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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
82 # Error during VSD’s speed standardization
1
Timeout of standardization (VSD ramp down time too
long)
Timeout at the end of standardization during ramp down of the VSD
1. Ramp time settings of the VSD are not shorter than those of the basic unit (parameter: 523)
2 Storage of standardized speed not successful
Error during storage of the standardized speed
→ lock the basic unit, then reset it and repeat the standardization
3 Open-circuit speed sensor
Basic unit receives no pulses from the speed sensor:
1. Motor does not turn.
2. Speed sensor is not connected.
3. Speed sensor is not activated by the sensor disk (check distance)
4
Speed variation / VSD ramp up time too long / speed
below minimum limit for standardization
Motor has not reached a stable speed after ramp up.
1. Ramp time settings of the VSD are not shorter than those of the basic unit (parameters 522,
523).
2. Characteristic of the VSD is not linear. Configuration of the voltage input at the VSD must
accord with that of the basic unit (parameter 645).
3. VSD does not follow quickly enough the changes of the basic unit. Check settings of the VSD
(input filter, slippage compensation, hiding different speeds)
4. Speed of VSD lies below the minimum for standardization (650 1/min)
5 Wrong direction of rotation
Motor’s direction of rotation is wrong.
1. Motor turns indeed in the wrong direction
→ change parameterization of the direction of rotation or interchange 2 live conductors.
2. Sensor disk is fitted the wrong way
→ turn the sensor disk.
6 Unplausible speed sensor signals
The required pulse pattern (60°, 120°, 180°) has not been correctly identified.
1. Speed sensor does not detect all tappets of the sensor disk
→ check distance
2. As the motor turns, other metal parts are detected also, in addition to the tappets
→ improve
mounting.
3. Electromagnetic interference on the sensor lines
→ check cable routing, improve EMC
7 Invalid standardized speed
The standardized speed measured does not lie in the permissible range.
1. Motor turns too slowly or too fast.
15 Speed deviation µC1 + µC2
The speeds of microcomputer 1 and 2 deviated too much. This can be caused by wrong standard-
ized speeds (e.g. after restoring a data set to a new unit) → repeat standardization and check the
air-fuel ratio
20 Wrong phase of phase manager
Standardization was made in a wrong phase. Permitted are only phases ≤12 → controller OFF,
start standardization again
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