Emerson FM-3 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 10)

“c” Stall Foldback

A “c” indicates Stall Foldback in the display window on the EN/EB/EI drives. This is not

a fault and the drive will continue to operate. This display indicates that the current

command to the motor is 80% of the rated stall current. Motor torque and drive current

are reduced until the motor commanded velocity exceeds 100 RPM or the torque demand

is reduced.

This is done to protect the IGBT’s from excessive power loss due to a combination of

slow motor speed and high torque. IGBT’s can overheat under these conditions unless

current is reduced.

Potential Causes for Stall Foldback

• Sustained high current demand at low speed

• Wrong motor selected for configuration

• High inertia mismatch

• RST Motor phases incorrectly wired

• Tuning parameters not optimized

• Torque is commanded when machine path is blocked or stopped.

Notes

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Emerson FM-3 Anleitung zur Fehlerbehebung Seite 10