Danfoss VLT FC301_FC302 Fault Codes

Fault codes, causes, and solutions for Danfoss VLT FC301_FC302 AC Variable Frequency Drive.

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Drive Type
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Manufacturer
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Model
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Fault Codes

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Danfoss VLT FC301_FC302 AC Variable Frequency Drive Fault Codes
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1
10 Volts low
2
Live zero error
3
No motor
4
Mains phase loss
5
DC link voltage high
6
DC link voltage low
7
DC overvoltage
8
DC undervoltage
9
Inverter overload
10
Motor overload temperature
11
Motor thermistor overtemp
12
Torque limit
13
Overcurrent
14
Ground fault
15
Hardware mismatch
16
Short-circuit
17
Control word timeout
22
Hoist mechanical brake
23
Internal fan fault
24
External fan fault
25
Brake resistor short-circuit
26
Brake resistor power limit
27
Brake chopper fault
28
Brake check failed
29
Heatsink temp
30
Motor phase U missing
31
Motor phase V missing
32
Motor phase W missing
33
Inrush fault
34
Fieldbus communication fault
36
Mains Failure
38
Internal fault
39
Heatsink sensor
40
Overload of digital output terminal 27
41
Overload of digital output terminal 29
42
Overload of digital output on X30/6 or overload of digital output on X30/7
46
Power card supply
47
24 V supply low
48
1.8 V supply low
49
Speed limit
50
AMA calibration failed
51
AMA check Unom and Inom
52
AMA low Inom
53
AMA motor too big
54
AMA motor too small
55
AMA Parameter out of range
56
AMA interrupted by user
57
AMA internal fault
58
AMA internal fault
59
Current limit
60
External interlock
61
Tracking error
62
Output frequency at maximum limit
64
Voltage Limit
65
Control card over temperature
66
Heatsink temperature low
67
Option module configuration has changed
68
Safe Stop activated
69
Power card temperature
70
Illegal adjustable frequency drive configuration
71
PTC 1 safe stop
72
Dangerous failure
73
Safe stop auto restart
76
Power unit set-up
77
Reduced power mode
79
Illegal power section configuration
80
Drive initialized to default value
81
CSIV corrupt
82
CSIV par. err.
85
Dang fail PB
104
Mixing fan fault
243
Brake IGBT
244
Heatsink temperature
245
Heatsink sensor
246
Power card supply
247
Power card temperature
248
Illegal power section configuration
250
New spare part
251
New type code

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?