Additional Instructions For Permanent Magnet Motor Drives; Safety In Installation, Start-Up And Maintenance - ABB ACH480 Hardware Manual

16 Safety instructions

Additional instructions for permanent magnet motor drives

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Safety in installation, start-up and maintenance

These are additional warnings that apply to 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 work on a drive when a rotating permanent magnet motor is connected
to it. A rotating permanent magnet motor energizes the drive including its input
power terminals.
Before installation, start-up and maintenance work on the drive:
• Stop the motor.
• 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 (T1/U, T2/V,
T3/W) and the grounding (PE) busbar is close to 0 V.
• Make sure that the voltage between the drive input power terminals (L1, L2,
L3) and the grounding (PE) busbar is close to 0 V.
• Make sure that the voltage between the drive DC terminals (UDC+, UDC-) and
the grounding (PE) terminal is close to 0 V.
• Install temporary grounding to the drive output terminals (T1/U, T2/V, T3/W).
Connect the output terminals together as well as to the PE.
Start-up and operation:
• Make sure that the operator cannot run the motor over the rated speed. Motor
overspeed causes overvoltage that can damage or explode the capacitors in the
intermediate circuit of the drive.