80 Functions | Installation and commissioning manual | 1SFC132081M0201
7.3.2 Torque stop ramp
When using the Torque stop ramp, the output voltage to
the motor the torque follows a specified optimal curve
from the Step down level to end voltage during stop. The
Torque stop ramp makes the equipment that the motor
drives stop much softer than when using voltage ramp.
See Figure 7.5.
This can be especially useful in pump applications where
a sudden stop can cause water hammering and pressure
surges.
Configuration of the Torque stop ramp with these
parameters:
Parameter Description Setting range Default value
02.02 Stop mode Set to Torque ramp. No ramp,
Voltage ramp,
Torque ramp,
Dynamic brake
No ramp
02.05 Stop ramp end level Sets the level from where the stop ramp ends and
the power to the motor is cut(voltage level for Voltage
stop and torque level for Torque stop.
10 ... 99% 30%
02.06 Stop ramp time Sets the time it takes for the voltage to come at end
level.
1 ... 120 s 10 s
28.05 Step down level Sets the level from where the stop ramp initiates. 10 ... 100% 80%
28.08 Torque tune Sets the adjustment of resistive losses. 0...1000% 100%
28.09 Torque ctrl gain Sets the speed of the voltage regulator during torque
start and stop. It seldom needs to be changed,
but if a dip occur in the torque curve during stop,
increasing this value might solve it.
0.01 ... 10 0.02
28.10 Torque PI integration time Sets the integration time of PI controller. 0.001 ... 10 s 0.004 s
28.11 Torque slip Sets the slip difference from nominal to pull-out
torque in percentage.
0.1 ... 100% 1.0%
28.12 Torque diff Sets the maximum desired difference between
reference and actual torque in percentage.
0.1 ... 100% 2.0%
28.13 Torque filter time Sets the Torque control filter time in seconds. 0.01 ... 10 s 0.02 s
Figure 7.5
Torque stop ramp
1SFC132081M0201
rpm
U
Stop Time
Stop Time
7
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