QJZ-400 Mining explosion-proof and intrinsic safety vacuum electromagnetic starterDetailed product description：

QJZ-200、400/1140（660）
Mining explosion-proof and intrinsic safety vacuum electromagnetic starter
Product User Manual

1. Scope of use
QJZ-200、 The 400/1140 (660) mining explosion-proof and intrinsic safety vacuum electromagnetic starter (hereinafter referred to as the starter) is suitable for use in mines containing explosive gases (methane) and coal dust.
2. Purpose
2.1 Mainly used for directly starting or stopping mining explosion-proof three-phase squirrel cage asynchronous electric motors with rated voltage of 1140V, 660V, frequency of 50Hz, and current up to 400A; Simultaneously protect the motor and control circuit. The starter should change direction during shutdown and have remote and program control functions.
2.2 The starter has a methane detection port, which can detect the methane concentration on the mining face when an external methane sensor is connected. When it exceeds the limit, the starter will be powered off. The starter has a current detection function and outputs a pulse frequency signal of 200-1000Hz. The communication interface RS485 can be selected according to user needs.

3. Model meaning
3.2 Specifications
3.2.1 Rated working voltage 1140660 V
3.2.2 Rated working current of 200 and 400 A
3.2.3 Rated control power supply voltage 36V
4. Applicable environment
4.1 Altitude not exceeding 2000m;
4.2 Surrounding environmental pressure of 80-110kPa;
4.3 The temperature of the surrounding medium shall not exceed 40 ℃ and shall not be lower than -5 ℃;
4.4 Relative humidity not exceeding 95% (25 ℃);
4.5 In an environment where there are no gases, vapors, or other liquids that can corrode metals or damage insulation, and where it is necessary to prevent water or other liquids from entering the interior of the starter;
4.6 In an environment without strong vibration and with a vertical installation inclination angle of no more than 15 ° from the horizontal plane;
4.7 Pollution level: Level 3;
4.8 Installation category: Class III

5. Explosion proof type
Mining explosion-proof and intrinsic safety type; Explosion proof mark: EXd [ib] Ⅰ
The starter is installed inside the explosion-proof shell, and the pilot circuit of its control part is designed to be inherently safe to achieve overall explosion-proof.

6. Main performance indicators

Model number	rated Voltage V	rated current A	When η× cos φ=0.75, the power of the squirrel cage motor can be controlled (kW)			Introduce the outer diameter of the cable （mm）		Weight kg
			1140V		660V	power line	Control circuit
QJZ-200、400/ 1140(660)	1140, 660	two hundred	60~290	35~170		φ32~ φ72	φ14.5~ φ21	three hundred
		four hundred	60~590	60~340

6.1 Ultimate breaking capacity: 4500A;
6.2 Mechanical lifespan: 1 million cycles; Electrical lifespan (AC4): 30000 cycles;
6.3 Isolation switch breaking capacity: 1200A;
6.4 Work System: Eight hour Work System and Intermittent Cycle Work System;
6.5 Methane detection range: 0% -4%; Methane sensor signal: 1-5mA;
6.6 Equipped with infrared remote control operation mode. All operations can be performed through an infrared remote control.
6.7 Outgoing ports: There are 4 main circuit outgoing ports, which can be used to thread through rubber sheathed cables with diameters of 32 to 71; There are 3 inlet and outlet ports for the control circuit, which can accommodate rubber sheathed cables with diameters ranging from 14.5 to 21;
6.8 Dimensions: 830 × 510 × 850

7. Structure Overview
The explosion-proof shell of the switch is square shaped and installed on a pry shaped base. The explosion-proof shell is divided into two explosion-proof chambers, the wiring chamber and the main chamber. The wiring chamber gathers all the input and output terminals of the main circuit and control circuit. There is a protective plate on the inlet end of the main circuit power supply. There are two main circuit inlet and outlet bell mouths on each side of the wiring chamber, and three inlet and outlet bell mouths on the front side. The main chamber is composed of a housing and a front door. The shell is equipped with electrical components such as isolation commutation switch, AC vacuum contactor, microcomputer comprehensive protector, display, current transformer, intrinsic safety plug-in, etc., which make up the starter. The front door and the housing are equipped with 4 fastening nails and 2 racks to ensure a proper fit clearance. After opening the door, the front door is supported on the shell hinge. There is a reliable mechanical lock between the front door and the housing. When opening the front door, the isolation switch must be turned to the stop position before the lock rod can be removed from the front door stopper. The other end should be inserted into the locking hole of the isolation switch to prevent further operation. At this time, the front door can be opened.