Additional instructions for permanent magnet motor drives￭ Safety in installation, start-up, maintenanceThese are additional warnings concerning permanent magnet motor drives. The other safetyinstructions in this chapter are also valid.WARNING!Obey these instructions. If you ignore them, injury or death and damage to theequipment can occur.• Do not do work on the drive when a rotating permanent magnet motor is connected toit. A rotating permanent magnet motor energizes the drive including its input and outputpower 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 motordirectly 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 thegrounding (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 theoutput 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. Motoroverspeed causes overvoltage that can damage or destroy the capacitors in theintermediate circuit of the drive.￭ Safety in operationWARNING!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 capacitorsin the intermediate circuit of the drive.Safety instructions 17
