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8.3 Temperature monitoring
The flow temperature and the room temperature can be monitored for any deviations. This func
-
tion is activated in Co5 -> Fb20. The controller issues an alarm when:
4
the flow temperature deviates from its set point by more than 10 °C for more than 30
minutes
4
the room temperature falls below its set point by 2 °C for more than 30 minutes
4
the return flow temperature limitation is active for more than 30 minutes.
When one of these conditions occurs, the bit for the associated sensor is set in holding regis
-
ter 857. A set bit in holding register HR 857 causes the bit 4 to be set in the error status register
FSR2 (HR 61) and in the error archive register 2 (HR 63) and the error counter (HR 64) is incre
-
mented.
Function
WE Configuration
Temperature monitoring OFF Co5 -> Fb20 = ON
Holding register 857 ( appears on the right-hand side of the set bit number)
Number = Bit number in HR 0 123456789101112
VFprim: Measured value (set point + 10 °C)
RüFprim: Limitation active
(actual return flow blinks in InF5)
VF1: Meas. value >
(set point +10 °C)
RüF1: Limitation active
RF1: Meas. value <
(set point – 2 °C)
VF2: Meas. value >
(set point + 10 °C)
RüF2: Limitation active
RF2: Meas. value <
(set point – 2 °C)
VF3: Meas. value >
(set point + 10 °C)
RüF3: Limitation active
RF3: Meas. value <
(set point – 2 °C)
VFTW: Meas. value >
(set point + 10 °C)
RüFTW: Limitation active
(actual return flow blinks in InF4)
70 EB 5179 EN
Operational faults