10
VFLPG/VFL/VTL/VRA
Trouble-shooting
- MQEM / -MQEML
• The air flow sensor needs to warm up for a couple of minutes once the heater is connected to mains electricity. During
the warming up time, the yellow LED light will be on, including when the air flow through the heater is sufficient.
• 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. See page 37-38.
• 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 10kΩ @ 30°C, 11.7kΩ @ 20°C and 15kΩ @
0°C. The external set point potentiometer should have the resistance 0...5kΩ.
Full heating power but no regulation
• 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
• 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 9.
• 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).
• 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.
Summary of Contents for MQC
Page 29: ...29 VFLPG VFL VTL VRA 1 40 2 VFLPG VFL VTL VRA 3 4 5 6 7 8 9 100 1 2 24 3 1 2 3...
Page 35: ...MQEM MQEML 35 VFLPG VFL VTL VRA...
Page 44: ...44 VFLPG VFL VTL VRA MQX MQXL MQY MQYL...
Page 48: ...48 VFLPG VFL VTL VRA MQC MQCL...
Page 53: ...53 VFLPG VFL VTL VRA MQP MQPL...
Page 54: ...54 VFLPG VFL VTL VRA...
Page 55: ...55 VFLPG VFL VTL VRA...
