Siemens LMV37.4 Series Basic Documentation page 222

Error
Diagnostic code
code
Bit 4

Valency 16
Bit 5

Valency 32
84 #
Bit 0
Valency 1
Bit 1
Valency 2..3
Bit 2
Valency 4..7
222/235
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Meaning for the LMV37.4... system
Interruption of speed signal
Quick shutdown due to excessive speed deviation
Curve slope actuators
VSD: Curve too steep in terms of ramp speed
Fuel actuator: Curve too steep in terms of ramp rate
Air actuator: Curve too steep in terms of ramp rate
Basic documentation LMV37.4...
29 Error code list
Remedy
Curve slope max. 10% for LMV37.4 ramp of 40 seconds (20% for 20 seconds or 40% for 10
seconds)
→ Between the ignition point (P0) and the low-fire point (P1), the speed change in modulating
mode may be a maximum of 40%, independent of the LMV3... ramp.
2. The setting of the VSD ramp must be about 20% faster than the ramps in the basic unit
(parameters 522, 523).
No speed detected in spite of control.
1. Check if the motor turns.
2. Check if the speed sensor delivers a signal (LED / check distance from the sensor disk).
3. Check wiring of the VSD.
Speed deviation was for about 1 s >10% outside the anticipated range.
1. Check ramp times of the LMV37.4... and VSD.
2. Check wiring of the VSD.
Check speed differential between the curvepoints and the modulating operating ramp setting
(parameter 544).
1. Modulating operating ramp 32 seconds
Curve slope max. 10% for LMV37.4 ramp of 20 seconds (20% for 10 seconds or 40% for 5 seconds)
2. Modulating operating ramp 48 seconds
Curve slope max. 10% for LMV37.4 ramp of 30 seconds (20% for 15 seconds or 30% for 10 seconds)
3. Modulating operating ramp 64 seconds
Curve slope max. 10% for LMV37.4 ramp of 40 seconds (20% for 20 seconds or 40% for 10 seconds)
→ Between the ignition point (P0) and the low-fire point (P1), the speed change in modulating
mode may be a maximum of 40%, independent of the LMV3... ramp.
2. Setting of the VSD ramp must be about 20% shorter than the ramps in the basic unit
(parameters 522 and 523)
Check position differential between the curvepoints and the modulating operating ramp setting
(parameter 544).
1. Modulating operating ramp 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 modulating mode.
2. Modulating operating ramp 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 modulating mode.
Check position differential between the curvepoints and the modulating operating ramp setting
(parameter 544).
1. Modulating operating ramp 32 seconds
The slope of the curve may be a maximum position change of 31° (15° for SQM33.6 and 9° for
CC1P7546en
20.09.2013