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12 Fault Code and Countermeasures
248 SD780 Series Servo Technical Manual
Er.D02
Excessive position
deviation alarm
caused by speed
limit during servo
ON
Set correct Maximum position deviation threshold (Pn264) or set correct speed
limit value (Pn270) during servo ON.
Er.D10
Excessive deviation
between motor and
load position
1. Confirm the rotation direction of the motor and the installation direction of the
external encoder.
2. Check the mechanical installation.
3. Set the parameter Pn250 to the correct value.
12.2 Warning Code
Warning
code
Type
Solutions
AL.90
0
Excessive Position
deviation warning
1. Correctly set relevant parameters such as gear ratio, gain, position filtering,
torque limit, etc.
2. confirm the encoder line motor wiring is correct.
3. If you already exclude various reasons, the servo driver may malfunction and
you could consider replacing the servo unit.
AL.90
1
Excessive position
deviation warning
during servo ON
Set correct excessive position deviation value during servo ON.
AL.91
0
Overload warning
1. Check if there is any problem of the motor wiring and encoder wiring.
2. Incorrect motor or driver selection.
AL.91
1
Vibration warning
1. Reduce the motor speed or reduce the speed loop gain.
2. Set the moment of inertia ratio correctly.
AL.92
0
Regeneration
overload warning
1. Set the power supply voltage within the specification range.
2. Set resistance value and capacity correctly.
3. Replace the servo drive because of servo driver failure.
AL.92
1
DB overload
warning
1. Reduce the servo motor command speed.
2. Reduce the rotary inertia ratio.
3. Replace the servo drive because of servo driver failure.
AL.93
0
Battery under-
voltage warning
Replace the battery.
AL.94
1
Parameter change
warning needed to
re-power off
Power down the drive before restart it.
AL.97
1
Under-voltage
warning
1. Adjust the AC/DC power supply voltage to the product specifications.
2. increase the power capacity.
AL.9A
0
Servo overtravel
1. Connect the overtravel signal correctly.
2. Confirm the accuracy of the operating instructions of the host computer
device.