Emerson FM-3 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 25)

Motor Over Temperature Fault

This fault is indicated by the display showing a “M”. This indicates a fault involving

excessive motor temperature.

Potential causes for the “M” High DC Bus fault

• Motor thermal sense switch is open due to excessive heat build up in the motor.

• Flexing of a non-flex cable

• Improper wiring

• Defective thermal switch internally in the motor

• Noise

“M” “Motor Over Temperature Fault”

Motor Thermal

Switch open

due to excessive

internal heat

Allow Motor to cool

Approximately 30 mimutes

Flexing

of non Flex Cable

Improper Wiring

from Drive to Motor

Reconnect and Return to Service

Noise

Yes

Return to Service

Return to Factory

Yes

Defective

Motor Thermal

Switch

Check Routing

of Cables

Return to Service

Thermal Switch

Resets

Return to Factory

Return to Service

Replace Cable

Yes

"M" Fault

Motor Over Temperature

Check continuinty of

Motor Feedback cable pin A

Flex cable during test

Disconnect

Motor

Feedback Cable

Disconnect Motor Feedback Cable

at every connection point,

use ohmmeter to check

continuinty of Pin A in cable

If Flex cable try and Flex

Check Continuity pins T to A

of Motor Feedback Connector

MG/NT Motors

shall read short if switch is reset

Replace defective section

or entire Cable

End

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