14.4.17 Error 30 (OL-2): Motor Overload
Possible reason
Solution
Motor locked
Prevent motor lock
Normal motor runs long time with large load at low
speed
● Increase frequency converter output frequency
● Reduce load
● Use variable frequency motor or set zero speed load (C1.76) to a
higher value
● Set correct motor thermal model protection time constant (C1.74)
Low mains voltage
Check input power supply
Wrong settings of V/f curve related parameters
Adjust settings of V/f curve related parameters
Excessive sudden load change
Check load
Wrong input of rated motor current
Correct rated motor current in (C1.07)
Multiple motors are driven by one frequency con‐
verter
Connect only one motor to the frequency converter
Excessive overexcitation braking factor
Reduce [E0.55]
Wrong motor protection parameter settings
Adjust settings of C1.74, C1.75 and C1.76 according to actual motor
situations
14.4.18 Error 31 (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 sensor feedback signal
Wrong motor protection parameter settings
Different motor with different maximum temperature, set motor protec‐
tion parameters according to actual protection circuits (C1.72, C1.73,
C1.74)
14.4.19 Error 32 (t-Er): Motor Parameter Tuning Error
Possible reason
Solution
Motor power and frequency converter power do
not match
Motor power has to match with frequency converter power
Wrong setting of motor parameters
Correct motor parameters setting according to motor nameplate
No connection of converter and motor
Check motor cable connections
14.4.20 Error 33 (AdE-): Synchronous Motor Angle Detection Error
Possible reason
Solution
Internal error occurs during synchronous motor
angle detection
Contact with service
DOK-SYTROX-DRN5020****-IT05-EN-P
Bosch Rexroth AG
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Frequency-Controlled Pump Drive System Sytronix DRn 5020
Troubleshooting
