Danfoss FC-302 Variable Frequency Drive Instruction Manual

Manual Danfoss FC-302 Variable Frequency Drive Instruction Manual

Danfoss FC-302 Variable Frequency Drive Instruction Manual

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Danfoss FC-302 Variable Frequency Drive

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Danfoss FC-302 Variable Frequency Drive

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Danfoss FC-302 VFD Instructions

Here we offer the Danfoss FC-302 Variable Frequency Drive manual completely free and in English. We have cataloged this manual in the Variable Frequency Drives section on Manualverse, and it has been rated by 1 users with an average rating of 5. If you have any specific questions about Danfoss FC-302 Variable Frequency Drive, we suggest checking the Frequently Asked Questions (FAQs) section of this manual.


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Danfoss FC-302 Variable Frequency Drive Specifications

Specification Value Notes
Product Line VLT® AutomationDrive FC 302 12-pulse variant
Supply Voltage Range 380–500 V ±10%
525–690 V ±10%
Multi-voltage support
Supply Frequency 50/60 Hz ±5% Standard grid frequencies
Output Voltage Range 0–100% of supply voltage Variable output voltage
Output Frequency Range 0–590 Hz Limited to 590 Hz from SW version 6.72 onwards (export control)
Continuous Output Current (HO/NO) 380-500V: 443 A (P250T5) to 1720 A (P1000T5)
525-690V: 380 A (P355T7) to 2002 A (P1M8T7)
Refer to power size and overload mode (High Overload/Normal Overload)
Starting Torque (Constant Torque) Maximum 150% for 60 s (once in 10 minutes) For high overload applications
Starting/Overload Torque (Variable Torque) Maximum 110% up to 0.5 s (once in 10 minutes) For normal overload applications
Enclosure Protection Rating IP21/Type 1, IP54/Type 12 Environmental protection ratings
Ambient Operating Temperature 0°C (32°F) to 45°C (113°F) at full continuous output
Up to 55°C (131°F) with derating
Operation with SFAVM switching mode
Storage/Transport Temperature -25 to +65/70°C (8.6 to 149/158°F) Wide temperature tolerance
Maximum Motor Cable Length (Shielded) 150 m (492 ft) For optimal EMC performance
Maximum Motor Cable Length (Unshielded) 300 m (984 ft) May not comply with EMC emission specifications
Digital Inputs 4 (programmable; 18, 19, 32, 33), with 2 additional (27, 29) programmable as input/output PNP or NPN logic, 0-24 V DC
Analog Inputs 2 (53, 54), configurable for voltage (-10V to +10V) or current (0/4-20mA) 10-bit resolution, 0.5% max error
Digital/Pulse Outputs 2 (27, 29), 0-24V, 40mA max current Max frequency 32 kHz
Analog Outputs 1 (42), 0/4-20mA current range 12-bit resolution, 0.5% max error
Relay Outputs 2 programmable (Relay 01, Relay 02) Galvanically isolated, up to 400V AC, 2A / 80V DC, 2A
Control Card DC Output (24V) 24 V +1, -3 V, 200 mA max load For auxiliary control components
Control Card DC Output (10V) 10.5 V ±0.5 V, 15 mA max load For potentiometers and reference signals
Communication Interfaces RS485 serial communication, USB serial communication Galvanically isolated for reliability
Efficiency Typically 0.98 High energy efficiency
Approvals & Certifications UL 508C, CE (for 1400–2000 kW, 690 V models) Complies with safety and performance standards

Danfoss FC-302 VFD Details

The Danfoss FC-302 VLT AutomationDrive is engineered to deliver high shaft performance for electric motors, crucial for industrial applications. Proper handling and adherence to operating instructions are essential to prevent malfunction, shorten lifetime, or other operational issues. This guide serves as a comprehensive resource for installation, programming, start-up, and troubleshooting, ensuring safe and efficient use.

Safety is paramount, with strict guidelines for qualified personnel to handle installation, start-up, and maintenance. The drive utilizes robust safety symbols for warnings and cautions. It also integrates a critical safety feature: Safe Torque Off (STO), requiring specific wiring and procedures detailed in supplementary documentation.

Mechanical installation planning is emphasized, considering ambient temperature, cooling methods, and proper unit positioning. The manual provides detailed instructions for lifting heavy units using dedicated lifting eyes and outlines precise mechanical dimensions for various enclosure sizes (F8–F15), facilitating optimal site preparation and space allocation for airflow and cable routing.

Electrical installation requires careful attention to grounding, power connections, and cable specifications. The FC-302 supports 12-pulse isolation transformers. It provides specific instructions for transformer selection, fuse requirements, and shielding against electrical noise. Proper wire access and isolation of mains, motor, and control cables are critical for EMC compliance and preventing nuisance trips.

The drive offers various panel options to enhance functionality and reliability. These include space heaters and thermostats for humidity control, cabinet lights with power outlets for improved visibility, and specialized modules like NAMUR terminals, Residual Current Devices (RCD), and Insulation Resistance Monitors (IRM) for advanced protection and monitoring in specific industrial environments.

Programming the FC-302 is primarily done via the Graphical Local Control Panel (LCP), featuring a clear display, menu, navigation, and operation keys. The Automatic Motor Adaptation (AMA) function is vital for optimizing dynamic motor performance, by automatically calibrating key motor parameters at standstill. The quick set-up procedure simplifies initial commissioning for various applications.

Advanced protection features extend beyond basic overload. The Electronic Thermal Relay (ETR) offers UL-approved single motor overload protection. The drive also supports the VLT PTC Thermistor Card MCB 112 for ATEX-certified motor protection in hazardous areas. Furthermore, sophisticated control capabilities like mechanical brake control and options for parallel connection of motors enhance versatility.

Frequently Asked Questions (FAQs)

Can't find the answer you need? Here are some frequently asked questions about the Danfoss FC-302 Variable Frequency Drive, and we answer them below.


What precautions should be taken before servicing the Danfoss FC-302 VFD?
Before any service or repair, stop the motor, disconnect all AC mains and DC-link power supplies, lock out PM motors, and wait for the specified discharge time (e.g., 30-40 minutes depending on voltage/power) for capacitors to fully discharge. Always verify zero voltage with a measuring device.

What is Automatic Motor Adaptation (AMA) and why is it important for the FC-302?
AMA is a function that optimizes dynamic motor performance by automatically measuring and optimizing advanced motor parameters (like stator/rotor resistance and reactances) at motor standstill. Performing an AMA ensures precise motor control and reduces thermal loading, crucial for efficiency and longevity.

What does a 'DC Overvoltage' alarm (ALARM 7) indicate and how can it be resolved?
A DC Overvoltage alarm occurs when the DC-link voltage exceeds a safe limit, often due to regenerative operation (e.g., fast deceleration). Solutions include connecting a brake resistor to dissipate excess energy, extending ramp-down times, or adjusting parameters related to the brake function.

How can I reset the Danfoss FC-302 VFD after an alarm trip?
You can reset the FC-302 after a trip by pressing [Reset] on the LCP, sending a digital reset input command, using a serial communication reset command, or if auto-restart is enabled (though caution is advised with auto-restart to prevent unintended starts).

What causes an 'Earth Fault' (ALARM 14) and how should I troubleshoot it?
An Earth Fault alarm indicates current leakage from the output phases to ground, either in the motor cable or the motor itself. To troubleshoot, remove power, then check for ground faults in the motor and cabling using a megohmmeter. Repair any damaged insulation or wiring.

Can I connect multiple motors to a single FC-302 VFD?
Yes, the FC-302 can control several parallel-connected motors, provided their total current consumption does not exceed the VFD's rated output current. However, Automatic Motor Adaptation (AMA) cannot be used in this configuration, and individual motor overload protection (e.g., thermistors) is required for each motor.

What is 'Safe Torque Off' (STO) on the FC-302?
STO is a safety function that prevents unintended motor start-up by safely removing torque-generating power from the motor. When activated, the motor coasts to a stop. To resume operation, 24 V DC must be applied to terminal 37, followed by a reset signal.[/faq;]
How do I change the motor rotation direction with the FC-302?
The direction of rotation can be changed either by physically switching two phases in the motor cable connections or by altering the setting of parameter 4-10 Motor Speed Direction through the LCP or programming interface.

What should be done if an 'Inverter Overload' (ALARM 9) occurs?
This alarm indicates the VFD has operated with more than 100% overload for too long. Check the output current against the VFD's rated current, and also compare it to the actual motor current. Reduce the load, extend ramp times, or consider a VFD with a higher power rating if overloading persists.

What is the role of the RFI switch (parameter 14-50) in the FC-302?
The RFI switch disables internal RFI filter capacitors between the chassis and DC link. It should be turned OFF when the VFD is supplied from an isolated mains source (IT mains) or TT/TN-S mains with a grounded leg, to prevent damage and reduce ground capacity currents. For optimal EMC performance, it is typically ON.

What happens if the 'Control Word Timeout' (WARNING/ALARM 17) occurs?
This indicates a loss of communication with the VFD via the serial communication interface. Troubleshoot by checking the communication cable connections, increasing the timeout time (parameter 8-03), verifying the operation of communication equipment, and ensuring EMC-compliant installation.

What are the maximum load limits for the 24V DC output on the control card?
The 24 V DC output on terminals 12 and 13 of the control card has a maximum load of 200 mA. If this limit is exceeded, it can lead to warnings (e.g., WARNING 47, 24 V supply low) or improper operation of connected devices.

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