ABB ACQ810 - Page 245

Parameters 245
Master speed The drive follows the same reference (received from the PI
controller) as the master, but is started and stopped by the
logic. This is usually the most economical follower mode.
2
In case the master status switches from one drive to another
and the reference changes drastically, the drive compares
the most recent reference value with the previous reference.
If the difference between the references is more than 10%,
the follower will accelerate/decelerate towards the new
reference along a ramp. The acceleration and deceleration
ramps are defined by parameters 75.26 Master speed acc
and 75.27 Master speed dec respectively. The ramping will
end when the new reference is reached.
No. Name/Value Description FbEq
Frequency
Flow demand
Drive status
Master Follower
Drive 1
Stopped Master
Follower
Drive 2
Stopped Master
Drive 3
D
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1
D
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2
D
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3