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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 11 Fan control 01.12.2009
6. Close the standardization
When standardization is successfully completed, reset parameter 641 to
0.
If standardization was not successful, parameter 641 assumes a negative value.
The value provides information on the cause of fault:
Value Error Recommended measures
-1 Timeout of standardization (VSD’s ramp
down time too long)
Timeout at the end of standardization during ramp
down of VSD.
1. VSD ramp time settings are not shorter than those
of the basic unit (parameter 523).
-2 Storage of standardized speed not
successful
Error during storage of standardized speed → lock
the basic unit and reset it again, repeat standardiza-
tion
-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 actuated by the sensor disk
(check distance).
-4 Speed variation / VSD ramp up time too long
/ speed below minimum limit for standardiza-
tion
Motor has not reached a stable speed after ramp up.
1. VSD ramp time settings are not shorter than those
of the basic unit (parameters 522, 523).
2. VSD’s characteristic is not linear. Configuration of
voltage input at the VSD must accord with that of
the basic unit (DC 0…10 V).
3. VSD does not follow quickly enough the change of
the basic unit. Check VSD settings (input filter,
slippage compensation, hiding various 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 in the wrong direction
→ change
parameterization of the direction of rotation or inter
change 2 live conductors.
2. Sensor disk is fitted the wrong way
→ turn sensor
disk.
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