Danfoss VLT AutomationDrive FC 303 User Manual (English)

Questions and Answers:

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Kelly MyersAug 17, 2025
What to do if my Danfoss VLT AutomationDrive FC 303 DC Drives display is dark?
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  Amanda NelsonAug 17, 2025
  If the Danfoss DC Drives display is dark, it could be due to several reasons. First, check the input power source. Also, check for missing or open fuses, or a tripped circuit breaker. Ensure there is power to the LCP and that there isn't a short circuit on the control voltage terminals. Verify you are using the correct LCP model (LCP 101 or LCP 102). Adjust the contrast by pressing [Status] + Up/Down arrows. If none of these steps work, the display (LCP) or the internal voltage supply might be defective.
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alyonsAug 20, 2025
Why is my Danfoss VLT AutomationDrive FC 303 DC Drives motor not running?
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  ehillAug 20, 2025
  If your Danfoss DC Drives motor isn't running, there might be a few reasons. Check if the service switch is open or if the motor connection is missing, and correct it. If you're using a 24V DC option card, ensure line power is applied to run the unit. If LCP Stop is active, press [Auto On] or [Hand On], depending on your operation mode, to start the motor. Also, check for a missing start signal and apply a valid one. Ensure the motor coast signal isn't active by applying 24V on terminal 27 or programming this terminal to No operation. Finally, verify that the reference signal source is correctly configured.
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David RamirezAug 22, 2025
What to do if Danfoss VLT AutomationDrive FC 303 DC Drives open power fuses or circuit breaker trip?
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  Pamela SmithAug 22, 2025
  If the power fuses are open or the circuit breaker trips in your Danfoss DC Drives, it could be due to a phase-to-phase short. Eliminate any shorts detected. Another cause could be motor overload, so review the specifications for the application. Also, check for and tighten any loose connections.
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Crystal HamiltonAug 26, 2025
Why is my Danfoss DC Drives motor running in the wrong direction?
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  Dr. Timothy WallaceAug 26, 2025
  If your Danfoss DC Drives motor is running in the wrong direction, it could be due to a motor rotation limit, so program correct settings. Another reason may be an active reversing signal, so deactivate it. Also, check for a wrong motor phase connection.
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Robert LeeAug 28, 2025
What to do if my Danfoss VLT AutomationDrive FC 303 DC Drives motor speed is unstable?
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  wcastroAug 28, 2025
  If you notice that the speed of your Danfoss DC Drives motor is unstable, it may be due to incorrect parameter settings. Check the settings in parameter group 1-6* Analog I/O mode. For closed-loop operation, verify the settings in parameter group 20-0* Feedback.
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Amanda SimpsonAug 31, 2025
How to solve line power current imbalance in Danfoss VLT AutomationDrive FC 303 DC Drives?
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  Dominique NavarroAug 31, 2025
  If you are experiencing a line power current imbalance greater than 3% in your Danfoss DC Drives, it could be a problem with the line power itself. If the imbalanced leg follows the wire, check the line power supply. If the imbalance remains on the same input terminal, it could indicate a problem with the Adjustable frequency drive unit.
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Jennifer TaylorSep 3, 2025
What to do if my Danfoss VLT AutomationDrive FC 303 DC Drives motor is not reaching maximum speed?
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  Sandra RushSep 3, 2025
  If your Danfoss DC Drives motor is not reaching its maximum speed, it may be because the frequency limits are set incorrectly. Program correct limits. Alternatively, the reference input signal might not be scaled correctly; in this case, program correct settings.
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Nathan BrowningSep 5, 2025
How to fix intermittent display on Danfoss DC Drives?
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  April RogersSep 5, 2025
  If the display on your Danfoss DC Drives is intermittent, it could be due to an overloaded power supply (SMPS) caused by improper control wiring or a fault within the Adjustable frequency drive. If the display stays lit, check the control wiring for shorts or incorrect connections. If the display continues to cut out, follow the procedure for a dark display.
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Christopher MartinezSep 8, 2025
Why is there motor current imbalance in my Danfoss VLT AutomationDrive FC 303?
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  Robert GomezSep 8, 2025
  If there's a motor current imbalance greater than 3% in your Danfoss DC Drives, the problem might be with the motor or its wiring. If the imbalanced leg follows the wire, inspect the motor and motor wiring. However, if the imbalance remains on the same output terminal, it suggests an issue with the drive unit itself.
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Patrick BrownSep 12, 2025
What causes rough motor running in Danfoss VLT AutomationDrive FC 303?
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  Samantha BriggsSep 12, 2025
  If your Danfoss DC Drives motor runs rough, it could be due to possible overmagnetization. Check the motor settings in parameter groups 1-2* Motor data, 1-3* Adv motor data, and 1-5* Load indep. setting.

Danfoss VLT AutomationDrive FC 303 Specifications

General

Category	DC Drives
Output Voltage	0 to Input Voltage
Power Range	0.25 kW
Control Method	VVCplus, Flux Vector Control
Communication Protocols	Ethernet/IP, Modbus RTU, Profibus, CANopen, DeviceNet
Enclosure Type	IP20, IP21
Protection Features	Overcurrent, Overvoltage, Undervoltage, Short Circuit, Ground Fault, Overtemperature
Ambient Temperature	-10 to +50 °C
Storage Temperature	-25°C to 70°C
Relative Humidity	5-95% non-condensing
Altitude	Up to 1000 m without derating