178B5027 by Danfoss

The 178B5027 is an AC variable frequency drive from Danfoss that belongs to the VLT 2800 Low Voltage Drives series. This unit is installed between the mains supply and a three-phase induction motor in plant automation systems. It adjusts motor speed to match process demands, allowing controlled operation in applications that need variable motor output rather than fixed-speed running.

The drive delivers a continuous mechanical output of 1.5 kW, which corresponds to 2.0 HP at the motor shaft. It accepts a supply of 380-480 V at 50/60 Hz on a three-phase network, and the ±10% tolerance allows operation on utility lines that fluctuate within typical industrial limits. Protection is rated at IP20, so the electronics are guarded against fingers or similar objects once the unit is mounted inside a cabinet. Thermal losses are managed by the standard hardware configuration without auxiliary coolers. No application option is installed, and the process-oriented parameter set can be adjusted locally through the integrated interface.

The enclosure follows the Bookstyle format, so multiple units can be mounted side by side to reduce panel width. Parameter access is provided by the built-in display (SLCP), enabling on-site monitoring without an external keypad. All power boards have a protective coating, and this layer helps protect conductive traces from airborne contaminants found in process environments. Radio-frequency suppression is omitted, noted as without EMC filtering, so external RFI measures must be added where emission limits apply. The unit has no fieldbus option, so serial or Ethernet adapters are not fitted, although the available digital and analog I/O still support basic signaling with a PLC. A dedicated application tag of Process indicates default PID and ramp settings for flow, pressure, and similar closed-loop duties.