Status Messages Installation and Operation Manual - COMTEC
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OXITEC
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DustEx
20 Doc.-ID: COM_OXI_Dust_11022020
6.4 Heater Control Unit
The heater control unit (HCU-0001) is fail-safe (redundantly) constructed. It switches the probe heater off
automatically when exceeding the operating temperature of the probe. The switch-off temperature is set at 810°C /
1490°F. Beyond that, the heating is switched off if the temperature difference between the two thermocouples
exceeds
30°C / 54°F. The electronic unit goes into a state of self-preservation. This means that with the occurrence of a
disturbance the electronic unit must be reset by powering off the system and switching it back on. The disturbances
are signaled by red LEDs on the plate. The green LED signals the error free operating condition.
Figure 41 - Heater control unit (Article-No. HCU-00001)
LED 1 on: Temp. difference shutdown,
thermocouple may be broken (Reset of
the electronic unit by the reset button)
HEATER OFF
LED 2 on: .Over temp. shut down. More
than 810°C is measured on thermocouple
1
HEATER OFF
LED 3 on: Over temp. shut down. More
than 810°C is measured on thermocouple
2
HEATER OFF
LED 4 and 5 on: Error free operating
state, HEATER ON
In the front panel an opening marked "HCU LED" shows the error
LEDs.
Whenever one of the red LEDs is lit, the heater is not
in working order. Power off the system and switch it back on to
remedy this error.
SME-53
Figure 42 - HCU LED opening
SME-54
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