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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 11 Fan control 01.12.2009
11.6 Ramp time
The ramp time for
PWM fan control can be set separately for acceleration and decel-
eration (also refer to subsection
Running speed / maximum curve slope).
No. Parameter
522 Ramp up
523 Ramp down
If shutdown occurs because the speed has not been reached, the VSD / PWM fan might
not be able to follow quickly enough the set ramp.
Remedy:
Shorten further the ramp of the VSD / PWM fan or increase the ramp in the basic unit
(parameters 522 / 523) (also refer to subsection
Running speed / maximum curve
slope
).
Caution!
The ramps parameterized in the VSD should be at least 20% shorter than the
ramps in the LMV37.4...
Example:
10 s ramp LMV37.4... 8 s ramp VSD
5 s ramp LMV37.4... 4 s ramp VSD
For VSD operation
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