Delta ASDA-AB Servo Drive Fault Codes List

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Access the complete reference guide for the legacy Delta ASDA-AB servo drive. Learn to diagnose AL.xx alarms, overload faults, and reset encoder errors via ASDA-Soft.

This guide provides the most updated reference for 2026 to help you troubleshoot these mid-tier legacy drives.

Delta ASDA-AB Fault Codes Reference Table

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

ASDA-AB Series Servo Drive Fault Messages

ASDA-AB Series Servo Drive Fault Messages

Fault Code and Meaning Cause and Remedy
ALE01

Overcurrent		 Cause:
  • Short-circuit at drive output (U, V, W).
  • Motor wiring error.
  • IGBT error (Heat sink overheated).
  • Control parameter setting error.
  • Control command setting error (unstable input).

Remedy:
  • Check wiring connections between drive and motor; repair short-circuits.
  • Avoid exposed metal conductors.
  • Follow user manual wiring steps to reconnect.
  • If IGBT error, contact distributor for assistance.
  • Reset parameters to factory default settings.
  • Ensure input command frequency is stable; activate filter function.
ALE02

Overvoltage		 Cause:
  • Main circuit voltage has exceeded its maximum allowable value.
  • Input power error (Incorrect power input).

Remedy:
  • Use voltmeter to check if input voltage falls within rated specification.
  • Use correct power supply or stabilizing power.
ALE03

Undervoltage		 Cause:
  • Main circuit voltage is below its minimum specified value.
  • No input voltage at main circuit.
  • Input power error.

Remedy:
  • Check whether the wiring of main circuit input voltage is normal.
  • Reconfirm power switch.
  • Use correct power supply or serial stabilizing power.
ALE04

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

Remedy:
  • Check Encoder for damage; repair or replace the motor.
  • Examine the Encoder connector; install the motor again.
ALE05

Regeneration error		 Cause:
  • Regenerative resistor is not connected.
  • Regenerative switch transistor fault.
  • Parameter setting is in error.

Remedy:
  • Check wiring and reconnect regenerative resistor.
  • Check if regenerative switch transistor is short-circuited (Contact distributor).
  • Confirm parameter settings/specs of resistor and reset correctly.
ALE06

Overload		 Cause:
  • Drive exceeded rated load during continuous operation.
  • Control system parameter setting is incorrect.
  • Accel/Decel time setting is too fast.
  • Wiring of drive and encoder is in error.

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.
  • Check wiring of U, V, W and encoder.
ALE07

Overspeed		 Cause:
  • Speed input command is not stable (too much fluctuation).
  • Over-speed parameter setting is defective.

Remedy:
  • Use signal detector to check input; activate filter function (P1-06, P1-07, P1-08).
  • Check if over-speed parameter is too low; correctly set P2-34.
ALE08

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

Remedy:
  • Use pulse frequency detector to measure input.
  • Correctly set the input pulse frequency.
ALE09

Excessive deviation		 Cause:
  • Maximum deviation parameter setting is too small.
  • Gain value is too small.
  • Torque limit is too low.
  • There is an overload.

Remedy:
  • Increase the parameter setting value of P2-35.
  • Correctly adjust gain value.
  • Correctly adjust torque limit value.
  • Reduce external applied load or re-estimate motor capacity.
ALE10

Watch dog execution time out		 Cause:
  • Watch dog execution error.

Remedy:
  • Check and reset the power supply.
  • If abnormal conditions persist, contact distributor/Delta.
ALE11

Encoder error (Position detector fault)		 Cause:
  • The wiring of encoder is in error.
  • Encoder is loose.
  • The wiring of encoder is defective (connections not tight).
  • Encoder is damaged.

Remedy:
  • Check if all wiring is correct per user manual.
  • Examine encoder connector; install motor again.
  • Conduct wiring again.
  • Repair or replace the motor.
ALE12

Adjustment error		 Cause:
  • The setting value of drift adjustment has exceeded its maximum allowable value.

Remedy:
  • Remove CN1 wiring.
  • Execute drift adjustment again (Set P2-08 to 20, then P4-10 to 5).
  • If error does not clear, contact distributor.
ALE13

Emergency stop activated		 Cause:
  • Emergency stop switch is activated.

Remedy:
  • Check switch status; activate/release emergency stop switch.
ALE14

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

Remedy:
  • Check switch status; activate/release reverse limit switch.
  • Check control parameter settings and load inertia.
  • Modify parameter setting and re-estimate motor capacity.
ALE15

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

Remedy:
  • Check switch status; activate/release forward limit switch.
  • Check control parameter settings and load inertia.
  • Modify parameter setting and re-estimate motor capacity.
ALE16

IGBT temperature error		 Cause:
  • The drive has exceeded its rated load (overload or high motor current).
  • Short-circuit at drive output.

Remedy:
  • Increase motor capacity or reduce load.
  • Check the drive input wiring; ensure all wiring is correct.
ALE17

Memory error		 Cause:
  • Data error in Memory read-out / write-in.

Remedy:
  • Reset parameter or power supply.
  • If error persists, contact distributor.
ALE18

DSP communication error		 Cause:
  • Control power is in error.

Remedy:
  • Check and reset control power.
  • If error persists, contact distributor.
ALE19

Serial communication error		 Cause:
  • Communication parameter setting is defective.
  • Communication address is incorrect.
  • Communication value is incorrect.

Remedy:
  • Correctly set parameter settings.
  • Correctly set communication address.
  • Correctly set communication value.
ALE20

Serial communication time out		 Cause:
  • Setting value in time out parameter is not correct.
  • Not receiving communication command for a long time (cable loose/broken).

Remedy:
  • Correctly set P3-07.
  • Tighten communication cable; ensure cable is not damaged.
ALE21

Command write-in error		 Cause:
  • Control power is in error.

Remedy:
  • Check and reset control power.
  • If error persists, contact distributor.
ALE22

Input power phase loss		 Cause:
  • Control power supply is in error (Loose cable or phase loss).

Remedy:
  • Check power cable and connections of R, S, T.
  • If fault persists with correct 3-phase connection, contact distributor.
ALE23

Pre-overload warning		 Cause:
  • The drive is going to overload.

Remedy:
  • Check load condition (refer to ALE06).
  • Check if P1-56 is too small; set P1-56 to 100 and above.
ALE96

The frequency of the entered parameter is abnormal		 Cause:
  • The frequency of the entered parameter is abnormal (over 500 times per hour).

Remedy:
  • Every time power turns on, set P2-30 to 5 first before entering the high-frequency parameter.
ALE97

Internal command execution time out		 Cause:
  • An error occurs when internal command is executing.

Remedy:
  • Check and reset control power.
  • If error persists, contact distributor.
ALE98

DSP communication error		 Cause:
  • Maybe the hardware is damaged.

Remedy:
  • Check and reset control power.
  • If error persists, contact distributor.
ALE99

DSP communication error		 Cause:
  • Maybe the hardware is damaged.

Remedy:
  • Check and reset control power.
  • If error persists, contact distributor.

How to Read ASDA-AB Faults via Keypad & ASDA-Soft

Diagnosing the ASDA-AB involves checking the “Position Error” accumulation and I/O status. Here is how to access critical data using legacy tools:

  • 5-Button Keypad: The integrated display is the fastest way to check status.
    • Load Percentage: Press the MODE button to scroll to the “Load” monitor. If the drive sits at 80-90% load while idle, you likely have mechanical binding or a brake that hasn’t released, which will eventually cause an AL006 trip.
  • ASDA-Soft (Legacy): Connection is made via the CN3 port (RS-232).
    • Digital Scope: The AB series is susceptible to resonance in aging machines. Use the scope to graph “Torque” output. If you see high-frequency oscillation, the mechanical structure may have loosened; use the Auto-Notch Filter (Parameter P2-43 to P2-46) to suppress it.
    • I/O Monitor: Check if the SON (Servo On) or CW/CCW Limit inputs are flickering due to bad wiring.

Frequently Asked Questions (FAQ)

Q: What is the difference between ASDA-B and ASDA-AB?

A: While they look similar, the ASDA-AB is more advanced.

  • Encoder: The AB series typically handles 2500ppr (10,000 resolution) signals with better noise immunity.
  • Communication: The AB has robust Modbus support built-in, whereas the original B-series relied mostly on Pulse/Direction.

Q: How do I fix “AL006” (Overload)?

A: This indicates the average motor load exceeded 100% for too long.

  • Mechanical: Check for a seized bearing, tight belt, or lack of lubrication.
  • Brake: Ensure the 24V brake on the Z-axis is releasing fully.
  • Gain Tuning: If the gains are too “stiff” (high), the motor fights itself, generating heat and artificial load.

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

A:

  1. Digital Input: Toggle the input configured as ARST (Alarm Reset, usually DI.02 or DI.04).
  2. Keypad: Press the UP arrow on the alarm screen.
  3. Power Cycle: Turn the main power off and on (Required for AL001, AL002, AL003).

 

 

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