3RW3 semiconductor motor control unit
SIRIUS System Manual
GWA 4NEB 430 0999-02b
8-21
Correction factor for the
current setting of the
overload relay
In combinations of a 3RW30 soft starter + 3RU1 thermal overload relay or
3RW30 software starter + 3RB10 electronic overload relay, the set value of
the overload relay must be corrected appropriately. The correction factor
specifies the extent of the change.
Example:
Correction factor for the current setting of the overload relay 0.9
Selected device = 3RW3014-1CB14
The connected motor has a motor rated current of 5 A.
The set value of the overload relay now has to be changed to:
0.9 x 5 A = 4.5 A
8.3.3 Overview tables: correction factors
The tables below give the correction factors for the circuit-breaker current
setting, the device rated current, and the switching frequency.
The values indicate the difference between use with a fan (accessory) and
use without a fan.
All correction fans apply throughout the entire temperature range (i.e. for
40 °C, 50 °C, and 60 °C).
The various tables specify the values in turn for the following:
3RW30/31 soft starters in a stand-alone installation
3RW30/31 soft starter + 3RV1 circuit breaker
3RW30/31 soft starter + 3RT1 contactor + 3RU1 thermal overload relay
3RW30/31 soft starter + 3RT1 contactor + 3RB10 electronic overload relay
8.3.3.1 3RW30/31 soft starters in a stand-alone installation
Minimum clearance
In the case of frame size S00 (3RW301..), the following applies to stand-
alone, vertical installation without directly attached switching devices:
In order to maintain the required space above the arc chute, clearance of at
least 50 mm must be maintained to grounded parts above and below.
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