CG Drives & Automation 01-5980-01r2 Application guidelines 37
4.4.11IT earthing system
Emotron TSA Softstarter is as standard equipped with
earthing system fulfilling the EMC requirements.
Distribution systems may be equipped with an IT isolated
earthing system, which allows for an earth fault to occur
without interruption of operation. For use in these systems,
the Emotron TSA should be configured for IT-net supply
type. The unit will then not fulfil the EMC requirements.
If you have a softstarter without IT net supply type, the
softstarter can be rebuilt. Contact your local CG Drives &
Automation service partner.
4.4.12Earth fault relay
It is possible to use an earth fault relay to protect motor and
cables. To avoid undesired tripping due to filter capacitor
charging currents, choose an RCD Type B rated for 300 mA
leakage current.
For Emotron SA size 1 and 2 (16 - 100A) there are no
capacitors to ground so the leakage current to ground is less
than 30 mA
4.4.13Other control voltage
The power board must be connected to 100-240 VAC single
phase control supply. If this is not available a transformer
must be used. This transformer should be connected as in
Fig. 27.
The transformer should be capable of supplying a power of
50 VA or more. This item is not included in the range of
CG options.
Fig. 27 Example of wiring when using transformer for 380 - 500 VAC
Transformer
Emotron TSA
100 - 240 VAC
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