Capacitors To Improve The Power Factor; Maximum Cable Length - Siemens SIRIUS 3RW30 Manual

Installation / mounting

9.5 Capacitors to improve the power factor

9.5 Capacitors to improve the power factor
Risk of property damage
No capacitors must be connected to the output terminals of the soft starter. If so, the soft
starter will be damaged.
Active filters, e.g. for power factor correction, must not be operated parallel to the motor
control device.
If capacitors are to be used to correct the power factor, they must be connected on the
device's line side. If an isolating or main contactor is used together with the electronic soft
starter, the capacitors must be disconnected from the soft starter when the contactor is open.
9.6

Maximum cable length

The cable between the soft starter and the motor must not be more than 300 m long (3RW30
and 3RW40).
The voltage drop due to the length of the cable to the motor may need to be considered
when dimensioning the cable.
Cable lengths up to 500 m are permitted for SIRIUS 3RW44 soft starters (refer to the 3RW44
System Manual (http://support.automation.siemens.com/WW/view/de/21772518)).
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CAUTION
SIRIUS 3RW30 / 3RW40
Manual, 10/2018, NEB535199502000/RS-AB/005