GEA Grasso, Manual

Page: 120 / 166

Grasso
Refrigeration Division
GRASSO SYSTEM CONTROL
Kap.6 - 8 638660E_chapter6.doc 01.2003/0
Display message / Explanation Possible cause of the alarm Alarm clearance
The oil differential pressure is too
low. Remove cause of low oil differential
pressure at the compressor.
050 Alarm (01)
Oil differential
pressure too low
‘dPoil low alarm’ limit is set too
high. Change ‘dPoil low alarm’ limit to a
suitable value.
This alarm is activated if the oil
difference between the oil pressure
and crankcase pressure or suction
pressure (only if no crankcase
pressure is available) is less than the
’dPoil low alarm’ limit value and the
time delay ’Oil dif start’ and/or ’Oil
dif run’ has expired. ‘Oil dif start’ and/or ‘Oil dif run’
time is set too short. Change ‘Oil dif start’ and ‘Oil dif run’
times to suitable values.
The differential pressure is too
high. Remove cause of high differential
pressure in the refrigeration plant.
051 Alarm (01)
Differential
(Psuc and Pdis)
pressure too high
The configuration is incorrect. Check the parameter ‘Refrigerant’ and
‘Comp type’ in the configuration
menu.
This alarm is activated if the
calculated differential pressure
exceeds the fixed limit for the
selected compressor type.
The pressure ratio is too high. Remove cause of high differential
pressure in the refrigeration plant.
052 Alarm (01)
Pressure ratio
(Psuc and Pdis)
too high
The configuration is incorrect. Check the parameter ‘Refrigerant’ and
‘Comp type’ in the configuration
menu.
This alarm is activated if the pressure
ratio exceeds the fixed limit for the
selected compressor type.
The suction temperature is too low. Remove cause of high differential
pressure in the refrigeration plant.
053 Alarm (01)
Suction temperature
too low
The sensor has not been correctly
calibrated in the configuration
menu. Enter the correct calibration value.
The sensor is defective. Replace the sensor. This alarm is activated if the suction
temperature falls below the fixed
limit for minimum suction
temperature.
The terminal connections have
become loose or a wire is broken. Check the terminal connections for
tightness and continuity of wiring.
054 Alarm (01)
Wire failure
suction temperature
There is a short circuit in the sensor
wiring. Check where the short circuit has
occured and rectify.
The sensor is defective. Replace the sensor. The GSC has detected a loose wire
or short circuit in the suction
temperature sensor.
The analogue input module
defective. Replace the analogue input module.