Engineering manual - UniSAB III 1.10.8
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001930 en 2021.06
Set-up
23. F. F. Pump start
In case the motor guard of the full flow pump/Cooling FAN has failed to issue a feedback within the sta-
ted time after the starting signal, an error message will appear.
24. Oil pump start
In case the motor guard of the oil pump has failed to issue a feedback within the stated time after the
starting signal, an error message will appear.
25. Oil rectifier start
Whenever the compressor starts, this timer will be activated and start counting down. When 0 has been
reached, the solenoid valve to the oil rectifier will be activated.
26. Oil rectifier delay
If suction gas superheating drops below set point 1 for superheating, the solenoid valve will close. Once
the superheating rises above this limit again, the timer must expire before the solenoid valve opens.
27. Oil rectifier disable
If suction gas superheating drops below set point 1 for superheating, the timer will start counting down.
Provided the superheating still remains below the limit once the timer has reached 0, an alarm will be
issued.
28. Start high pressure
On two-stage plants the HP compressors can be started by force by activating the input External starting
permission, normal stop. The start will be delayed for the set number of seconds.
With the compressors in sequence, number 1 in the sequence will start and the system will now operate
normally.
29. Not used
30. Cap. negative
When the compressor is started, the slide must move to the position corresponding to the set zero point
(i.e. positive read capacity) as quickly as possible before the expiry of the cap. negative timer. Otherwise
an error message will be issued. The cap. negative timer counts down each second by the value:
Corrected capacity is shown in the display when the compressor is started. It may be a negative value
between 0 and -30%, i.e. the timer will count down each second by a factor between 1 and 90. Each time
the slide moves above 0% capacity, the timer will stop. The timer is reset and restarted as soon as the
slide moves below -2% corrected capacity.
31. Unloaded start
The timer is used in connection with the compressors FV 17/19. When the compressor motor is started,
a by-pass solenoid valve for oil discharge will open for the time set.
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