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

Page: 149 / 252

MAINTENANCE
Troubleshooting
149
occ
(5)
Short Circuit
Short-circuit is detected between upper bridge and lower bridge of the IGBT module
Action and Reset
Action level Hardware protection
Action time Immediately
Reset method Manually
Reset condition Reset in 5 sec. after the fault is cleared
Recorded Yes
Possible Causes Corrective Action
• IGBT Error
• Short-circuit detecting circuit error • Check the motor wiring.
• Cycle the power, if occ still exists, contact technical support.
Fault Display Description
ocd (2)
Oc at decel
Output current exceeds 2.4 times of rated current during deceleration.
Action and Reset
Action level 240% of rated current
Action time Immediately
Related parameters
[ADV-06]
;
[PROT-07]
;
[MOTOR-17]
Reset method Manually
Reset condition Reset in 5 sec after the fault is cleared
Recorded Yes
Possible Causes Corrective Action
• 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
• Check if the setting of stall prevention
is correct
• Increase the deceleration time
• Increase the deceleration 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 action timing of the mechanical brake
• 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 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 V/F curve settings 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.
• Increase AC motor drive’s capacity Install AC reactor(s) on the output side (U/V/W)
• The ocd occurs due to 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; Earth Ground corresponds to U, V and W. If short cir -
cuits occur, call Technical Support.
•
Set the stall prevention to the proper val
ue.
Fault Display Description