GEA Grasso Manual page 125

Grasso
Refrigeration Division
Display message / Explanation
075 Alarm (01)
Wire failure
intermediate
temperature LP
The GSC has detected a loose wire
or short circuit in the intermediate
temperature LP sensor.
076 Alarm (01)
Wire failure
intermediate
temperature HP
The GSC has detected a loose wire
or short circuit in the intermediate
temperature HP sensor.
077 Alarm (01)
Intermediate gas
overheat too low
This alarm is activated if the
intermediate gas overheat falls
below the 'Intm dif temp' limit value
and the time delay 'dTo alarm dly'
has expired.
078 Alarm (01)
Oil temperature
too low
This alarm is activated if the oil
temperature falls below the 'Toil low
alarm' limit value.
079 Alarm (01)
Oil temperature
too high
This alarm is activated if the oil
temperature exceeds the 'Toil hi
alarm' limit value.
01.2003/0
Possible cause of the alarm
The terminal connections have
become loose or a wire is broken.
There is a short circuit in the sensor
wiring.
The sensor is defective.
The analogue input module
defective.
The terminal connections have
become loose or a wire is broken.
There is a short circuit in the sensor
wiring.
The sensor is defective.
The analogue input module
defective.
The intermediate gas overheat is
too low.
'Intm dif temp' limit is set too high. Change 'Intm dif temp' limit to a
'dTm alarm dly' time is set too
short.
The configuration is incorrect.
The oil temperature is too low.
'Toil low alarm' limit is set too high. Change 'Toil low alarm' limit to a
The sensor has not been correctly
calibrated in the configuration
menu.
The sensor is defective.
The oil temperature is too high.
'Toil hi alarm' limit is set too low.
The sensor has not been correctly
calibrated in the configuration
menu.
The sensor is defective.
638660E_chapter6.doc
GRASSO SYSTEM CONTROL
Alarm clearance
Check the terminal connections for
tightness and continuity of wiring.
Check where the short circuit has
occured and rectify.
Replace the sensor.
Replace the analogue input module.
Check the terminal connections for
tightness and continuity of wiring.
Check where the short circuit has
occured and rectify.
Replace the sensor.
Replace the analogue input module.
Remove cause of low intermediate gas
overheat in the refrigeration plant.
suitable value.
Change 'dTm alarm dly' time to a
suitable value.
Check the parameter 'Refrigerant',
'Comp type' and 'ECO system' in the
configuration menu.
Remove cause of low oil temperature
in the refrigeration plant.
suitable value.
Enter the correct calibration value.
Replace the sensor.
Remove cause of high oil temperature
in the refrigeration plant.
Change 'Toil hi alarm' limit to a
suitable value.
Enter the correct calibration value.
Replace the sensor.
Kap.6 - 13