Product Description:

The 134F8923 is a variable frequency drive manufactured by Danfoss for the VLT FC 103 Refrigeration Drives series. Intended for compressors, condensers, and evaporator fans, the drive converts fixed-frequency three-phase mains power into a regulated output that tracks process load. This operation allows chilled-water plants and cold-storage equipment to maintain precise temperatures while minimizing power consumption. Within an automation system, the drive provides closed-loop motor speed control and interfaces directly with refrigeration controllers and monitoring systems. Its variable-speed output lets connected equipment respond to changing cooling demand instead of operating continuously at full speed.

The inverter is rated for a continuous mechanical output of 5.5 kW, equivalent to 7.5 HP at the shaft, allowing motors and connected loads to be sized accordingly. It accepts a supply ranging from 380 to 480 VAC and connects to a three-phase distribution network, eliminating the need for step-up or single-phase conversion transformers. A built-in Class A2 RFI filter limits conducted emissions on the input side to meet industrial electromagnetic compatibility requirements. The available output supports medium-capacity refrigeration rack systems used in food-processing plants, refrigerated warehouses, and other facilities with variable cooling loads. Regulated motor control also reduces unnecessary cycling when demand changes during normal operation.

The chassis has an IP20 protection rating, so the drive must be installed inside a closed electrical panel. Local setup and operating access are provided through the Graphical Local Control Panel, which displays parameters, operating values, and fault codes without requiring an external computer. The unit has no brake chopper, so the system must manage regenerated energy without an integrated braking circuit during rapid deceleration. The drive uses an uncoated printed circuit board, making it suitable for climate-controlled electrical rooms where condensation and corrosive vapors are not expected. Standard cable entries simplify routing for mains, motor, and control wiring within the enclosure. The chassis format also permits installation alongside other panel-mounted control equipment while preserving access to the local display and electrical connections.