Siemens 3RW30-40 Soft Starter
– Quick Start Guide
© 2020 North American Electric, Inc.
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2
MAN-CUST-0004
REV 1.2
2.0
Configuration
Soft Start must be appropriately configured to application demands with the Parameterization Potentiometers
before operation or operation-inhibiting faults will occur.
NAE is not responsible for damage caused by incorrect parameterization
3RW30 & 3RW40 Parameterization Potentiometers (3-5 only available on 3RW40 Series)
2.1
Remote Run: Default Control Method
1. U potentiometer
The starting voltage value is set with the U potentiometer. This Value determines
the starting torque of the motor. A lower starting voltage results in a lower starting
torque (soft start) and a lower starting current.
2. t potentiometer
You define the length of the required ramp time with the t potentiometer. The ramp
time determines the time taken to increase the motor voltage from the parameterized
starting voltage to the mains voltage. This time merely influences the
motor’s
acceleration torque, which drives the load during the ramp-up process. The actual
motor starting times are load-dependent and can differ from the 3RW soft starter setting.
3. t potentiometer
You can set a ramp-down time with the t potentiometer. This determines how long
power should still be supplied to the motor after the ON command is removed.
The torque generated in the motor is reduced by means of a voltage ramp function
within this ram-down time and the application stops smoothly.
4. l
e
potentiometer
The rated operational current of the motor must be set with the
l
e potentiometer
5. xl
e
potentiometer
The current limiting value is set with the
xl
e potentiometer to the maximum required
starting current as a factor of the set rated motor current (
l
e)
