GEA Grasso - Page 121

Grasso
Refri
g
eration Division
GRASSO SYSTEM CONTROL
01.2003/0 638660E_chapter6.doc Kap.6 - 9
Display message / Explanation Possible cause of the alarm Alarm clearance
The suction gas overheat is too
low.
Remove cause of low suction gas
overheat in the refrigeration plant.
055 Alarm (01)
Suction gas
overheat too low
‘Suct dif temp’ limit is set too high. Change ‘Suct dif temp’ limit to a
suitable value.
‘dTo alarm dly’ time is set too
short.
Change ‘dTo alarm dly’ time to a
suitable value.
This alarm is activated if the suction
gas overheat falls below the ’Suct dif
temp’ limit value and the time delay
’dTo alarm dly’ has expired.
The configuration is incorrect. Check the parameter ‘Refrigerant’ and
‘Comp type’ in the configuration
menu.
The discharge temperature is too
high.
Remove cause of high discharge
temperature in the refrigeration plant.
056 Alarm (01)
Discharge
temperature
too high
‘Tdis hi alarm’ limit is set too low. Change ‘Tdis hi alarm’ limit to a
suitable value.
The sensor has not been correctly
calibrated in the configuration
menu.
Enter the correct calibration value.This alarm is activated if the
discharge temperature exceeds the
’Tdis hi alarm’ limit value.
The sensor is defective. Replace the sensor.
The suction pressure is too low. Remove cause of low suction pressure
in the refrigeration plant.
057 Alarm (01)
Suction
pressure
too low
‘Psuc low alarm’ limit is set too
high.
Change ‘Psuc low alarm’ limit to a
suitable value.
The sensor has not been correctly
calibrated in the configuration
menu.
Enter the correct calibration value.This alarm is activated if the suction
pressure falls below the ’Psuc low
alarm’ limit value.
The sensor is defective. Replace the sensor.
The suction pressure is too high. Remove cause of high suction pressure
in the refrigeration plant.
058 Alarm (01)
Suction
pressure
too high
‘Psuc hi alm n1/2’ limit is set too
low.
Change ‘Psuc hi alm n1/2’ limit to a
suitable value.
The sensor has not been correctly
calibrated in the configuration
menu.
Enter the correct calibration value.This alarm is activated if the suction
pressure exceeds the ’Psuc hi alm
n1/2’ limit value.
Note: the actual motor speed (n) is
of relevance for which limit is active.
The sensor is defective. Replace the sensor.
The terminal connections have
become loose or a wire is broken.
Check the terminal connections for
tightness and continuity of wiring.
059 Alarm (01)
Wire failure
suction pressure
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
pressure sensor.
The analogue input module
defective.
Replace the analogue input module.