Delta ASDA-B Servo Drive Fault Codes List

Access the complete reference guide for the legacy Delta ASDA-B servo drive. Learn to diagnose AL.xx alarms, pulse train errors, and replace aging encoder cables.

This guide provides the most updated reference for 2026 to help you troubleshoot these legacy workhorses and identify when an upgrade is necessary.

Delta ASDA-B Fault Codes Reference Table

Use the search bar below or browse the table to identify your specific error code.

ASDA-B Series Servo Drive Faults and Alarms

ASDA-B Series Troubleshooting

Fault Code and Meaning Cause and Remedy
ALE 1

Overcurrent		 Cause:
Short-circuit at drive output (U, V, W), Motor wiring error, IGBT error, or Heat sink overheated.

Remedy:
  • Check wiring connections between drive and motor for short circuits.
  • Repair short-circuited wires and avoid exposed metal conductors.
  • Follow wiring steps in the user manual to reconnect wiring.
  • If heat sink is overheated or hardware is damaged, contact distributor or Delta.
ALE 2

Overvoltage		 Cause:
Main circuit voltage exceeded maximum allowable value, Power input error (incorrect input), or Servo drive hardware damage.

Remedy:
  • Use voltmeter to check if input voltage is within rated specifications (refer to manual section 11.1).
  • Use correct power supply or stabilizing power.
  • If hardware is damaged after voltage check, contact distributor or Delta.
ALE 3

Undervoltage		 Cause:
Main circuit voltage below minimum value, No input voltage at main circuit, Power input error, or Hardware damage.

Remedy:
  • Check if main circuit input voltage wiring is correct.
  • Reconfirm power supply and switches; ensure input voltage is normal.
  • Use correct power supply or stabilizing power.
  • Contact distributor or Delta if hardware is damaged.
ALE 4

Z Pulse shift		 Cause:
Encoder is damaged or Encoder is loose.

Remedy:
  • Check Encoder for damage; repair or replace the motor.
  • Examine Encoder connector; install the motor again.
ALE 5

Regeneration error		 Cause:
Regenerative resistor not connected, Transistor for regeneration disabled/short-circuited, Parameter setting error, or Hardware damage.

Remedy:
  • Check wiring connection of regenerative resistor and reconnect if necessary.
  • Confirm parameter setting and specifications of regenerative resistor; reset parameter.
  • If transistor is short-circuited or hardware damaged, contact distributor or Delta.
ALE 6

Overload		 Cause:
Drive exceeded rated load, Control system parameter incorrect (Gain/Accel/Decel), Wiring error, Encoder damaged, or Incorrect U, V, W connection.

Remedy:
  • Check if drive is overloaded; increase motor capacity or reduce load.
  • Adjust gain value of control circuit if mechanical vibration exists.
  • Decrease Accel/Decel time setting.
  • Ensure all wiring (U, V, W and encoder) is correct.
  • Contact distributor if encoder is damaged.
ALE 7

Overspeed		 Cause:
Wiring of motor incorrect, Encoder damaged, Speed input command unstable, or Over-speed parameter setting defective.

Remedy:
  • Ensure all wiring of U, V, W and encoder is correct.
  • Ensure input command frequency is stable; activate filter function (P1-06, P1-07, P1-08).
  • Correctly set over-speed parameter setting (P2-34).
  • Contact distributor if encoder is damaged.
ALE 8

Abnormal pulse control command		 Cause:
Pulse command frequency is higher than rated input frequency.

Remedy:
  • Use pulse frequency detector to measure input frequency.
  • Correctly set the input pulse frequency.
ALE 9

Excessive deviation		 Cause:
Maximum deviation parameter too small, Torque limit too low, Overload, Gain value too small, or Too much fluctuation of pulse command.

Remedy:
  • Increase the parameter setting value of P2-35.
  • Correctly adjust torque limit value.
  • Correctly adjust gain value.
  • Reduce external applied load or re-estimate motor capacity.
  • Adjust pulse frequency and activate filter function (P1-06, P1-07, P1-08).
ALE 10

Serial communication error		 Cause:
Communication parameter setting defective, Communication address incorrect, or Communication value incorrect.

Remedy:
  • Check and correctly set communication parameter settings.
  • Check and correctly set communication address.
  • Check and correctly set communication value.
ALE 11

Encoder error (Position detector fault)		 Cause:
Wiring of encoder in error/defective, Encoder is loose, or Encoder is damaged.

Remedy:
  • Check if all wiring is correct according to user manual.
  • Check if connections are tight and conduct wiring again.
  • Examine encoder connector and install motor again.
  • If encoder is damaged, repair or replace the motor.
ALE 12

Adjustment error		 Cause:
Motor is running during adjustment, Analog input contact does not return to zero, or Detection device damaged.

Remedy:
  • Turn off the motor.
  • Measure voltage level of analog input; correctly ground analog input contact.
  • Check and reset the power supply.
  • Contact distributor if detection device is damaged.
ALE 13

Emergency stop activated		 Cause:
Emergency stop switch is activated.

Remedy:
  • Check if emergency stop switch is On or Off.
  • Activate (reset) emergency stop switch.
ALE 14

Reverse (CWL) limit switch error		 Cause:
Reverse limit switch is activated or Servo system is not stable.

Remedy:
  • Check if reverse limit switch is On or Off; activate switch.
  • Check control parameter setting and load inertia.
  • Modify parameter setting and re-estimate motor capacity.
ALE 15

Forward (CCWL) limit switch error		 Cause:
Forward limit switch is activated or Servo system is not stable.

Remedy:
  • Check if forward limit switch is On or Off; activate switch.
  • Check control parameter setting and load inertia.
  • Modify parameter setting and re-estimate motor capacity.
ALE 16
IGBT temperature error		 Cause: The drive has exceeded its rated load during continuous operation. (Check: Check if there is overload or the motor current is too high).

Remedy:
  • Increase motor capacity or reduce load.
Cause: Short-circuit at drive output. (Check: Check the drive input wiring).

Remedy:
  • Ensure all wiring is correct.
ALE 17
Memory error		 Cause: Data error in Memory read-out / write-in. (Check: Reset parameter or power supply).

Remedy:
  • Please contact your distributor for assistance or contact with Delta.
ALE 18
Serial communication time out		 Cause: Setting value in time out parameter is not correct. (Check: Check communication time out parameter setting).

Remedy:
  • Correctly set P3-07.
Cause: Not receiving communication command for a long time. (Check: Check whether communication cable is loose or broken).

Remedy:
  • Tighten the communication cable.
  • Make sure the communication cable is not damaged.
  • Ensure all wiring is correct.
ALE 19
Motor type error		 Cause: Servo drive and servo motor do not match. (Check: Check the type of servo drive and servo motor and their combination).

Remedy:
  • Replace the servo drive or replace the servo motor.
ALE 20
Input power phase loss		 Cause: Control power supply is in error. (Check: Check the power cable and connections of R, S, T. Check whether the power cable is loose or the possible loss of phase on input power).

Remedy:
  • If the fault does not clear even when the three-phase power is connected correctly, please contact your distributor for assistance or contact with Delta.
ALE 30
LCM hardware error		 Cause: No display. (Check: Check if the 4th Pin of LCM is normal).

Remedy:
  • Please contact your distributor for assistance or contact with Delta.
Cause: Error characters display. (Check: Check if the related Pins are short-circuited and check if IC operation is normal).

Remedy:
  • Please contact your distributor for assistance or contact with Delta.
ALE 31
LED hardware error		 Cause: LED indicator is abnormal. (Check: Check if LED is normal. Check if the transistor is abnormal and check if IC operation is normal by setting P8-09 to 2).

Remedy:
  • Please contact your distributor for assistance or contact with Delta.
ALE 32
KEY hardware error		 Cause: The function key is disabled. (Check: Check if IC operation is normal by setting P8-09 to 1).

Remedy:
  • Activate P8-09 to perform the testing.
  • Please contact your distributor for assistance or contact with Delta.
ALE 33
RAM hardware error		 Cause: LCM display is abnormal (disorganized display). (Check: Please check if the working voltage of RAM is normal).

Remedy:
  • Activate P8-09 to perform the testing.
  • Please contact your distributor for assistance or contact with Delta.
Cause: Function key is abnormal. (Check: Check if the transistor is abnormal and check if IC operation is normal by setting P8-09 to 3).

Remedy:
  • Activate P8-09 to perform the testing.
  • Please contact your distributor for assistance or contact with Delta.
ALE 34
EEPROM hardware error		 Cause: Store data error. (Check: Check if the operation of MCU or EEPROM is normal by setting P8-09 to 4).

Remedy:
  • Activate P8-09 to perform the testing.
  • Please contact your distributor for assistance or contact with Delta.
ALE 35
COMM hardware error		 Cause: Hardware error. (Check: Check if the serial communication signal is normal).

Remedy:
  • Activate P8-09 to perform the testing.
  • Please contact your distributor for assistance or contact with Delta.
Cause: Communication parameter setting is defective. (Check: Check the communication parameter setting).

Remedy:
  • Correctly set parameter setting.
ALE 40
Initial setup error		 Cause: Communication error occurs when initial setup. (Check: Communication initial setup has not completed yet. Please check if the communication serial signal is normal).

Remedy:
  • Correctly set communication parameter setting.
  • Please contact your distributor for assistance or contact with Delta.
Cause: Parameter read error when initial setup. (Check: EEPROM cannot read normally. Set P8-09 to 4 to test EEPROM and check if EEPROM is normal).

Remedy:
  • Activate P8-09 to perform the testing.
  • Please contact your distributor for assistance or contact with Delta.
Cause: Communication mode is error. (Check: Check if using ASDA series servo drive).

Remedy:
  • Please use ASDA series servo drive.
ALE 41
Communication receive time out		 Cause: Not receiving communication data for a long time. (Check: Check if the communication cable is loose or broken).

Remedy:
  • Ensure all wiring is correct.
  • Please contact your distributor for assistance or contact with Delta.
Cause: Data receiving is not completed. (Check: Check if the serial communication signal is normal).

Remedy:
  • Please contact your distributor for assistance or contact with Delta.
ALE 42
Communication receive error		 Cause: Checksum error. (Check: Check if the checksum of the receiving data is correct).

Remedy:
  • Verify the sending and receiving data format.
  • Please contact your distributor for assistance or contact with Delta.
Cause: Checksum error. (Check: Check the communication quality).

Remedy:
  • Please contact your distributor for assistance or contact with Delta.
ALE 43
Error communication response address		 Cause: Receive the error communication response address. (Check: Check if the sending and receiving communication address are the same).

Remedy:
  • Check if the communication setting is correct by using P8-05.
  • Verify the sending and receiving data format.
ALE 44
Error communication response command		 Cause: Respond the error communication command. (Check: Respond the error Modbus command).

Remedy:
  • Verify the sending and receiving data format.
ALE 45
Communication parameter address error		 Cause: Respond the error parameter address. (Check: Check if the sending and receiving communication code are the same).

Remedy:
  • Verify the sending and receiving data format.
ALE 46
Communication parameter content error		 Cause: Respond error parameter content when reading parameter. (Check: The data length of the content is error).

Remedy:
  • Verify the sending and receiving data format.
Cause: Respond error parameter content when writing parameter. (Check: The data content is in error).

Remedy:
  • Verify the sending and receiving data format.
ALE 47
Drive specification error		 Cause: Parameter SAVE operation is in error. (Check: Use P8-13 to check if the specification stored in the memory block match the actual servo drive specification when executing SAVE function).

Remedy:
  • Select the unused memory block to save the parameter.
  • Delete the memory block.
Cause: Parameter WRITE operation is in error. (Check: Use P8-13 to check if the specification stored in the memory block match the actual servo drive specification when executing WRITE function).

Remedy:
  • Select the correct memory block.
ALE 48
Fast editing function error		 Cause: The function of static and auto-tuning is in error. (Check: The setting of P2-32 is incorrect).

Remedy:
  • Set P2-32 to Manual mode.
Cause: The function of dynamic auto-tuning is in error. (Check: Execution time out or the function is not executed completely).

Remedy:
  • Please contact your distributor for assistance or contact with Delta.

How to Read ASDA-B Faults via Keypad & Software

The ASDA-B is a straightforward drive, often controlled by external Pulse/Direction signals from a PLC. Troubleshooting usually involves checking if the drive is receiving those pulses or if the motor is stalling:

  • 5-Button Keypad: The integrated display is your primary tool.
    • Position Error Check: Press the MODE button to switch the display to “User Monitor” mode. Look for “Position Error” (Puls). If this value climbs rapidly until the drive trips on AL009, your mechanical load is likely jammed or the PLC is sending pulses faster than the motor can turn.
  • ASDA-Soft (Legacy): Connection to the ASDA-B requires a specific CN3 cable (RS-232/485).
    • Status Monitor: Use the software to check the “Input Pin Status.” Since the ASDA-B relies on external signals, a loose wire on the SON (Servo On) or CW/CCW Limit pins will prevent operation even if no fault code is displayed.
  • Encoder Cabling: On aging ASDA-B installations, the most common failure point is the CN2 Encoder Cable. If you get intermittent AL011 alarms while the machine is moving, the cable flex-life has likely expired.

Frequently Asked Questions (FAQ)

Q: What does the “AL011” (Encoder Error) code mean?

A: AL011 indicates the drive has lost communication with the motor encoder.

  • Check the CN2 Connector for loose screws or oil contamination.
  • Inspect the cable for internal breaks, especially in cable chains (drag chains).
  • If the cable is good, the optical encoder inside the motor may have failed due to age/vibration.

Q: How do I reset a Delta ASDA-B fault?

A:

  1. Digital Input: Pulse the input configured as ARST (Alarm Reset).
  2. Keypad: Navigate to the alarm screen and press the UP arrow (or hold SET).
  3. Power Cycle: Turn off main power, wait for the display to go dark, and turn it back on.

Q: Can I replace an ASDA-B with an ASDA-B2?

A: Yes, the ASDA-B2 is the direct successor.

  • Migration: The CN1 (I/O) wiring is slightly different, requiring a pinout check.
  • Motor: In many cases, you must replace both the drive and the motor, as encoder protocols have evolved between generations.

 

 

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