34 Mentor MP Short Form Guide
www.controltechniques.com Issue Number: 5
4 Electrical installation
Electric shock risk
The voltages present in the following locations can cause severe electric shock and
may be lethal:
• AC supply cables and connections.
• DC cables, and connections.
• Many internal parts of the drive, and external option units.
Unless otherwise indicated, control terminals are single insulated and must not be
touched.
Isolation device
The AC supply must be disconnected from the drive using an approved isolation
device before any cover is removed from the drive or before any servicing work is
performed.
STOP function
The STOP function does not remove dangerous voltages from the drive, the motor or
any external option units.
Drives are suitable for use on supplies of installation category III and lower, according
to IEC 60664-1. 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.
For details on the MOV ground (earth) disconnect, refer to the Mentor MP User Guide.
For details on the external suppressor resistor connections, refer to the Mentor MP
User Guide.
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