Mine flameproof electromagnetic starter Qjz-200/1140.660s

The design and manufacturing of the explosion-proof structure of this series of products comply with standard requirements and comply with coal industry standards and enterprise standards/.
1. Overview
This starter uses a full Chinese display and has protection functions such as undervoltage, short circuit, overload, phase failure, three-phase unbalance, leakage lockout, wind power lockout, etc. It can easily realize remote control/near control, single/ The conversion operation of the joint unit also has fault memory and time functions. There is a methane detection interface. When an external methane sensor is connected, the methane concentration in the mining working surface can be detected. When it exceeds the limit, the starter is powered off and the starter has current detection. Function, output pulse frequency signal~
. The communication interface can be selected according to user needs.
2. Normal working conditions
The altitude does not exceed meters
The upper limit of the ambient air temperature is +℃ and the lower limit is ℃
The relative humidity of the surrounding air is not greater than (when +℃)
/>In a place where there is no severe vibration, bumps, and the installation inclination with the horizontal plane does not exceed br/>Pollution level
Installation category.
3. Main technical performance indicators
Model

Rated voltage


Rated
Current


At that time, it was possible to control
the power of the squirrel cage motor

the outer diameter of the incoming cable


the quality








Power lines

Control lines

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Intrinsically safe output maximum open circuit voltage
Intrinsically safe output maximum short circuit current
Ultimate breaking capacity
Mechanical life of 10,000 times Electrical life of 10,000 times
Breaking capacity of the isolation switch
Eight-hour working system and intermittent cycle working system
Methane detection range~
Methane sensor signal~
Outlet main circuit inlet and outlet line There are two openings for the inlet and outlet of the rubber sheathed cable control circuit, which can be inserted into the ~
Rubber sheathed cables
Outline dimensions
4. Structure overview
The flameproof housing of the switch is square and mounted on a skid-shaped base. The explosion-proof shell is divided into two explosion-proof chambers, the wiring chamber and the main chamber. The wiring cavity contains all the incoming and outgoing terminals of the main circuit and control circuit. The main circuit power supply incoming end is covered with a protective plate. There are two main circuit inlet and outlet horns on each side of the wiring cavity, and three control circuit inlet and outlet horns on the front side. The main cavity is composed of the shell and the front door. The housing is equipped with electrical components that make up the starter, such as an isolation reversing switch, AC vacuum contactor, microcomputer integrated protector, display, current transformer, intrinsically safe plug-in, etc. There is a reliable mechanical lock between the front door and the casing. When opening the front door, the isolation reversing switch must be moved to the stop position before the locking lever can be withdrawn from the front door stop and the other end is inserted into the locking hole of the isolation reversing switch. So that it can no longer be operated, then the front door can be opened.
5. Working Principle
The electrical principle of the starter is shown in the attached figure
The starter uses a microprocessor to complete the collection and calculation of control signals to realize various protection functions and the on-off of the starter. control.
Single unit
The starter has the function of close control or remote control. This function can be realized by flipping the near and remote control toggle switches on the front door core panel. Normally, the secondary side winding of the power transformer provides working power for the pilot. At this time, when the start button (proximity control) is pressed, the AC passes through the pilot's internal transformer and becomes DC after half-wave rectification by the diode, causing the pilot relay to be energized and closed. , the intermediate relay is energized and closed, the AC vacuum contactor is energized, and the main circuit is connected. If the diode connected in the pilot circuit is short-circuited, the pilot relay will refuse to move because there is no DC working power supply.
Joint unit
The first protector can be set to single unit/remote control or near control, and the second unit is set to joint unit/remote control. The local unit has a delay of ~ and the feedback delay~ , the first station is set to joint station/remote control, local unit delay~, feedback delay~, the last station is short-circuited.
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