FC-301P7K5T2E20H2XGXXXXSXXXXAXBXCXXXXDX Inverter VLT AutomationDrive 131H3659 FC301P7K5T2E20H2XGXXXXSXXXXAXBXCXXXXDX

131H3659 | Danfoss VLT FC301 HVAC Drive — 7.5kW / 10HP / 200–240V / 31A / CT / LCP102 Keypad / No DB Transistor

VLT FC 301 — Danfoss' HVAC-Dedicated Drive

The Danfoss VLT FC 301 (HVAC Drive) is engineered specifically for HVAC (Heating, Ventilation, and Air Conditioning) motor control applications — fans, pumps, compressors, cooling towers, and air handling units. Unlike general-purpose drives that adapt HVAC functions as optional features, the FC 301's design priorities are built around the HVAC application from the outset.

Key Specifications

FC 301 for HVAC — System Integration Features

The VLT FC 301 is designed to integrate with building management systems (BMS) and HVAC system controllers:

BMS communication: The FC 301 supports multiple fieldbus protocols through option modules — enabling direct connection to BACnet, PROFIBUS, and other BMS communication networks standard in commercial HVAC installations.

Cascade control: Multiple FC 301 drives can be configured in cascade pump or fan control schemes — automatically staging drives on and off based on system demand without an external PLC.

Sleep mode: The drive automatically reduces to a low-power state when the controlled system's demand falls below a minimum threshold — reducing energy consumption during low-load periods.

Application Scenarios

AHU fan drive at 240V: An air handling unit's supply fan requires 7.5kW variable speed drive on a 240V AC supply. The 131H3659 provides matched 240V input, CT rating for constant-torque fan operation, and LCP102 for commissioning and local parameter access.

Chiller pump drive: A commercial chilled water system pumps at constant torque characteristics requiring CT-rated variable speed control. The 131H3659 at 7.5kW CT serves this application without DB transistor complexity.

FAQ

Q1: Why is the FC 301 described as an "HVAC drive" rather than a general-purpose drive?

The FC 301 incorporates HVAC-specific features at the firmware and hardware level: built-in sleep mode, cascade control capability, fire mode operation (runs through faults in emergency), flying start for running fans, and pre-configured parameter sets for pump and fan applications. These functions require engineering effort to implement in a general-purpose drive; they are standard in the FC 301. The drive is also optimised for the energy efficiency profile of fan and pump loads.

Q2: What does the LCP102 display show during normal FC 301 operation?

During normal running, the LCP102 displays the configured monitoring parameters — typically output frequency, motor current, output power, and the drive's operating mode. The displayed parameters are configurable. During faults, the LCP102 shows the alarm code and plain-text alarm description, the fault history log, and the operating data at the time of the fault — significantly faster diagnostics than numeric-only displays.

Q3: Can parameters be copied between multiple FC 301 drives using the LCP102 on 131H3659?

Yes. The LCP102 on the FC 301 supports parameter upload (from drive to LCP102 memory) and download (from LCP102 memory to drive). When commissioning multiple identical drives, configure the first completely, upload the parameter set to the LCP102, then download to each subsequent drive — saving commissioning time in multi-drive HVAC installations.

Q4: What communication options can be added to 131H3659 for BMS integration?

The VLT FC 301 accepts communication option modules installed in the drive's option slots. Available options include: BACnet MS/TP (for building automation), PROFIBUS DP, DeviceNet, Modbus RTU, and Modbus TCP. The specific option required depends on the building management system's communication protocol. The base drive (131H3659) does not include a fieldbus option — the appropriate module must be added separately.

Q5: What overload capability does the CT-rated 131H3659 provide?

The CT (Constant Torque) rating allows the FC 301 to deliver 110% of rated current for 60 seconds and 160% for 30 seconds within a 10-minute cycle. This overload capability handles application start-up current demands and short-term torque surges without tripping — sufficient for the constant-torque fan and pump applications this drive is designed for. For applications requiring heavier overload (150% for 60 seconds), the drive should be specified at the next higher power rating.