Emerson VSG & VSSG, Software Manual

Page: 24 / 86

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Compressor Alarm and Trip
· Low Suction Pressure Setpoints 1&2 – This is
the low suction pressure safety. This safety is
active in both temperature and pressure control
modes. An alarm or trip will be active on a drop
in suction pressure below the setpoint value.
· High Discharge Pressure Setpoints 1&2 This is
the high discharge pressure safety. The alarm or
trip will be active on a rise in discharge pressure
above the setpoint value.
· Low Suction Temperature – This is the lowest
allowable Suction temperature. The compres-
sor will not be allowed to run if the Suction
Temperature is below the trip setting.
· High Discharge Temperature – This is the high
discharge temperature safety. The alarm or
trip will be active if the discharge temperature
should rise above the setpoint value.
· Low Oil Separator Start Temperature – This is the
starting low oil separator temperature safety.
The compressor is prevented from starting or
running if the oil in the separator is below the
trip value. After a time delay (Oil Separator
Temperature Safety Changeover), this safety is
deactivated and the Lo Oil Separator Run Tem-
perature is the active setpoint.
· Low Oil Separator Run Temperature – This is the
running low oil separator temperature safety.
After a time delay (Oil Separator Temperature
Safety Changeover), the Lo Oil Separator Start
Temperature is bypassed and Lo Oil Separator
Run Temperature is the active setpoint. The
alarm or trip will be active if the oil temperature
of the separator drops below the setpoint value.
· Low Oil Injection Temperature – This is the low
oil injection safety. The alarm or trip will be
active if oil injection temperature drops below
setpoint value after a time delay (Oil Injection
Temperature Safety Changeover).
· High Oil Injection Temperature – This is the high
oil injection temperature safety. The alarm or
trip will be active on a rise in oil injection tem-
perature above the setpoint value.