GEA Grasso Manual page 119

Grasso
Refrigeration Division
Display message / Explanation
025 Alarm
External temperature
too low
This alarm is activated if the external
temperature falls below the 'Text
low alarm' limit value.
030 Alarm
MPI / Profibus-DP
network comm.
failure
This alarm is activated at the slave
GSC if an operation mode has been
activated, where data exchange via
MPI or Profibus-DP is activated, and
the slave GSC is not connected to
the master.
031 Alarm
PLC power supply
interrupted
This alarm is activated if the PLC
power supply has been interrupted.
032 Alarm
Refrigerant data
not found. Please
select other refr.
This alarm is activated if during the
configuration a refrigerant has been
selected that is not available on the
EPROM.
049 Alarm (01)
Wire failure
crankcase pressure
The GSC has detected a loose wire
or short circuit in the crankcase
pressure sensor.
01.2003/0
Possible cause of the alarm
The external temperature is too
low.
'Text low alarm' limit is set too
high.
The sensor has not been correctly
calibrated in the configuration
menu.
The sensor is defective.
MPI / Profibus-DP cable broken or
plug-in connector defective.
The master PLC operation mode
state is 'STOP'.
The 'Life-bit' of the slave is not
returned by the master.
Wrong selection of the 'Netw fault'
parameter in the operating mode
menu.
The terminal connections have
become loose or a wire is broken.
Wrong selection of the 'Power
return' parameter in the operating
mode menu.
The configuration is invalid.
The selected refrigerant is not
available on the EPROM.
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.
638660E_chapter6.doc
GRASSO SYSTEM CONTROL
Alarm clearance
Remove cause of low external
temperature in the refrigeration plant.
Change 'Text low alarm' limit to a
suitable value.
Enter the correct calibration value.
Replace the sensor.
Replace the defective parts.
Change the PLC operation mode into
'RUN'.
Check the master PLC program.
Select the correct setting for the
'Netw fault' parameter.
Check the terminal connections for
tightness and continuity of wiring.
Select the correct setting for the
'Power return' parameter.
Check the parameter 'Refrigerant' in
the configuration menu.
If the correct refrigerant has been
selected and this alarm occurs, where
the PLC shows no other failures, the
EPROM has to be exchanged.
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.
Kap.6 - 7