The device can be switched on (i.e. green LED is lit),
the heater warms up, but the preset temperature is
not reached.
- Check the sensor cable.
- Check the power supply to the heater (all 3 phases
must contact the zero conductor.)
- The regulator knob must stop when turned all the
way to the right and to the left and must not
rotate around its axis.
The unit can be switched on, but the heater does not
warm up.
- Check the overtemperature cut-out in the sensor
case. Resistance is approximately 0 ohms.
- Check the KTY sensor in the sensor case.
Resistance is approximately 1 kOhm at 21°C.
Check the cables leading to the sensor case for
short circuits and disconnections.
- The unit cannot be switched on but the LED
flashes.
- Check the timer. If necessary, turn the timer knob
to the left, switch off the controller, then switch it
back on.
Check the overtemperature cut-out:
The controller is equipped with an overtemperature
cut-out in the sensor case which in the event of
overtemperature, e.g. due to a defective controller,
forces the system to cut out at 127°C. A tripped
overtemperature cut-out is defective and the sensor
circuit board must be replaced.
Note for the electrician:
Bridge the overtemperature cut-out (strictly for
testing purposes only)
- Measure the voltage at the connector terminals.
A defective overtemperature cut-out reads
approx. 24 V ~.
5
Anleitung ESS 9000-T_GB 24.10.2001 10:04 Uhr Seite 5
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