Additional instructions for permanent magnet motor drives
￭ Safety in installation, start-up, maintenance
These are additional warnings concerning permanent magnet motor drives. The other safety
instructions in this chapter are also valid.
WARNING!
Obey these instructions. If you ignore them, injury or death and damage to the
equipment can occur.
• Do not do work on the drive when a rotating permanent magnet motor is connected to
it. A rotating permanent magnet motor energizes the drive including its input and output
power terminals.
Before installation, start-up and maintenance work on the drive:
•
Stop the drive and do the steps in section Electrical safety precautions (page 14).
• Disconnect the motor from the drive with a safety switch or by other means.
• If you cannot disconnect the motor, make sure that the motor cannot rotate during work.
Make sure that no other system, like hydraulic crawling drives, can rotate the motor
directly or through any mechanical connection like felt, nip, rope, etc.
• Measure that the installation is de-energized.
• Use a multimeter with an impedance of at least 1 Mohm.
• Make sure that the voltage between the drive output terminals and the grounding
(PE) busbar is close to 0 V.
• Make sure that the voltage between the drive input power terminals and the
grounding (PE) busbar is close to 0 V.
• Make sure that the voltage between the drive DC terminals (if any) and the grounding
(PE) terminal is close to 0 V.
• Install temporary grounding to the drive output terminals (U2, V2, W2). Connect the
output terminals together as well as to the PE.
During the start up:
• Make sure that the motor cannot be run into overspeed, eg, driven by the load. Motor
overspeed causes overvoltage that can damage or destroy the capacitors in the
intermediate circuit of the drive.
￭ Safety in operation
WARNING!
Make sure that the motor cannot be run into overspeed, e.g. driven by the load.
Motor overspeed causes overvoltage that can damage or destroy the capacitors
in the intermediate circuit of the drive.
Safety instructions 17
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