ABB ACS880 Firmware Manual page 273

Industrial drives, winder control program, option +n5000

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Drooping rate

Speed decrease = Speed controller output × Drooping × Nominal speed

Example: Speed controller output is 50%, droop rate is 1%, nominal speed of the drive is

Speed decrease = 0.50 × 0.01 × 1500 rpm = 7.5 rpm.

Motor speed in

% of nominal

0.00 ... 100.00%

Speed ctrl balancing

Not selected

Defines the droop rate in percent of the nominal motor

speed. Drooping decreases the drive speed slightly as the

drive load increases. The actual speed decrease at a certain

operating point depends on the droop rate setting and the

drive load (= torque reference / speed controller output). At

100% speed controller output, drooping is at its nominal

level, i.e. equal to the value of this parameter. The drooping

effect decreases linearly to zero along with the decreasing

The droop rate can be used e.g. to adjust the load sharing in

a Master/Follower application run by several drives. In a

Master/Follower application the motor shafts are coupled to

The correct droop rate for a process must be found out case

by case in practice.

Selects the source for enabling/disabling speed controller

output balancing.

This function is used to generate a smooth transfer from a

torque- or tension-controlled motor back to being speed-

controlled. The balancing output would be tracking the

present "line" speed of the application and when transfer is

required, the speed reference can then be quickly "seeded"

to the correct line speed. Balancing is also possible in the

ramp generator, see parameter

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