Stop Mode - ABB PST30 Installation And Commissioning Manual

U
Stop
rpm
Stop
Figure 3: Voltage ramp
U
Stop
rpm
Stop
Figure 4: Torque ramp
1SFC132003M0201

10:3 Stop mode

Time
Time
Time
Parameter
text
Stop Mode Volt
Time
Path in menu:
Menu/SETTINGS/Functional Settings/
Torque control/ Stop Mode
Using the PST softstarter it is possible to choose between
two different types of stop ramps. These are voltage ramp
and torque ramp.
Voltage ramp When using the voltage ramp, the voltage
is decreased linearly from full voltage to
the end voltage during stop. Since the
torque depends on both the voltage and
the current, the torque curve does not
always follow the voltage curve. This has
the effect that the torque curve will not
increase or decrease linearly.
Torque ramp When using the torque ramp, the output
voltage to the motor is controlled so that
the torque will follow a predefined optimal
curve from full voltage to end voltage
during stop. This has the benefit that the
mechanical stopping behavior of the
equipment driven by the motor will be
much softer than when using voltage
ramp. This can be especially useful in
pump applications where a sudden stop
can cause water hammering and
pressure surges.
Default value Setting range Description
Volt, Torque Type of stop
ramp
Chapter 10
Functions
133