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Guardian SCC-50 Operation And Setup Manual

Screw compressor controller
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GUARDIAN
SCC-50(AQUAT)
Screw Compressor Controller
• Compressor status monitor with pressure, temperature, slide and load
displays
• Control by suction or remote pressure setpoint
• Control by suction equivalent or chiller temperature setpoint
• Alarm and trip monitoring with optional motor winding temperatures
• Compressor, pump, slide and speed control
• Economiser, heater and liquid injection control
• Automatic volumetric slide control via optional stepper motor
• Multiple compressor system control
• Local panel operation and set-up with optional remote pushbutons operation
• MODBUS communications for remote monitoring and set-up
• xx
•
.
Operation and Setup
GUARDIAN SCC-50 Screw Compressor Controllers provide suction pressure
setpoint control and alarm monitoring for one screw compressor. Alternatively the unit may
be set-up to control on water chiller, glycol chiller or equivalent temperature.
The SCC50 unit supersedes its SCC40 predecessor and provides increased response,
input/output signal capability, control and communication facilities.
The SCC50 still uses the SCC40 operator control Panel.
GUARDIAN SCC-50 Operator Manual
GUARDIAN
Tel. +44 (0) 1270 760599
Fax. +44 (0) 1270 766804
Email:
sales@Guardian-controls.com
www.Guardian-controls.com
Page 1
Manual
Issue V1.0b 09/05/02

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Summary of Contents for Guardian SCC-50

  • Page 1: Scc-50

    • Manual Operation and Setup GUARDIAN SCC-50 Screw Compressor Controllers provide suction pressure setpoint control and alarm monitoring for one screw compressor. Alternatively the unit may be set-up to control on water chiller, glycol chiller or equivalent temperature. The SCC50 unit supersedes its SCC40 predecessor and provides increased response, input/output signal capability, control and communication facilities.

  • Page 2: Table Of Contents

    Functions ........................... 9 Displays ........................... 10 Pushbuttons........................10 GENERAL SPECIFICATION ....................12 Consultant Mimic Format SCC-50 Standard ..............13 AVAILABLE UNIT MODELS ....................14 SCC-50 Input/Output Signals ..................15 SCC50 Fuse Ratings ...................... 16 SCC50 FUSES and LED LAYOUT ................. 17 SCC-50 Termination Wiring - ..................
  • Page 3 MODBUS SYSTEM SETTINGS ADDRESS ..............72 CONTROL HIGHWAY COMMUNICATIONS ..............73 Control Highway Communication Wiring ................. 74 MAIN SET-UP/ COMMISSIONING PARAMETERS ......74 Setup / Commissioning Parameters ................79 PRESSURES ........................79 TEMPERATURES ......................80 GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 4 DIFFERENTIALS ......................81 TIMERS ........................... 82 Settings display and change facilities................83 SCC-50 Enclosure wiring: for trips negative ..............85 SCC-50 Enclosure wiring: for trips positive..............86 Standard Wallbox Internal wiring..................87 Standard SCC 40 Drawing ....................88 FITTING NEW EPROM ................

  • Page 5: Getting Started

    All users require to know a few basic facts about this controller before successfully starting to perform their design, commissioning, maintenance or operating functions. All GUARDIAN controllers need to be set up with a unit model selection and other basic settings for setpoints, timers and addresses.

  • Page 6: Button Operation Shorthand

    Means the display alternately flashes between identifier and trip message HARDWARE CONFIGURATION CHECKS Prior to switching on the GUARDIAN controller check that the hardware unit is the correct type for the incoming mains voltage. When satisfied that the correct type of controller is available then the following checks should...

  • Page 7: Configure Unit Model, System No & Address

    Display shows unit model currently selected which may be wrong. Press ‘raise’ repeatedly until correct model is displayed (e.g.SC30) and then press ‘accept’ which causes the display to wink briefly and display the new unit model selection (e.g SC40 ) GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 8: Select System No And Address

    RS485 Communications When the correct system number, case/compressor number and highway address have been entered as above then the controller can communicate with the GUARDIAN Consultant Terminal PC for central alarm monitoring and temperature display. Control setpoints, defrost times and alarm limits may then be sent to the controller from the PC.

  • Page 9: Unit Models

    Page 9 UNIT MODELS Guardian controllers may be configured in a number of different ways dependent on unit model selection. Each unit model fulfils a different refrigeration temperature monitoring and control requirement. In order to perform the required refrigeration control then each model has different uses for the controller’s input output signals.

  • Page 10: Displays

    Pushbuttons on the local control panel permit operator display of setpoints, pressures, temperatures, alarm and trip settings and compressor runhours and status. Setpoints, alarm and trip settings may be changed from the panel after entry of the appropriate passcode. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 11 In LOCAL automatic mode, the compressor is started and stopped under control of the suction pressure setpoint. REMOTE automatic mode allows up to eight RCC-40 units to be connected via a two-wire communication link (RS485) to provide 8-unit system control. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 12: General Specification

    Control unit: 300 x 230 x 90mm The GUARDIAN SCC-50 control unit comprises a printed circuit board xx for mounting at the rear of the compressor pack control panel with the display unit mounted on the door and has overall dimensions:- 300 x 230 x 90mm.

  • Page 13: Consultant Mimic Format Scc-50 Standard

    Page 13 Consultant Mimic Format SCC-50 Standard GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 14: Available Unit Models

    Page 14 AVAILABLE UNIT MODELS The Guardian SCC-50 controllers are available in two models, with the following options: SCC-50 Standard 6 pressures 6 temperatures 9 output relays 4 12V dc inputs 4 Mains inputs 8 Trips 2 Analogue outputs 1 Real time clock...

  • Page 15: Scc-50 Input/Output Signals

    Auto VI Stepper Motor PHASE 1 12vdc Dig OP E Auto VI Stepper Motor PHASE 2 12vdc Dig OP F Auto VI Stepper Motor PHASE 3 12vdc Dig OP G Auto VI Stepper Motor PHASE 4 12vdc GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 16: Scc50 Fuse Ratings

    3.5 A - T 0454 03.5 24 Vac Incoming TB3-1 F401 125 mA 0453 .125 24 Vdc supply TB10A-4 TB10-4 TB6-16 TB6-12 TB6-8 TB6-4 TB7A-5 F402 125 mA 0453 .125 5 Vdc supply TB7-5 GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 17: Scc50 Fuses And Led Layout

    TB6-14 TB3-3 STATUS TB6-13 TB3-4 TB3-5 TB6-12 TB3-6 TB6-11 TB3-7 TB6-10 A B C D TB3-8 TB6-9 TB3-9 TB3-10 TB6-8 COM 1 TB3-11 TB6-7 TB3-12 TB6-6 TB6-5 TB6-4 F203 OK TB6-3 TB6-2 TB6-1 GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 18: Scc-50 Termination Wiring

    Page 18 SCC-50 Termination Wiring - GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 19: Old Model Scc-40 Termination Wiring

    N.B. The Compressor Run Signal (TB3 Terminal 11) must be supplied to the Controller from the Delta Contactor of a Star-Delta System, or the Top of Ramp of a Soft Start System. Xxx …xxx GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 20: Scc50-Auto Vi Stepper Motor Wiring

    Page 20 SCC50-Auto VI Stepper Motor wiring GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 21: Scc50 8-X Extension - Terminal Connections For Hazardous Area Panel

    DI 4 External Stop Compressor button Unit DI 5 External Start Compressor button DI 6 External Lower Capacity button (24vac) DI 7 External Raise Capacity button DI 8 spare C Add =7 Not available GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 22: Scc-50 Motor Monitor Temperature Signals

    Page 22 SCC-50 Motor Monitor Temperature Signals Analogue inputs type SWITCH range 0vdc signal 5vdc An IP 4 Motor Winding PT100 SW1-1=1 -50 to temperature 1 125°C An IP 3 Motor Winding PT100 SW1-2=1 -50 to temperature 2 125°C An IP 2...

  • Page 23: Operation

    Page 23 OPERATION SCC40 PANEL LAYOUT GUARDIAN SCC40 control panel comprises a membrane pushbutton and display panel mounted on the front of the control unit. The membrane front panel (shown below) has a black background with white lettering and green buttons with dimensions 300 x 200mm and houses:- Number, Capacity &...

  • Page 24: Led Lamps

    PRESSURE, TEMPERATURE, EQUIVALENT TEMPERATURE DIFFERENTIALS, HOURS RUN, TIMERS & SAFETY TRIPS ‘view’ 7 led lamps. Selection for 4-digit LED displays LATEST VALUE, SETPOINT, LOW ALARM, HIGH ALARM, LOW TRIP, HIGH TRIP & SYSTEM GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 25: System Status Displays

    SUCTION ==SE tUp= DISCHARGE FILTER ==== =YES “@ ” Press to enter system set-up mode accept Terminate passcode operation. SUCTION pASS code DISCHARGE FILTER ==== End= “@ ” Press to remove passcode accept GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 26 DISCHARGE FILTER PCEL HrLt Is displayed if relay is OFF Pump motor ON Compressor motor ON Economiser ON Liquid injection Oil heater ON Slide valve LOAD Slide valve UNLOAD Tripped relay ON GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 27 FILTER Abcd EfgH External OFF( lockoff ) Switch External MANUAL operation Switch External NORMAL operation Switch External Stop Compressor button External Start Compressor button External Lower Capacity button External Raise Capacity button spare GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 28 Discharge temperature high L.P. cutout H.P. cutout Oil level Oil flow switch Motor circuit breaker Emergency stop Safety (motor thermistor)/Flow switch 2 Analog output voltages.. SUCTION =AO1 =AO2 DISCHARGE FILTER 10.00 00.00 Output in volts GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 29: Safety Trip Indications

    'type' = TIMERS LED lamp. nnot Compressor motor running Trip SUCTION signal off. s-UP slide not at minimum Trip DISCHARGE punP pump running signal off Trip Accept and reset procedures are the same as for other trips. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 30: Display Pushbutton Operation

    -1.0b to 24.0b where b= bar gauge All temperatures are displayed in the range -50C to 125C where C= degrees centigrade LOAD% and CAPACITY% are 0% to 125% where % is of maximum scale. displayed in the range GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 31 If no buttons have been pressed for 5 minutes, the SUCTION, DISCHARGE, OIL and FILTER windows revert to the default display of latest pressure values with; 'view' = LATEST VALUE, 'type' = PRESSURE GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 32: Control Pushbutton Operation

    Operation in this mode is independent of any other compressors in the system. REMOTE automatic mode allows up to eight SCC-50 units to be connected via a two-wire communication link to provide 8-compressor system control. Any change to REMOTE mode whilst the compressor is running causes the compressor to automatically load up to 100% or assume suction pressure control if it is the only one in remote mode.

  • Page 33: Call Frig Engineer

    The 'raise' pushbutton is also used after 'next' has been pressed to increase the displayed values of setpoints, high, low, alarm and trip settings prior to changing them using 'accept'. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 34: Settings Change Pushbutton Operation

    If an attempt is made to change a setting using the incorrect passcode then the display defaults to:- 'view' = LATEST VALUE 'type' = PRESSURE “RESET” Exits setup mode without clearing passcode pressing ‘next’ again will flash value to be changed. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 35: Alarm Accept And Reset Pushbutton Operation

    The alarm value continues to alternate with 'Hi ' or ' Lo ' whilst an alarm is present. The tripped value continues to alternate with 'triP' until 'RESET' is pressed. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 36 TEMP heater slide % CAPACITY PRESS stop-load motor load % LOAD% PRESS start-unload Calc equiv-suct-temp SUCTION EQIV. superheat equiv-disc-temp DISCHARGE EQIV. superheat suct-superheat SUCTION DIFF diff-disc-pressure DISCHARGE DIFF diff-oil-pressure DIFF diff-filter-pressure FILTER DIFF GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 37: Setpoints

    DISCHARGE DIFFERENTIAL SETPOINT STOP PUMP When 'P-St' is selected, this is the differential discharge to suction pressure above which the pump is stopped if it is only required during compressor startup. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 38 The discharge temperature above which the pump is not allowed to start. CAPACITY PRESSURE LOW ALARM =MIN LOAD % The minimum slide % at which a Load sharing compressor is allowed before it automatically stops after the stage-down time. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 39: Control Modes

    Uses communications link to establish the most efficient loading of up to eight compressors on the same suction line. Multi-compressor loading can be selected to give priority in different ways:- a) runH uses Hours run on each compressor to determine which is best GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 40: Scc50 8-X External Control Panel Operation

    Raise Capacity buttons are operative SCC40 panel 'mode' button for OFF, Compressor, Capacity, Local, Remote is inoperative SCC40 panel control buttons Stop, Start, raise, lower are inoperative PC Communication for changes to mode and control is inoperative GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 41 'at min'. External Raise Capacity IF External MANUAL selected, behaves the same as SCC40 panel button 'raise' button. Otherwise inoperative. loads compressor if running and not 'at max'. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 42: Control

    Master. Once the control temperature/suction pressure goes above the control setpoint then the Master compressor will start. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 43: Starting

    If the oil diff is satisfied, ( diff is oil - suction), Motor is started. Once the motor is in the run state the pump is stopped. 8. If the motor running signal,(motor in delta), is not received within thirty seconds thecompressor will go to the tripped state 'nnot'/'trip'. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 44: Running

    Whilst the suction pressure is above the control band the Master continues to raise its slide. When the Master brings the suction pressure into or below the control band; then, provided it slide is less than Capacity Low Limit, GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 45 The master compressor will maintain suction pressure regulation. iii) Master compressor trips. If the load sharing compressor is not fully loaded it will be given highest priority, revert to suction pressure regulation mode and become Master. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 46: Stopping

    REMOTE mode then it will go into suction pressure regulation mode, begin requesting status information and become the master. If another compressor is already master, it will ramp its slide up to 100%. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 47: Two Speed Motor Control

    After the capacity load-delay (approx 3minutes), the capacity solenoid is loaded until at-minimum limit switch is removed. IF SYST 'noSP' is selected then the motor runs at maximum speed and no speed control takes place (standard slide control). GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 48 ='Compressor'. In manual mode the slide capacity may be increased/decreased using the raise and lower pushbuttons with mode selection = 'Capacity'. Local or remote operation may then be selected if required GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 49: Two Compressor-Single Motor Operation

    The facility for two SCC-40 controllers to be connected together in a Master-Slave configuration for applications where two compressors share a single motor will be shortly removed. It will be replaced at the next documentation issue with 2-Stage compressor control on the SCC50. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 50: Set-Up Of Auto Vi

    Howden and Dalian Refrigeration supply Auto VI Compressors with a stepper motor built into the Volumetric slide. Guardian SCC50 controllers now provide output signals for direct connection to drive the stepper motor as shown in SCC50 Auto VI Terminal Wiring on page xxx With the xx VI slide mechanical arrangement there are two modes of operation: 1.

  • Page 51: Procedure

    To resume Automatic VI, the Fixed VI parameter Fi Must be set to zero Fi=00. On SCC50 Restart Power-up, Compressor Stop or Compressor Trip then the VI slide is pulsed back to zero which takes about 2 minutes. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 52: Auto Vi Commissioning Parameters

    C255 This is normally defaulted for the Compressor type selected. However, this may vary depending on Howden configuration, so check with manufacturers data sheets. (See attached data sheet for Guardian defaults) Maximum Slide Stop U000 U255 This is normally defaulted for the Compressor type selected.
  • Page 53 Page 53 Guardian Default AVI Data for Howden Compressors. Compressor Compressor Capacity Slide Parked Initial VI Parked Model Type travel Stop position Setting(%) minimum maximum position (mm) (mm) (mm) (mm) XRV163/165 Ct 01 C150 In 70 XRV204/145 Ct 04 C152...

  • Page 54: Timer Setpoints

    ( <0.3 bar) the control setpoint. This delay is also used after starting motor before loading pulses are started. After-Stop LOAD % 1.0 to 5.0min the minimum time required after stop before allowing another restart. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 55 LOAD% WINDOW; This window displays three timers. 10.0 - 0.0min Time between starts - 1.0min Time after stop iii) Motor pre-load delay after When waiting the larger of i) and ii) is displayed. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 56: Setup

    COM2 Control Highway address of associated Unit Address SCC50 temperature Monitor unit. n = 1 - 8 If this unit is the SCC50 temperature monitor unit then this must be the same address GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 57 SCC40 panel. This requires an SCC50 8X extension unit to be fitted rhnn Real time clock Real time hours nn = 0 to 23 Cnnn Real time mins nn = 0 to 59 GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 58: System Settings

    Economiser back-off nn = 0 to 99 minutes retry time Stnn Motor start speed if nn = 0 to 99 % Inverter % Sinn Inverter speed nn = 1 to 20 % increment % GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 59 Refrigeration gas type Refrigeration gas type for superheat calculations YYYY=r22 404A yyyy Filter Differential Filter Position Relative To Pump YYYY=FStd Filter Standard (Filter After pump ) FdiS Filter Discharge (Filter Before Pump ) xxxxx GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 60: Analog

    The values are saved by pressing accept. Once accept has been pressed the values can also be edited with raise and lower. P=nn Pressure transducer P=04 4-20mA -1 to 24bar Guardian Transducer type P=05 4-20mA -1 to 20bar Danfoss Transducer tnnn Current transformer...

  • Page 61: Test

    LED 8 tOFF t=on Tripped relay Ao=0 Analog output calibartion Ao10 Ao05 Done SUCTION ==SE tUp= DISCHARGE FILTER ==== done Exit settings change and return to default compressor display “@ ”. press accept GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 62: Two Speed Motor Control Selection

    “@:@ ” raise lower DISCHARGE FILTER ==== 2-sp “@ ” “@ ” accept RESET Two speed motor operation has been selected. Two speed operation may be removed by selecting ‘none’ instead of ‘2-SP’ GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 63: Motor Temperature Monitor Setup

    ” accept next DISCHARGE FILTER ==== tn00 “@:@ ” “@:@ ” raise lower ==== tn03 ==== tn03 “@:@ “@ ” accept next DISCHARGE FILTER ==== =Pt= ==== A1oF “@ ” accept DISCHARGE FILTER GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 64: Motor Temperature Monitor Display & Alarm Limits

    Alarms and trip indications from the motor temperature monitor unit are automatically displayed in the Capacity and Load window with temperature indicator flashing. CAPACITY LOAD LOAD =t1== “@ ” accept =t2== “@ ” reset Any Motor monitor trips stop the compressor. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 65: Transducer Setup & Calibration

    To change any ‘Anal’ (Analog) setting use the following procedure; “@ ” “@ ” until correct value is displayed raise lower “@ ”. “@ ” accept next SUCTION ==sE tUP= DISCHARGE FILTER ==== donE “@ ” “@ ” accept RESET GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 66 4-20mA transducers are calibrated at the factory and should not need to be calibrated at site. Before attempting Pressure Calibration, please contact Guardian Electronics Ltd., Pressure transducers are set for a range of –1 to 24 Barg. (0-25 Bara) 4mA = -1 Barg, 17.44mA = 20 Barg,...
  • Page 67 IF a 300:5 current transformer is used then SEtuP-AnAL-tnnn = t300 press 'raise' or 'lower' until current transformer size is displayed then press 'accept'. press 'next' SUCTION ==SE tUP= DISCHARGE FILTER ==== t300 GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 68 'raise' or 'lower' until the required motor rating is displayed then press 'accept'. SUCTION ==SE tUP= DISCHARGE FILTER ==== r250 The load % zero and 100% settings can be marginally adjusted using 'view' SYTEM 'type' PRESSURE capacity above. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 69: Communications

    Communication commands and replies are now in Modbus Protocol and checked for parity and block length and automatically re-transmit if errors are detected. Each GUARDIAN controller has a unique unit number address A which is used to select the appropriate unit for interrogation or modification.

  • Page 70: Modbus Register Allocation

    See Alarm Format Motor run hours alarm status See Alarm Format Relay Output states See Relay Format Digital Input states See Input Format Extension Input states See Extension Format Scc50 Mode Selection See Mode Format GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 71: Modbus Format Types

    Bit2 = Input 3, (Normal operation) Bit3 = Input 4, (External Stop) Bit4 = Input 5, (External Start) Bit5 = Input 6, (External Raise) Bit6 = Input 7, (External Lower) Bit7 = Input 8, (not used) GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 72: Modbus System Settings Address

    Diff. Calc. = P4- P3 Fstd Filter Located after Pump P4 and before Oil Manifold P3 Fdis, Filter Discharge, Diff. Calc. = P2- P4 Filter Located after Discharge P2 and before Pump P4 GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 73: Control Highway Communications

    REMOTE AUTOMATIC page 39 and COMPRESSOR CONTROL OPERATION page 42. This control relies on inter-compressor RS485 communications on COM2 using a Guardian internal protocol. SCC50 controllers with Motor temperature Monitors also use this highway to request data transmission from the associated Motor temperature monitor unit.

  • Page 74: Control Highway Communication Wiring

    StPb iSPb Control pushbutton operation StPb- Standard SCC40 control panel pushbutton operation o ISPb Pushbutton operation with additional Intrinsically safe remote pushbuttons as well as SCC40 panel. rtc. Real Time Clock rh00 rh24 GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 75 Page 75 Real Time Clock mins rt00 rt59 GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 76 Force unload period during motor overload condition. Unload secs Fu05 Fu00 Fu20 output is closed for this period. Overload condition retry period. Sets the delay before loading mins rP0.5 rP0.0 rP9.9 can recommence after an overload condition. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 77 Capacity Slide limit switches fitted/Not fitted Li00 Li00 Li01 0=Fitted 1=Not fitted. Fixed Vi slide period. Time required to move Vi Slide from mins iP0.5 Ip0.0 Ip9.9 minimum to required position and from required position back to minimum. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 78 CU10.0. Pressure transducer type P 00 P255 P=04 4-20mA Guardian -1 to 24bar Transducer P=05 4-20mA Danfoss -1 to 20bar Transducer P=06 4-20mA Suction is -1 to 24bar Transducer, all others are -1 to 34bar Transducers. Load transformer current rating ratio ( txxx:5 )

  • Page 79: Setup / Commissioning Parameters

    No Action When Set to Zero 0% Restart after Starts/Hour timer SH LOAD PRESSURE LOW TRIP low-trip motor current 0.0b 20.0b SUCTION PRESSURE HIGH TRIP high-trip suction pressure DISCHARG PRESSURE HIGH TRIP 0.0b 23.0b high-trip discharge pressure GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 80: Temperatures

    20.0 FILTER EQUIV HIGH TRIP IF ‘rP5c’ Remote Pressure High Trip -1.0 24.0 rP5c set board links to LK01 OPEN, LK02 CLOSED rP5c Note Alarms and Trips have a delay of 60 seconds GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 81: Differentials

    2 ‘dt’ time commences only when OIL DIFF LOW TRIP is satisfied 3 IF Slide not returned to MIN Within dt time then Oil Drain Delay Commences for ‘SH’ Starts per Hour Timeout. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 82: Timers

    4-20mA transducers are calibrated at the factory and should not need to be calibrated at site. Before attempting Pressure Calibration, please contact Guardian Electronics Ltd., Pressure transducers are set for a range of –1 to 24 Barg. (0-25 Bara) 4mA = -1 Barg, 17.44mA = 20 Barg,...

  • Page 83: Settings Display And Change Facilities

    EQUIV TEMP DIFFERENTIAL HOURS RUN TIMERS (mins) SAFETY TRIPS ‘view’ HIGH ALARM ‘type’ SUCTION DISCHARGE FILTER CAPACITY% LOAD% PRESSURE stop-load start-unload TEMPERATURE mot.inh EQUIV TEMP DIFFERENTIAL HOURS RUN TIMERS (mins) SAFETY TRIPS GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...
  • Page 84 - A1 cal - A2 cal - A3 cal - A4 cal - A9 cal - A10 TEMPERATURE EQUIV TEMP DIFFERENTIAL HOURS RUN TIMERS (mins) SAFETY TRIPS SYSTEM STATUS & SETUP MODE GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 85: Scc-50 Enclosure Wiring: For Trips Negative

    Page 85 SCC-50 Enclosure wiring: for trips negative GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 86: Scc-50 Enclosure Wiring: For Trips Positive

    Page 86 SCC-50 Enclosure wiring: for trips positive. GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 87: Standard Wallbox Internal Wiring

    Page 87 Standard Wallbox Internal wiring GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 88: Standard Scc 40 Drawing

    Page 88 Standard SCC 40 Drawing GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 89: Fitting New Eprom

    Page 89 FITTING NEW EPROM NOTE POSITION BEFORE REMOVAL. ACTUAL LOCATION MAY BE REVERSED CORRECT POSITIONING OF EPROM ALIGN INDICATED INDENTS GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

  • Page 90: Index

    Connections for Hazardous Area Panel, Control Highway Communication Wiring, SCC-50 Motor Monitor Temperature CONTROL MODES, 40 Wiring, 22 CONTROL PUSHBUTTON OPERATION, SCC-50 Enclosure wiring: for trips negative, 86 Control status displays., 26 SCC-50 Enclosure wiring: for trips DISPLAY INDICATIONS, 24 positive., 87...
  • Page 91 Page 91 GUARDIAN SCC-50 Operator Manual Issue V1.0b 09/05/02...

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