Delta MS300 Series User Manual page 558

ID Display on LCD Keypad
2
Action Condition
Action Time
Fault Treatment Parameter
Reset Method
Reset Condition
Record
Cause
Deceleration time too short
Check if the mechanical brake of
the motor activates too early
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
Malfunction caused by
interference
The length of motor cable is too
long
Hardware error
Fault Name
Over-current during
deceleration
(ocd)
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 deceleration time
2. Increase the deceleration 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 action timing of the mechanical brake
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 settings 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.
Verify the wiring of the control circuit and the wiring/grounding of the main
circuit to prevent interference.
Increase the AC motor drive's capacity
Install AC reactor(s) on the output side (U/V/W)
The ocd occurs due to the short circuit or ground fault at the output side of the
drive.
Check for possible short circuits between terminals with the electric meter:
B1 corresponds to U, V and W; DC- corresponds to U, V and W;
corresponds to U, V and W.
If short circuits occurs, return to the factory for repair.
549
Fault Descriptions
Output current exceeds three times of the rated current
during deceleration.
When ocd occurs, the drive closes the gate of the
output immediately, the motor runs freely, and the
display shows an ocd error.
Corrective Actions
Chapter 14 Fault CodesMS300