After compressor stop the SSTV valve is kept closed for 60 seconds, not adjustable, and the
cooling fan will have a stop delay of 10 seconds. The stop delay for the cooling fan can be set
in the Timers/Motor fan/Run timer SP menu.
At shutdown the frequency converter is stopped immediately and the SSTV valve is closed im-
mediately.
Vi ratio regulation
Unisab IIIregulates the Vi ratio in three steps according to the actual pressure ratio. Before
switching from one Vi step to another, the actual Vi ratio for the compressor must have been
present for at least the time indicated in timer 34 Vi-pause (60 seconds). Otherwise, the
change of the Vi step will be cancelled.
Vi ratio .../Capacity/Vi ratio
Vi low range setting Vi high range setting Dig. output 12 (Vi)
1.9 2.6 Off
3.2 4.8 On
3.3.23 Oil charging, manual (screw compressors)
Oil cannot be charged when Unisab III is in Stopped mode. If the compressor is fitted with an
oil pump for oil charging, it can be started the following way: Select Setup/Timers/Oil Charg-
ing and the following picture appears:
Place the cursor on Run timer, press to enter the parameter change field, use and to
adjust the value and press to store the value.
Move the cursor to Start oil pump. Press
, select Yes with and press to store the val-
ue.
The pump will now start and run for the time set.
For SAB 202, SAB Mk3 and VMY Mk3 compressors a Watch the oil pressure alarm will be is-
sued while the oil pump is in manual operation for oil charging. If the pump should stop be-
fore time expiry, select No under Start oil pump.
Note: As from 2001 SAB 128/163 Mk3 and SAB 202 are no longer as standard fitted with a
valve for external connection to the oil pump suction side. It is therefore not possible to
charge oil with the unit oil pump.
Compressor control and surveillance
114/319
Engineering manual - Unisab III 1.10
001930 en 2014.09
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