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Table of Contents
Summary of Contents for SABROE UNISAB S-Control
- Page 2 0171-761-EN 94.06 Compressor type: Shop no.: Refrigerant: UNISAB Version no.: Instruction manual UNISAB S-Control Computerized control system for screw compressors...
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Page 3: Preface
UNISAB are not relevant. Warning If it proves necessary to service the UNISAB S-Control system, the power supply to the compres- sor motor must be switched off at the main switch to prevent the compressor from being started accidentally. -
Page 4: Table Of Contents
............Description of UNISAB S-Control . - Page 5 0661-903 Settings for UNISAB S-Control ........
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Page 6: Description Of Unisab S-Control
PROSAB II can be inter-connected to form an integrated system which ensures values you have set, or those set by that the refrigeration plant operates opti- SABROE - - even if the power supply is cut mally. off. °... - Page 7 0171-761-EN Pos. 1 shows a four-digit display. displayed, depending on which LED is lit. The following tem- Pos. 2 LEDs are used to indicate the perature and pressure values can value unit in the display and be displayed: whether the compressor is regu- lated manually or automatical- Column a: Low alarm limit Column b: Actual operating...
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Page 8: Operating The Unisab S-Control
· When the UNISAB S-Control is sup- as shown in the wiring diagram. plied, alarm limits will have been coded in by SABROE, as stated in the table in · Check to ensure that the UNISAB the section entitled Factory setting of S-Control is correctly coded for the vol- alarm limits. -
Page 9: Operator Panel
, ¯ and func- in the LED field marked in automatic mode. A steady light indi- tion as follows: cates that the UNISAB S-Control is ope- indicates the measuring point whose cur- rating in manual mode. rent measuring value is displayed . - Page 10 0171-761-EN The keyboard must be used to move the sig- Oil flow nal to another LED - - please refer to pos. 4 Motor feedback Keyboard. Suction pressure ramp function Slide max. The values should be interpreted as follows: Delay before start SUCTION PRESSURE is the pressure of Delay before stop the refrigerant on the suction side of the...
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Page 11: Pos. 4. Keyboard
0171-761-EN The values Control, Nz and P. Band are used The keys are used as follows: to regulate the compressor capacity, and are used to move from one should be interpreted as follows: column to another in the LED · Control is used to change the UNISAB field (pos 3). -
Page 12: Basic Operation
0171-761-EN Basic operation UNISAB S-Control is easy to operate, as the following example clearly shows. ° ° C sat UNISAB S-CONTROL Suction Pressure (SP) Discharge Pressure Diff.Pressure Timer No. Time SP Capacity ¯ Superheat Capacity Discharge Temperature Vi Control... -
Page 13: Changing Parameters
· Likewise, pressing the key reduces values are called parameters. All parameters the value of the flashing digit. are preset by SABROE before the UNISAB · Then press the key to move to the S-Control leaves the factory. If you wish to next digit. -
Page 14: Alarm/Warning Functions
0171-761-EN Alarm/warning functions Alarms When an alarm limit is exceeded the com- · At automatic reset the compressor can pressor stops. The relevant LED will flash restart when the actual value is again within the warning limit (i.e. it is not quickly and the alarm relay will change to alarm position. -
Page 15: Low And High Alarm Limit Settings
0171-761-EN Low and high alarm limit settings The following table indicates the permitted limit settings for low and high alarms. (White fields). High Low alarm High alarm warning warning Limit for Factory (Add to low (Subtract from Factory Limit setting setting alarm) high alarm) -
Page 16: Factory Settings For Alarm Limits
If you have coded in new limits, it is pos- alarm is delayed 300 seconds after start- sible to revert to the alarm limits originally set by SABROE. This is done by using the · At the high alarm limit, the oil filter configuration function. Please refer to the differential pressure alarm is delayed 20 seconds. -
Page 17: Warning Limits
0171-761-EN Warning limits: UNISAB S-Control also has warning limits Provided normal conditions are resumed, which cannot be changed. However all war- the flashing light will stop and nothing more ning limits are linked to the alarm limits, so will happen. -
Page 18: Configuration
· Discharge pressure reading. key depressed while you reconnect po- · Oil pressure reading. wer to the UNISAB S-Control. These fields show a figure between 0 and · The LED beside the column for suction 255 which relates to the measured pres- pressure will now be lit and the P.Band... - Page 19 The value must be entered in tens of 0. No /h and is displayed as such. 1. Yes UNISAB S-Control selects a standard 5. Booster operation. value for the compressor based on fe- 0. No male drive. Always check that this 1.
- Page 20 (parameter 13 = 0), UNISAB S-Control is long, the stated or between two limit values for high temperature will be too high, because the motor current (parameter 13 = 1).
- Page 21 Switch off the power supply to the · changed. UNISAB S-Control. This operation affects: Switch on the power supply again. The · · Alarm and warning limits UNISAB S-Control is now ready in oper- · Timer set points ation mode.
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Page 22: Various Functions
(see the wiring dia- after start-up. gram) via a potential-free switch. If this switch is not activated within 600 If the UNISAB S-Control does not receive seconds after prelubrication begins, the feed-back within 15 seconds from giving alarm will be activated. -
Page 23: Economizer
0171-761-EN Auxiliary output in when the discharge gas temperature from the compressor exceeds the preset value. It During configuration, one of the following is coupled out when the temperature falls functions may be selected (output available 5°C below the preset value. on terminals 12-13): 0: Warning output which is activated Economizer... -
Page 24: Service And Calibration
· Press the key to calibrate the · Bring the UNISAB S-Control into con- transducer. figuration mode. · Continue to the next value and repeat the · Wait 10 - 15 seconds to allow all the process. -
Page 25: Measuring The Motor Current
0171-761-EN Measuring the motor current UNISAB S-Control has a 0-20 mA input for For the example shown, type a value of measuring the motor current when con- “200” in the display. The scaling is imple- verted. mented once this has been done and the pro-... -
Page 26: Timers
0171-761-EN Timers While the UNISAB S-Control is waiting for fields, you pass on to the next timer. Anoth- a timer to expire, the middle LED in the er way of doing this is to select the field Timer field will flash. -
Page 27: Description
1 Start/start 8 Delay before start Specifies the number of seconds that When the UNISAB S-Control is in auto- must elapse from when the compressor matic mode, start-up of the compressor has been started to when it can be started will be delayed by the indicated number again. -
Page 28: Regulating And Limiting Functions
Capacity Slide Position Oil Pump Control NZ P. Band Comp. Motor This indicates that manual operation has UNISAB S-Control has built-in suction pressure regulation and brine temperature been selected. regulation, which automatically regulate the · Press the key repeatedly until the compressor capacity. -
Page 29: Oil Pump
Automatic Control. key. Pressing the key stops the compress- If the UNISAB S-Control is not inter- connected with other UNISAB or PRO- SAB II, and is not being controlled re- The limiting functions, (please refer to the... -
Page 30: Setting Regulator Parameters
9 are dis- played like this: Setting regulator parameters 10 = A UNISAB S-Control regulates the compress- 11 = B or capacity on the basis of the suction pres- 12 = C sure or the brine temperature. -
Page 31: Settings
0171-761-EN to change the NZ of the suction pressure the brine temperature regulator. regulator without changing the NZ for quickest up slowest up P.band P.band Deviation slowest down quickest down Settings The settings mentioned must be within the limits stated in the following table. You can use the actual column to note the actual set- tings. -
Page 32: Limiting Functions
3. High motor current cannot be changed if the consequence of If the UNISAB S-Control is equipped with a this change is an excess of the limiting signal for measuring the motor current functions. -
Page 33: Delayed Restart Function
Time LED will flash. During periods 1 and 2, the LED in the Time · When the UNISAB S-Control is deli- field will flash to indicate that it is not pos- vered, the inputs are shorted, as shown in... - Page 34 0171-761-EN which ensures that the volume ratio is opti- on the pressure conditions over the com- mal. This can be seen in the LEDs for ca- pressor. When the V slide is in max. posi- pacity and ¯, while the capacity slide po- tion, the LED beside V control will light sition indicator displays 100%.
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Page 35: Multisab Sequential Regulation Of Screw Compressors
Please refer to the chapter Each UNISAB S-Control or PROSAB II is entitled Changing parameters. This position inter-connected with a 2-core screened cable is defined by means of a start sequence - - please refer to instruction no. -
Page 36: Local Automatics
UNISAB S-Control with the lowest com- pressor no is switched off, the regulator on If the capacity requirement increases, each the UNISAB S-Control with the next larger compressor will increase capacity to 100% no. is used, and it is unpractical if it has a before the next compressor starts. -
Page 37: Replacing Parts
We would not recommend that At delivery, the blue label on the inside of you repair this section - - replace the the UNISAB S-Control cover will indicate complete cover with a new unit in agree- the value for each pressure transducer. - Page 38 · Repeat the procedure for discharge and · Switch off the power supply to the oil pressures. UNISAB S-Control. Switch it on again right away and the UNISAB S-Control · Repeat the procedure for temperature in- will be ready to operate.
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Page 39: Trouble-Shooting
Please note the fol- the terminals may still be live. lowing before trying to trace a fault.: · Cut out the compressor motor starter to · UNISAB S-Control contains live parts prevent accidental start. Fault Possible causes... - Page 40 0171-761-EN Fault Possible causes Display shows - - The UNISAB S-Control has not been reset to factory settings. “Err” - - The compressor type is set to 0. - - The refrigerant is set to 0. Refer to the chapter entitled Configuration.
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Page 41: Appendix
0171-761-EN Appendix Setting of pressure and temperature warning limits for screw compressors Suction pressure: - SAB 110, SAB 128 Mk2 and SAB 163 Mk2: Set low alarm to stop the compressor 8K lower than the evaporating temperature. Set Set low alarm to stop the compressor at a low warning 3 K lower than the evaporating differential pressure of 0 bar. -
Page 42: Actual Warning And Alarm Limits
Actual warning and alarm limits Low warning always 5 K If you have changed the warning and alarm higher than low alarm. limits set by SABROE Refrigeration, use Oil temperature: the following table to record the new set- Set high alarm acc. to table: tings.