E.OP fault in KEB COMBIVERT R6 Drive indicates an Overpotential (overvoltage) condition. This means the regen unit is unable to feed energy back to the line, causing the DC bus voltage to rise dangerously high.
Cause:
Regen unit is unable to regen back to the line; CP.1 status is not in ‘regen’ status during generating operation.
- Enable input not present (CP.1 Status = nop).
- Input logic not set correctly to recognize enable input (i.e. di.00 = PNP vs. NPN).
- Regen unit in active fault.
- DC bus fuse(s) open.
Remedy:
Verify enable input at X2A.12. When active under normal operation, the CP.1 status should be either ‘Stby’ or ‘rEgEn’.
Verify di.00 setting according to input type (PNP: inputs must be +24VDC to be active; NPN: inputs must be at 0VDC to be active).
CP.1 status displays fault message or if the fault message has been cleared from the screen by pressing ENTER on the operator keypad, a flashing red indicator LED on the keypad and R6 indicates an active fault remains. Reset (2AX.13) or resolve the cause of the fault.
If the fault has been automatically reset, the last fault can be viewed in the fault log, CP.21. If it is unclear whether a fault actually occurred, refer to the note under CP.21…28 to force a specific fault in order to determine if a new fault is occurring.
The DC bus fuse(s), internal to the R6, can be checked visibly whether they are open and replaced as needed. Before checking, ensure all safety measures necessary including powering down the unit from the mains disconnect and locking it out and allowing the DC bus to fully dissipate and verifying 0VDC across the DC bus terminals ++, – -.
