notes on Neutral Zone selection in the section on the first condenser configuration screen.] (List box:) None: No variable speed drive is controlled. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 40: Split Condenser Control

    VO: An analog output, also known as a VO (variable output) point on a Danfoss I/O module will control the variable speed drive. VLT: A Danfoss VLT or AKD variable frequency drive will be used for motor control. These devices are connected by means of a 2-wire TP-78 LonWorks card.

  • Page 41: Reaction Zone And Time

    (0.0 to 500.0) The pressure above which split con- denser operation is disallowed. Reaction zone and time If control method is Target, the next page of condenser configuration has neutral zone control parameters for the PI control algorithm. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 42: Enviroguard Systems

    ® Enviroguard systems The next page is for setpoints that will be used with a Tyler Enviroguard system: The fields and contents are as follows: RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 43: Evaporative Condensers

    The fields are as follows: Condenser type (List box:) This section deals with condenser configu- ration when the selection Evaporative is made in this field. None: There is to be no condenser control by the SC AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 44 When additional capacity is required, fans will be reduced to minimum speed and an additional stage brought on, then all will be ramped up together, and so on. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 45: Pump, Louver, And Sump Schedules

    Neutral Zone: Danfoss Neutral Zone control will be used. This is a strategy that operates to move current value closer to target more rapidly the farther away the current value is from target. If you select Neutral Zone here, you will cause answer on inverter control on the second page following to change to None.

  • Page 46: Inverter Settings; Freeze Protection; Dump Valve

    (List box:) None: No variable speed drive is controlled. VO: An analog output, also known as a VO (variable output) point on a Danfoss I/O module will control the variable speed drive. VLT: A Danfoss VLT or AKD variable frequency drive will be used for motor control.

  • Page 47: Dump Schedules

    (List box: Yes, No) Whether or not there is a water flow monitor. Dump schedules The next page allows entry of the first four dump schedule. A subsequent page will be added if there are more than for schedules. Schedules have been explained in the AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 48: Receiver Configuration

    None: There is no liquid level sensor monitored. Heat reclaim configuration To configure heat reclaim, return to the Configure Rack menu, put the cursor on Heat Reclaim, and press ENTER. The screen is as shown below. RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 49 Lockout on liquid level (List box: Yes, No) Whether or not heat reclaim will be locked out on low refrigerant level. Liquid level sensor type (List box:) Sensor input: An analog sensor is used for liquid level.. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 50: Refrigeration Alarms Configuration

    (4) during the delay after defrost; and (5) when alarms have been suspended. The two delay periods are defined in the refrigeration configuration screen for the each circuit The meanings of the alarm action settings are as follows: RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 51: Board & Points Configuration

    To configure board & points information for refrigeration, return to the Configure Rack menu, put the cursor on Board & Points, and press ENTER. The screen is as shown below. For AK2 module board & point configuration, refer also to the AK2 I/O user manual. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 52: Navigation

    Be sure that each sending Board- Point combination is unique throughout the system. (If the controller at address #01 is sending from its Bd-Pt address 1-02, then no other controller can have an output at its Bd-Pt address 1-02 sending. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 53: Board & Points Sensor Inputs (Analog Inputs)

    (put the cursor on the field, and press +/- to enter edit mode; then use the left and right arrow keys to move from space to space and the up and down arrow keys to select the character for that AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 54 Type (List box:) AKS 32-100 Danfoss pressure sensor, 0 to 100 psig. AKS 32-200 Danfoss pressure sensor, 0 to 200 psig. AKS 32-500 Danfoss pressure sensor, 0 to 500 psig. PHOTO-OD-1 Danfoss indoor-outdoor photocell with type AKS 21 temperataure sensor.

  • Page 55: Board & Points On-Off Inputs (Digital Inputs)

    Yokogawa leak detector. HGM LEAK Provides refrigerant ppm for the channel given by HGM CHAN. 10A CT Danfoss 10A current transformer. 150A CT Danfoss 150A current transformer. 200A CT Danfoss 200A current transformer. Percent Any 1 to 10 Vdc sensor (readout 0 to 100%).
  • Page 56 Bd-Pt address; if sort mode is turned off, points will be listed from then on in the order in which they were created. The sorting occurs when you press EXIT and will be apparent the next time you enter the screen. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 57: Board & Points, Variable Outputs (Analog Outputs)

    When you select the “Other Controllers” icon and press ENTER, a menu is presented that allows selection of any of six types of other controllers that can be nodes on the control system I/O network. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 58: Akc 16X Circuits, Board & Points

    They can be edited character by character (put the cursor on the field, press +/- to change to edit mode; then use the left RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 59: Network Re-Scan And Initialization

    After the re-secan, return (via the Main Menu) to the AKC 16x Board & Points Configuration Screen, and 4. Put the cursor on the Init field and press ENTER. This action sends the configuration settings from the AK2-SC 255 to the Danfoss Smart Case Controller. Navigation Notice that at the bottom of each of the Other Controllers screens there is a row of icons.
  • Page 60 3. From the I/O Network Menu, select Re-scan. Re-scanning the network can take several minutes. After the re-secan, return (via the Main Menu) to the EKC Board & Points Configuration Screen, and 4. Put the cursor on the Init field and press ENTER. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 61: Wink

    Board & Points After Degree Master controllers have been configured and addressed (in accordance with the Danfoss manual Degree Master in AKC 55 Systems (literature number RS.8B.F1.22 (or update), code number 084R9897) you need to re-scan the network so that they are recognized, then initialize them. This is done from the Degree Master Controls Board &...

  • Page 62: Locate Procedure

    VLT and AKD drives Board & Points To configure Board & Points for Danfoss VLT and AKD variable frequency drives, select the variable speed drive icon (fourth from the left) on any Configure Board & Points Other Controllers screen and press ENTER. The screen looks like this (though you see only one here, all configured VLT drives will be listed.)

  • Page 63: Dcu Circuits, Board & Points

    SC 255 screen, go to the VLT and press the service pin. The SC 255 will then read the VLT address, which will appear on the screen to the right of the Locate field. DCU circuits Board & Points Section to be added. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 64: Configuring Hvac

    When the name appears as you want it, press RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 65 RTU: The unit is a packaged rooftop unit. AHU: The unit is a built-up system with an air han- dling unit. RTC: The unit is controlled by a Danfoss RTC board. SC4: The unit is a Seasons 4 Smart Coil packaged rooftop system.
  • Page 66 Shutdown on smoke detect (List box: Yes, No) Whether or not the unit is to be shut down when its smoke detector is on. Shutdown on fire alarm (List box: Yes, No) Whether or not the unit is to be shut down when a monitored fire alarm is detected. RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 67 Status screens are covered in seciton II of this manual. No: The fan will not be locked out on proof failure. RTU cooling configuration RTU cooling is configured after selecting cooling from the RTU configuration menu. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 68 There is one field for each stage. Post delay for stage (0 to 60) The number of minutes that must elapse after target - range is reached before the stage will be turned off. There is one field for each stage. RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 69 Night setback (List box: Yes, No) Whether or not the cooling setpoints are to be raised by an offset (next line) during AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 70 Average: Control will be based on the average of all the temperature sensors in the unit’s zone. Zone Temp 1-1 (etc.): (each zone temperature sensor will be available as a choice in the list) Control will be based on the single selected temperature RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 71 (0.0 to 50.0) The number of degrees above the lockout setting where heating will be shut down. Also, the number of degrees below the lockout setpoint where heating will be allowed after being locked out. RTU Heating auxiliary heat configuration, p2: staging strategy AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 72 RTU Heating auxiliary heat configuration, p2: analog valve strategy With an analog gas valve selected, the second heating page looks instead like this: RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 73 Min valve opening (0.0 to 75.0) Sets the maximum valve opening al- lowed. Degrees to max opening (0 to 6) The number of degrees of rotation of the valve spindle from minimum to maximum percentage. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 74 Control sensor (List box, if controlled by dewpoint or humidity only, and if there are multiple sensors:) Min Humidity or Min dewpoint: Control will be based on the lowest-reading of a group of sensors. RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 75 There is one field for each stage. Cooling low limit (0.0 to 100.0) If zone temperature is below this limit, dehumidification will be disallowed. RTU dehumidification configuration, page 2 Fan speed (List box: Low Speed, High Speed) The fan speed AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 76 Num of schedules (0 to 8) The number of schedules that will be created (below, and on following pages if needed) for air RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 77: Rtu Alarms Configuration

    Only the fan and outside air coil configuration for AHUs is different from configura- tion for RTUs that was spresented in the previous section. AHU fan configuration There are two pages for AHU fan configuration: AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 78 Variable VO: Fan speed is variable, with a drive controlled by an analog output board (variable output board). Variable VLT: A variable speed fan is controlled by a Danfoss VLT adjustable frequency drive. Fan control OPEN hours (List box:) Continuous: The fan will run continuously during open hours.
  • Page 79 Shutdown on smoke detect (List box: Yes, No) Whether or not the unit is to be shut down when its smoke detector is on. Shutdown on fire alarm (List box: Yes, No) Whether or not the unit is to be shut down when a monitored fire alarm occurs. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 80 Min Temp: Control will be based on the lowest value of all temperature sensors in the unit’s zone. Max Temp: Control will be based on the highest value of all of the temperature sensors in the unit’s zone. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 81: Rtc Configuration

    The Danfoss RTC control board can function as a stand-alone or as a node on the I/O network of an SC 255 system. To begin configuration, select RTC as the type of unit in the Configure HVAC menu. A menu for the unit is then presented by the system.
  • Page 82 LAT (leaving air temperature) is less than this setpoint. Aux Heat ramp up if LAT > (0.0 to 100.0) When heating is on, fan speed will be ramped up when LAT (leaving air temperature) is RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 83 (List box: Yes, No) Whether or not phase loss will be monitored. Shutdown on phase loss (List box: Yes, No) Whether or not the unit is to be shut down when its phase loss detector input is on. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 84 There is one field for each stage. Post delay for stage (0 to 15) The number of minutes that must elapse after target minus range is reached before the stage will be turned off. There is one field for each stage. RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 85 (0 to 60) The minimum number of minutes cooling must run after being turned on before being turned off. Minimum OFF time (0 to 60) The minimum number of minutes cooling must remain off after being turned off before being turned on. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 86 No heat above (0.0 to 100.0) The ambient temperature above which heating will be locked out. Night setback (List box: Yes, No) Whether or not the heating setpoints are to be lowered by an offset (next line) RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 87 (List box, if controlled by dewpoint or humidity only, and if there are multiple sensors:) Average: Control will be based on the average of a group of sensors. High: The high value of a group of sensors will be used. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 88 You will use one of two pages, depending on whether economizer control is used: Air Damper (List box: Yes, No) Whether or not there is a con- trolled air damper. Control method (List box:) Fan ON: The damper will be open whenever the fan RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 89 Max Damper Position (0.0 to 100.0) When a variable out is controlling, the maximum percentage of damper opening allowed. Variable Output range (List box:) When a variable out is controlling, the AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 90: Rtc Schedules

    Reaction Time (1 to 99) This setting, together with the next, deter- mines the sensitivity of variable output control. It should be adjusted only by a Danfoss-trained techni- cian. Algorithm Interval (1 to 15) This setting, together with the previous one, determines the sensitivity of variable output control.

  • Page 91: Relay Outputs (Digital Outputs)

    (1 to 8) The number of the point. Name (Label field, contents depend on system configuration) The name of the point. The names are fixed, since the hardware points on the RTC board are dedicated, and AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 92 Config (List field, one for each point:) Yes: The input is configured. It should be wired if this answer is given, or the configuration should be RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 93 Configuring RTC I/O variable outputs Here is the screen for variable (analog) outputs, reached with the fourth icon from left. The names appear if the points are configured. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 94 0-5 Volts: The output will supply The input is config- ured. It should be wired if this RTC Address and Init Select the right-most icon on the Configure RTC I/O points screen, and you will see this screen: RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 95 Shutdown on smoke detect (List box: Yes, No) Whether or not the unit is to be shut down when its smoke detector is on. Shutdown on fire alarm (List box: Yes, No) Whether or not the unit is to be shut down when a fire alarm monitor detects a fire AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 96 (-9.9 to 9.9) The range selected creates a dead band. For example, if the target is 72 and the range is 2, the stage will come on at 74, and will not be turned off RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 97 (0 to 4) The number of heat reclaim stages in the SC4 unit. Setpoint (0.0 to 100.0) The desired temperature at the control- ling sensor when heat reclaim is being used. Range +/- (0.0 to 9.9) The range selected creates a dead band. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 98 Override duration (0 to 1439) The number of minutes that control will be overridden after operation of the override switch. Num of schedules (0 to 8) The number of operating schedules entered on the following page(s). RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 99 (next page). Night setback offset (0 to 99) The number of % by which the dehumidifica- tion setpoint is to be raised during night setback. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 100 SC4 alarms configuration SC4 alarms are configured as are RTU alarms. SC4 board & points configuration SC4 board & points are configured as are RTU board & points. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 101: Climatech Configuration

    ClimaTECH configuration Danfoss supplies two models of ClimaTECH HVAC controller, the ClimaTECH 65 and the ClimaTECH 1024. Configuration of these two controllers proceeds in the same way. The ClimaTECH 1024 has a larger control capacity. The ClimaTECH configuration menu appears below: There are two fan configuration screens, depending on whether the fan is fixed speed or variable speed.
  • Page 102 ClimaTECH cooling configuration Num of cooling stages (0-6) The number of cooling stages in the HVAC unit. Occupied setpoint (0.0 to 150.0) The cooling setpoint during operating RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 103 Store Info screen. Unoccupied setpoint (0.0 to 150.0) The zone temperature setpoint for auxiliary heat during store closed hours as configured in the Store Info screen. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 104 Also, the minimum time each stage must run before being turned off. Aux heat/dehumid lockout (List field: Yes, No) Whether or not auxiliary heat is to be locked out when dehumidification is running. A yes RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 105 (-40.0 to 150.0) The target The number of stages of auxiliary heat in the HVAC unit. Outside dewpoint target (0.0 to 150.0) The heat reclaim setpoint during store closed hours as configured in the Store Info screen. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 106: Alarm Configuration, Climatech

    Relative, and the default zero settings are left for all schedules, then the HVAC unit will operate based on the store open hours set in the Store Info screens. ClimaTECH I/O configuration A ClimaTECH unit’s points must be allocated and assigned using the I/O points screens. RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 107 If this feature is not used, leave group number set to 0. Inside dewpt group # (0 to 99) The group to which this ClimaTECH unit belongs for AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 108 Point The point assigned to each functional input. If the input is not used, leave the Point field set to 0. Type (List box:) The type of input. Only OI is a valid choice. None RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 109 Override switch (List box: Yes, No) Whether or not there is an over- ride switch wired to a digital input. Override duration (0 to 1439) The number of minutes that control will be AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 110 (List box: No, Rec) No: The sensor is not used. Rec: A sensor value is received from the system’s I/O network. AK2-SC 255 Bd-Pt Enter the board and point from which the sensor value is to be received. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 111: Lighting Configuration

    (Label) The name of the zone as established on its first setup page. Type (List box:) AK2-SC 255: The zone is controlled by a relay output (digital output) on the I/O network. PWRLK: The zone is controlled by a breaker or group of breakers in a Square D Powerlink ®...
  • Page 112 Schd and photo: For this point to be on, two condi- tions have to be satisfied: (1) the schedule must be true; and (2) the photocell must be above trip level. Once those two conditions are satisfied, the pre-delay RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 113 Post delay (0 to 120) When lights are on, the number of minutes that the lighting condition must be false before lights AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 114: Board & Points Configuration, Lighting

    Configuration of Powerlink lighting zones configuration is the same as for the SC 255 zones just discussed, except that the question Number of control relays is replaced with Number of control points. These panels also require board and point setup and initialization (see below). RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 115: Lighting Configuration

    Cutler-Hammer panels do not require the locate procedure. Energy Meter Configuration An AK2-SC 255 system can monitor Danfoss-approved energy meters which have an Echelon interface. Each AKC 55 can monitor up to five meters. Each current source must have a dedicated meter.
  • Page 116 No of KWH Utility Meters (0 to 16) The number of meters being configured Name (Label field, any 11 characters) Enter the name of the meter being configured. Type (List box) The AK2-SC 255 currently supports the following energy meter models: RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 117 EMON (although no longer marketed by Danfoss) Wattnode Wn Plus Wattnode plus. Configuration of Wattnode Plus is covered in this manual on the third page follow- ing this one. Pulse: Pulse metering via an AK2 I/O module. >Setup< (button field) Put the cursor here and press ENTER to begin setup.
  • Page 118 Number of normal steps [Demand limiting only](0 to 10) The number of steps (levels) which you will allow to be shed under normal conditions. Num of emergency steps [Demand limiting only](0 to 10) The number of steps RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 119: Configuration

    Demand period: (5-720, default 15) The interval over which demand is calculated. Demand is defined as average power over a specified time interval. Demand subintervals: (1-8, default 1) The number of divisions of the demand period used when calculating a AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 120: About Soft Starts

    In order to use demand limiting, you must have a Danfoss-approved utility meter with Echelon interface and, if you are going to establish both normal and emergency load limits, you must wire and configure an on/off input for the automatic transfer switch.

  • Page 121: Lighting Demand Limiting

    How demand limiting works Utility demand is monitored every minute. Every minute, the most recent n minutes AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 122: Configuring Alarms

    HVAC and other configuration screens will present an alarm selec- tion. Using the method just described, though, you will be able to reach the entire “world” of alarms from one menu. The Alarm Configuration menu looks like this: RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 123: Configuring Refrigeration Alarms

    Bitzer was selected as the answer to the proofing type question. Keep in mind that as we proceed through alarm configuration, the items that present them- selves depend upon the configuration for the mechanical devices. Select Suction and the first page of configuration for actual alarms appears: AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 124 The first alarm on the first page of every rack alarms screen is an Alarms Sus- pended alarm. This alarm occurs whenever alarms have been suspended by an operator using the Rack Service screen. When alarms are suspended, if the level of RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 125: Configuring Alarms

    Move the cursor down to the level field for the Phase Loss alarm. It currently reads Disabled. When you select the field, a list box ap- pears showing all the levels that can be chosen for the alarm, as shown at right below. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 126: Rs.8D.m1.22 Ak2-Sc 255 Reference Manual

    (as seen below) from which you can choose sec, min, or hour. For the Phase Loss alarm, 1 minute is an appropriate setting, so we leave the field reading min. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 127: Analog Alarms

    Normal, the alarm will dial out only once. The timer will reset to 0 any time the pressure rises above 3.0 psi; only after the timer has reset in this manner can the alarm occur again. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 128: Analog Alarms

    For the low suction pressure alarm, first look at the cut-out setpoint that has been configured for the rack. With a target of 14 psi, perhaps the cut-out is set at 2 or 3. If RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 129: Types Of Suction Alarms, Listed

    We will return now to the configuration screen for rack C alarms, and select Com- pressors. The first page of the compressor alarms screen appears as at right above. For a multi-compressor rack there will be several pages of alarms. The alarm types depend AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 130: Circuit Alarms

    SC 255 I/O, or by one of the various types of Danfoss case controllers.After selecting Circuits from the rack alarms menu (shown once again at left) you will be presented with a list of configured evaporator circuits (which will vary greatly de- pending on what circuits you have configured).
  • Page 131 Enabling the alarm also caused the appearance further down the screen of a question about a Key switch override. The following screens show the second alarm configured, and the key switch override AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 132 255. The alarms are enabled and disabled through the SC 255 and if enabled, will be dialed out by the SC 255 when they occur. The alarm configuration screen for an AKC 164 circuit looks like this: RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 133 Occur when the AKC 164 detects failure of one or more of its sensors. Alarms for EKC, DCU Degree Master, and AKC 165 Subcooling controllers Configuration of alarms for these controllers is not covered in this manual, but in the separate literature for the individual controllers. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 134: Condenser Alarms

    A digital alarm that can be enabled to occur when a condenser fan is called to run and fails to show proof (digital monitor fails to read ON) within the time period specified in the alarm (1-9999 seconds, minutes, or hours). RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 135: Other" Rack Alarms

    After selecting Bitzer from the rack alarms menu, it it is then necessary to select the individual compressor. We have omitted the screen that lists the compressors from the illustrations below. The alarm types are shown below the screen illustrations: AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 136: Hvac Alarm Configuration

    The unit types listed are as follows: Air handling unit. A built-up system. Rooftop unit. A packaged rooftop unit. Rooftop controller. Any HVAC system controlled by a Danfoss (networked or standalone) RTC board. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 137: Ahu, Rtu, And Sc4 Alarms

    HVAC fire (if an HVAC fire stat is configured) A digital alarm that can be enabled to occur when a fire stat monitor reads on for a specified time period (0-9999 seconds, minutes, or hours). AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 138: Rtc Alarms

    (the fire stat is wired to an AKC 55 digital input board, not to the ClimaTECH controller; it is broadcast to the ClimaTECH over the AKC 55’s I/O network. The alarm configuration screen for a ClimaTECH controller is shown below: RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 139: Miscellaneous Alarms

    ClimaTECH controller. It is presented on this screen because it pertains to the system whose alarms are being configured. Configuring Miscellaneous alarms Returning now to the main Alarm Configuration Menu, the next item after HVAC is Miscellaneous. Using the the miscellaneous alarms screens, you can create custom AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 140: Miscellaneous Alarms

    In this example, the meat prep room is controlled by a Smart Case Controller. To find the temperature sensor, we must select the case controller icon once we have arrived at the first miscellaneous alarms screen shown at right above. The screen might appear as at left below. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 141: Number Of Alarms Field

    In the example at right above, we’re changing the level to Normal. Miscellaneous Points Configuration Whenever you need to create a custom control strategy, or define an on/off input or AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 142: Starting Configuration

    Alarms can be created for any miscella- neous point. For sensor inputs, the AK2 system allows custom conversion for non- Danfoss sensors that have a linear response. Starting Configuration The way you begin configuration of a miscellaneous point depends on whether there are any miscellaneous points already configured.

  • Page 143: Miscellaneous Relay Outputs

    The field contents which may be selected, and the range of values for each, are as follows: Units: psi, (bar), F, ( C), ppm, V, Amp, kw, kwh, Hz, gpm, fps, pH% Min input: 0.0 - 10.0 Max input: 0.0 - 10.0 Min output: 0 - 3276.7 AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 144: Miscellaneous Calculations

    The current value or state of the point. This will be on or off for OI points, and a value for SI points. Status (Online, Offline, Error) New Calc At the bottom left of the screen is a field with the RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 145: Point Creation

    The date and time at the very top, then the settings icon and screen title, in this case Configure Ca-01 (OI). Heading area The heading of the screen tells what type and style of point will be created. The fields are as follows: AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 146: Custom Strategy Example

    Now we will create the first of the sensor inputs we will need, that for the leak detector. Exit to the Configure Miscellaneous menu and select Sensor Inputs. The configuration is straightforward for both of the sensors we need: RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 147: Writing The Custom Strategy

    Move to the data definitions area of the screen, and put the cursor over the first name, which by default says RO1. Toggle to edit mode and open the list box, and the screen will look as at left below. Select SI °F from the list box and press ENTER. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 148 0.0°F to 90.0°F, which is the temperature setpoint in the strat- egy we are creating, and the screen will appear as at right. Again, the value field has changed to reflect the value of the defined point. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 149: Data Definitions

    When evaluating the logic in the rules area, the controller will go line by line in the rules area, and stop at the first statement that it finds true. We want the OI to be AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 150: The Rules Area

    The controller’s logic processor will stop at the first true statement and produce whatever result is in that statement’s result column. The screen, with the first line complete in the rules area, looks like this: RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 151 90, or refrigerant is sensed at 500 ppm or more, turn on the fan; else, turn off the fan.” This is exactly what we set out to do. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 152: Creating The Miscellaneous Points Relay Output

    Notice the character > that is in reverse video in our example above. This is a button field, and when it is selected, ENTER will take you to the next page. Initially, the second page of this screen appears as at left below. RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 153 The other fields on the screen are timers. To keep the exhaust fan from cycling too rapidly when the temperature is hovering near the setpoint, we will set a 10 minute post delay. The finished screen looks like this: AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 154 Cut In/Out (OI only) Latch (OI, SI) Once turned on by a true rule, the point will remain on until a physical switch (wired to an OI) is operated to turn it off. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 155: Configuring Authorization

    Notice that you can also set the language(s) for the audit trail. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 156: Configuring Units And Languages

    (List box: PSI, bar) Temperature: (List box: °F, °C) Date: (List box: four date formats are offered) Time: (List box: 12-hour, 24-hour) Language: (List box: English, Spanish, Portuguese, German, Chinese, Japanese) Light level: (List box: percentage, foot-candles) RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 157 AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 158: Authorization -- "Just Looking

    PART TWO Using the Status Screens and Service Functions Using an AK2-SC 255 system is simple and is best learned at the controller or by using AKA 65 Network Supervisor software to examine a real system. Everything starts at the Main Menu. You can get the Main Menu, if it isn’t the screen you see on the controller, by pressing the MENU key.
  • Page 159 After several minutes of inactivity, the access level will revert to “view only.” If you want to log off and immediately prevent access by others without authorization, go to the Authorization screen, put the cursor on the <Log Out> button, and press ENTER. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 160: Navigation And Making Changes

    On the Main Menu, notice that one of the menu items is in reverse video – that instead of the text being dark on white background, it is white on a dark background. RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 161 Now, let’s look at one of these items. With the cursor on Suction Groups, pressing ENTER brings up a screen that lists the suction groups on the rack. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 162 Alarms Service Authorization You can move the cursor from icon to icon with the left and right arrow keys. Once the cursor is positioned, pressing ENTER will take you to a screen for the function RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 163: Getting Back To The Icon Menu

    At your PC, right click on the field, and type from the keyboard. Remember that if a field has a decimal point, you must enter a digit (even a zero) for each place to the right of the decimal point. When AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 164: Changing List Fields

    To change from AM to PM after entering the new time of day, open AM-PM list box and select the one you want. When the entry reads as you want it, press ENTER to save the new time and to restore the arrow keys to their navigation mode. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 165: Changing The Days Of The Week And Holidays

    When all the characters have been entered in the way you want them, press ENTER to save the change and restore the arrow keys to their navigation function. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 166: Using The Service Screens

    Next to the name of each one is a control status field. You can select: Auto The AKC 55 is controlling the on-off relay output. Manual On The relay output is in override and will remain ON RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 167: Reset

    Select Sensor Adjustment from the Suction Service menu, and this screen appears: ach sensor’s current reading appears next to its name. There are three additional columns: (List box: M, blank) This field allows you to set a the AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 168: Maintenance Hours

    <Clear> button at the bottom of the screen. The date of last clearing is also displayed. Bd/Pt Locations This screen is identical in function to the Board & Points screens described in Part I, Section 1.2, “Configuring Board & Points.” RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 169: Using The Smart Case Controller Screens

    Using the Smart Case Controller Screens The AK2-SC 255 has special screens which allow you to examine many functions in each of the fixtures where Danfoss Smart Case Controllers are installed. Begin at the status screen for a Smart Case fixture: The first line of the screen body shows the fixture’s current status.
  • Page 170 Start-up status. This cycle will be repeated until a positive superheat is established. After thirty minutes in Low super- heat status, an alarm will be generated. Defrost: A scheduled or manually initiated defrost is in RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 171 AKC 16x Settings screen. Sensor failure: The Smart Case Controller has detected a failure of one of the sensors configured for the fixture, either Liquid In, Gas Out, Case/Box, or Defrost tempera- AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 172 If “Yes,” then defrost for all fixtures in this group is coordinated. Drip Down: The time in seconds allowed after defrost for the fixture to drain before refrigeration begins. Fan Delay: The time in minutes after defrost during which case RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 173: Evaporator Schedules

    There are four fields in which the operating mode for Defrost, Antisweat, Lighting, and Fans can be selected. The modes which can be selected are: Auto: The function is controlled by the normal operation of the Smart Case Controller. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 174: Evaporator Service

    Evaporator service Case Cleaning (Smart Case Controllers) The Case Cleaning screen for Smart Case Controllers offers a quick way to shut down individual fixtures for cleaning. When the Case Cleaning status is changed RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 175: Using The Refrigeration Screens For Refrigeration Circuits

    2 - 4. Using the Refrigeration Screens for Refrigeration Circuits Controlled directly from AK2-SC 255’s The status screens for refrigeration circuits controlled directly from SC 255’s contain different information than those for circuits with Smart Case Controllers.

  • Page 176: Evaporator Settings Screen

    The evaporator schedules screen shows defrost schedule information and allows changes to number of defrosts, duration, and start times. Evaporator Alarms Screen The evaporator alarms screen lists all active alarms for the circuit. Evaporator Service Screen The evaporator service screen is covered in RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 177: Using The Communications Screens

    (Online or Offline) of each. Our example below shows o0nly one 255 on the network, but there may be more in the system you are working with. I/O Network Status Menu The I/O Network Status menu looks like this: AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 178: I/O Network Status Screen

    The addresses may be in the form nn-n, or in the form nn-n.n. These formats indicate, respectively, RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 179 Other controllers The Other Controllers selection includes a number of diverse kinds of network nodes that can be appreciated from the menu that appears when the Other Controllers icon is selected. The menu is shown below: AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 180: List Nodes

    In the sample screen, we have chosen to accept the default view, “All.” Using the list box in the View field, you can choose todisplay initialization and version information as well. These options are shown at left and right below. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 181: Ip Network (Ethernet)

    IP Network (Ethernet) Before theintroduction of the AK2-SC 255, theDanfoss AKC 55 systems used third party Ethernet adapters. In the 255, Ethernet communications is supplied on board the controller and no outboard equipment is required. The Ethernet configudration screen is shown below.

  • Page 182: Alarm Routing For Ethernet

    The numerals that appear to the right of the listed telephone numbers and IP ad- dresses correspond to the numerals that head the columns in the upper part of the screen. Paging down shows additional information in the bottom panel: RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 183: Printer Settings Screen

    To receive alarms, a serial printer can be connected to one of the AKC 55’s in the host network. The printer is attached to the RS232 port. To configure the port for the local printer, from the Main Menu select Communica- tions, Printer. The Printer Settings screen will appear: AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 184 You must also go to the field labeled “Printer” in the lower half of the screen and enter the address of the AK2-SC 255 to which the printer is attached. RS.8D.M1.22...

  • Page 185: Modem Configuration

    Consult the modem manual for the proper commands. If the modem was supplied by Danfoss, instructions will accompany it, or you may call Danfoss Technical Support for assistance. Baud — Enter the transmission speed in “baud” or bits per second, for the modem being configured.
  • Page 186 PBX which makes it necessary to wait momentarily, after dialing a prefix, for an outside line dial tone. Multiple commas can be used for longer waits. Delay: — The delay (from 0-99 minutes) imposed by the RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 187: Messages Screen

    Time: — The time format, either 12 hour or 24 hour. Schedules: — The schedule for dialouts to this phone number. Messages By selecting Messages from the Communications menu, a messages screen appears: AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 188: Using The History Screens (For History Retrieval)

    ENTER at the end of each line. Using the History Screens (for History Retrieval) To view history, select History from the Main Menu, and the History Menu appears: Next, select Retrieve History, and you will see the Configure History Display screen RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 189: Selecting Points To View

    ENTER. Here’s how a screen would look with five datapoints (two relay outputs and three sensor inputs) selected: AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 190: Displaying History

    Most of the time, when viewing history on the SC 255’s display, you’ll want to select the datapoints from the various I/O screens and use the View button. Doing so (having made the selections shown in the illustration above) will result in a history display like this: RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 191 The Graph button will present a graph of the displayed data. If the display is in Latest mode, the graph will plot as each new sample is collected. A typical graph screen looks like this one:: AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 192 Realtime/Snapshot Viewing is in one of two modes. In realtime mode, the history is graphed as it is collected. In snapshot mode, any of the collected history can be examined. The “<“ RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 193 To change the twenty-four hour period covered by the statistics report, return to the History display screen and scroll until the last line on the page is the ending time you want for the statistics report; then press Stat again. AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 194: Using The Alarms Screens

    Alarms which reoccur can appear more than once. Configuration Configuration takes you to the Alarm Configuration Menu. Alarm configuration is covered in Part One of this manual. RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 195 The value will always be outside the alarm limits. Ack: Indicates, by Yes or No whether the alarm has been acknowledged or not. If you select one of the alarms, a screen with additional information for the alarm will appear: AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 196: The Cleared Alarms Screen

    Active Alarms screen. The Alarm Status Screen The Alarm Status screen lists every alarm configured for the SC 255, giving its name, type, status, and alarm conditions: RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 197: The Network Alarms Screen

    SC 255’s in the network. The format of the screen is the same as the format of the Active Alarms screen and the Cleared Alarms screen which are discussed above. The Alarm Service Screen The Alarm Service screen is reached by selecting Service from the Alarm Configu- ration menu. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 198 Suspends alarms. When you answer yes to this question, another line will appear beneath it asking you to specify a time period (from 1 to 255 hours) during which no alarms will occur (effectively, all alarms are disabled). RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 199: Overrides

    Overrides An AK2-SC 255 system provides for overrides through service screens, the reset switches on RO8S boards, the Manager’s Override box, and the keyswitch override. Overrides Using Service Screens A typical service screen is the one for relay output boards. There is a similar screen for on/off input boards: The first three menu items can be used to override control.

  • Page 200: Overriding Sensor Values

    The green light will blink for up to fifteen seconds until the SC 255 recognizes the switch; then the light will go off and the override will end. RS.8D.M1.22 AK2-SC 255 Reference Manual...

  • Page 201: Overrides

    “log” shows every system access whether from an SC 255 keypad, from a local terminal, or from a remote location via modem. Whenever someone gains entry to an AK2-SC 255 system, the system keeps a record of the date and time of entry, the point of entry, and the authorization level and account code used.
  • Page 202 < — an operator that moves the screen one entry forward in time. 00028..00026 — shows the range of entries displayed on the current page. RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 203 — shows the oldest entry in the audit trail database. When the database is filled to capacity, the next entry will cause the oldest to be deleted, so this number can be other than 00001. AK2-SC 255 Reference Manual RS.8D.M1.22...
  • Page 204 RS.8D.M1.22 AK2-SC 255 Reference Manual...
  • Page 205 AK2-SC 255 Reference Manual RS.8D.M1.22...

  • Page 206: Baltimore, Md

    Danfoss, Refrigeration & Air-Conditioning Division, 7941 Corporate Drive, Baltimore, MD 21236 Tel. 410-931-8250, Fax 410-931-8256, Direct Order Fax 410-931-0677, www.acr.danfoss.com RS.8D.M1.22 ©Danfoss 2005...

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