Operating Instructions

Fault Codes
Digital Keypad
348 | 443
may still occur during low-speed
operation.
● Increase the motor capacity.
When using VFD dedicated motor, Pr.06-
13=0 (electronic thermal relay selection
motor 1 = inverter motor)
Pr.14-80 = 1 electronic thermal relay selection motor 1 = standard motor (motor with fan on the
shaft).
Incorrect value of electronic thermal relay
Reset to the correct motor rated current.
The maximum motor frequency is set too
low
Reset to the correct motor rated frequency.
One drive to multiple motors
Set Pr.14-80 electronic thermal relay 3 selection = 2 disable, and install thermal relay on each
motor.
Check if the setting for stall prevention is
correct.
Set the stall prevention to the proper value.
Torque compensation is too large
Adjust the torque compensation (See Pr.07-73 torque compensation gain) until the current
reduces and the motor does not stall.
Motor fan error
Check the status of the fan, or replace the fan.
Unbalanced three-phase impedance of
the motor
Replace the motor.
ID*
Display on LCD Keypad
Fault Name
Fault Descriptions
135
Internal communication
error (EoL4)
Electronic thermal relay 4 protection. The drive coasts to stop once
it activates.
Action and Reset
Action level
Start counting when the output current > 105% of the motor 4 rated current.
Action time
Pr.14-83 (If the output current is larger than 105% of motor 4 rated current again within 60 sec.,
the counting time reduces and is less than Pr.14-83)
Fault treatment parameter
N/A
Reset method
Manual reset
Reset condition
Reset in five seconds after the fault is cleared
Record
Yes
Cause
Corrective Actions
The load is too large
Reduce the load.
Accel. /Decel. time or the working cycle
are too short
Increase the setting value for Pr.01-12–01-19 (accel./ decel. time)
V/F voltage is too high
Adjust the settings for Pr.01-62–01-70 (V/F curve), especially the setting value for the mid-point
voltage (if the mid-point voltage is set too low, the load capacity decreases at low speed).
Overload during low-speed operation.
When using a general motor, even it
operates below rated current, an overload
may still occur during low-speed
operation.
● Decrease low-speed operation time.
● Replace the drive with a dedicated to VFD model.
● Increase the motor capacity.
When using VFD dedicated motor, Pr.06-
13=0 (electronic thermal relay selection
motor 1 = inverter motor)
Pr.14-82 = 1 electronic thermal relay selection motor 1 = standard motor (motor with fan on the
shaft).
Incorrect value of electronic thermal relay
Reset to the correct motor rated current.
The maximum motor frequency is set too
low
Reset to the correct motor rated frequency.