PrFÂ Power Removal Function Activated fault in Toshiba drive
PrF Power Removal Function Activated fault in Toshiba drive
Description PrF is a status trip similar to the STO function. It indicates that the "Power Removal" terminal (often labeled PWR) has been disconnected from the 24V source. This is a hardware interlock mandated by safety standards. Unlike a standard "Enable" input (which is software), PrF physically cuts the bias voltage to the output drivers. Causes
1. Emergency Switch: An external safety switch wired to the PWR terminal is open.
2. Jumper Bar: The shorting bar between P24 and PWR is missing (common during installation).
3. Loose Terminal: The screw tightening the safety input is loose. Solution Locate the PWR terminal on the control strip.
Measure voltage between PWR and CC (Common). You should see +24VDC. If you see 0V, the drive is in PrF state.
Trace the wire. If you have no external safety switch, you must install a jumper wire between P24 and PWR. Note: The drive will NOT reset if you simply re-apply 24V. You usually have to cycle the main power or toggle the Reset command *after* the safety input is restored.
Description PrF is a status trip similar to the STO function. It indicates that the "Power Removal" terminal (often labeled PWR) has been disconnected from the 24V source. This is a hardware interlock mandated by safety standards. Unlike a standard "Enable" input (which is software), PrF physically cuts the bias voltage to the output drivers. Causes
1. Emergency Switch: An external safety switch wired to the PWR terminal is open.
2. Jumper Bar: The shorting bar between P24 and PWR is missing (common during installation).
3. Loose Terminal: The screw tightening the safety input is loose. Solution Locate the PWR terminal on the control strip.
Measure voltage between PWR and CC (Common). You should see +24VDC. If you see 0V, the drive is in PrF state.
Trace the wire. If you have no external safety switch, you must install a jumper wire between P24 and PWR. Note: The drive will NOT reset if you simply re-apply 24V. You usually have to cycle the main power or toggle the Reset command *after* the safety input is restored.
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