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FC-102 Danfoss

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The Danfoss FC-102 is part of the VLT FC 102 HVAC Drives series and features two analog inputs and one analog output with resolutions of 10-bit and 12-bit respectively. It includes four dedicated digital inputs, two configurable digital I/O, and operates with a scan interval of 1 millisecond. The drive allows a maximum shielded motor cable length of 150 meters and can function at a maximum ambient temperature of 50°C.

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Product Description:

The FC-102 is a variable frequency drive produced by Danfoss within the VLT FC 102 HVAC Drives series. In building automation, the unit modulates three-phase motor speed so air-handling units, pumps, and chillers match real-time load demand, lowering energy use while keeping airflow and pressure within design limits. A scan interval of 1 ms supports the internal PLC function so control logic executes quickly.

The controller provides two analog input channels with 10-bit resolution for sensors such as temperature or differential pressure and one analog output with 12-bit resolution for feedback to supervisory systems. Two configurable digital I/O points and four dedicated digital inputs let the drive react to interlocks or occupancy signals, while the digital output stage sources up to 40 mA and two form-C relay outputs switch external contactors. Pulse feedback devices, including airflow pickup wheels, are accepted at frequencies up to 110 kHz. Motor wiring can be run in shielded conduit for distances up to 150 m without violating EMC limits. The Series Identifier 102 indicates compatibility across the VLT HVAC Drive product group.

The drive remains at full current in ambient temperatures up to 50 °C and maintains its rating at elevations up to 1000 m without derating, supporting installation in rooftop mechanical rooms or high-rise penthouses. It withstands sinusoidal vibration levels of 1.0 g, protecting the electronics when mounted on fan decks or pump skids. The control circuitry supplies field devices with a 10 V reference capable of delivering 15 mA and a 24 V terminal capable of delivering 200 mA, eliminating separate power supplies for most transmitters and switches. Shield continuity clamps and ground screws are included to support the allowable shield length while maintaining low-noise analog measurements.

10 V Output Max Load
15 mA
24 V Output Max Load
200 mA
Analog Input Resolution
10 bit
Analog Inputs
2
Analog Output Resolution
12 bit
Analog Outputs
1
Configurable Digital I/o
2
Dedicated Digital Inputs
4
Digital Output Max Current
40 mA
Max Altitude No Derating
1000 m
Max Ambient Temperature
50 °C
Max Shielded Motor Cable
150 m
Product Group
VLT HVAC Drive
Pulse Input Max Frequency
110 kHz
Relay Outputs
2
Scan Interval
1 ms
Series Identifier
102
Vibration Test
1.0 g

Frequently Asked Questions about FC-102:

Q: How many analog inputs are available on the FC-102 drive?

A: The FC-102 offers two analog inputs with a resolution of 10 bits each.

Q: What is the maximum installation altitude for the FC-102 without derating?

A: This drive can operate up to a maximum altitude of 1000 meters without derating its performance.

Q: What is the maximum shielded motor cable length allowed for the FC-102 drive?

A: The FC-102 supports a maximum shielded motor cable length of 150 meters.

Q: How many relay outputs are included on the Danfoss FC-102?

A: There are two relay outputs provided on the FC-102 model.

Q: What is the scan interval of the Danfoss FC-102 HVAC drive?

A: The FC-102 has a scan interval of 1 millisecond, enabling fast input processing.


Internal Product Review

  • ‘‘The FC-102 is a Danfoss VLT HVAC drive with a 1 ms scan interval and 110 kHz pulse input capability. Support for 2 analog inputs with 10-bit resolution gives HVAC control loops clean and responsive signal handling. A 50 °C maximum ambient temperature rating makes this drive a strong choice for dependable panel operation.’’

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