Drive faults when slowing down or stopping — regenerated energy has nowhere to go.
1
Deceleration ramp too aggressive
medRotary screw
CheckRead the decel time parameter and compare to OEM default; note whether the fault always occurs on stop.
FixExtend decel time, or enable coast-to-stop where the OEM allows it.
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2
High incoming line voltage
medCheckLog supply voltage over a shift — off-peak line rise is common.
FixAdjust transformer taps or fit a line reactor; verify the drive's input voltage rating covers the site maximum.
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3
Missing or failed braking resistor
medCheckCheck the resistor for open circuit and burnt/discoloured elements; verify the brake chopper is enabled.
FixReplace the resistor and confirm brake transistor operation.
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4
Load driving the motor (high-inertia airend coasting)
medRotary screw
CheckConfirm blowdown opens on stop so the airend is unloaded during decel.
FixRepair the blowdown valve or solenoid so the airend is vented before the ramp down.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.