8 Fault Types and Solutions
Fault No.
Fault name
and code
Possible reason Solution
1
Over current
at constant speed
(O.C.-1)
1. Discontinuous or abnormal load in run
mode
1. Check load
2. Low mains voltage
2. Check voltage of input power supply:
3P 380...480 VAC (-15 % / +10 %)
3. Motor power and converter power do not
match
3. Motor power has to match with converter power
4. Too large inertia or load 4. Check motor power, converter power, load
5. Pulse encoder fault 5. Check pulse encoder and its connection
2
Over current
during acceleration
(O.C.-2)
1. Too large start frequency 1. Reduce start frequency
2. Too large load rotation inertia, too large
impact load
2. Increase acceleration time, reduce sudden load
change
3. Improper motor parameter setting
3. Set motor parameters properly or auto tune motor
parameters (group S2)
4. Direct start during motor running
4. Restart after motor stop, or start with rotation speed
capture (group b1)
5. Too short acceleration time 5. Increase acceleration time
6. Motor power and converter power do not
match
6. Motor power has to match with converter power
7. Pulse encoder fault 7. Check pulse encoder and its connection
8. Improper V/F curve 8. Adjust V/F curve setting and torque increase
3
Over current
during deceleration
(O.C.-3)
1. Improper motor parameter setting
1. Set motor parameters properly or auto tune motor
parameters (group S2)
2. Too large load rotation inertia 2. Use suitable brake components
3. Too short deceleration time 3. Increase deceleration time
4. Motor power and converter power do not
match
4. Motor power has to match with converter power
5. Pulse encoder fault 5. Check pulse encoder and its connection
4
Over voltage
at constant speed
(O.E.-1)
1. Acceleration / deceleration time is too
short
1. Increase acceleration/ deceleration time
2. Abnormal input power supply 2. Check input power supply
3. Too much load change 3. Use suitable brake components
4. Improper speed loop parameter setting in
vector control
4. Adjust PI parameters of speed loop (group S1)
DOK-RCON02-FV*********-IB08-EN-P Bosch Rexroth AG 165/259
Rexroth Frequency Converter Fv
Fault Types and Solutions
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