Veikong VFD500 Series Operation Manual page 97

Chapter 6 Fault diagnosis and solutions
Fault Name Display
By wave
current Er.CbC
limitingfault
Too large
speed Er.DEV
deviation
Motor
Er. oS
over-speed
Encoder offline Er.PGL
VFD500 high performance vector control frequency inverter user manual
Possible Causes
1: The load is too heavy or locked-
rotor occurs on the motor.
2: The frequency inverter model is of
too small power class
1: The encoder parameters are
setincorrectly.
2: The motor auto-tuning is
notperformed.
3: The detection parameters of toolarge
speed deviation are setincorrectly.
1: The encoder parameters are
setincorrectly.
2: The motor auto-tuning is
notperformed.
3: The over-speed detectionparameters
are set incorrectly
1. motor locked
2. encoder pulse setting wrong
3. encoder offline
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Solutions
1: Reduce the load and check
the motor and mechanical
condition.
2: Select a frequency inverter of
higher power class.
1: Set the encoder parameters
properly.
2: Perform the motor auto-tuning.
3: Set the detection parameters
correctly based on the
actualsituation.
1: Set the encoder
parametersproperly.
2: Perform the motor auto-tuning.
3: Set the over-speed detection
parameter correctly based on the
actual situation.
1 check motor and mechanical
condition
2 set correct parameter for encoder
3 check encoder connecting line