Delta MS300 Series User Manual page 633

Chapter 14 Fault CodesMS300
ID Display on LCD Keypad
135
Action Condition
Action Time
Fault Treatment Parameter
Reset Method
Reset Condition
Record
Cause
The load is too large
Accel. /Decel. time or the working
cycle are too short
V/F voltage is too high
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.
When using VFD dedicated motor,
Pr.06-13 = 0 (electronic thermal
relay selection motor 1 = inverter
motor)
Incorrect value of electronic
thermal relay
The maximum motor frequency is
set too low
One drive to multiple motors
Check if the setting for stall
prevention is correct.
Torque compensation is too large
Motor fan error
Unbalanced three-phase
impedance of the motor
Fault Name
Internal communication
error
(EoL4)
Action and Reset
Start counting when the output current > 105% of the motor 4 rated current.
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)
N/A
Manual reset
Reset in five seconds after the fault is cleared
Yes
Reduce the load.
Increase the setting value for Pr.01-12–01-19 (accel./ decel. time)
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).
Decrease low-speed operation time.
Replace the drive with a dedicated to VFD model.
Increase the motor capacity.
Pr.14-82 = 1 electronic thermal relay selection motor 1 = standard motor (motor
with fan on the shaft).
Reset to the correct motor rated current.
Reset to the correct motor rated frequency.
Set Pr.14-82 electronic thermal relay 4 selection = 2 disable, and install thermal
relay on each motor.
Set the stall prevention to the proper value.
Adjust the torque compensation (refer to Pr.07-75 torque compensation gain)
until the current reduces and the motor does not stall.
Check the status of the fan, or replace the fan.
Replace the motor.
624
Fault Descriptions
Electronic thermal relay 4 protection. The drive coasts to
stop once it activates.
Corrective Actions