Chapter 14 Fault Codes and DescriptionsME300
14-22
Record Yes
Cause Corrective Actions
STO jumper cap is not installed or
is off.
Install the jumper cap.
External STO card S1 and +24 V
short circuit line are not connected.
Check the wiring of the S1 and +24 V terminals.
External STO card is installed
incorrectly or pin fractures.
Check if STO card is correctly installed.
Insufficient external input voltage Check that the input voltage maintains at least 11 V.
False trigger Reset the emergency switch (ON: activated) and cycle the power.
Hardware failure
fter you make sure all the wiring is correct, if STL2 fault still exists after cycling
the power, please contact Delta.
ID No. Display on LCM Keypad Fault Name Fault Descriptions
78
S3 internal loop
detection error
(STL3)
S1–DCM & S2–DCM internal loop detection error
Action and Reset
Action level Hardware detection
Action time Immediately act
Fault treatment parameter N/A
Reset method Hardware failure, and cannot reset. Cycle the power.
Reset condition N/A
Record Yes
Cause Corrective Actions
STO jumper cap is not installed or
is off.
Install the jumper cap.
Incorrect wiring of STO card
Check all the wiring of STO card.
External STO card is installed
incorrectly or pin fractures.
Check if STO card is correctly installed.
False trigger Reset the emergency switch (ON: activated) and cycle the power.
Hardware failure
fter you make sure all the wiring is correct, if STL3 fault still exists after cycling
the power, please contact Delta.
ID No. Display on LCM Keypad Fault Name Fault Descriptions
79
U-phase short circuit
(Aoc)
U-phase short circuit detected when output wiring
detection is performed before the drive runs.
Action and Reset
Action level 240% of the rated current
Action time Immediately act
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
Incorrect motor wiring
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.
Without considering the short circuits, check the motor cable 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 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 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, W; DC- corresponds to U, V, W;
corresponds to U,
V, W.
If short circuits occur, return to the factory for repair.
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