Product Description:

The 131B7817 variable frequency drive is manufactured by Danfoss and belongs to the VLT FC 102 HVAC Drives series. It is designed for fan, pump, and compressor duty, where it adjusts induction motor speed to match airflow or pressure setpoints in building automation systems. The unit is intended for normal cabinet mounting on frames A, B, or C, allowing the power section to be installed close to other control hardware while keeping terminal access clear. This arrangement suits indoor control cabinets that require compact placement and direct access to power and control connections.

The power section accepts 380 – 480 VAC on three-phase power, so it can be connected directly to industrial mains without a separate transformer. A factory-installed MCB-105 Relay Card provides form C contacts for alarm or status signaling, which reduces the need for separate interface relays in the cabinet. The IP20 chassis construction allows finger-safe access but does not provide water protection, so the drive is intended for enclosed indoor mounting. Cable routing uses standard cable entries, and the default gland plate remains in place when no special adaptation is selected. The unit does not include a brake chopper, so braking energy must be managed by the motor system or an external resistor when the application requires it.

User interaction is handled through a front-mounted graphical local control panel that displays real-time HVAC operating data and supports local setup and monitoring. The control board uses an uncoated PCB, so the enclosure should remain free of corrosive vapors and airborne contaminants. EMC performance is supported by an integrated RFI filter, which helps reduce conducted interference on the supply lines. The series designation is 102, identifying this model within the FC 102 HVAC range. The front display also allows operating values and status messages to be viewed without opening the cabinet.