178B8451 by Danfoss

The 178B8451 is a decentralized variable-frequency micro drive produced by Danfoss and supplied within the FCD 300 Micro Drives series. Mounted close to the motor it controls, the unit converts fixed mains power into regulated output voltage and frequency so conveyor sections, mixers, and other field devices can run at commanded speeds without a cabinet-mounted drive. Placing the drive near the load can shorten motor cable runs, reduce the need for long cabinet wiring, and help keep distributed machine sections self-contained. By combining power electronics and network connectivity in a sealed housing, it supports localized speed control in processing lines where space inside control enclosures is limited.

The drive operates from a three-phase input of 3 x 380 to 480 V, matching typical industrial feeders, and it delivers a continuous mechanical output of 0.37 kW, which corresponds to 0.50 HP. These ratings suit small pumps, augers, and similar loads that require moderate torque with variable-speed control rather than fixed-speed operation. An enclosure rating of IP66 protects the electronics against dust ingress and high-pressure washdown, so the unit can be mounted near the driven machine in wet or dusty plant areas. Communication with higher-level PLCs is handled through Profibus DP V0/V1 at 3 Mbaud, permitting parameter access and diagnostic polling over a single twisted pair instead of separate hardwired control circuits.

The built-in integral 1A filter helps reduce conducted radio-frequency emissions without external components. Service access is provided through a wall-mount terminal box with metric threads and a service switch, allowing local isolation and straightforward cable entry during wiring. A display connector accepts remote keypads for local readouts or parameter copying, and support for a processing application preset helps simplify setup in batching or blending equipment. The electronics are supplied with standard hardware and a factory-applied protective coating that resists typical plant atmospheres and supports use in everyday industrial environments.