FMS Fault Correction
General Faults (A)
Aids
The FMS checks the function of all connected relays on the external modules.
Fault
500
520
921
The voltage present on the relay coils is read back.
501
521
922
Possible causes:
502
522
923
- Relay module not connected or connected wrongly
503
523
924
-
Relay or relay module defective
504
524
925
-
External voltage is fed into the corresponding terminal
505
525
926
-
Terminal 9 and terminal 10 reversed
506
526
927
- 24V fuse F2 (front panel) defective
507
527
928
Check wiring
508
528
929
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 inboth directions. Otherwise
the relay module switches all outputs off during the selftest and the FMS
gets faulty.
- Impendance at a supply voltage of
230V
#
100 kOhm
110V
#
22 kOhm
As the case may be adequate loads have to be connected (e. g. ohmic
resistance or RC modue)
Outputs, which are not switched off by the FMS ( e. g. ignitionv valve at start
without pilot burner) doesn't need any load.
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The internal communication is not functioning.
Voltage off and back on
Fault
370
After changing EPROM
Check whether the monitoring program EPROM is correctly inserted
Otherwise:
Change processor card
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A
fter changing a potentiometer the reference must be inputted again.
Fault
901
911
Voltage levels are checked in the unit. These can give rise to false errors
904
912
as a result of incorrect external wiring.
905
913
Check wiring
906
914
In the case of analog inputs the reference element serves for voltage supply
915
to the potentiometers.
+
External contact at connector
loop possibly transposed,
see D4 and E4
-
in the case of fault 904, 911 915, in particular, check the corresponding
reference, In the unloaded condition (terminal open) it is 2.4 V.
With potentiometer connected somewhat lower, depending on the resistance
of the potentiometer.
Re-enter reference value with potentiometer connected.
Selector switch (2) to "Setting"
Back to "Automatic"
-
new reference value is stored.
93
A19
A20
A21
reference voltage
