178B8593 by Danfoss

The 178B8593 is an AC variable-frequency drive produced by Danfoss for the VLT 2800 Low Voltage Drives series. It is intended for process-oriented automation, where pump, fan, or conveyor motors must follow changing load conditions instead of running at a fixed synchronous speed. By rectifying and inverting the incoming supply, the drive delivers a variable output frequency that lets a three-phase induction motor accelerate, decelerate, or hold a constant setpoint as commanded by a PLC or its local keypad.

The inverter's power section is rated at 1.5 kW, providing continuous electrical output that corresponds to 2.0 HP at the motor shaft. It accommodates a supply window of 200-240 V AC, so it can be wired directly to common low-voltage busbars without an isolation transformer. The housing follows a bookstyle format, meaning the heat sink and control card share a narrow front profile that saves cabinet width and promotes vertical airflow between adjacent units. Parameter access is handled by a built-in display (SLCP), so operators can view status words, fault codes, and process references without attaching an external keypad. Fieldbus connectivity is omitted, leaving the internal terminal strip to accept conventional analog and digital I/O for start, stop, and setpoint control.

Environmental protection is classified as IP20, so the drive requires installation in a clean, enclosed panel but does not need additional gasketing once mounted. The power PCB is produced with a coating to resist airborne moisture and conductive dust that may enter during maintenance. Mechanical energy dissipation during rapid deceleration is aided by a factory-installed brake chopper in the standard brake configuration. For installations where electromagnetic compliance is required, an external line filter must be added because the unit ships without an EMC filter. This arrangement suits indoor industrial sites that favor compact equipment and straightforward wiring.