Fault No.
Fault name
and code
Possible reason Solution
10
Operating panel
read/write fault
(KEY-)
Fault or illegal data in operating panel read/
write
Contact with technical service
11
External
device fault
(E.-St)
External fault caused by input signals via
external terminals
Check external terminals status, check respective rea‐
son to fault
12
Communication
fault
(R.S.)
1. Device connection problem 1. Check device communication connection
2. Improper baud rate setting 2. Set proper baud rate
13
Circuit
disconnection
(C.F.)
Current detection channel abnormal Contact with technical service
14
Pulse encoder
speed detection fault
(PULS)
1. Pulse encoder fault
1. Check operations of mechanical part and electrical
part of encoder, power supply and connections
2. Pulse encoder connection problem 2. Replace encoder connection cable
3. Improper setting of pulse encoder 3. Set parameters related to pulse encoder properly
15
Motor
overheat
(M.O.H.)
1. Continuous low speed running for a long
time
1. Use a special motor
2. Over load 2. Reduce over load time, reduce load
3. Temperature sensor fault
3. Replace the temperature sensor or contact with
technical service
16
EMI
fault
(CPU-)
CPU malfunction due to external interfer‐
ence
Remove environmental interference or EMI
17
Short
circuit
(S.C.)
1. Too large output current
1. Check if motor short circuit, motor to earth short cir‐
cuit, over load exists
2. Power component fault 2. Contact with technical service
18 Reserved
19
L1, L2, L3 input
phase loss
(IPH.L)
1. Abnormal, omitted or broken connection
of converter power supply
1. Follow operating procedures to check power supply
connections, remove omitted or broken connections
2. Broken fuse 2. Check fuse
3. Imbalance in the three phases of input
power supply
3. Check installation wiring and input voltage
DOK-RCON02-FV*********-IB08-EN-P Bosch Rexroth AG 167/259
Rexroth Frequency Converter Fv
Fault Types and Solutions
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