Ot: Motor over temperature
Possible reason Solution
Excessive load or bad cooling
● Check load
● Provide a better cooling condition
Temperature sensor defect Check the motor temperature feedback signal
Wrong protection level
Different motor with different maximum temperature, configure
external division circuit and set the protection level (S2.22)
CPUd: Main board CPU trap error
Possible reason Solution
CPU is disturbed by external noise and the
program runs to illegal address
Check the wiring of control circuit, main circuit and
grounding to find out the source of interference
Wrong parameters setting Set [b0.05] = 1 for parameters initialization
SC: Short circuit of IGBT
Possible reason Solution
External phase-phase short circuit of motor Check motor
Earth surge Remove the short circuit and check motor
Internal error of IGBT Contact with service
IPH.L: Input phase loss (for 3p frequency converter)
Possible reason Solution
Abnormal, omitted or broken connections of
frequency converter power supply
Follow operating procedures to check power supply
connections, remove omitted or broken connections
Broken fuse Check fuse
Imbalance in the three phases of input power
supply
Check if the imbalance situation exceeds requirements
Main circuit capacitor deterioration Contact with service
OPH.L: Output phase loss
Possible reason Solution
Abnormal, omitted or broken connections of
frequency converter outputs
Check the connections of frequency converter outputs,
remove omitted or broken connections
Imbalance in the three phases of outputs Check motor
Bosch Rexroth AG
Diagnosis
EFC 3600
130/259
DOK-RCON03-EFC-3600***-IT03-EN-P
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