Parker AC650V Drive Fault Codes

Troubleshoot your Parker SSD 650V high-performance vector drive with our updated fault code list. Learn to interpret MMI mnemonics and use DSE Lite via the P3 port.

Parker AC650V Fault Codes Reference Table

Below is the complete list of fault and warning messages. Note that the 650V displays these as 4-character mnemonics (on the 6511 keypad) or full text (on the optional 6901 keypad).

650V AC Drive - Trips and Faults

Fault Code and Meaning	Cause and Remedy
1 OVERVOLTAGE	Cause: The drive internal dc link voltage is too high. Remedy: Check if the supply voltage is too high. Trying to decelerate a large inertia load too quickly; DECEL TIME too short. The brake resistor is open circuit.
2 UNDERVOLTAGE	Cause: DC link low trip. Remedy: Supply is too low or power down occurred.
3 OVERCURRENT	Cause: The motor current being drawn from the drive is too high. Remedy: Trying to accelerate a large inertia load too quickly; Check ACCEL TIME. Trying to decelerate a large inertia load too quickly; Check DECEL TIME. Application of shock load to motor. Check for short circuit between motor phases. Check for short circuit between motor phase and earth. Motor output cables too long or too many parallel motors connected to the drive. FIXED BOOST level set too high.
4 HEATSINK	Cause: Drive heatsink temperature > 100ºC. Remedy: The ambient air temperature is too high. Poor ventilation or spacing between drives.
5 EXTERNAL TRIP	Cause: The external trip input is high. Remedy: Check configuration to identify the source of the signal (non-standard configuration).
6 INVERSE TIME	Cause: A prolonged overload condition, exceeding the Inverse Time allowance, has caused the trip. Remedy: Remove the overload condition.
7 CURRENT LOOP	Cause: A current of less than 1mA is present when 4-20mA setpoint is selected. Remedy: Look for a wire break.
8 MOTOR STALLED	Cause: The motor has stalled (not rotating). Drive in current limit > 200 seconds. Remedy: Motor loading too great. FIXED BOOST level set too high.
9 ANIN FAULT	Cause: AIN2 overload on terminal 3. Remedy: Overcurrent applied in Current mode to terminal 3.
10 BRAKE RESISTOR	Cause: External dynamic brake resistor has been overloaded. Remedy: Trying to decelerate a large inertia too quickly or too often.
11 BRAKE SWITCH	Cause: Internal dynamic braking switch has been overloaded. Remedy: Trying to decelerate a large inertia too quickly or too often.
12 DISPLAY/KEYPAD	Cause: Keypad has been disconnected from drive whilst drive is running in Local Control. Remedy: Keypad accidentally disconnected from drive (indicated over Comms, or by second keypad).
13 LOST COMMS	Cause: Lost communications. Remedy: COMMS TIMEOUT parameter set too short. Master device failed. Wiring broken. Incorrect Comms setup.
14 CONTACTOR FBK	Cause: Contactor feedback signal lost. Remedy: Check connection to the terminal wired to "contactor closed" parameter in Sequencing Logic.
15 SPEED FEEDBACK	Cause: Speed feedback error. Remedy: SPEED ERROR > 50.00% for 10 seconds.
16 AMBIENT TEMP	Cause: Ambient temperature issue. Remedy: The ambient temperature in the drive is too high.
17 MOTOR OVERTEMP	Cause: The motor temperature is too high. Remedy: Excessive load. Motor voltage rating incorrect. FIXED BOOST level set too high. Prolonged operation of the motor at low speed without forced cooling. Break in motor thermistor connection.
18 CURRENT LIMIT	Cause: Software overcurrent trip. Current exceeds 180% of stack rated current for 1 second. Remedy: Remove the shock load. ACCEL TIME and/or FIXED BOOST set too high. DECEL TIME set too low.
20 24V FAILURE	Cause: 24V failure on terminal 6. Remedy: Output overload (warning only). 150mA maximum either individually or as the sum of terminals 6 & 10.
21 LOW SPEED OVER I	Cause: The motor is drawing too much current (>100%) at zero output frequency. Remedy: FIXED BOOST level set too high.
22 10V FAULT	Cause: 10V fault. Remedy: +10V REF overload warning (terminal 4) - 10mA maximum.
24 DESAT (OVER I)	Cause: Desaturation (Instantaneous overcurrent). Remedy: Refer to OVERCURRENT entry in this table.
25 DC LINK RIPPLE	Cause: The dc link ripple voltage is too high. Remedy: Check for a missing input phase.
26 BRAKE SHORT CCT	Cause: Brake resistor overcurrent. Remedy: Check brake resistor value is greater than minimum allowed.
27 OVERSPEED	Cause: Overspeed detected. Remedy: >150% base speed when in Sensorless Vector mode.
28 ANOUT FAULT	Cause: AOUT overload on terminal 5. Remedy: Current exceeded 10mA maximum.
29 DIGIO 1 (T9) FAULT	Cause: DIN3 overload on terminal 9. Remedy: Current exceeded 20mA maximum.
30 DIGIO 2 (T10) FAULT	Cause: DOUT2 overload on terminal 10. Remedy: 150mA maximum either individually or as the sum of terminals 6 & 10.
31 UNKNOWN	Cause: Unknown trip. Remedy: Consult technical support.
32 OTHER	Cause: "OTHER" trip is active. Remedy: Refer to Trip ID 34 to 44 inclusive.
34 MAX SPEED LOW	Cause: During Autotune, MAX SPEED RPM limits speed to less than nameplate speed. Remedy: Increase the value of MAX SPEED RPM up to the nameplate rpm of the motor (as a minimum). It may be reduced, if required, after the Autotune is complete.
35 MAIN VOLTS LOW	Cause: The mains input voltage is not sufficient to carry out the Autotune. Remedy: Re-try when the mains has recovered.
36 NOT AT SPEED	Cause: The motor was unable to reach the required speed to carry out the Autotune. Remedy: Check if motor shaft is free to turn. Check if the motor data is correct.
37 MAG CURRENT FAIL	Cause: Not possible to find a suitable value of magnetising current. Remedy: Check the motor data is correct (nameplate rpm and motor volts). Check that the motor is correctly rated for the drive.
38 NEGATIVE SLIP F	Cause: Autotune calculated a negative slip frequency (invalid). Remedy: Check nameplate rpm, base frequency, and pole pairs are correct. Ensure Nameplate rpm is not set higher than base speed.
39 TR TOO LARGE	Cause: The calculated value of rotor time constant is too large. Remedy: Check the value of nameplate rpm.
40 TR TOO SMALL	Cause: The calculated value of rotor time constant is too small. Remedy: Check the value of nameplate rpm.
41 MAX RPM DATA ERR	Cause: MAX SPEED RPM is set outside the Autotune data range (30% beyond previous max). Remedy: Re-autotune with MAX SPEED RPM set to a higher value.
42 LEAKGE L TIMEOUT	Cause: The motor must be stationary when starting the Autotune. Remedy: Ensure motor is stopped before starting Autotune.
43 MOTOR TURNING ERR	Cause: The motor must be able to rotate during Autotune. Remedy: Uncouple load or unlock brake if preventing rotation.
44 MOTOR STALL ERR	Cause: Leakage inductance measurement failed; required current level not achieved. Remedy: Check that the motor is wired correctly.
- Product Code Error	Cause: Product identification failure. Remedy: Switch unit off/on. If persistent, return unit to factory.
- Calibration Data Error	Cause: Calibration data corruption. Remedy: Switch unit off/on. If persistent, return unit to factory.
- Configuration Data Error	Cause: Configuration data corruption. Remedy: Press the E key to accept the default configuration. If persistent, return unit to factory.

 

How to Read Parker AC650V Faults via DSE Lite

To get the most accurate diagnostic data in 2026, it is recommended to bypass the keypad and connect your PC to the drive using the Parker Drive System Explorer Lite (DSE Lite) software. The connection is made via the P3 programming port located directly behind the removable keypad.

Key Diagnostic Features:

• Trip History Log: The AC650V stores the last 10 trip events. Accessing the “Trips History” folder in DSE Lite allows you to see the chronological order of faults, which is vital for identifying cascading failures.
• Vector Status Monitoring: Because the 650V utilizes vector control, you can monitor specific parameters like Magnetizing Current and Torque Current. A trip on “OVER I” (Overcurrent) can often be traced back to incorrect motor tuning in the Vector menu.
• Real-Time Configuration View: Use DSE Lite to view the internal block diagram. This allows you to see if a trip is being generated by a “Remote Trip” input or an internal protection algorithm.

Frequently Asked Questions (FAQ)

Q: What is the difference between an Alarm and a Trip on the 650V?

A:

• Alarms (e.g., ATN): These are warnings that the drive is reaching a limit (like an Ixt Stall) but will keep running. The display will flash to alert the operator.
• Trips (e.g., OC): These are critical faults that immediately disable the drive output to protect the power stack. The motor will coast to a stop.

Q: How do I reset a Parker AC650V fault?

A: Once the fault condition has been cleared, you can reset the drive by:

1. Pressing the red STOP/RESET button on the keypad.
2. Toggling the Digital Input assigned to “Trip Reset” (typically DIN3 in the standard factory macro).
3. Cycling the main 3-phase power (Wait 30 seconds for the DC bus to discharge).

Q: What does “DC LINK RIPPLE” indicate?

A: This is a common trip on the 650V series. It indicates that the DC bus voltage is not smooth, usually caused by a blown input fuse, a dropped phase from the mains supply, or failing electrolytic capacitors within the drive. Check your incoming power first.