Johnson Controls SABROE Unisab III Control, Engineering Manual

Page: 250 / 348

Engineering manual - UniSAB III 1.10.8
250/346
001930 en 2021.06
Set-up
21. Motor start
When the compressor starts, the motor guard must issue a feedback before the timer expires. If not, an
error message will appear.
22. PMS (Starting request) feedback
After the control has issued a starting request, it must receive a feedback within the stated time. If not,
an error message will appear.
23. Oil cooling on
At compressor stop the outlet for water cooling or oil cooling will not close until after the set time has run
out.
24. Oil return
At compressor start the outlets for oil return are not opened until after the set time has run out.
25. Oil rectifier start
Whenever the compressor starts, the 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 the 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. Not used
31. Not used
32. Low suction pressure
During start-up and operation the shutdown for low suction pressure is delayed for the indicated period
of time.