13.4.15 Error 23 (FF): Fan Failure
Possible reason
Solution
Fan defect
Contact with service
13.4.16 Error 24 (Pdr): Pump Dry
Possible reason
Solution
PID feedback is excessively low while con-
verter is running at output frequency high
limit
● Check if the feedback signal is valid
● If the PID control is used for controlling a water pump,
check if the pump is running without water
13.4.17 Error 25 (CoL-): Command Value Lost
Possible reason
Solution
Command value lost
Contact with service
13.4.18 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 con-
stant (C1.74)
Low mains voltage
Check input power supply
Wrong settings of V/f curve related param-
eters
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 frequen-
cy converter
Connect only one motor to the frequency converter
Excessive overexcitation braking factor
Reduce [E0.55]
Wrong motor protection parameter set-
tings
Adjust settings of C1.74, C1.75 and C1.76 according to
actual motor situations
Bosch Rexroth AG
Diagnosis
VFC 3210
180/253
DOK-RCON04-VFC3210****-IT01-EN-P