34 ACS550-02/U2 User’s Manual
Installation
IT (ungrounded) systems
The drive is suitable for IT (ungrounded) systems, but you have to disconnect the
EMC filter (frame size R7) and varistor (frame sizes R7 and R8) before connecting
the drive to an IT system. See the following sections for how to do this.
• Disconnecting the EMC filter on IT (ungrounded) and corner grounded TN
systems (frame size R7 only) on page 44
• Disconnecting the varistor on IT (ungrounded) and corner grounded TN systems
(frame size R7) on page 45
• Disconnecting the varistor on IT (ungrounded) and corner grounded TN systems
(frame size R8) on page 46
WARNING! If a drive with its EMC filter (frame size R7) or varistor (frame sizes R7
and R8) connected is installed on an IT system [an ungrounded power system or a
high resistance-grounded (over 30 ohm) power system], the system will be
connected to earth potential through the EMC filter capacitors or varistor. This may
cause danger or damage the drive.
Required tools
• set of screw drivers
• torque wrench with 500 mm (20 in) or 2 x 250 mm (2 x 10 in) extension bar
• 19 mm (3/4 in) socket
for frame size R7: 13 mm (1/2 in) magnetic end socket
for frame size R8: 17 mm (11/16 in) magnetic end socket.
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