CBMTQ Wiring

Trouble-shooting
53
Full heating power but no regulation
Full heating power but no regulation
No heating
No heating
CBMT/Qand
CV ..-..-.MQX / -.MQXL CV ..-..-.MQP / -.MQPLand
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Deactivate the limitation function (not valid for MQU/MQUL heaters), if it is activated, by making sure that
the jumpers ”MIN” and ”MAX” are open.
Strap/short-circuit the terminals for the main sensor.
Disconnect the control signal wiring and strap/short-circuit the control signal input terminals.●
If this results in the heating now being turned off, then the fault is in the external sensor circuitry.
If this results in the heating now being turned off, then the fault is in the external control signal.
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Check that the sensor is of the correct type and that its termination is made correctly.
Check that the correct function for the Pulser or TTC is selected.
Check the resistance of the sensor and the set value potentiometer. Disconnect them from the terminals before any
measurements is taken.
Sensors for 0...30°C should have the resistance 10k @ 30°C, 11.7k @ 20°C and 15k @ 0°C.
The external set value potentiometer should have the resistance 0...5k .
ΩΩ Ω
Ω
● Make sure that the control signal has the correct polarity.
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Check whether or not the overheating cut-out, with manual reset, has been activated. If it has, then eliminate
the fault and reset it. Read furthermore the paragraph ”Overheating” at page 10.
Check the overheating cut-outs and the heating elements by measurment.
Check whether or not there is mains voltage at the heater terminal blocks. Check the interlocking devices, fuses,
breakers, etc.
Disconnect the sensor from the terminals.
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Check whether or not the overheating cut-out, with manual reset, has been activated. If it has, then eliminate
the fault and reset it. Read furthermore the paragraph ”Overheating” at page 10.
Check the overheating cut-outs and the heating elements by measurment.
Check whether or not there is mains voltage at the heater terminal blocks. Check the interlocking devices, fuses,
breakers, etc.
Disconnect the control signal wiring and connect a 9V batteri-cell or another suitable voltage source as a control signal.
If the heater starts now, then the fault is in the external sensor circuitry. Otherwise, the fault is in the regulator
(Pulser/TTC).
If the heater doesn’t start now, then the fault is in the regulator (Pulser/TTC).
CBMT/Q Heater Kit