JULABO Magnum 91 Temperature System - Manual (Page 71)

Temperature System Magnum 91
71
Error messages Description
-29 COMPRESSOR STAGE 1 FIVE
TIMES PER DAY IN OVERTEMP
The exit temperature of stage 1 is too high. For this reason the
compressors of both stages have already been switched off 4
times.
(see warning CODE 28).
After a cool-down phase the alarm status can be cancelled by
switching off and on again at the mains switch, and the unit is
ready to operate again.
In order to avoid the destruction of the compressor, the refrigerant
cycle of 1
st stage should be checked by a specialist first.
-30 COMPRESSOR STAGE 1 FAILURE
IN TEMPERATURE MEASUREMENT
SYSTEM
The temperature sensor for the exit temperature of stage 1 is
bypassed, or there is a line interruption.
Have the repair done by a specialist. .
-42 WARNING:
COMPRESSOR STAGE 2 ABOVE
HIGH PRESSURE
Already for a period of 5 minutes the pressure in stage 2 (high
pressure side) is too high. The cooling system works at its limit. If
the pressure falls below a factory-made value for at least 100
seconds, the warning expires again.
-43 WARNING:
COMPRESSOR STAGE 2
OVERPRESSURE SWITCH HIGH
PRESSURE SIDE
The compressor of stage 2 was switched off.
 The high pressure controller in stage 2 (high pressure side at
approx. 24 bar) measures an excessive pressure. As soon as
the pressure reaches the switching point, the compressor is
switched on again and the warning disappears.
 The motor winding protection in stage 2 measures an
excessive temperature.
As soon as the temperature in stage 2 reaches the lower
switching point, the compressor is switched on again and the
warning disappears.
-44 WARNING:
COMPRESSOR STAGE 2
OVERPRESSURE SWITCH LOW
PRESSURE SIDE
The compressor of stage 2 was switched off.
The high pressure controller T0 in stage 2 (low pressure side at
approx. 7 bar up to 9,5 bar) measures a too high pressure. As
soon as the pressure reaches the lower switching point again, the
compressor is switched on, and the warning expires again.
-45 WARNING:
TO OFTEN SWITCH ON/OFF
DEVICE BY USER, PLEASE WAIT,
DEVICE START AUTOMATICALLY
The compressors of both stages are switched off due to wrong
operation.
The temperature control system LH85 was switched too often by
the operating personnel with the key Start/Stop . The
allowed switching frequency of the compressors (5 times per
hour). is exceeded. Until the end of the hour the WARNING CODE
45 is shown.
Attention:
If the last key command was a „Start“, the compressors are
switched on again delayed after this hour. If this is not required,
switch off and on again the unit at the mains switch..