ABB ACH550-02-645A-4 [57/454] Disconnecting the varistors on it unearthed and corner earthed tn systems

ABB ACH550-02-645A-4 [57/454] Disconnecting the varistors on it unearthed and corner earthed tn systems
Installing the drive 53
ACH550-02 User’s Manual
Disconnecting the varistors on IT (unearthed) and
corner-earthed TN systems
WARNING! If a drive with its varistors connected is installed on
an IT system [an unearthed power system or a high resistance-
earthed (over 30 ohm) power system], the system will be
connected to earth potential through the varistors. This may
cause danger or damage the drive.
If a drive with its varistors connected is installed on a corner-
earthed TN system, the drive will be damaged.
1. Ensure that the power is removed from the drive.
2. Remove the upper front cover by undoing the screws.
3. Disconnect the varistor cable from the board.
4. Disconnect the other end of the varistor cable.
5. Fasten the front cover.
3

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