Back EMF protection

Hva betyr 27 ?

The drive has detected that a magnetized motor is already rotating when a start command is issued. This is particularly relevant for Permanent Magnet (PM) motors which generate back electromotive force even when unpowered, making them appear 'active' during startup.

• Back EMF voltage exceeds the maximum limit during deceleration.
• Inadequate braking torque control.
• High inertia load causing over-speeding on power loss.
• Incorrect braking parameter settings (P1-25).
• External braking resistor not functioning correctly.

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1. 1

   Ensure that there is no rotating Permanent Magnet (PM) motor connected and spinning when the start command is given to the frequency converter.