Err
or code
Diagnostic code
Meaning for the LMV37.4... system
Remedy
Bit 0
Valency 1
Line interruption
Line interruption detected at actuator
’s terminals
check wiring (voltage X53 acr
oss pin 5 or 6 and pin 2 >0.5 V)
Bit 3
Valency
≥
8
Curve too steep in terms of r
amp r
ate
Check position differ
ential between the curvepoints and the modu
lating
oper
ating r
amp setting (par
ameter 544).
1.
Modulating oper
ating r
amp 32 seconds
The slope of the curve may be a maximum position change of 31
° (15° for
SQM33.6 and 9° for SQM33.7) between 2 curve points in modulati
ng mode.
2.
Modulating oper
ating r
amp 64 seconds
The slope of the curve may be a maximum position change of 62
° (30° for
SQM33.6 and 18° for SQM33.7) between 2 curve points in modula
ting mode.
Bit 4
Valency
≥
16
Sectional de
viation in comparison with last r
efer
encing
Actuator was o
verloaded or mechanically twist
ed.
1. Check the setting of the actuator type (par
ameter 613.1)
2.
Check to see if the actuator is blocked some
wher
e along its working r
ange.
3. Check to see if the tor
que is sufficient for the application
90
#
Internal err
or basic unit
91
#
Internal err
or basic unit
93
#
Err
or flame signal acquisition
3
Short-cir
cuit of sensor
Short-cir
cuit at QRB
...
1. Check wiring.
2. Flame detector possibly fault
95
#
Err
or r
elay supervision
3 Ignition tr
ansformer
4 Fuel valve 1
5 Fuel valve 2
6 Fuel valve 3
External po
wer supply active contact
Check wiring
96
#
Err
or r
elay supervision
3 Ignition tr
ansformer
4 Fuel valve 1
5 Fuel valve 2
6 Fuel valve 3
Relay contacts have welded
Test the contacts:
1. Unit connected to po
wer: Fan output must be dead.
2.
Disconnect po
wer: Disconnect fan. No r
esistive connection between fan output
and neutr
al conductor allo
wed.
If one of the 2 tests fails, r
elease the unit since contact have definitively welded
and safety can no longer be ensur
ed.
Summary of Contents for STG 146i/2
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