26 Digitax ST Installation Guide
Issue: 7
4.1 Supply types
All drives are suitable for use on any supply type i.e TN-S, TN-C-S, TT and IT.
Supplies with voltage up to 600 V may have grounding at any potential, i.e. neutral,
centre or corner (“grounded delta”)
Supplies with voltage above 600 V may not have corner grounding
Drives are suitable for use on supplies of installation category III and lower, according to
IEC60664-1. This means they may be connected permanently to the supply at its origin
in a building, but for outdoor installation additional over-voltage suppression (transient
voltage surge suppression) must be provided to reduce category IV to category III.
Permanent magnet motors
Permanent magnet motors generate electrical power if they are rotated, even when the
supply to the drive is disconnected. If that happens then the drive will become energized
through its motor terminals.
If the motor load is capable of rotating the motor when the supply is disconnected, then
the motor must be isolated from the drive before gaining access to any live parts.
If the drive is to be used on an IT (ungrounded) supply, refer to the Digitax ST User Guide
for more information.
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