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Overheat alarm
The controller has a temperature sensor for the internal heatsink.
The temperature value of the heatsink is in variable INPTC; the over_heat alarm trips when the temperature exceeds 85°C.
This condition may be caused by obstructed air vents or by a blocked cooling fan.
Is provided the intervention of the alarm also for speed of temperature rise (derivate) INPTC greater than 7°C in 12
seconds.
With the over_heat alarm on, the control disables control outputs OUT 1, OUT 2, OUT 3 and OUT 4.
The alarm over_heat is canceled when the heat sink temperature falls below the value of 75°C.
There is another maximum temperature protection that disables the hardware for the SSR controls.
655
675
80397M_MSW_GFX4-GFXTERMO4_08-2018_ENG
INPTC:
R
SSR temperature
INPTC_DER:
R
derivative of the SSR temperature
°C
°C/12sec
35
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