Message Possible cause Remedy
RD T ↑ Temperature in the refrigeration
dryer too high.
Ensure adequate ventilation.
Clean the refrigerant condenser.
Clean the cooler.
Install an extractor fan.
bearing.maint. h ↥ The maintenance interval for re-
greasing the bearings has expired.
Re-grease the motor bearings.
ext.load signal? Uncertain external load signal:
The high cut-out pressure was ex‐
ceeded.
The external load control has not
switched to idle (off load).
Check settings of the external controller.
Take into account pressure drops across fil‐
ters and dryer.
air filter dp ↑ Air filter clogged. Carry out air filter maintenance
air filter dp ↥ Air filter clogged. Carry out air filter maintenance
air filter h ↥ Maintenance interval for air filter
check has elapsed.
Check the air filter.
modem problem SIGMA CONTROL does not rec‐
ognise the modem.
Check the link between SIGMA CONTROL
and the modem.
motor T ↑ Drive motor overheating. Clean the motor.
Keep ambient conditions within specified
limits.
motor bearings Drive motor bearing defective. Call authorized KAESER Service represen‐
tative.
motor starts /h ↥ The permissible number of motor
starts was exceeded in the last
60 minutes.
Extend the idle period.
Increase the capacity of air receiver.
Increase the cross-section of piping be‐
tween compressor and air receiver.
motor starts /d ↥ The permissible number of motor
starts was exceeded in the last
24 hours.
Extend the idle period.
Increase the capacity of air receiver.
Increase the cross-section of piping be‐
tween compressor and air receiver.
bearingchange h ↥ The maintenance interval for
checking the motor bearings has
expired.
Have the motor bearings checked by an au‐
thorized KAESER Service Technician.
system press. ↓ Network pressure has fallen below
the set 'low' value.
Air consumption too high.
Check air demand.
Check cable runs and sensor connections.
Check the 'sys.press. low' warning setting.
system press. ↑ Network pressure is above the
"sys.press. high" value.
Check for air leaks.
Check the 'sys.press. high' warning setting.
Check whether the machine switches to
LOAD.
mains voltage ↓ 1. Power supply failure:
Machine was re-started automati‐
cally.
Check power supply.
Check the door interlock switch.
9 Fault Recognition and Rectification
9.3 Warning messages (yellow LED lights)
56
Service Manual Screw Compressor
ASD T Tri-Voltage 9_5721 06 USE
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