ABB PSTX720 - Page 77

1SFC132081M0201 | Installation and commissioning manual | Functions 77
7.2.2 Voltage stop ramp
When the Softstarter receives a stop signal, the
Softstarter decreases the output voltage to the motor in a
quick stop ramp, from full voltage down to set Step down
voltage level. For best performance, set the step down
level to 80%.
When step down level is reached, the Softstarter controls
the output voltage during preset Stop ramp time to End
voltage level and cuts the output voltage to the motor,
see Figure 7.3.
Configuration of the Voltage stop ramp with these
parameters:
Parameter Description Setting range Default value
02.02 Stop mode Set to voltage 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 effective 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%
Figure 7.3
Voltage stop ramp
1SFC132081M0201
30%
80%
U
100%
Time
End voltage
Step down voltage
Stop ramp time
7