![background image](http://html1.mh-extra.com/html/veab-heat-tech/cv-series/cv-series_fitting-instructions-manual_3706951145.webp)
Trouble-shooting
53
Full heating power but no regulation
Full heating power but no regulation
No heating
No heating
CV ..-..-.MQEM / -.MQEML
CV ..-..-.MQU / -.MQUL
and
CV ..-..-.MQX / -.MQXL
CV ..-..-.MQP / -.MQPL
and
●
●
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.
●
●
●
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 .
Ω
Ω
Ω
Ω
●
Make sure that the control signal has the correct polarity.
●
●
●
●
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.
●
●
●
●
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).
CV
Summary of Contents for CV Series
Page 21: ...CV E MTEM R 21...
Page 23: ...CV E MTEM R 23...
Page 35: ...CV E MTEM R 35...
Page 39: ...CV E MTEM R 39 RU CV E R...
Page 62: ...CV M MTU MTX MTP 22...
Page 67: ...CV M MTU MTX MTP 27 CV 1MTUL 230V...
Page 88: ...CV M MTU MTX MTP 48 RU CV M...
Page 89: ...CV M MTU MTX MTP 49...
Page 90: ...CV M MTU MTX MTP 50...
Page 91: ...CV M MTU MTX MTP 51...
Page 116: ...24 CV...
Page 126: ...34 CV...
Page 139: ...47 CV...
Page 151: ...59 CV...
Page 183: ...31 CV...
Page 187: ...35 CV...
Page 191: ...39 CV...
Page 198: ...46 CV...
Page 199: ...47 CV...