# Variable Frequency Control Cabinet

## Product Features

The enclosure is die-cast from high-pressure aluminum alloy, with surface shot blasting followed by high-voltage electrostatic powder coating.
This series adopts a composite structure: the main chamber is flameproof type, and the terminal chamber is increased safety type.
Modular design allows free combination of each circuit.
High breaking capacity miniature circuit breakers or moulded case circuit breakers are installed inside. Circuit closing and tripping can be realized via the handle on the enclosure cover.
Equipped with status indicator lights.
It provides overload and short-circuit protection. Units with earth leakage protection can be manufactured upon customer request.
It can be used for power distribution and circuit switching of lighting circuits or power circuits, and also supports mixed use for both lighting and power distribution/switching.
Custom fabrication is available according to user requirements.
Suitable for steel conduit or cable wiring.

## Product Overview

The variable frequency control cabinet is mainly used to adjust the operating frequency of equipment, reduce energy consumption, start equipment smoothly and mitigate damage to motors caused by heavy inrush current during direct startup. Meanwhile, it is equipped with analog input (for speed control or feedback signals), PID control, pump switchover control (for constant pressure), communication functions, macro functions (parameter settings for different working conditions), multi-speed operation and more. It is widely applied in automatic control for water supply, drainage, fire protection, sprinkler pipe network pressurization, as well as hot and cold water circulation for HVAC systems in industrial, agricultural and various building scenarios.

## Control Types

1. Liquid Level Control: The control cabinet is fitted with high-performance KEY float switches. It automatically starts and stops water supply & drainage pumps according to high and low liquid level changes.
2. Pressure Control: Connected with external electric contact pressure gauges or pressure controllers, it can start and stop pumps automatically with changes in pipe network pressure. This type is widely used in domestic water supply and fire pressurization systems.
3. Temperature Control: Connected with external temperature controllers, it starts or stops pumps within the preset temperature range, applied in constant temperature, heat exchange systems and other temperature-controlled occasions.
4. Time Control: Time setting buttons and a display are mounted on the cabinet panel. Users can control pump startup and shutdown as required by timing, suitable for control of periodic or regular intermittent operation modes.

## Operating Conditions

1. Power Supply: Mains power, self-owned power grid, diesel generator sets; 3-phase AC 380V, (-10%, +15%), 50Hz
2. Applicable Motor: General squirrel-cage asynchronous motor
3. Starting Frequency: Supports frequent startup; recommended no more than 20 times per hour
4. Protection Class: IP41 or IP20