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A911 alarm in siemens V20 Drive

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Cause : Vdc_max controller active comes when the Vdc_max controller works to keep the DC-link voltage (r0026) below the level specified in r1242.

Check the following:

• Supply voltage must lie within limits indicated on rating plate.
• Ramp-down time (P1121) must match inertia of load.

Note: Higher inertia requires longer ramp times; other- wise, apply braking resistor.

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