REXROTH EFC 3600 - Diagnosis on Errors; Error Description and Solution

9.5 Diagnosis on Errors
9.5.1 Error Description and Solution
When EFC 3600 detects a status or situation that affects or prevents correct op-
eration, an error message will be generated, as shown below:
OC-1: Overcurrent at constant speed
Possible reason Solution
Sudden load change in run mode Reduce occurrence and scale of sudden change
Low mains voltage Check input power supply
Motor power and frequency con-
verter power do not match
Motor power has to match with frequency converter power
Excessive inertia or load Check power of motor and frequency converter, check load
The motor cable is too long
● Decrease the carrier frequency
● Use a frequency converter with larger power
Excessive torque compensation Reduce voltage boost setting till the current decreases
OC-2: Overcurrent during acceleration
Possible reason Solution
Excessively short acceleration time Increase acceleration time
Excessive start-up frequency Reduce start-up frequency
Excessive load rotation inertia or
impact
Increase acceleration time, reduce sudden load change
Running command active while mo-
tor is coasting
Restart after motor stop or start with tracing speed ([b1.30]=2)
Wrong V/F curve setting Adjust V/F curve
Motor power and frequency con-
verter power do not match
Motor power has to match with frequency converter power
Excessive torque compensation Reduce voltage boost setting till the current decreases
Wrong motor parameters setting Correct motor parameters setting
OC-3: Overcurrent during deceleration
Possible reason Solution
Excessively short deceleration time Increase deceleration time
Excessive load rotation inertia Use suitable brake components
Motor power and frequency con-
verter power do not match
Motor power has to match with frequency converter power
Bosch Rexroth AG
Diagnosis
EFC 3600
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DOK-RCON03-EFC-3600***-IT03-EN-P