ABB +N5600 Firmware Instructions page 273

No. Name/Value
25.08 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
1500 rpm.
Speed decrease = 0.50 × 0.01 × 1500 rpm = 7.5 rpm.
Motor speed in
% of nominal
100%
0.00 ... 100.00%
25.09 Speed ctrl
balancing enable
Not selected
Selected
DI1
DI2
DI3
DI4
DI5
Description
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 load.
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
each other.
The correct droop rate for a process must be found out case
by case in practice.
No drooping
Drooping
Droop rate.
Selects the source for enabling/disabling speed controller
output balancing.
This function is used to generate a smooth, "bumpless"
transfer from a torque- or tension-controlled motor back to
being speed-controlled. When balancing is enabled, the
output of the speed controller is forced to the value of
Speed ctrl balancing ref.
Balancing is also possible in the ramp generator (see
parameter 23.26 Ramp out balancing
0 = Disabled
1 = Enabled
0.
1.
Digital input DI1 (10.02 DI delayed
Digital input DI2 (10.02 DI delayed
Digital input DI3 (10.02 DI delayed
Digital input DI4 (10.02 DI delayed
Digital input DI5 (10.02 DI delayed
25.08 Drooping rate
Speed controller
output / %
100%
enable).
status, bit 0).
status, bit 1).
status, bit 2).
status, bit 3).
status, bit 4).
Parameters 273
Def/FbEq16
0.00%
Drive load
100 = 1%
Not selected
25.10
1
2
2
3
4
5
6