Possible reason Solution
Over excitation Reduce [b1.45]
Wrong motor parameter setting Correct motor parameters setting
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 capacitors overcharged
Check motor connection
Excessive load rotation inertia Use suitable brake components
Noise interference Check wiring of control circuit, main circuit and grounding
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 capacitors overcharged
Check motor connection
Direct start during motor running Restart after motor stop or start with tracing speed ([b1.30]=2)
Excessively short acceleration time
Increase acceleration time (b1.20) or use S-curve
(b1.22~b1.24)
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 (b1.21)
● Use a brake resistor or a dynamic brake resistor unit
● Enable stall overvoltage prevention during deceleration
([E4.01]=1)
Wrong wiring of brake resistor Check the wiring
The brake chopper is damaged Contact with service
EFC 3600 Bosch Rexroth AG
Diagnosis
DOK-RCON03-EFC-3600***-IT03-EN-P
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