Delta MS300 Series User Manual page 556

Digital Keypad KPMS-LE01
 Refer to setting of Pr.06-17–Pr.06-22 and Pr.14-70–14-73.
ID Display on LCD Keypad
1
Action Condition
Action Time
Fault Treatment Parameter
Reset Method
Reset Condition
Record
Cause
Acceleration time is too short
Short circuit at motor output due to
poor insulation wiring
Check for possible burnout or
aging insulation of the motor
The load is too large.
Impulsive change of the load
Use special motor or motor with
larger capacity than the drive
Use ON/OFF controller of an
electromagnetic contactor at the
output (U/V/W) of the drive
V/F curve setting error
Torque compensation is too large
Fault Name
Over-current during
acceleration
(ocA)
Action and Reset
300% of the rated current
Immediately act
N/A
Manual reset
Reset in five seconds after the fault is cleared
Yes
1. Increase the acceleration time
2. Increase the acceleration time of S-curve
3. Set auto-acceleration and auto-deceleration parameter (Pr.01-44)
4. Set over-current stall prevention function (Pr.06-03)
5. Replace the drive with a larger capacity model.
Check the motor cable and remove causes of the short circuits, or replace the
cable before turning on the power.
Check the motor insulation value with megger. Replace the motor if the
insulation is poor.
Check if the output current during the whole working process exceeds the AC
motor drive's rated current. If yes, replace the AC motor drive with a larger
capacity model.
Reduce the load or increase the capacity of AC motor drive.
Check the motor capacity (the rated current on the motor's nameplate should ≤
the rated current of the drive)
Check the action timing of the contactor and make sure it is not turned ON/OFF
when the drive outputs the voltage.
Adjust the V/F curve setting and frequency/voltage. When the fault occurs, and
the frequency voltage is too high, reduce the voltage.
Adjust the torque compensation (refer to Pr.07-26 torque compensation gain)
until the output current reduces and the motor does not stall.
547
Fault Descriptions
Output current exceeds three times of the rated current
during acceleration.
When ocA occurs, the drive closes the gate of the
output immediately, the motor runs freely, and the
display shows an ocA error.
Corrective Actions
Chapter 14 Fault CodesMS300