Fault No.
Fault name
and code
Possible reason Solution
5
Over voltage
during acceleration
(O.E.-2)
1. Acceleration time is too short 1. Increase acceleration time
2. Abnormal input power supply 2. Check input power supply
3. Direct start during motor running
3. Restart after motor stop, or start with rotation speed
capture (group b1)
6
Over voltage
during deceleration
(O.E.-3)
1. Too large load rotation inertia 1. Use suitable brake components
2. Too short deceleration time 2. Increase deceleration time
7
Converter over load
(O.L.-1)
1. Long time over load
1. Reduce over load time, reduce load
Overload capability:
150 % of rated current for 60 s
180 % of rated current for 10 s
2. Improper V/F curve settings 2. Adjust V/F curve settings
3. Motor power and converter power do not
match
3. Motor power has to match with converter power
4. Improper motor parameters setting
4. Set motor parameters properly or auto tune motor
parameters (group S2)
5. Direct start during motor running
5. Restart after motor stop, or start with rotation speed
capture (group b1)
6. Low mains voltage 6. Check input power supply
7. Too short acceleration time 7. Increase acceleration time
8
Motor over load
(O.L.-2)
1. Motor locked 1. Prevent motor lock
2 Normal motor runs long time with heavy
load at low speed
2. Use variable frequency motor or increase converter
output frequency
3. Low voltage of input power supply 3. Check input power supply
4. Improper V/F curve settings 4. Adjust V/F curve setting and torque increase
5. Locked-rotor or sudden load increase 5. Check load
6. Improper setting of motor over load pro‐
tection factor
6. Adjust setting of motor over load protection factor
(group E4)
9
CPU read/ write
fault
(R.E.)
Fault or illegal data in control board read/
write
Contact with technical service
Bosch Rexroth AG DOK-RCON02-FV*********-IB08-EN-P166/259
Rexroth Frequency Converter Fv
Fault Types and Solutions
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