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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 28 Error code list 01.12.2009
Error
code
Diagnostic code Meaning for LMV37.4... system Recommended measures
83 # Speed error VSD
Required speed has not been reached
Bit 0
Valency 1
Lower control range limitation
Speed has not been reached because control range limitation has become active
→ for measures, refer to error code 80
Bit 1
Valency 2...3
Upper control range limitation
Speed has not been reached because control range limitation has become active
→ for measures, refer to error code 80
Bit 2
Valency 4...7
Interrupt shutdo wn due to electromagnetic interference
Speed has not been reached due to too much electromagnetic interference on the sensor line
→ for measures, refer to error code 81
Bit 3
Valency
≥
8
Curve too steep in terms of ramp speed
Speed has not been reached because detected curve slope was too steep.
1. With a LMV3... ramp of 20 s, the curve’s slope may be a maximum of 10% speed change be-
tween 2 curvepoints in modulating mode.
With a LMV3... ramp of 10 s, the curve’s slope may be a maximum of 20% speed change between
2 curvepoints in modulating mode.
With a LMV3... ramp of 5 s, the curve’s slope may be a maximum of 40% speed change between
2 curvepoints in modulating mode.
→ 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).
Bit 4
Valency
≥
16
Interruption of speed signal
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.
Bit 5
Valency
≥
32
Quick shutdown due to excessive speed deviation
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.
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