JULABO Magnum 91 Temperature System - Manual (Page 59)

Temperature System Magnum 91
59
WARNING
CODE 43 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.
WARNING
CODE 44 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.
WARNING
CODE 45 The compressors of both stages are switched off due to wrong operation.
 The temperature control system 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..
ALARM
CODE 46 The compressor of stage 2 does not start.
 5 minutes after stage 1 is switched on, the pressure of stage 2 does not fall below
a determined value. Therefore stage 2 does not start.
Cancel the alarm state by turning the mains switch off (wait about 4 seconds) and
by turning the switch on again in order to restart the unit.
If the error reappears after switching the unit on again, the refrigerant circuit of
stage 1 needs to be checked by a specialist.
ALARM
CODE 47 The cooling system is surcharged, and the compressor of stage 2 was switched off.
 Before the WARNING CODE 42 is shown for more than two hours. In order to
avoid the destruction of the compressor, the refrigerant cycle of stage 2 should be
checked by a specialist.
ALARM
CODE 48 Caused by WARNING CODE 43 the compressor of stage 2 has switched off 5 times
within one hour.
 If after a certain time there was a pressure compensation, the alarm status can be
cancelled by switching off and on at the mains switch, and the unit is ready to
operate again.
In order to avoid the destruction of the compressor, the refrigerant circuit should
first be checked by a specialist.
ALARM
CODE 49 The pressure sensor of stage 2 (evaporation pressure, low pressure side) is
bypassed or has a line interruption.
 Have the repair done by a specialist.