14.4.4
Error 4 (OE-1): Overvoltage at Constant Speed
Possible reason
Solution
Surge voltage from power supply
Check input power supply
Motor to earth short circuit causes DC-bus ca‐
pacitors overcharged
Check motor connection
Excessive load rotation inertia
Use suitable brake components. Information about external EFC brake
choppers you can find in R912007235
Noise interference
Check wiring of control circuit, main circuit and grounding
14.4.5
Error 5 (OE-2): Overvoltage during Acceleration
Possible reason
Solution
Surge voltage from power supply
Check input power supply
Motor to earth short circuit causes DC-bus ca‐
pacitors overcharged
Check motor connection
Direct start during motor running
Restart after motor stop or start with speed capture (E0.35)
Excessively short acceleration time
Increase acceleration time (E0.26) or use S-curve (E0.25, E0.28, E0.29)
14.4.6
Error 6 (OE-3): Overvoltage during Deceleration
Possible reason
Solution
Surge voltage from power supply
Check input power supply
Motor to earth short circuit causes
DC-bus capacitors overcharged
Check motor connection
Excessive load rotation inertia
Use suitable brake components
Excessively short deceleration time
● Increase deceleration time (F3.22)
● Use a brake resistor or a brake resistor unit
● Enable stall overvoltage prevention during deceleration (C0.25)
Wrong wiring of brake resistor
Check the wiring of brake resistor. Information about external EFC brake
choppers you can find in R912007235
The brake chopper is damaged
Contact with service
14.4.7
Error 7 (OE-4): Overvoltage during Stop
Possible reason
Solution
Excessive inertia on the load
● Increase deceleration time (F3.22)
● Use suitable brake components
Information about external EFC brake choppers you can find in
R912007235
Surge voltage from the power supply
Check input power supply
Bosch Rexroth AG
DOK-SYTROX-DRN5020****-IT05-EN-P
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Frequency-Controlled Pump Drive System Sytronix DRn 5020
Troubleshooting
