Error
code
Error name Possible reason Solution
O.L.
Motor
overload
Too large load, too short accel-
eration/ deceleration time or
cycle
Adjust the load, acceleration/ deceleration
time or cycle; or increase the frequency con-
verter capacity
Improper V/f characteristic
curve settings
Adjust V/f curve settings
Improper setting of electronic
thermal relay
Correctly set the parameters of electronic
thermal relay
O.H.
frequency
converter
overheat
Fan failure Check if fan works normally
Too high ambient temperature Lower the ambient temperature
Ventilation outlet obstructed
Clear dust and foreign matters at ventilation
outlet
d.r.
Drive
protection
Damaged power component
Replace power component and seek techni-
cal support
Incorrect operation of drive cir-
cuit protection
Remove interference and seek technical
support
CPU- EMI
CPU incorrect operation due to
external interference
Remove nearby interference or other EMI
IPH.L
Phase loss
at input side
Phase loss of the frequency
converter’s 3-phase input pow-
er supply
Check 3-phase input power supply or seek
technical support
oPH.L
Phase loss
at output
side
Open wire or phase loss of fre-
quency converter’s 3-phase
output power supply (severe
asymmetry of the 3-phase’s
loads)
Check frequency converter’s 3-phase wiring
(or symmetry of loads)
–
Motor fails
to start
Abnormal power supply voltage Check input power supply
External wiring between control
terminal SF or SR is disconnec-
ted
Check external wiring between control ter-
minal SF or SR
Improper parameter setting Check parameter setting
–
Motor can-
not run at
different
speeds
The highest frequency is too
low
Check the highest frequency
Improper frequency setting
mode
Confirm frequency setting mode
–
Motor stalls
during
acceleration
Too short acceleration time Increase acceleration time
Too large inertia of motor and
load
Adjust acceleration time
Bosch Rexroth AG
Error Indication
DOK-RCON01-FE*********-IN04-EN-P
27/31
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