5
Troubleshooting
Full heating power but no regulation
No heating
-MTEM
-MTEML
-PTEM
-PTEML
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Maintenance
Overheating
Strap/short-circuit the PCB terminals #15 and #18 (@ ≤40A), or #1 and #4 (@ >40A).
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If this results in the heating now being turned off, then the fault is in the external sensor circuitry.
If this doesn’t turn the heating off and no LED is lit up on the PCB, then there may be a short in a triac.
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Check that the sensor is of the correct type and that it is terminated correctly. (See p. 15-17 and 19-21).
Check that the correct function is selected for the controller (Pulser/TTC). (See p. 14 and 18).
Check the resistance of the sensor and the set value potentiometer.
Disconnect them from the terminals before any measurements are taken.
Sensors for 0...30°C should have a resistance of 10k
@ 30°C, 11. k
@ 20°C and 15k
@ 0°C.
The external set value potentiometer should have a resistance of 0...5k .
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Ω
Ω
Ω
7
Ω
Check that there is mains voltage at the heater supply terminals, and that the manual reset
overheating cut-out, has not tripped.
Check the interlocking devices, fuses, breakers, etc.
Disconnect the sensor from the terminals.
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If the heater starts now, then the fault is in the external sensor circuitry.
Otherwise, the fault is in the controller (Pulser/TTC).
If the manually reset cut-out has tripped, the following must be considered:
1. Switch the power supply off.
2. The lid of the heater may only be opened by qualified and authorized personnel.
3. Carefully investigate the cause of the tripping of the cut-out.
4. When the fault has been rectified, the overheating cut-out may be reset.
1. Normally, no maintenance is needed. A periodic function check, and re-tightening of the power
terminals, must be carried out at least once a year.
2. To maintain the insulation characteristics of the heating coils, they must be activated for 24h,
at least every 3 months.
VFLPG / VFL / VTL / VRA
-MTX
-MTXL
-PTX
-PTXL
-MTY
-MTYL
-PTY
-PTYL
-MTC
-MTCL
-PTC
-PTCL
-MTP
-MTPL
-PTP
-PTPL
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Full heating power but no regulation
No heating
Disconnect the control signal wiring and strap/short-circuit the control signal input terminals.
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Make sure that the control signal has the correct polarity.
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Check that there is mains voltage at the heater supply terminals, and that the manual reset overheating cut-out,
has not tripped.
Check the interlocking devices, fuses, breakers, etc.
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Disconnect the control signal wiring and connect a 9V battery-cell or another suitable voltage source as an
excitation signal, if the heater is meant for 0...10V / 2...10V / PWM.
If the heater is meant for 4...20mA a 470
resistor has to be connected in series with the 9V battery-cell
to be used as an excitation signal.
Ω
If the heater doesn’t start now, then the fault is in the regulator (Pulser/TTC).
If this results in the heating now being turned off, then the fault is in the exitation signal.
If this doesn’t turn the heating off and no LED is lit up on the PCB, then there may be a short in a triac.
