14.4.8
Error 8 (UE-1): Undervoltage during Run
Possible reason
Solution
Power failure during running
Check input power supply
Main circuit capacitor deterioration
Contact with service
14.4.9
Error 9 (SC): Surge Current or Short Circuit
Possible reason
Solution
External phase-phase short circuit of motor
Check motor wiring
Earth surge
Remove the short circuit and check motor
Internal error of power module
Contact with service
Surge current
Increase the acceleration time (E0.26), reduce the overexci‐
tation braking factor (E0.55)
14.4.10 Error 10 (IPH.L): Input Phase Loss
Possible reason
Solution
Abnormal, omitted or broken connections
of frequency converter power supply
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 converter with‐
stand capability
Main circuit capacitor deterioration
Contact with service
14.4.11 Error 11 (OPH.L): Output Phase Loss
Possible reason
Solution
Abnormal, omitted or broken connections
of frequency converter outputs
Check the connections of frequency converter outputs, re‐
move omitted or broken connections
Imbalance in the three phases of outputs
Check motor
14.4.12 Error 12 (ESS-): Soft Start Error
Possible reason
Solution
Soft start resistor value has been changed
due to over temperature
Contact with service
Power failure
Check the input power supply
Input phase loss occurs during start-up (3 phase)
Remove the input phase loss
Main circuit capacitor deterioration
Contact with service
DOK-SYTROX-DRN5020****-IT05-EN-P
Bosch Rexroth AG
127/143
Frequency-Controlled Pump Drive System Sytronix DRn 5020
Troubleshooting