Device Functions
SIRIUS 3RW44 manual
6-12 GWA 4NEB 535 2195-02 DS 02
6.3.2 Torque Control and Pump Stop
In "Torque-controlled" and "Pump stop" mode, the coasting down process /
natural run-down of the load is extended. This function is set if abrupt stopping of
the load is to be prevented. This is typical in applications with small mass
reactances or high counter torques.
For optimum torque control during the stopping process, the motor data of the
motor connected to the soft starter should be entered in the selected parameter.
This can be specified using the "Setting" menu item.
Stopping time and
stopping torque
The "stopping time" parameter of the soft starter can be used to specify for how
long power should be fed into the motor after removal of the switch-on
command. Within this stopping time, the torque generated in the motor is
continuously and linearly reduced to the set stopping torque and the application
is smoothly stopped.
Pump stop In pump applications, so-called water hammers may occur if the drive is stopped
abruptly without using pump stop. This water hammer is caused by the sudden
stall and the accompanying pressure variations in the pump. It involves noise
and mechanical impact on the piping as well as on the flaps and valves inside
the system.
Fig. 6-7: Soft stop / pump stop
Typical applications for soft stop / pump stop
Use soft stop / pump stop
• in pumps to prevent water hammer.
• in conveyor belts to prevent goods from toppling.
Caution
Risk of damage to property.
For optimum motor protection use a combination of electronic motor overload
protection and evaluation of a temperature sensor integrated into the motor.
Motor torque
M
Tim
s
M
Nominal operation
Stopping time
Stopping torque
Stop command
at
soft starter
4_8_Menü_Auslaufart_Drehmomentregelung_
Pumpenauslauf.wmf
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