OL-1: Frequency converter overload
Possible reason Solution
Long time overload Reduce overload time, reduce load
Excessive proportion of V/F curve Adjust V/F proportion and torque boost
Motor power and frequency con-
verter power do not match
Motor power has to match with frequency converter power
Overload happens at lower speed
● Reduce load at lower speed
● Reduce the carrier frequency (b0.21)
● Use a frequency converter with larger power
Excessive load, excessive short
Acc./Dec. time or cycle
● Adjust load, acceleration/deceleration time or cycle
● Use a frequency converter with larger power
Low mains voltage Check input power supply
Excessive torque compensation Reduce voltage boost setting till the current decreases
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 (b1.04 or po-
tentiometer)
● Reduce load
● Use variable frequency motor or set zero speed load (E4.05)
to a higher value
● Set correct thermal motor time constant (S2.23)
Low mains voltage Check input power supply
Excessive proportion of V/F curve Adjust V/F proportion and voltage boost
Excessive sudden load change Check load
Wrong input of rated motor current Correct rated motor current in S2.04
Multiple motors are driven by one
frequency converter
Connect only one motor to the frequency converter
Over excitation Reduce [b1.45]
Wrong motor overload curve at low
speed
Adjust settings of S2.23, E4.04 and E4.05 according to actual
motor situations
Bosch Rexroth AG
Diagnosis
EFC 3600
128/259
DOK-RCON03-EFC-3600***-IT03-EN-P
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