29
3 System Operation
Possible causes:
– Relay module not connected or connected wrongly
– Relay or relay module defective
– External voltage is fed into the corresponding terminal
– Terminal 9 and terminal 10 reversed
– 24V fuse F2 (front panel) defective
Check wiring
Check relay
– measure coil for continuity
With relay module V4:
– fuse F1-F4, F6 defective
– too less load at terminal 82-84
– at terminals 82-86 a testing current has to flow in both directions. Otherwise the relay mod-
ule switches all outputs off during the self-test and the FMS gets faulty.
– Impedance at a supply voltage of 230V Z<= 100kΩ
110 V Z<= 22kΩ
As the case may be adequate loads have to be connected (e. g. ohmic resistance or RC mod-
ule)
Outputs, which are not switched off by the FMS (e. g. ignition valve at start without pilot burner)
doesn't need any load.
A20
Fault 370
The internal communication is not functioning.
Voltage off and back on
After changing EPROM:
Check whether the monitoring program EPROM is correctly inserted.
Otherwise:
Change processor card
A21
Fault 901, 911, 904,
912, 905, 913, 906,
914, 915
After changing a potentiometer the reference must be inputted again.
Voltage levels are checked in the unit. These can give rise to false errors as a result of incor-
rect external wiring.
Check wiring. In the case of analog inputs the reference element serves for voltage supply to
the potentiometers
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