Parker AC15 Drive Fault Codes

Troubleshoot your Parker AC15 drive with our updated fault code list. Learn to interpret keypad Trip messages, use DSE Lite, and minimize downtime effectively.

Parker AC15 Fault Codes Reference Table

Below is the complete list of trip and warning messages. Please refer to the specific code (e.g., Fxxx) or text message displayed on your drive’s keypad.

Fault Code	Cause & Solution
1 Over Voltage dCHI (tr1)	The drive internal dc link voltage is too high: - 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 To help prevent this trip, enable the DC Link Volts Limit feature Internal dc link voltage has reached midway between the over voltage trip level and the dynamic braking resistor control voltage.
2 Under Voltage dCLO (tr2)	DC link low trip: - Supply is too low/power down Internal dc link voltage has reached midway between the lowest expected instantaneous voltage and the undervoltage trip level.
3 Stack Over I S-OC (tr3)	The motor current exceeded the capabilities of the power stack. - Instantaneous overcurrent detected by the power stack. Refer to OVERCURRENT in this table.
4 Over Current d-OC (tr4)	The motor current being drawn from the drive is too high: - Trying to accelerate a large inertia load too quickly; ACCEL TIME time too short - Trying to decelerate a large inertia load too quickly; DECEL TIME time too short - Application of shock load to motor - Short circuit between motor phases - 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 The over current trip uses a multiple-attempt strategy. The warning is triggered if two or more consecutive overcurrent events are encountered (whereas five consecutive events are required for a Trip to occur).
5 Current Lim C2HI (tr5)	V/Hz mode only: If the current exceeds 200% of stack rated current for a period of 1 second, the drive will trip. - This is caused by shock loads.
6 Motor Stall StLL (tr6)	The motor has stalled (not rotating) Drive in current limit >200 seconds: - Motor loading too great - FIXED BOOST level set too high The stall condition has been detected for more than half of the configured Stall Time.
7 Inverse Time dI2t (tr7)	A prolonged overload condition, exceeding the Inverse Time allowance, has caused the trip: - Remove the overload condition An overload condition has exceeded one half of the Inverse Time allowance.
8 Motor I2t I2t (tr8)	Only for PMAC Motor: A prolonged load condition, exceeding the motor rated current, has caused the trip. The estimated motor load has reached a value of 105% An overload condition has exceeded one half of the motor Inverse Time allowance.
9 Low Speed I LSPd (tr9)	The motor is drawing too much current (>100%) at zero output frequency: - FIXED BOOST level set too high.
10 Heatsink Temp dHot (tr10)	Drive heatsink temperature too high - The ambient air temperature is too high - Poor ventilation or spacing between drives - Check heatsink fan is rotating The drive heatsink has exceeded the warning temperature level (which is approx. 10°C below the trip temperature).
11 Internal Temp IHot (tr11)	Processor temperature or ambient temperature within the power stage too high - The ambient temperature in the drive is too high The drive processor temperature has exceeded the warning temperature level (which is approx. 10°C below the trip temperature).
12 Motor Temp Hot (tr12)	The motor temperature is too high - 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 - No link fitted to thermistor terminals on drive The motor has been over temperature for 7.5 second.
13 Dynamic Brake db r (tr13)	External dynamic brake resistor has been overloaded: - Trying to decelerate a large inertia too quickly or too often Note that Dynamic Brake is a warning only. The drive will continue to operate and may eventually trip on ‘Over Voltage’ if action is not taken. The power calculation for the external resistor has exceeded one half of the Brake Overrating allowance.
14 Digout Load dOLd (tr14)	24V output voltage dropped by Digital output overload > 50mA: - connect 24V user supply voltage - Decrease output load
15 Anin 1 Over AIP1 (tr15)	Analog Input current > 30mA (Overload detected only in Current Mode) - Analog Input 1 overload detected once.
16 Anin 2 Over AIP1 (tr16)	Analog Input current > 30mA (Overload detected only in Current Mode) - Analog Input 2 overload detected once.
17 Contactor COnt (tr17)	DC Link failed to reach the undervoltage trip level within the contactor feedback time. - The Line contactor failed to connect. - Missing 3-phase line supply
18 Phase Fail PhF (tr18)	Indicates a missing input phase.
19 Output Phase OPhF (tr19)	Motor Output Phase is missing. - Motor Phase not connected. - Current sensor missing or not correctly connected - Motor Output phase only trips in V/Hz mode, if setpoint is >5Hz
20 Vdc Ripple dCrP (tr20)	The DC link ripple voltage is too high: - Check for a missing input phase - Repetitive start / stop or forward reverse action. The dc link ripple has exceeded 75% of the trip level.
21 Pwr Loss Stop PLS (tr21)	A Power Loss Ride Through sequence has occurred and either 0315 Pwrl Time Limit has been exceeded or the motor speed has reached a zero speed during the sequence.
22 Overspeed OSPd (tr22)	Overspeed: - >150% base speed when in Sensorless Vector mode.
23 PMAC Speed PSPd (tr23)	Only for PMAC motor : When using the Start feature in Sensorless Vector Control, the real speed hasn’t reached the speed setpoint after 5 seconds to move from open to closed loop control or to move from closed to open loop.
24 Speed Sensor SPdS (tr24)	Not applicable
25 Speed Error SPdE (tr25)	Difference between actual motor speed and the speed setpoint is greater than a threshold for a period of time. - Difference between actual motor speed and the speed setpoint has been greater than the trip threshold for more than half the trip delay time.
26 Feedback Err EnCE (tr26)	Not applicable
27 Command Loss dISP (tr27)	Communication lost - Connection to Remote Keypad lost, check cable.
28 Comms Break CbrE (tr28)	Lost option communications: - A break in option communications has been detected. Refer to option communications manual.
29 Base Modbus BBUS (tr29)	Lost Base Modbus communications: - A break in the Base Modbus communications has been detected.
30 Fieldbus FBUS (tr30)	Cause: A loss of connection to a fieldbus master has been detected. Solution: - Check cable to fieldbus master, - Check state of fieldbus master. Also EMC problems are possible
31 STO Active STO (tr31)	Cause: Attempt to run the motor with the Safe Torque Off active Solution: - Check the STO wiring. - It may be necessary to power the drive off and on to completely clear this event. Note that this alarm may also appear if the STO inputs are connected to the 24V output of the inverter, and the maximum 50mA current allowance on the 24V output has been exceeded.
32 External Trip Etri (tr32)	The external (application) trip input is high: - Refer to the application description to identify the source of the signal.
33 A1 A1 (tr33) Application trip 1	The application trips are controlled by the Application_Trips block in the configuration.
34 A2 (tr34) Application trip 2	The application trips are controlled by the Application_Trips block in the configuration.
35 A2 (tr35) Application trip 3	The application trips are controlled by the Application_Trips block in the configuration.
36 A4 (tr36) Application trip 4	The application trips are controlled by the Application_Trips block in the configuration.
37 CPU Loading CPU (tr37)	Cause: Combination of high switching frequency, high network traffic and complicated configuration. Solution: Reduce the Ethernet load or reduce the switching frequency. Time-based warning issued at least 0.5s before the trip.
ALERT 1 RUNTIME ALERT rtA (AL1)	Runtime Alerts indicate a firmware or hardware error
ALERT 2 DEFAULTS LOADED AL02 (AL2)	Reset to default request completed
ALERT 3 FIRE MODE AL03 (AL3)	Fire Mode has been activated
ALERT 4 COAST TO STOP CStp (AL5)	Attempting to start the drive in local mode with Coast To Stop active
ALERT 5 ENABLE VOLTAGE EU0L(AL5)	Attempting to start the drive in local mode with the Enable input low
ALERT 6 QUICKSTOP ACTIVE FStp (AL6)	Attempting to start the drive in local mode with Quick Stop active
ALERT 7 OPERAT ENABLED EnOp (AL7)	Attempting to change from Local to Remote with the Run signal true
ALERT 8 DC LINK VOLTAGE U0LT (AL8)	The pre-charge relay is not closed, (Low DC Link volts)
9 RESERVED
ALERT 10 MBUS MAPPING ERR PD01 (AL10)	Refer to section ‘Modbus TCP Config’
ALERT 11 LOCAL REMOTE1 L	Displayed while changing from local to remote control
ALERT 12 LOCAL REMOTE2 LO	Displayed while changing from local to remote control
ALERT 13 LOCAL REMOTE3 LOC	Displayed while changing from local to remote control
ALERT 14 FIRMWARE UPGRADE F Upd (AL14)	Firmware upgrade in progress
ALERT 15 FIRE MODE ACTIVE FIrE (AL15)	Fire Mode has been activated
ALERT 16 DEFAULTS LOADED LdEF (AL16)	Reset to default request completed
ALERT 17 CONFIG FAULT COnF (AL17)	Invalid DSELite configuration installed
ALERT 18 MAX SPD GT ATN nSpd (AL18)	Attempting to run at speed greater than the autotuned speed
ALERT 19 PARAMETERS SAVED SAUE (AL19)	Parameter Save completed successfully
ALERT 20 OPTC MAPPING ERR pD02 (AL20)	Invalid Modbus TCPIP fieldbus mapping
ALERT 21 EIP MAPPING ERR pD03 (AL21)	Invalid Ethernet IP fieldbus mapping
ALERT 22 PNIO MAPPING ERR pD04 (AL22)	Not Implemented
ALERT 23 STD APP LOADED ApLD (AL23)	Request to load application macro completed
Alert 25 Tests Disabled tdIS (AL25)	Cause: All auto tune tests are disabled Check parameter 0038: Atn Test Solution: Disable and parameter 0042: Atn PMAC Disable.
Alert 26 Autotune in Progress Atn (AL26)	Autotune routine active
Alert 27 Leakage L Timeout LEAt (AL27)	Cause: The autotune has attempted to determine the leakage inductance of the motor but cannot make the required test current. Solution: Problem with motor connection.
Alert 28 Motor Stalled StAL (AL28)	Cause: Inverter cannot produce enough torque to turn motor. Solution: Check motor is free to rotate.
Alert 29 Motor Turning Err Turn (AL29)	Cause: The autotune is trying to find the encoder direction by spinning the motor, but the motor is already spinning. Solution: Wait till the motor stops.
Alert 30 Neg Slip Freq nSLp (AL30)	Cause: - Autotune has calculated a negative slip frequency, which is not valid. - Nameplate rpm may have been set to a value higher than the base speed of the motor. Solution: - Check nameplate rpm, base frequency, and pole pairs are correct.
Alert 31 Tr Too Large Tr2L (AL31)	Cause: The calculated value of rotor time constant is too large. Solution: Check the values of Nameplate Speed and Base Frequency.
Alert 32 Tr Too Small Tr2S (AL32)	Cause: The calculated value of rotor time constant is too small. Solution: Check the values of Nameplate speed and Base Frequency.
Alert 33 Max Speed 2 Low Sp2L (AL33)	Cause: During Autotune the motor is required to run at the nameplate speed of the motor. If 100% Speed in RPM parameter limits the speed to less than this value, an error will be reported. Solution: Increase the value of Max Speed parameter 0457 up to the nameplate rpm of the motor (as a minimum). It may be reduced, if required, after the Autotune is complete.
Alert 34 Supply Volts Low SuOL (AL34)	Cause: The autotune will compensate for low supply volts, down to 70% of motor rated volts. Below this value it will stop the autotune and raise an alert. Solution: Re-try when mains volts are within specification.
Alert 35 Not At Speed nSpd (AL35)	Cause: The motor was unable to reach the required speed to carry out the Autotune within 10 seconds. Solution: Possible reasons include: motor shaft not free to turn; the motor data is incorrect.
Alert 36 Mag I Err InAg (AL36)	Cause: The terminal volts have failed to reach the requested value after 40 seconds. Solution: - Check the motor data is correct, especially nameplate rpm and motor volts. - Check that the motor is correctly rated for the drive.
Alert 38 Ke Too Large EnFL (AL38)	Cause: Ke value calculated during the autotune (stationary) is too large (the max value is 840V) Solution: - Check the motor data is correct, especially nameplate rpm, rated amps and motor volts. - If low speed motor with a Ke value higher than 840V, enter by hand the corresponding value after the autotune completion.
Alert 39 Ke Too Small EnFS (AL39)	Cause: Ke value calculated during the autotune (stationary) is too small (the min value is 1V) Solution: Check the motor data is correct, especially nameplate rpm, rated amps and motor volts.
Alert 40 MRAS Para Calc nCAL (AL40)	Cause: Unable to calculate MRAS parameters. Solution: Check the motor data is correct, especially nameplate rpm, rated amps and motor volts.
RUNTIME ALERT rtA 1 to 999 Internal Exception	• Option not secured correctly to control card. • Earth bonding failure. • Fault during firmware upgrade. • Hardware failure.
RUNTIME ALERT rtA 1001 to 1003 Processor Overload	• Select a lower switching frequency.
RUNTIME ALERT rtA 1006 Memory Stack	• Reduce the complexity of the application. • Reduce the number of parameters accessed via ethernet. • Reduce the number of parameters accessed by the fieldbus option.
RUNTIME ALERT 1010 rtA Uninitialized task	• Record the error message and contact Technical Support
RUNTIME ALERT rtA 1200 to 1205 Communications Option Error	• 24V aux supply missing (frame 6-10 only) • Ensure the communications option is correctly fitted. • Update the firmware in the inverter. • Replace the communications option
RUNTIME ALERT rtA 1300 to 1350 Ethernet Fault	• Record the error message and contact Technical Support.
RUNTIME ALERT rtA 2000 to 2002 Memory Allocation	• Record the error message and contact Technical Support.

 

How to Read Parker AC15 Faults via DSE Lite

While the AC15’s onboard keypad provides immediate visual feedback, connecting your PC to the drive using the Parker Drive System Explorer Lite (DSE Lite) software yields the most accurate diagnostic data for 2026. The AC15 comes standard with onboard Ethernet, allowing for seamless connectivity without specialized serial cables.

Key Diagnostic Features:

• Trip Log: Access the internal history to view the last 10 trip events. This is critical for diagnosing intermittent issues that may have cleared before you arrived at the panel.
• Real-Time Monitoring: Use DSE Lite to monitor the “Trips Status” parameter in real-time. This indicates exactly which protection logic (e.g., Overcurrent, Stall, Over Voltage) triggered the stop.
• Oscilloscope Function: The software’s built-in scope allows you to trace variables like motor current and DC bus voltage, helping you identify if a trip was caused by a sudden load spike or a power supply fluctuation.

Frequently Asked Questions (FAQ)

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

A: The AC15 distinguishes between these two states:

• Alarms (e.g., ALxx): These warn of a potential issue (like “Motor Over Temperature”) but allow the drive to continue running. The display may flash an alarm code.
• Trips: These are critical faults that immediately stop the drive output to protect the hardware. The drive will require a reset before it can restart.

Q: How do I reset a Parker AC15 fault?

A: After correcting the root cause of the fault, you can reset the drive by:

1. Pressing the STOP/RESET button on the integrated keypad.
2. Toggling a Digital Input configured for “Remote Trip Reset.”
3. Sending a reset command via the onboard Ethernet (Modbus TCP/IP or Ethernet/IP) network.

Q: Does the AC15 support Safe Torque Off (STO)?

A: Yes, the AC15 typically includes STO functionality. If the drive displays an STO-related trip, check that the safety circuit inputs (STO1 and STO2) are correctly energized and that the emergency stop button is released.