Delta VFD450C43S-21

Chapter 14 Fault Codes and DescriptionsC2000 Plus
14-5
ID* Display on LCD Keypad Fault Name Fault Descriptions
2
Over-current during
deceleration
(ocd)
Output current exceeds 2.4 times of 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 fault.
Action and Reset
Action condition 240% of rated current
Action time Act immediately
Fault treatment parameter N/A
Reset method Manual reset
Reset condition Reset in 5 sec. after the fault is cleared
Record Yes
Cause Corrective Actions
Deceleration time too short
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 if the mechanical brake of
the motor activates too early
Check the action timing of the mechanical brake
Short-circuit at motor output due to
poor insulation wiring
Check the motor cable and
remove causes of the short circuits, or replace the
cable before turning on the power.
Check for possible burnout or
aging insulation of the motor
Check the motor insulation
value with megger. Replace the motor if the insulation
is poor.
The load is too large
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.
Impulsive change of the load Reduce the load or increase the capacity of AC motor drive.
Use special motor or motor with
larger capacity than the drive
Check the motor capacity (the rated current on the motor’s nameplate should ≦
the rated current of the drive)
Use ON/OFF controller of an
electromagnetic contactor at the
output (U/V/W) 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.
V/F curve setting fault
Adjust V/F curve settings
and frequency/voltage. When the fault occurs, and the
frequency voltage is too high, reduce the voltage.
Torque compensation is too large
Adjust the torque compensation (refer to Pr.07-26
torque compensation gain)
until the output current reduces and the motor does not stall.
Malfunction caused by
interference
Verify the wiring of the control circuit and wiring/grounding of the main circuit
to
prevent interference.