Cryo-Compact Circulators
67
Difference between
working- and safety-
temp. Bigger than
permissible value.
• Defect of the working or excess temperature sensor.
Working temperature and excess temperature sensors report a
temperature difference of more than 35 K.
The internal I2C
bus-system
shows
a failure.
• Other errors (I
2
C-BUS errors)
Error in A/D-
converter of the
internal measuring
system.
Working temperature
exceeds
the adjusted
safety temperature.
• Excess temperature sensors defect.
• The excess temperature value lies below the working temperature
setpoint. Set the excess temperature to a higher value.
External control
selected, but ext.
sensor not connected
or defective.
• External control selected, but external Pt100 sensor not connected
Cooling is affected
or ambient temperature
to high
Clean condenser
• Cooling of the condenser is affected. Clean air-cooled condenser.
Check the flow rate and cooling water temperature on water-cooled
condenser.
• Compressor does not work.
After a short cooling interval, the compressor motor will be
automatically reconnected and the message "CODE 21" no longer
appears.
Internal safety-
temperature sensor
short-circuited or
interrupted.
• Cable of the excess temperature sensor interrupted or short-circuited
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