E1 Series Servo Drive User Manual Troubleshooting And Maintenance
13-18 HIWIN MIKROSYSTEM CORP.
Warning Number
And Warning Name
Cause Confirmation Method Corrective Action
AL.945
Torque limit warning
Torque command exceeds
the torque limit value.
Check if the torque limit
value is too small.
Adjust torque limit value.
AL.946
Encoder
communication
warning
The encoder communication
is interferred or the encoder
cable disconnects.
Check if there is interference
source or the encoder cable
is correctly connected. Or
the connection is poor.
replace the encoder
cable.
(2) Check if the encoder
cable is correctly
AL.971
Undervoltage
supply is below 140 V.
Measure the voltage of AC
power supply.
Adjust the voltage of the AC
power supply to the specified
The power supply voltage
drops during operation.
Measure the power supply
voltage.
Increase power supply
capacity.
Momentary power
interruption occurs.
Measure the power supply
voltage.
Provide stable power supply.
The fuse of the servo drive is
blown out.
N/A
malfunction, please replace
Overtravel detected
when servo ON
(P-OT or N-OT
Overtravel signal (P-OT or
N-OT signal) is detected
when servo on.
Check the status of
overtravel signals via
Thunder.
(1) Check the wirings for
overtravel signals.
(2) Adopt countermeasure
against interference.
AL.9A1
P-OT signal is
received.
P-OT signal is detected
when servo off.
Check the status of
overtravel signal via
Thunder.
(1) Check the wirings for
overtravel signals.
(2) Adopt countermeasure
AL.9A2
N-OT signal is
received.
N-OT signal is detected
when servo off.
Check the status of
overtravel signal via
Thunder.
(1) Check the wirings for
overtravel signals.
(2) Adopt countermeasure
AL.9F0
Main circuit
overvoltage
The motor velocity is too
high.
Check motion command and
motor velocity.
Adjust load or operating
condition.
The voltage of the main
power supply is too low.
Check the voltage of the AC
power supply.
Adjust the voltage of the AC
power supply to the specified
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