Parker DC590+ Plus Drive Fault Codes

Troubleshoot your Parker DC590+ Integrator series drive with our updated fault code list. Learn to interpret 6901 keypad messages, use DSE Lite for DC motor diagnostics, and resolve system trips.

Parker DC590+ Fault Codes Reference Table

Below is the complete list of trips and diagnostic alarms. Most DC590+ units utilize the 6901 keypad, which provides descriptive text (e.g., “FIELD FAIL”) rather than ambiguous numeric codes.

DC590+ Series DC Digital Drive Faults and Alarms

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 (alarm only operates with encoder or armature volts feedback selected). Remedy: Check speed loop tuning. Note: Alarm time delay is 50 milliseconds.
MISSING PULSE A missing pulse from the 6-pulse armature current waveform.	Cause: Firing plug failure or Connection failure. Note: This trip is only enabled when motor loading exceeds 1.5 times the DISCONTINUOUS parameter value. Remedy: Check firing circuit connector problems. We recommend fusing the armature circuit if regenerative operation is intended. Note: Alarm time delay is 60 seconds.
FIELD OVER I The motor field current has exceeded 120% of the calibrated value.	Cause: External field has incorrect supply phases applied. Remedy: Check external field supply phases. Note: Alarm only operates with field current control mode selected.
HEATSINK TRIP The Drive heatsink temperature is too high.	Cause: The ambient air temperature is too high; Poor ventilation or spacing between Drives; Blocked ventilation slots; Clogged air filters; Excessive armature current. Remedy: Check for fan failure or wrong rotation. Check fuse on power board. Clean air filters and ventilation slots. Check nominal armature current against calibration. Allow the stack 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. Check nominal armature current on nameplate against current calibration. Allow the motor to cool in order to re-start the Drive.
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; Badly adjusted field-weakening bemf loop; Badly adjusted speed loop. Remedy: Check armature connections. Adjust relevant loops (field voltage, field current, bemf, speed).
SPEED FEEDBACK Difference between speed feedback and armature voltage feedback is greater than SPDFBK ALM LEVEL.	Cause: Analog tacho feedback polarity incorrect; ENCODER SIGN parameter polarity incorrect; Disconnection of wiring (including fibre optics); Tachogenerator failure/coupling failure. Remedy: Check wiring and polarity (terminals G3 and G4). Check fibre optic cables. Check tachogenerator and coupling. Ensure armature voltage calibration is reduced when running at reduced field currents.
ENCODER FAILED No speed feedback signal.	Cause: SPEED FBK SELECT parameter is set to ENCODER but an optional Encoder board is not fitted; Damaged fibre optic cable. Remedy: Check fibre optic cable for damage, bend radius, operating length. Check cable and connections on wire-ended encoder.
FIELD FAIL Field current is less than 6% (Current Control) or 50mA (Voltage Control).	Cause: Open circuit motor field; Faulty operation of field controller; Missing 3-phase supply for synchronization. Remedy: Check connection and measure field resistance. Check connections FL1 & FL2 for line-to-line voltage. For permanent magnet motors, set FIELD ENABLE parameter to DISABLED.
3-PHASE FAILED 3-phase supply failure.	Cause: Total failure of supply or missing phase; Blown fuses (thyristor stack or power chassis). Remedy: Check supply to the controller. Check high-speed thyristor stack protection fuses. Check mains voltage of the Drive (wrong unit/controller voltage).
PHASE LOCK Supply frequency is outside limits 45 - 65Hz.	Cause: Supply frequency fault; Synchronization errors caused by distorted supply. Remedy: Check supply frequency.
5703 RCV ERROR Invalid data received via P3 port from another Drive.	Cause: Communication error. Remedy: Note: Alarm only operates when MODE parameter is set to 5703 SLAVE.
STALL TRIP Motor stationary, current exceeded STALL THRESHOLD for longer than STALL TRIP DELAY.	Cause: Mechanical stall or load issue. Remedy: Check motor load. Note: Alarm only operates when the STALL TRIP parameter is enabled.
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. Check current loop tuning. Refer to Parker SSD Drives for faulty drive.
ACCTS FAILED AC current transformer plug connection to Drive power board missing.	Cause: Plug disconnected; Load imbalance (Frame 5). Remedy: Check armature current transformer plug for correct installation.
AUTOTUNE ERROR Error encountered during Autotune process.	Cause: Motor shaft rotating; Open-circuit wiring; Discontinuous current boundary too high; Large supply imbalance; Hardware fault. Remedy: Ensure motor shaft is stationary. Check drive to armature wiring. Check supply voltage balance.
AUTOTUNE ABORT The Autotune sequence has been aborted.	Cause: Coast Stop/Program Stop/Enable disabled; AUTOTUNE parameter reset; Timeout (2 mins). Remedy: Check terminal inputs during Autotune. Restart Autotune sequence.
SEQ PRE READY Coding not present.	Cause: Hardware configuration issue. Remedy: Replace power board or chassis.
CONTACTOR DELAY The internal auxiliary 3-phase contactor failed to close.	Cause: Calibration issue. 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 flag set.	Cause: REM. SEQUENCE parameter Remote Trip flag set to zero. Remedy: Check Remote Sequence parameters.
ENABLE LOW Local Mode run with Enable input low.	Cause: Enable input is low while trying to run in Local Mode. Remedy: Check Enable input signal.
SEQUENCING Internal sequencing error.	Cause: Internal software/hardware error. Remedy: Contact Parker SSD Drives.
COMMS TIMEOUT Remote comms timeout.	Cause: Communication interruption. Remedy: See COMMS TIMEOUT parameter in the SEQUENCING function block.
CONFIG ENABLED The drive was 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 unit off and on. If problem persists, contact Parker SSD Drives.
NO OP STATION Keypad has been disconnected from Drive whilst Drive is running in local control.	Cause: Keypad disconnection. Remedy: Reconnect Keypad.
AUX SUPPLY Auxiliary supply failure.	Cause: Missing or unstable supply. Remedy: Check auxiliary supply and/or mains input.
COMMS FAULT CODE x Keypad or remote cable fault.	Cause: Keypad faulty; Remote cable to keypad faulty; Drive firmware not running. Remedy: Check keypad and cables.
CRITICAL ERROR System Critical Error.	Cause: Internal failure. Remedy: Contact Parker SSD Drives.
(EEPROM) CHECKSUM FAIL Parameters not saved, or are corrupted.	Cause: Corrupted UDP file loaded. Remedy: Press the E key and perform a PARAMETER SAVE. The Drive will be returned to its factory default values.
LANGUAGE CHECKSUM FAIL Incorrect language selected, or corrupted.	Cause: Corrupted UDP file loaded. Remedy: Press the E key and reload the correct language or de-select the second language.

 

How to Read Parker DC590+ Faults via DSE Lite

While the 6901 keypad is excellent for local diagnostics, the Parker Drive System Explorer (DSE Lite) software is the essential tool for deep-level troubleshooting in 2026. Because DC systems often involve external feedback (Tachogenerators or Encoders), DSE Lite allows you to visualize signal stability.

Key Diagnostic Features:

• First Trip Parameter: In multi-fault scenarios, navigate to the “Trips Status” function block in DSE Lite to identify the First Trip. This allows you to ignore consequential trips (like “Coast Stop”) and find the original root cause.
• Chart Recorder & Oscilloscope: Use DSE Lite to monitor armature current and speed feedback in real-time. This is particularly helpful for diagnosing “Stall” or “Speed Feedback” trips caused by mechanical wear in the DC motor brushes or coupling.
• P3 Serial Port: The diagnostics port (P3) is located behind the keypad. Using a serial-to-USB adapter, you can extract the full configuration and trip log even if the drive’s main display is non-functional.

Frequently Asked Questions (FAQ)

Q: What is the difference between a Self-Test Alarm and a Trip?

A:

• Self-Test Alarms (e.g., Checksum Fail): These usually occur at power-up and indicate an issue with the drive’s internal memory or configuration file.
• Trips (e.g., OVER I TRIP): These occur during operation and indicate a live fault that has stopped the motor for safety.

Q: How do I reset a Parker DC590+ fault?

A: After the fault condition is resolved, you can reset the drive by:

1. Pressing the red STOP/RESET button on the 6901 keypad.
2. Toggling a Digital Input configured for “Reset” (commonly terminal C4).
3. Issuing a reset via the Fieldbus TechBox (Profinet, Ethernet/IP, etc.).

Q: Why is my drive showing “3-PHASE FAILED”?

A: This is the most common trip on DC590+ drives. It indicates a loss of one or more phases on the high-power AC input. Check your main supply fuses, the AC contactor, and the incoming line voltage balance.

Q: Where is the fault history stored?

A: The drive stores the last 10 trips. These can be viewed directly on the 6901 keypad under the DIAGNOSTICS menu or extracted as a report using DSE Lite.