Parker DC590PR Drive Fault Codes

Troubleshoot your Parker DC590PR Power Rack DC drive with our updated fault code list. Learn to interpret 6901 keypad trips, check field failures, and use DSE Lite.

Parker DC590PR Fault Codes Reference Table

Below is the complete list of trips and diagnostic messages for the DC590PR. Refer to the specific text displayed on your 6901 keypad for the primary diagnostic lead.

DC590PR Series Trips and Fault Finding

DC590PR Series DC Digital Drive - Trips and Fault Finding

Fault Code and Meaning Cause and Remedy
OVERSPEED

Motor overspeed - the speed feedback signal has exceeded 125% of rated speed.		 Cause:
  • Badly adjusted speed loop.
  • Note: Alarm only operates with encoder or armature volts feedback selected.

Remedy:
  • Adjust speed loop settings.
  • Note: Alarm time delay is 50 milliseconds.
MISSING PULSE

A missing pulse from the 6-pulse armature current waveform.
(Only enabled when motor loading exceeds 1.5 times the DISCONTINUOUS parameter).		 Cause:
  • Firing plug failure.
  • Connection failure.
  • Firing circuit connector problems during motoring operation.

Remedy:
  • Check firing plug and connections.
  • Note: We recommend fusing the armature circuit if regenerative operation is intended.
  • Alarm time delay: 60 seconds.
FIELD OVER I

The motor field current has exceeded 120% of the calibrated value.		 Cause:
  • External field has incorrect supply phases applied.
  • (Alarm only operates with field current control mode selected).

Remedy:
  • Check external field supply phases.
  • Alarm time delay: 10 seconds.
HEATSINK TRIP

The Drive heatsink temperature is too high.		 Cause:
  • Ambient air temperature is too high.
  • Poor ventilation or spacing between Drives.
  • Fan failure.
  • Blocked ventilation slots or clogged air filters.
  • Excessive armature current.

Remedy:
  • Check fuse on power board.
  • Check for wrong fan rotation (models above 70A bridge rating).
  • Clean ventilation slots and filters.
  • Check nominal armature current on nameplate against current calibration.
  • Note: The stack must be allowed to cool in order to re-start the Drive.
THERMISTOR

The motor temperature is too high.		 Cause:
  • Inadequate ventilation.
  • Blower failure.
  • Excessive armature current.

Remedy:
  • Check blower direction and air filters (clogged).
  • Check nominal armature current on nameplate against current calibration.
  • Allow motor to cool to re-start.
OVER VOLTS (VA)

Motor armature voltage has exceeded 120% of rated volts.		 Cause:
  • Loose armature connection.
  • Badly adjusted field voltage setting.
  • Badly adjusted field current loop, field-weakening bemf loop, or speed loop.

Remedy:
  • Secure armature connections.
  • Adjust field and speed loop settings.
SPEED FEEDBACK

Difference between speed feedback and armature voltage feedback is greater than SPDFBK ALM LEVEL.		 Cause:
  • Analog tacho feedback polarity incorrect (terminals G3 and G4).
  • The ENCODER SIGN parameter’s polarity is incorrect.
  • Disconnection of wiring, including fibre optics.
  • Armature voltage calibration not suitably reduced when running at reduced field currents.
  • Tachogenerator failure or coupling failure.

Remedy:
  • Check tacho polarity and wiring.
  • Check Encoder Sign parameter.
  • Inspect fibre optics.
ENCODER FAILED

No speed feedback signal.		 Cause:
  • SPEED FBK SELECT parameter is set to ENCODER but optional Encoder board is not fitted.
  • Fibre optic cable damage or incorrect bend radius.

Remedy:
  • Check fibre optic cable for damage.
  • Refer to Microtach handbook for operating length.
  • Check cable and connections on wire-ended encoder.
FIELD FAIL

Field current is less than 6% (Current Control mode) or 50mA (Voltage Control mode).		 Cause:
  • Open circuit motor field.
  • Faulty operation of field controller.
  • Missing AC supply to onboard field regulator.

Remedy:
  • Check connection and measure field resistance.
  • Check connections FL1 & FL2 for line-to-line voltage.
  • If no field supply required (e.g. permanent magnet motor), set FIELD ENABLE parameter to DISABLED.
3-PHASE FAILED

3-phase supply failure.		 Cause:
  • Total failure of supply or missing phase.
  • Blown fuses (high-speed thyristor stack or power chassis coding).
  • Incorrect mains voltage for the controller.

Remedy:
  • Check supply to the controller.
  • Check protection fuses.
  • Verify mains voltage against Product Code.
PHASE LOCK

Supply frequency is outside the frequency band limits 45 - 65Hz.		 Cause:
  • Supply frequency issue.
  • Synchronisation errors caused by distorted supply.

Remedy:
  • Check supply frequency.
5703 RCV ERROR

Invalid data received via P3 port from another Drive.		 Cause:
  • Communication error on P3 port.
  • (Alarm only operates when MODE parameter is set to 5703 SLAVE).

Remedy:
  • Check connections on P3 port.
STALL TRIP

Motor stationary with current exceeding STALL THRESHOLD for longer than delay.		 Cause:
  • Motor is stalled while current is high.
  • (Alarm only operates when STALL TRIP parameter is enabled).

Remedy:
  • Remove mechanical blockage or adjust stall parameters.
OVER I TRIP

Current feedback value has exceeded 280% of rated current.		 Cause:
  • Motor armature windings failure.
  • Badly tuned current loop.
  • Faulty Drive.

Remedy:
  • Check insulation resistance of armature windings.
  • Tune current loop.
  • Contact Parker if Drive is faulty.
ACCTS FAILED

AC current transformer plug connection to Drive power board missing.		 Cause:
  • Plug missing or loose.
  • Frame 5 only: Load imbalance between parallel power stacks.

Remedy:
  • Check armature current transformer plug for correct installation.
AUTOTUNE ERROR

Error encountered during Autotune process (Speed > 20% or Field > 6%).		 Cause:
  • Motor shaft was rotating or caused to rotate.
  • Field current exceeded 6% during field-off Autotune.
  • Drive to armature wiring open-circuit.
  • Discontinuous current boundary > 200%.
  • Large imbalance in three-phase supply voltages.
  • Hardware fault on control board.

Remedy:
  • Ensure motor shaft is stationary.
  • Check wiring and supply voltages.
  • Refer to "Control Loops - Manual Tuning" in manual.
AUTOTUNE ABORT

The Autotune sequence has been aborted.		 Cause:
  • Coast Stop, Program Stop, Enable or Start Run terminal(s) disabled during sequence.
  • AUTOTUNE parameter reset during sequence.
  • Autotune sequence timed-out (approx 2 mins).

Remedy:
  • Check enable/start signals and retry.
SEQ PRE READY

Coding not present.		 Cause:
  • Power board or chassis issue.

Remedy:
  • Replace power board or chassis.
CONTACTOR DELAY

The internal auxiliary 3-phase contactor failed to close.		 Cause:
  • Internal contactor failure.

Remedy:
  • Check the position of the Calibration Scaling Switch.
EXTERNAL TRIP

Customer alarm! (Trip operates if input open or high impedance).		 Cause:
  • Device not wired to drive or device open circuited.

Remedy:
  • Check C1 to C2 connections to drive.
  • Connect C1 to C2 if customer device not fitted.
REMOTE TRIP

Remote trip activated.		 Cause:
  • REM. SEQUENCE parameter Remote Trip flag set to zero.

Remedy:
  • Check remote sequence parameters.
ENABLE LOW

Enable input is low.		 Cause:
  • Local Mode run attempted with Enable input low.

Remedy:
  • Check Enable input signal.
SEQUENCING

Internal sequencing error.		 Cause:
  • Internal error.

Remedy:
  • Contact Parker.
COMMS TIMEOUT

Remote comms timeout.		 Cause:
  • Communication interruption.

Remedy:
  • See COMMS TIMEOUT parameter in the SEQUENCING function block.
CONFIG ENABLED

Drive requested to start whilst in Configuration mode.		 Cause:
  • Drive is in Configuration mode.

Remedy:
  • Exit Configuration mode before starting.
CALIBRATION FAIL

Signal calibration fault.		 Cause:
  • Hardware failure suspected.

Remedy:
  • Power the unit off and on.
  • If problem persists, contact Parker.
NO OP STATION

Keypad disconnected during local control.		 Cause:
  • Keypad has been disconnected from Drive whilst Drive is running in local control.

Remedy:
  • Reconnect keypad or switch control modes.
AUX SUPPLY

Auxiliary supply failure.		 Cause:
  • Issue with aux supply or mains input.

Remedy:
  • Check auxiliary supply and/or mains input.
COMMS FAULT CODE x

Communication hardware fault.		 Cause:
  • Keypad faulty.
  • Remote cable to keypad faulty.
  • Drive firmware not running.

Remedy:
  • Check keypad and cable.
  • Check firmware status.
CRITICAL ERROR

xxxx::xxxxxxxx		 Cause:
  • Critical system error.

Remedy:
  • Contact Parker.
(EEPROM) CHECKSUM FAIL

Parameters not saved, or are corrupted.		 Cause:
  • Corrupted UDP file loaded.
  • (Appears at power-up or end of "Upload" UDP Transfer).

Remedy:
  • Press the E key.
  • Perform a PARAMETER SAVE.
  • Note: Drive will return to factory default values.
LANGUAGE CHECKSUM FAIL

Incorrect language selected, or corrupted.		 Cause:
  • Corrupted UDP file loaded.
  • (Appears at power-up or end of "Upload" UDP Transfer).

Remedy:
  • Press the E key.
  • Reload the correct language or de-select the second language.
 

How to Read Parker DC590PR Faults via DSE Lite

Because the DC590PR is often used in large-scale system integration, the Parker Drive System Explorer (DSE Lite) software is the best tool for professional diagnostics in 2026. This is particularly useful for diagnosing speed feedback loops or field current stability.

Key Diagnostic Features:

  • First Trip Capture: Use the “Trips Status” function block in DSE Lite to identify the “First Trip.” In high-power DC systems, a minor fault often causes a cascade of secondary trips; the First Trip parameter shows the true root cause.
  • Armature & Field Monitoring: Unlike AC drives, DC drives must manage both armature and field current. DSE Lite allows you to graph these simultaneously to see if a trip like “FIELD FAIL” is due to a hardware failure or a calibration error in the field controller.
  • Oscilloscope Triggering: You can set the DSE Lite oscilloscope to trigger automatically on a “Fault” bit. This captures the exact state of the armature voltage and current spikes at the millisecond the trip occurred.

Frequently Asked Questions (FAQ)

Q: What is the difference between an Alarm and a Trip on the 590PR?

A:

  • Alarms: These appear on the keypad (e.g., “STALL”) to warn that the drive is reaching its current limit. The motor continues to run, but intervention is needed.
  • Trips: These are critical failures (e.g., “OVER I”) that immediately shut down the thyristor firing pulses and stop the motor.

Q: How do I reset a Parker DC590PR fault?

A: Once the fault is cleared, you can reset the drive by:

  1. Pressing the red STOP/RESET button on the keypad.
  2. Toggling a Digital Input (typically C4) configured for “Reset.”
  3. Cycling the 24V DC control power (not recommended as it clears the “First Trip” volatile memory).

Q: Why is my drive showing “FIELD FAIL”?

A: This is a common DC590PR trip. It means the drive has detected that the field current is below the “Field Failed” threshold. Check for open-circuit field windings in the motor, loose connections at the terminal block, or a blown field fuse inside the Power Rack.

Q: Where is the trip history stored?

A: The drive stores the last 10 trips in non-volatile memory. You can view these by navigating to DIAGNOSTICS > TRIP HISTORY on the 6901 keypad or by downloading the log through the P3 port using DSE Lite.

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