VEAB VFLPG Series, Manual

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Trouble-shooting
-MTEM / -MTEML
-MQEM / -MQEML
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The same procedure as above for the -MTEM / -MTEML type of heaters, but furthermore:
Check that the airflow through the heater is sufficient. The airflow is insufficient if the yellow LED on the PCB is light up, alternatively
the airflow might be sufficient but too turbulent for the electronics to sense the airflow correctly and then the yellow LED will remain
light up and the loss of heat will also remain. However, the airflow sensing device require a couple of minutes to heat itself after the
power supply has been switched on. During that period of time the yellow LED will remain light up, even though the airflow through
the heater is sufficient.
Full heating power but no regulation
No heating
-MTX / -MTXL (-MTY / -MTYL)
-MTC / -MTCL
-MTP / -MTPL
-MQX / -MQXL (-MQY / MQYL)
-MQC / -MQCL
-MQP / -MQPL
Disconnect the control signal wiring and strap/short-circuit the control signal input terminals.
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If this results in the heating now being turned off, then the fault is in the external control signal.
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Make sure that the control signal has the correct polarity.
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The same procedure as above for the -MTX / -MTXL / -MTY / -MTYL / -MTC / -MTCL / -MTP / -MTPL type of heaters, but furthermore:
Check that the airflow through the heater is sufficient. The airflow is insufficient if the yellow LED on the PCB is light up, alternatively
the airflow might be sufficient but too turbulent for the electronics to sense the airflow correctly and then the yellow LED will remain
light up and the loss of heat will also remain. However, the airflow sensing device require a couple of minutes to heat itself after the
power supply has been switched on. During that period of time the yellow LED will remain light up, even though the airflow through
the heater is sufficient.
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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 5.
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 battery-cell or another suitable voltage source as a control signal, if the type of
heater is -MTX / -MTXL / -MTY / -MTYL / -MTP / -MTPL .
If the type of heater is an -MTC / -MTCL a 470
resistor has to be connected in series with the 9V battery-cell to be used as a control signal.
Ω
If the heater doesn’t start now, then the fault is in the regulator (Pulser/TTC).
55
VFLPG / VFL / VTL
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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. k @ 20°C and 15k @ 0°C.
The external set value potentiometer should have the resistance 0...5k .
7
Ω Ω Ω
Ω
Full heating power but no regulation
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Deactivate the limitation function, if it is activated, by making sure that the jumpers ”MIN” and ”MAX” are open.
Strap/short-circuit the terminals for the main sensor.
If this results in the heating now being turned off, then the fault is in the external sensor circuitry.
No heating
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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 5.
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.
If the heater starts now, then the fault is in the external sensor circuitry. Otherwise, the fault is in the regulator (Pulser/TTC).