ABB PSTX Series Installation And Commissioning Manual page 127

7.21.1 Manual pump cleaning
Manual means that the user at any point in time decides
which direction the motor shall rotate by activating the
forward and reverse pump cleaning commands. The
commands can be given in the HMI, or using hardware
I/O's or the fieldbus. The same parameters that are used
for Automatic pump cleaning are also used for Manual
pump cleaning, see chapter 7.21.2 Automatic pump
cleaning
7.21.2 Automatic pump cleaning
Automatic means that the Softstarter runs the pump
cleaning sequence only when the automatic pump
cleaning command is activated and stops as soon as it is
deactivated. When automatic pump cleaning is run, the
motor first starts rotating in the backward direction.
Different motor control functions are combined to achieve
the forward and reverse run of the motor.
1. Slow speed jog reverse. Parameter 29.01 (Pump
clean reverse speed) decides which slow speed
should be used. The parameter 29.02 (Pump
clean reverse strength) decides how fast the
motor accelerates to the slow speed in the
reverse direction. It is recommended to set it to a
high value (60 – 100%) to achieve an aggressive
acceleration for clogging or enough torque for
jamming.
2. Forward direction. Parameter 29.03 (Pump clean
forward start mode) decides which start method
should be used to accelerate the motor in the
forward direction. Default is Full voltage start which
very quickly accelerated the motor up to full speed
in the forward direction. If a softer start is needed
parameter 29.03 (Pump clean forward start mode)
can be set to Torque ramp or Voltage ramp, then
the parameter 02.03 (Start ramp initial level) and
02.04 (Start ramp time) are used in the pump
cleaning forward start. 29.04 (Pump clean auto
forward time) decides how long time the motor
should be run in the forward direction.
3. When it is time to switch direction from forward
to reverse the parameter 29.08 (Pump clean stop
mode) decides if a stop ramp should be run to
avoid any water hammering that might otherwise
occur. Immediately after the stop ramp a dynamic
brake quickly bring the motor to stand still.
Parameter 29.08 (Pump clean stop mode) is set
default to Torque ramp and brake. The Torque
ramp or Voltage ramp in the Pump clean stop
mode can be adjusted by parameter 02.05 (Stop
ramp end level) and parameter 02.06 (Stop ramp
time). The Dynamic brake in the Pump clean stop
mode can be adjusted by the parameter 29.06
(Pump clean brake strength) and parameter 29.07
(Pump clean brake timeout). The parameter 29.06
(Pump clean brake strength) decides how fast
the motor will decelerate from full speed. It is
recommended to set a high value (50 – 60%) to
achieve an aggressive deceleration. If the brake
takes longer time than 10s, increase the parameter
29.07 (Pump clean brake timeout).
1SFC132081M0201 | Installation and commissioning manual | Functions
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