NIDEC or Control Techniques Mentor MP Fault Codes

Fault codes, causes, and solutions for NIDEC or Control Techniques Mentor MP DC Drive.

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NIDEC or Control Techniques Mentor MP DC Drive Fault Codes
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AOC (3)
Instantaneous output over current detected: Peak current greater than 225 %
AOP (158)
Voltage has been applied to the armature but no current feedback has been detected
AtL Err (161)
Power processor armature timing loop cannot operate with the current PLL synchronization and the firing angle demand
C.Acc (185)
SMARTCARD trip: SMARTCARD Read / Write fail
C.boot (177)
SMARTCARD trip: The menu 0 parameter modification cannot be saved to the SMARTCARD because the necessary file has not been created on the SMARTCARD
C.bUSY (178)
SMARTCARD trip: SMARTCARD can not perform the required function as it is being accessed by a Solutions Module
C.Chg (179)
SMARTCARD trip: Data location already contains data
C.cPr (188)
SMARTCARD trip: The values stored in the drive and the values in the data block on the SMARTCARD are different
C.dAt (183)
SMARTCARD trip: Data location specified does not contain any data
C.Err (182)
SMARTCARD trip: SMARTCARD data is corrupted
C.Full (184)
SMARTCARD trip: SMARTCARD full
cL2 (28)
Analog input 2 current loss (current mode)
cL3 (29)
Analog input 3 current loss (current mode)
CL.bit (35)
Trip initiated from the control word (Pr 6.42)
C.OPtn (180)
SMARTCARD trip: Solutions Modules installed are different between source drive and destination drive
C.Prod (175)
SMARTCARD trip: The data blocks on the SMARTCARD are not compatible with this product
C.Rdo (181)
SMARTCARD trip: SMARTCARD has the Read Only bit set
C.rtg (186)
SMARTCARD trip: The voltage and/or current rating of the source and destination drives are different
C.TyP (187)
SMARTCARD trip: SMARTCARD parameter set not compatible with drive
dESt (199)
Two or more parameters are writing to the same destination parameter
EEF (31)
EEPROM data corrupted - Drive mode becomes open loop and serial comms will timeout with remote keypad on the drive RS485 comms port.
EnC1 (189)
Drive encoder trip: Encoder power supply overload
EnC2 (190)
Drive encoder trip: Wire break
EnC3 (191)
Drive encoder trip: Overload
EnC9 (197)
Drive encoder trip: Position feedback is selected from a Solutions Module slot which does not have a speed / position feedback Solutions Module installed
EnC10 (198)
Drive encoder trip: Termination overload
Et (6)
External trip
FbL (159)
No feedback from the tachogenerator or encoder
Fbr (160)
The polarity of the feedback tachogenerator or encoder is incorrect
FdL (168)
No current in the field supply circuit
FOC (169)
Excess current detected in field current feedback
F.OVL (157)
Field I²t overload
HF01
Data processing error: CPU address error
HF02
Data processing error: DMAC address error
HF03
Data processing error: Illegal instruction
HF04
Data processing error: Illegal slot instruction
HF05
Data processing error: Undefined exception
HF06
Data processing error: Reserved exception
HF07
Data processing error: Watchdog failure
HF08
Data processing error: Level 4 crash
HF09
Data processing error: Heap overflow
HF10
Data processing error: Router error
HF11
Data processing error: Access to EEPROM failed
HF12
Data processing error: Main program stack overflow
HF17 (217)
Data processing error: No Comms from power processor
HF18 (218)
Bucket suppressor capacitor failure
HF19 (219)
Overheat on bucket suppressor or snubber circuits
HF20 (220)
Power stage recognition: identification code error
HF21 (221)
Power processor: Watchdog failure
HF22 (222)
Power processor: Undefined exception
HF23 (223)
Power processor: Current control level 1 over-run
HF24 (224)
Power processor: Current control level 2 over-run
HF25 (225)
Power processor: Background over-run
HF27 (227)
Power circuit: Thermistor 1 fault
HF28 (228)
Power software not compatible with user software
HF29 (229)
User processor: Armature timing error
It.AC (20)
I²t on drive output current (Refer to Pr 4.16)
O.ht1 (21)
Drive overheat (thyristor junction) based on thermal model
O.ht2 (22)
Heatsink over temperature
O.ht3 (27)
External discharge resistor over temperature
O.Ld1 (26)
Digital output overload: total current drawn from 24 V supply and digital outputs exceeds 200 mA
O.SPd (7)
Motor speed has exceeded the over speed threshold
PAd (34)
Keypad has been removed when the drive is receiving the speed reference from the keypad
PLL Err (174)
Phase Lock Loop cannot lock to the auxiliary supply
PS (5)
Internal power supply fault
PS.10V (8)
10 V user power supply current greater than 10 mA
PS.24V (9)
24 V internal power supply overload
PSAVE.Er (37)
Power down save parameters in the EEPROM are corrupt
SAVE.Er (36)
User save parameters in the EEPROM are corrupt
SCL (30)
Drive RS485 serial comms loss to remote keypad
SL (170)
AC input phase loss
SLAVE.Er (156)
Slave tripped in parallel system
SLX.dF (204,209,214)
Solutions Module slot X trip: Solutions Module type installed in slot X changed
SLX.Er (202,207,212)
Solutions Module slot X trip: Solutions Module in slot X has detected a fault
SLX.HF (200,205,210)
Solutions Module slot X trip: Solutions Module X hardware fault
SLX.nF (203,208,213)
Solutions Module slot X trip: Solutions Module has been removed
SL.rtd (215)
Solutions Module trip: Drive mode has changed and Solutions Module parameter routing is now incorrect
SLX.tO (201,206,211)
Solutions Module slot X trip: Solutions Module watchdog timeout
S.Old (171)
The maximum power the over voltage suppressor can handle has been exceeded
S.OV (172)
Excessive suppressor voltage
t002 (2)
Reserved
t004 (4)
Reserved
t010 (10)
Reserved
t019 (19)
Reserved
t023 (23)
User trip
t032 (32)
Reserved
t032 to t033 (32 to 33)
Reserved
t038 to t039 (38 to 39)
Reserved
t040 to t089 (40 to 89)
User trip
t099 (99)
User trip defined in 2nd processor Solutions Module code
t101 (101)
User trip
t102 to t111 (102 to 111)
Reserved
t112 to t156 (112 to 156)
User trip
t161 to t167 (161 to 167)
Reserved
t176 (176)
Reserved
t192 to t196 (192 to 196)
Reserved
t216 (216)
User trip
th (24)
Motor thermistor trip
th.Err (173)
Missing thyristor
thS (25)
Motor thermistor short circuit
tunE (18)
Autotune stopped before completion
tunE1 (11)
The position feedback did not change or required speed could not be reached during the inertia test (see Pr 5.12 (SE13, 0.34))
tunE2 (12)
Position feedback direction incorrect or motor could not be stopped during the inertia test (See Pr 5.12 (SE13, 0.34))
tunE3 (13)
Field flux has not decayed to zero during autotune
tunE4 (14)
Back emf detected during autotune
tunE5 (15)
No field current detected during autotune
tunE6 (16)
Cannot achieve ¼ rated back emf during autotune
tunE7 (17)
Rotating autotune initiated with Estimated speed selected
UP ACC (98)
Onboard PLC program: cannot access Onboard PLC program file on drive
UP div0 (90)
Onboard PLC program attempted divide by zero
UP OFL (95)
Onboard PLC program variables and function block calls using more than the allowed RAM space (stack overflow)
UP ovr (94)
Onboard PLC program attempted out of range parameter write
UP PAr (91)
Onboard PLC program attempted access to a non-existent parameter
UP ro (92)
Onboard PLC program attempted write to a read-only parameter
UP So (93)
Onboard PLC program attempted read of a write-only parameter
UP udF (97)
Onboard PLC program un-defined trip
UP uSEr (96)
Onboard PLC program requested a trip
UV (1)
The drive is running from the external 24 V supply

About Drive Fault Codes

Both AC Variable Frequency Drives (VFDs) and DC Drives display fault codes when they encounter operational issues. These codes help technicians diagnose and resolve problems quickly. This tool provides fault codes, descriptions, causes, and solutions for various drive manufacturers and models.

If you can't find your specific drive model or the fault code you're experiencing, please refer to the manufacturer's documentation or contact technical support.

Understanding Drive Fault Codes

What are Drive Fault Codes?

Drive fault codes are diagnostic messages displayed by AC and DC drives to indicate specific errors or malfunctions. These codes are essential for troubleshooting and maintaining industrial motor control systems. Each manufacturer uses unique code formats, but they generally point to similar issues like overvoltage, undervoltage, overcurrent, overheating, or communication failures.

Common Drive Types

AC Variable Frequency Drives (VFDs)

VFDs control AC motors by adjusting frequency and voltage to regulate motor speed and torque. They are widely used in applications requiring variable speed control with energy efficiency.

  • Control both speed and torque
  • Energy-efficient operation
  • Smooth acceleration/deceleration
  • Regenerative braking capabilities

DC Drives

DC drives control DC motors by adjusting the armature voltage and sometimes the field current. They excel in applications requiring high starting torque and precise speed control.

  • High starting torque
  • Simple control architecture
  • Wide speed range control
  • Quick response to command changes

Common Drive Fault Categories

Power-Related Faults

  • Input phase loss
  • Overvoltage during acceleration/deceleration
  • Undervoltage conditions
  • DC bus voltage issues

Thermal Faults

  • Drive overheating
  • Motor overtemperature
  • Heatsink thermal issues
  • Cooling system failures

Communication Faults

  • Fieldbus communication errors
  • Serial communication timeout
  • Network connection issues
  • Protocol compatibility problems

Motor/Load Faults

  • Motor overload
  • Output phase loss
  • Overcurrent during acceleration
  • Ground/earth faults

Troubleshooting Best Practices

When troubleshooting drive fault codes, always follow these best practices:

  1. Document the exact fault code and conditions when it occurred
  2. Check for simple issues first (loose connections, overloaded motor)
  3. Verify input power quality and stability
  4. Inspect the motor and load for mechanical issues
  5. Examine environmental conditions (temperature, humidity, dust)
  6. Consult manufacturer documentation for specific guidance

Popular Drive Manufacturers

Our database includes fault codes from leading drive manufacturers including:

  • ABB
  • Siemens
  • Allen Bradley / Rockwell Automation
  • Schneider Electric
  • Danfoss
  • Yaskawa
  • Mitsubishi Electric
  • Eaton
  • Emerson
  • Fuji Electric

For additional resources on drive maintenance and troubleshooting, check out our Drive Maintenance Guide and Motor Sizing Calculator.

Frequently Asked Questions

How do I reset a drive fault code?

What causes overcurrent faults in drives?

What's the difference between AC and DC drives?

Can I view fault history on a drive?

How can I prevent common drive faults?