FC-101 Danfoss
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The Danfoss FC-101 is part of the VLT FC 101 HVAC Basic Drives series. It features two analog inputs with 10-bit resolution and four programmable digital inputs, and supports a maximum digital input voltage of 28 V DC. With an energy efficiency class of IE2 and a displacement power factor greater than 0.98, this drive also offers a vibration tolerance of 1.0 g.
Internal Product Review
The FC-101 is a Danfoss VLT HVAC drive with IE2 energy efficiency and a displacement power factor above 0.98. Two analog inputs and 10-bit analog input resolution support stable signal handling for HVAC control, making this drive a strong choice for efficient building automation.
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Product Description:
The FC-101 variable frequency drive is manufactured by Danfoss and belongs to the VLT FC 101 HVAC Basic Drives series within the VLT HVAC Drive product group. It converts fixed three-phase mains power into a controlled output that matches the operating demands of connected fans or pumps. This variable output allows building automation systems to regulate temperature, airflow, and pressure while reducing unnecessary motor energy consumption. The drive is suitable for common heating, ventilation, and air-conditioning systems that require proportional speed control instead of continuous full-speed motor operation.
Integration with controllers is handled through two analog inputs with a 10-bit resolution for setpoint signals. An internal 10 V supply can source 25 mA, and a separate 24 V terminal provides 80 mA for external transducers. Two programmable analog outputs support loads up to 500 Ω and maintain an accuracy of 0.4% of full scale for feedback signals. Four programmable digital inputs accept up to 28 V DC, and one channel operates as a high-speed counter rated at 32 kHz for flow or speed pulses. The available conversion levels suit proportional damper control and other applications that depend on gradual command changes. Accurate signal processing also helps limit loop error when the drive adjusts motor speed in response to process feedback.
The inverter maintains a displacement power factor above 0.98 and tolerates mains imbalance up to 3.0% without derating. This capability supports stable operation when the drive is connected to lightly loaded transformers or supply networks with minor phase variations. Motors may be wired with unshielded leads up to 50 m, simplifying retrofit wiring and allowing the drive to serve remotely mounted rooftop equipment. Compliance with efficiency class IE2 supports energy-saving requirements for HVAC equipment. The drive withstands vibration levels up to 1.0 g, allowing cabinet installation in rooftop plant areas or mobile equipment rooms where movement may occur. Its electrical characteristics provide flexible connections for control signals, transducers, motor wiring, and building automation interfaces without requiring unusually complex supporting hardware.
