Parker P Series Servo Drive Fault Codes

Troubleshoot your Parker P Series servo drive with our updated fault code list. Learn to interpret AL-series alarm codes, use the P-Series Support Tool, and fix motion errors.

Parker P Series Alarm Codes Reference Table

Below is the complete list of alarm codes and diagnostic messages. Please identify the specific code (e.g., AL-10) flashing on your drive’s front display.

Parker Hannifin P Series - Alarm Codes

Parker Hannifin P Series Alarm Codes

Fault Code and Meaning Cause and Remedy
AL-10

IPM fault
Over current
Current limit exceeded		 Cause:
  • Motor/Encoder cable error: Wiring is incorrect or has shorts.
  • Parameter error: Motor ID [0x2000], encoder type [0x2001], or encoder form [0x2002] settings do not match motor label.
  • Motor phase resistance: Short between phases or ground.
  • Machine part problem: Conflict/binding in equipment or motor undersized.
  • Drive error: U/V/W phase current Offset is 5% or above rated current.
  • Error by noise: Noise interference in wiring.

Remedy:
  • Replace motor or encoder cables.
  • Modify motor label and parameters to match.
  • Check/Replace motor.
  • Check machine parts for binding.
  • If alarm continues after servo on, replace drive.
  • Check FG wiring and match wire sizes.
AL-11

IPM temperature		 Cause:
  • Surrounding temperature: Temperature is over 50 [°C].
  • Continuous Overload: Accumulated operate overload percentage [0x2603] is high.
  • Motor cable open: Check accumulated regenerative overload [0x2606].
  • Drive setting direction: Drive setting status issue.

Remedy:
  • Lower surrounding temperature.
  • Change drive/motor capacity or tune gain.
  • Adjust regeneration resistor setting [0x2009] or use external resistor.
  • Refer to "2. Wiring and Joint".
  • If alarm continues after servo on, replace drive.
AL-15

Current offset		 Cause:
  • Motor U/V/W phase current offset too high: The offset [0x2015~0x2017] is 5% of the rated current or higher.

Remedy:
  • Rerun adjusting phase current offset.
AL-21

Continuous overload		 Cause:
  • Continuous operation exceeding ratings: Load accumulating driving load rate [0x2603] is high (motor undersized).
  • Motor brake error: Motor brake is not holding.
  • Parameter setting error: Motor ID, Encoder type/form mismatch or Standard load rate setting [0x200F] issue.
  • Hardware/Wiring: Machine binding, Motor cable short, or Encoder cable short.

Remedy:
  • Change drive and motor capacity; Please tune gain.
  • Provide power to motor brake.
  • Modify parameters to match motor label info.
  • Set standard load rate to proper value.
  • Check machine part.
  • Replace motor or encoder cables.
AL-22

Drive temperature 1		 Cause:
  • Surrounding temperature: Temperature is over 50 [°C].
  • Drive error: Displayed value [0x260B] differs significantly from actual surrounding temperature.

Remedy:
  • Lower surrounding temperature of drive.
  • Replace the drive.
AL-23

Regeneration overload		 Cause:
  • Capacity excess: High frequency operating or continuous regenerative operating.
  • Parameter setting error: Invalid settings in [0x2009] ~ [0x200E].
  • Main power input voltage error: Main power supply issue.
  • Drive error: Regenerative resistance temperature issue in Servo-off status.

Remedy:
  • Adjust value for 0x2009. Use braking resistor.
  • Set parameters as correct values.
  • Recheck the power supply.
  • Replace the drive.
AL-24

Motor cable open		 Cause:
  • Parameter setting error: Check [0x2015] value offset current.
  • Motor cable error: Cable is disconnected.
  • Motor error: Open circuit of U, V, W in motor or cable.
  • Drive error: Specific alarm signal occurs persistently.

Remedy:
  • Process the Phase Current Offset Control procedure command.
  • Replace the motor cable.
  • Replace the motor.
  • Replace drive if alarm persists after eliminating other causes.
AL-25

Drive temperature 2		 Cause:
  • Surrounding temperature: Temperature is over 50 [°C].
  • Drive error: Comparing displayed drive temperature 2 [0x260C] shows discrepancy with normal status.

Remedy:
  • Lower the surrounding temperature of drive.
  • Replace the drive.
AL-26

Encoder temperature		 Cause:
  • Reserved.

Remedy:
  • (No specific remedy listed).
AL-30
AL-31
AL-32

Encoder communication
Encoder cable open
Encoder data		 Cause:
  • Encoder cable error: Wiring is incorrect or shorted.
  • Parameter setting error: Value of [0x2001], [0x2002] does not match application motor label.
  • Encoder error: Internal encoder fault.
  • Drive error: Internal drive fault.

Remedy:
  • Disconnect, check wiring for shorts, and replace encoder cable.
  • Modify parameters to match motor label information.
  • If alarm continues after servo on, replace drive (drive or motor may have problem).
AL-33

Motor setting		 Cause:
  • Setting Motor ID: Value of [0x2000] is not same with application motor label.
  • Drive error: Internal failure.

Remedy:
  • Revise ID with motor label information. (Alarm may release after power off/on).
  • If alarm continues after servo on again, replace drive.
AL-34

Z Phase open		 Cause:
  • Encoder cable error: Wiring is incorrect, shorts or opens.
  • Encoder error: Internal fault.
  • Drive error: Internal fault.

Remedy:
  • Replace encoder cable.
  • If alarm continues after servo on again, replace drive (or motor).
AL-35

Low battery		 Cause:
  • Parameter setting error: Check setting value [0x2005].
  • Bad connection: Battery No connected or check status of battery access.
  • Battery voltage low: Voltage is under 3.3v.

Remedy:
  • Set as 1 when using absolute encoder as incremental encoder to suppress alarm.
  • Connect battery correctly.
  • Replace battery.
AL-36

Sinusoidal ENC amplitude		 Cause:
  • Encoder cable error: Wiring is incorrect, check shield and FG disconnect.
  • Parameter setting error: Check setting value of encoder type [0x2001].

Remedy:
  • Replace encoder cable.
  • Check setting encoder type. Check speed command (Max: 250kHz).
AL-37

Sinusoidal ENC frequency		 Cause:
Drive error, Resolver error, or Encoder error.

Remedy:
  • If alarm continues after servo on again, Replace drive (drive may have a problem).
AL-38

Encoder setting error		 Cause:
  • Drive / Motor combination error (Brand label mismatch).
  • Encoder cable error (Wiring incorrect or Short).
  • Encoder or Drive internal error.

Remedy:
  • Check brand label code of motor and drive; Use motor and drive of same brand label.
  • Replace encoder cable.
  • If alarm continues after servo on again, Replace drive.
AL-40

Under voltage		 Cause:
  • Main power input voltage is over 3phase 134[Vac].
  • DC link value [0x2605] is over 190[Vdc].
  • Running when power voltage is low (wiring issue).

Remedy:
  • Recheck the power supply.
  • Use 3 phase as supply voltage.
  • Check wiring of main power supply.
  • If power input is correct but DC link error persists, Replace the drive.
AL-41

Over voltage		 Cause:
  • Main power input voltage is below 253[Vac].
  • DC link value [0x2605] is below 405[V].
  • Regenerative resistance issue (Braking resistor high).
  • Acceleration/deceleration time too short.
  • Drive error.

Remedy:
  • Recheck the power supply.
  • Review the regenerative resistance considering operating condition and load.
  • Set longer acceleration/deceleration time.
  • If alarm continues after servo on again, Replace drive.
AL-42

Main power fail		 Cause:
  • Main power input voltage error (Phase 200-230Vac of L1, L2, L3).
  • Parameter setting error [0x2006].
  • Momentary power failure [0x2007].
  • Drive error.

Remedy:
  • Recheck power supply.
  • Wire or set parameter as input power on (possible 3 phase).
  • Check main power source or reduce value of [0x2007].
  • If alarm continues after servo on again, Replace drive.
AL-43

Control power fail		 Cause:
  • Voltage between phase of C1, C2 error (Should be within 200-230Vac).
  • Drive error.

Remedy:
  • Recheck power supply of drive.
  • If alarm continues after servo on again, Replace drive.
AL-50

Over speed limit		 Cause:
  • Motor Encoder error or Encoder cable error (Wiring/Short).
  • Parameter setting error ([0x2000]-[0x2002] mismatch with label).
  • Gain adjustment required.

Remedy:
  • Replace motor cable or encoder cable.
  • Modify parameter to match motor label information.
  • Set Electronic gear ratio low (Check [0x6091]).
  • Readjust gain according to operating condition.
  • If alarm continues after servo on again, Replace drive.
AL-51

POS following		 Cause:
  • Parameter setting error ([0x3000], [0x3003], [0x3004]).
  • Position error excess time or range ([0x6066], [0x6065]).
  • Machine part has problem (forced by drive part).

Remedy:
  • Set up correct parameter according to operating method.
  • Set Electronic gear ratio low.
  • Check Machine part has problem.
  • If alarm continues after servo on again, Replace drive.
AL-53

Excessive SPD deviation		 Cause:
  • Motor/Encoder cable error (Disconnect, wiring incorrect, short).
  • Parameter setting mismatch ([0x2000] series).
  • Machine part has problem (forced by drive part).

Remedy:
  • Replace motor/encoder cable.
  • Modify parameter to match motor label information.
  • Set Electronic gear ratio low.
  • Check Machine part/limit contact point sensor.
  • If alarm continues after servo on again, Replace drive.
AL-63

Parameter checksum		 Cause:
  • When O/S is changed, parameter setting value was set as maximum value of variable form.
  • Drive error.

Remedy:
  • Restore initial parameter (0x1011). Note: Settings will change to initial values; set up parameter before operating.
  • If alarm continues after servo on again, Replace drive.
AL-71

Factory setting		 Cause:
Parameter setting error. Contact service center.

Remedy:
  • Check [0x1008] Device Name.
  • Please download OS or set capacity of drive again.
  • If alarm continues after servo on again, Replace drive.
W01

Main power fail (PWR_FAIL)		 Cause:
The main power failed when the action in case of main power fail is set to warning in the main power input mode setting (0x2006).

Remedy:
  • Check main power supply.
  • Check parameter [0x2006] setting.
W02

Low encoder battery (LOW_BATT)		 Cause:
Encoder battery is low, when applying absolute encoder.

Remedy:
  • Check and replace encoder battery.
W04

Software position limit (SW_POS_LMT)		 Cause:
When using software position limit function, position command larger than the software position value was input.

Remedy:
  • Check position command input.
W08

Excessive DB current (OV_DB_CUR)		 Cause:
DB current exceeding the fault level was output.

Remedy:
  • Check operating conditions causing excessive dynamic braking current.
W10

Operation overload (OV_LOAD)		 Cause:
Accumulated operation overload ratio reached the warning level (0x2010).

Remedy:
  • Check for equipment clash or arrest.
  • Check load status, brake action.
  • Check for drive output miss wiring or encoder miss wiring.
  • Check motor ID, drive ID, encoder setting.
W20

Drive/motor combination fail (SETUP)		 Cause:
Motor’s current capacity is bigger than the drive’s current capacity.

Remedy:
  • Verify motor and drive compatibility.
W40

Low voltage (UD_VTG)		 Cause:
The main power input voltage is under 190V when the action in case of main power fail is set to warning in the main power input mode setting (0x2006).

Remedy:
  • Check input voltage.
  • Check setting [0x2006].
W80

Emergency signal input (EMG)		 Cause:
Emergency stop contact signal detected.

Remedy:
  • Check emergency stop contact signal.
  • Check external 24V power.
 

How to Read Parker P Series Faults via P-Series Support Tool

For complex troubleshooting in 2026, the P-Series Support Tool is the most effective way to analyze drive behavior. Connecting your PC via the mini-USB port allows you to see the drive’s internal status at the microsecond the trip occurred.

Key Diagnostic Features:

  • Alarm History: The P Series drive maintains a non-volatile log of the last 10 alarms. The support tool displays these with a sub-code that provides much deeper detail than the 2-digit display on the drive.
  • Real-Time Monitor: You can monitor variables such as “Regeneration Load Ratio,” “Peak Torque,” and “Encoder Position.” This is vital for diagnosing AL-30 (Regeneration) or AL-21 (Overload) faults caused by excessive mechanical friction.
  • Status Word Analysis: For EtherCAT (PD-xxE) models, the software allows you to view the drive’s Status Word, helping you determine if a “fault” is actually a lack of “Enable” signal from the PLC.
  • Oscilloscope: The built-in scope can be set to trigger on an alarm bit, capturing speed and current waveforms leading up to the trip.

Frequently Asked Questions (FAQ)

Q: What is the difference between a Warning and an Alarm?

A:

  • Warnings (W): These indicate a non-critical issue (e.g., “Main Power Phase Loss”) where the drive may continue to operate but with limited performance.
  • Alarms (AL): These are hard faults that immediately stop motor motion and disable the drive’s output stage for safety.

Q: How do I reset a Parker P Series alarm?

A: Once the root cause is fixed, you can reset the drive by:

  1. Toggling the ALMRST (Alarm Reset) digital input.
  2. Clicking the “Alarm Reset” button in the P-Series Support Tool software.
  3. Cycling the 24V DC control power (L1C/L2C).

Q: Why does my drive display AL-10 (Overcurrent)?

A: AL-10 is a hardware protection trip. It is usually caused by a short circuit in the motor power cable, a failure in the motor windings, or an extremely aggressive acceleration setting. Always check cable continuity before resetting this specific alarm.

Q: Where is the fault history stored on the keypad?

A: You can view the history without a PC by navigating the keypad to the [St-00] through [St-09] display parameters. [St-00] displays the most recent alarm code.

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