3RW3 semiconductor motor control unit
SIRIUS System Manual
8-36
GWA 4NEB 430 0999-02b
Attachment of the fan
Figure 8-19: Accessories: attachment of the fan
Terminal covers
To provide additional finger protection, for frame sizes S2 and S3 the termi-
nal covers of the 3RT1 contactors of the same frame sizes can be used.
Installation on the soft starter is analogous to that on the contactors.
Link modules
The same link modules are available for building fuseless feeders (soft
starter + 3RV circuit breaker) as are used for the 3RT contactor + 3RV circuit
breaker combinations.
Refer to the information and assignment tables in Section 8.3.2, "Installation
guidelines".
RC element
If the 3RW30/31 soft starter is to be controlled from a PLC with a Triac or
thyristor output, malfunctioning can be avoided with an RC element. If there
is leakage current of more than 1 mA, without an RC element the soft
starter may interpret the drop in voltage that occurs at the input as an "ON"
command.
Connection example for
an RC element
Figure 8-20: Connection example with an RC element
2
1
A2
A1
IN1
Auxiliary supply
PLC control contact
RC element
3RW30/31...
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