Franklin Electric CERUS X-DRIVE CXD-003A-4V, Installation And Operation Manual

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MAINTENANCE
Troubleshooting
148
ocA
(1)
Oc at accel
Output current exceeds 2.4 times of rated current during acceleration
Action and Reset
Action level 240% of rated current
Action time Immediately
Related parameters [ADV-06] ; [PROT-07] ; [PROT-39] ; [PROT-42] ; [MOTOR-05] ; [MOTOR-17]
Reset method Manually
Reset condition Reset in 5 sec after the fault is cleared
Recorded Yes
Possible Causes Corrective Action
• 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
• Malfunction caused by interference
• The motor starts when in free run
• Improper parameter settings for the
speed tracking function (including
restart after momentary power loss
and restart after fault)
• Incorrect combination of control
mode and used motor
• The length of motor cable is too long
• Hardware failure
• Check if the setting for stall
prevention is correct
• Increase the acceleration time
• Increase the acceleration time of S curve
• Set auto-acceleration and auto-deceleration parameter
[ADV-06]
• Set over-current stall prevention function [PROT-07]
• Replace the drive with a larger capacity model.
• Check the motor cable and remove causes of the short circuits, or replace the cable before turn -
ing 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 be less than 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 V/F curve setting and frequency/voltage. When the fault occurs, and the frequency volt -
age is too high, reduce the voltage.
• Adjust the torque compensation (refer to [MOTOR-17] ) until the output current reduces and the
motor does not stall.
• Verify the wiring of the control circuit and wiring/grounding of the main circuit to prevent inter -
ference.
• Enable the speed tracking during start-up of [PROT-42] .
• Correct the parameter settings for speed tracking.
• Start the speed tracking function.
• Adjust the maximum current for
[PROT-39] speed search tracking.
• Check the settings for [MOTOR-05]
• Increase AC motor drive’s capacity. Install AC reactor(s) on the output side (U/V/W).
• The ocA occurs due to short circuit or ground fault at the output side of the drive. Check for pos
-
sible 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 circuit occur, call Technical Sup
-
port.
• Set the stall prevention to the proper value.
Fault Display Description