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3RW3 semiconductor motor control unit
SIRIUS System Manual
GWA 4NEB 430 0999-02b
8-11
Isolation
According to DIN VDE 0100, isolation from the supplying network cannot be
provided by a semiconductor element (i.e. soft starter, frequency converter,
contactor, or similar).
To implement isolation from the supplying network, a 3RV circuit breaker (or
another isolating device that fulfills the requirements of DIN VDE 0100)
must be used in addition to the contactor or soft starter. A contactor alone
in combination with the soft starter is not enough.
Both isolation and normal switching duty can be implemented quickly and
easily with the 3RW3 soft starter in combination with the modules from the
SIRIUS modular system.
Variants
The electronic soft starters are available in two variants:
Standard 3RW30 variant
The standard 3RW30 variant is used for single-speed motors. This variant is
available in all four frame sizes. The starting voltage U
s
, starting time t
Ron
,
and coasting-down time t
Roff
can be set independently of each other on the
device. The device is switched on by means of a cycling contact IN.
3RW31 special variant
The 3RW31 special variant cycles pole-changing motors (Dahlander wind-
ing). The following can be set independently of each other:
• Starting voltage U
s
• Starting time of initial speed t
R1
• Starting time of second speed t
R2
The device does not have a coasting-down function. The set starting voltage
applies to both ramp times t
R1
and t
R2
.
The ramp time is selected by means of two inputs, IN1 and IN2, that switch
the soft starter on.
The devices of the 3RW31 series are only available in frame size S0.
Settings
The devices can be set as follows:
3RW30
By means of 3 potentiometers for setting:
• Starting time in the range from 0 to 20 seconds
• Starting voltage in the range from approx. 30 to 100% of the rated voltage
of the motor
• Coasting-down time in the range from 0 to 20 seconds
3RW31
By means of 3 potentiometers for setting:
• Starting time 1 in the range from 0 to 20 seconds
• Starting voltage in the range from approx. 30 to 100% of the rated voltage
of the motor
• Starting time 2 in the range from 0 to 20 seconds
A special software program ensures that progressive ramp times are set.
Short times of up to 5 seconds can thus be set very precisely.
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