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 cool 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 Exter-
nal 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. No chiller
When Unisab III is configured as part of a chiller control, this timer will ensure that the com-
munication between Unisab III and the connected chiller does not disappear for a period lon-
ger than the set time. If this occurs, both Unisab III and Unisab III-Chiller will be stopped by
the shutdown.
Set-up
Engineering manual - Unisab III 1.10
001930 en 2014.09
227/319
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