GEA Grasso, Manual

Page: 124 / 166

Grasso
Refrigeration Division
GRASSO SYSTEM CONTROL
Kap.6 - 12 638660E_chapter6.doc 01.2003/0
Display message / Explanation Possible cause of the alarm Alarm clearance
The emergency stop button has
been pressed. Reset the emergency stop button.
070 Alarm (01)
Emergency stop
or HP-switsch active
The high pressure switch on the
discharge side has been activated. Reset the discharge pressure switsch.
The terminal connections have
become loose or a wire is broken. Check the terminal connections for
tightness and continuity of wiring. This alarm is activated if the input
E 0.2 ’External safety’ equals 0.
The digital input module defective. Replace the digital input module.
Time setting ‘Motor feedback’ too
short. Increase the time setting ‘Motor
feedback’ to a suitable value.
071 Alarm (01)
Motor feedback
too late
The feedback contactor is defective
— open contact. Replace the feedback contactor.
Power failure due to tripped fuse. Change fuse.
The terminal connections have
become loose or a wire is broken. Check the terminal connections for
tightness and continuity of wiring.
This alarm is activated if the
feedback signal (digital input E 0.0
equals 1) from the compressor drive
motor starter equipment takes
longer than the ’Motor feedback’
time setting.
The digital input module defective. Replace the digital input module.
The motor protection device has
been activated. Reset the motor protection device.
072 Alarm (01)
Motor protection
device active
The terminal connections have
become loose or a wire is broken. Check the terminal connections for
tightness and continuity of wiring.
The digital input module defective. Replace the digital input module. This alarm is activated if the
compressor is running and the digital
input signal E 0.1 ’Motor protection’
equals 0.
The terminal connections have
become loose or a wire is broken. Check the terminal connections for
tightness and continuity of wiring.
073 Alarm (01)
Wire failure
discharge
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 discharge
temperature sensor.
The analogue input module
defective. Replace the analogue input module.
The intermediate temperature on
the low pressure side is too high. Remove cause of high intermediate
temperature in the refrigeration plant.
074 Alarm (01)
Intermediate
temperature LP
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
intermediate temperature LP
exceeds the ’Tdis hi alarm’ limit
value.
The sensor is defective. Replace the sensor.