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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
84 # Curve slope actuators
Bit 0
Valency 1
VSD: Curve too steep in terms of ramp speed
1. The curve's slope may be a maximum of 10% speed change between 2 curvepoints in modulat-
ing operation, with a LMV3... ramp of 20 seconds
The curve's slope may be a maximum of 20% speed change between 2 curvepoints in modulating
operation, with a LMV3... ramp of 10 seconds
The curve's slope may be a maximum of 40% speed change between 2 curvepoints in modulating
operation, with a LMV3... ramp of 5 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)
Bit 1
Valency 2..3
Fuel actuator: Curve too steep in terms of ramp rate
The slope of the curve may be a maximum position change of 31° between 2 curvepoints in
modulating mode
Bit 2
Valency 4..7
Air actuator: Curve too steep in terms of ramp rate
The slope of the curve may be a maximum position change of 31° between 2 curvepoints in
modulating mode
85 #
Referencing error ones actuators
0 Referencing error of fuel actuator
Referencing of fuel actuator not successful.
Reference point could not be reached.
1. Check to see if actuators have been mixed up
2. Check to see if actuator is locked or overloaded
1 Referencing error of air actuator
Referencing of fuel actuator not successful
Reference point could not be reached.
1. Check to see if actuators have been mixed up
2. Check to see if actuator is locked or overloaded
Bit 7
Valency
≥
128
Referencing error due to parameter change
Parameterization of an actuator (e.g. the reference position) has been changed.
To trigger new referencing, this error is set
86 # Error fuel actuator
0 Position error
Target position could not be reached within the required tolerance band.
1. Check to see if actuator is locked or overloaded.
Bit 0
Valency 1
Open-circuit
Open-circuit detected at the actuator’s terminals.
1. Check wiring (voltage X54 across pin 5 or 6 and pin 2 >0.5 V).
Bit 3
Valency
≥
8
Curve too steep in terms of ramp rate
The slope of the curve may be a maximum position change of 31° between 2 curvepoints in
modulating mode
Bit 4
Valency
≥
16
Step deviation in comparison with last referencing
Actuator was overloaded or mechanically twisted.
1. Check to see if the actuator is blocked somewhere along its working range.
2. Check to see if the torque is sufficient for the application.
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