Products Control Box

Explosion-Proof Variable Frequency Control Cabinet for Coal Mine

Material: carbon steel
Color: Gray
Place of Origin: Shanxi, China
Application: Industrial
Product Category: Control Box

This flame‑proof variable‑frequency control equipment is specially designed for flammable and explosive environments in underground coal mines. It is applicable to three‑phase AC systems of 380 V / 660 V / 1140 V, and performs variable‑frequency speed regulation and control for underground coal‑mine equipment such as belt conveyors, scraper conveyors, hoists and water pumps. Featuring explosion‑proof, dust‑proof, water‑proof and moisture‑resistant properties, the equipment complies with coal‑mine explosion‑proof safety standards. It integrates variable‑frequency speed regulation and intelligent control with multi‑level protection functions to realize soft start and smooth speed adjustment of motors, reduce equipment impact, and ensure safe and efficient underground coal‑mine production.

Rated Voltage: AC 380 V / 660 V / 1140 V (customizable)
Control Mode: Variable‑frequency speed regulation
Explosion‑proof Mark: Ex d I Mb
Protection Class: IP55
Applicable Power Range: 0.75 kW ~ 800 kW
Output Frequency: 0‑50 Hz (adjustable)
Communication Interface: RS485, Modbus protocol compatible
Compliance Standards: GB 3836.1, GB 3836.2, MT/T 1019
Protection Functions: Overload, phase loss, short‑circuit, electric leakage, motor over‑temperature, bearing temperature monitoring, power cut‑off upon gas over‑limit, and other multi‑protection features

① Mine‑specific flame‑proof design with Ex d I Mb explosion‑proof marking. Compliant with underground coal‑mine explosion‑proof safety standards, the unit can be directly deployed in flammable and explosive underground coal‑mine environments with high safety performance.
② Wide‑voltage design supports common coal‑mine voltage grades of AC 380 V, 660 V and 1140 V to meet power‑supply requirements of diverse underground equipment.
③ Intelligent variable‑frequency control enables soft motor start‑up and smooth speed adjustment. It lowers inrush current and mechanical shock during start‑up to extend service life, and adjusts rotating speed according to load conditions for energy‑saving operation.
④ Comprehensive mine‑oriented protection functions including power cut‑off for excessive gas concentration, motor temperature monitoring, bearing temperature monitoring and leakage lock‑out safeguard underground production safety.
⑤ Dust‑proof and moisture‑resistant sealed construction ensures stable and reliable operation under harsh underground conditions featuring high humidity and heavy dust.

Variable‑frequency control for underground coal‑mine belt conveyors; speed regulation for scraper conveyors; variable‑frequency control for underground hoists and drainage pumps; speed adjustment for underground fans; motor variable‑frequency control for coal‑preparation‑plant equipment on coal‑mine surfaces; and other motor speed‑regulation applications for flammable‑explosive environments both underground and on the surface of coal mines.

Q1: What is the explosion‑proof rating of this coal‑mine explosion‑proof VFD control cabinet?

A: This product carries the explosion‑proof mark Ex d I Mb as a flame‑proof device. It meets safety standards for underground coal mines and can be used directly in underground sites with gas and coal‑dust explosion hazards.

Q2: What underground coal‑mine voltage grades are supported?

A: The standard model covers three widely‑used coal‑mine voltages: AC 380 V, 660 V and 1140 V. Other voltage specifications are available upon custom request.

Q3: Does it support protection against excessive gas concentration?

A: It is equipped with a standard interface for power cut‑off triggered by excessive gas concentration. An external gas sensor can be connected. When underground gas concentration exceeds the threshold, the equipment power supply will be automatically disconnected to guarantee underground operational safety.