Delta VFD1A5MS43ANSAA User Manual

Chapter 14 Fault CodesMS300
602
ID
Display on LCD Keypad
Fault Name
Fault Descriptions
79
U-phase over-current
before run
(Aoc)
U-phase short circuit detected when the output wiring
detection is performed before the drive runs.
Action and Reset
Action Condition
300% of the rated current
Action Time
Immediately act
Fault Treatment Parameter
N/A
Reset Method
Manual reset
Reset Condition
Reset in five seconds after the fault clears
Record
Yes
Cause
Corrective Actions
Incorrect wiring for the motor
Check if the motor’s internal wiring and the UVW wiring of the drive output
terminal are correct.
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.
Malfunction caused by
interference
Verify the wiring of the control circuit and the wiring/grounding of the main
circuit to prevent interference.
The length of motor cable is too
long
Increase the AC motor drive’s capacity.
Install AC reactor(s) on the output side (U/V/W).
Hardware failure
The Aoc 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 circuit occurs, return to the factory for repair.

Delta VFD1A5MS43ANSAA Specifications

General

Brand	Delta
Model	VFD1A5MS43ANSAA
Category	DC Drives
Language	English