LK4 series master controllerDetailed product description：

purpose
1. The LK4 series master controller is suitable for circuits with AC 50HZ voltage up to 380 volts and DC voltage up to 220 volts, and is a control component in automated transmission devices. The master controller can be directly or indirectly connected to the operating machinery through a reducer, and the contacts of the master controller can be closed or opened in a certain order according to the stroke or angle of the operating mechanism. (It can also be driven by an auxiliary motor).
1.1. The basic components of the master controller include cam assembly and contact assembly. The cam assembly is composed of a shaft and a disc. The cam plate is composed of two identical semi-circular blocks, each with ten holes and one circular groove, with a spacing of 18 ° between the two holes. There are slots on the cam plate that can be adjusted by 10 ° 30 'to the left and right of the fixed bolt, so the position of the contact controlled by the cam for opening and closing can also be adjusted accordingly. Due to the limitations of the arc breaking ability of the main controller contacts and the wear resistance of the mechanism, the rotational speed of the cam plate shall not exceed 60 revolutions per minute.
1.2. Each cam plate acts on a circuit, and the number of cam plates is equivalent to the number of circuits in the controller. When the master controller has a large number of circuits, there are two sets of cam assemblies, the moving contact assembly and the stationary contact assembly. At the same time, according to the needs, the cam assembly of the master controller can rotate in parallel, that is, two sets of cam assemblies can rotate simultaneously, or they can rotate in series, that is, the first set of cam assemblies and the second set of cam assemblies rotate sequentially.
1.3. According to the shell device of LK4 series master controller, it can be divided into
1.3.1 Protective master controller LK4-0LK-1
1.3.2 Waterproof master controller LK4-6
1.4. According to whether the LK4 series master controller decelerates, it can be divided into two types:
1.4.1. LK4-024LK4-044LK4-055 is a master controller without deceleration.
1.4.2. Except for the LK4 master controller listed in 1.4.1, all other LK4 master controllers are equipped with reducers
1.5. The LK4-148/3LK4-148/4LK4-168/3LK4-168/4LK4-188/4 master controller has two sets of cam assemblies, which are connected to the operating mechanism through a reducer. Deceleration can make the two sets of cam assemblies rotate in parallel or in series.
1.6.LK4-658 type master controller is waterproof and equipped with a set of cam assemblies, which are connected to the transmission shaft through a worm gear reducer mounted on the master controller housing. The contact series of this master controller is slightly different from other master controllers. Two of its five circuits can be equipped with arc extinguishing devices. Therefore, the static contact head on top is covered with an arc cover, and the arc extinguishing coil establishes a magnetic field to generate a magnetic blowing effect and achieve the arc extinguishing effect.
Technical data
2.1 The model, number of circuits, placement method, and reduction ratio of the main controller are shown in Tables 1 and 2

model	Total number of circuits	Number of cam discs on each axis	Cam assembly rotation method	Gearbox transmission ratio
LK4-024	two	two		——
LK4-044	four	four		——
LK4-054	six	six		——
LK4-028-1	two	two		1：30
LK4-028-2	two	two		1：5
LK4-048-1	four	four		1：30
LK4-048-2	four	four		1：5
LK4-058-1	six	six		1：30
LK4-058-2	six	six		1：5
LK4-148/3	eight	four	series connection	1：16.65
LK4-148/4	eight	four	parallel connection	1: 1:20 or 1:36
LK4-168/3	sixteen	eight	series connection	1：16.65
LK4-168/4	sixteen	eight	parallel connection	1: 1:20 or 1:36
LK4-188/3	twenty-four	twelve	series connection	1：16.65
LK4-188/4	twenty-four	twelve	parallel connection	1: 1:20 or 1:36

model	Number of circuits		Gearbox transmission ratio
	No arc extinguishing device	There is an arc extinguishing device
LK4-658-1	five	0	1：1
LK4-658-4	three	two	1：30
LK4-658-5	five	0	1：30
LK4-658-6	five	0	1：5
LK4-658-7	three	two	1：5

2.2 The load and limit conversion capacity of the main controller contacts are shown in Table 3, Table 3

Current category	Rated voltage (volts)	Rated heating current (A)	Connection capability	breaking capacity	Power number COS Ø+0.05	Time constant 7 (seconds) ± 15%	number of trials
communication	three hundred and eighty	ten	one hundred	ten	zero point four		fifty
direct current	two hundred and twenty one hundred and ten	ten	seventy-five	one point five two		zero point zero one	twenty

The operating frequency of the main controller is 1200 revolutions per hour, but the number of connections per minute shall not exceed 60 times
2.4 The main controller can withstand 200000 connections and 200000 disconnections for AC and 100000 connections and disconnections for DC at 1200 revolutions per hour (with a connection time of 0.2~0.5 seconds) After the experiment, the main controller contacts can still continue to work
The 2.5 master controller can withstand 1 million closing and opening cycles when no current passes through, and its contacts and springs can withstand 300000 closing and opening cycles Can continue to be used after the experiment

Principle of Action
3.1 When the contact is disconnected, the cam plate 3 on shaft 1 rotates clockwise.
3.2 Close cam 2 and move it to roller 9, press it onto it, and twist the contact to support 8-contact bridge 6, which spans over static contacts 4 and 5, connecting the circuit. The fixed lock buckle 12 is pressed against the notch of the contact support 8 by the action of the spring 13, so that 3 is fixed in the closed position.
3.3 The cam disc 3 continues to rotate.
3.4 Disconnect the cam 7 and press the roller 11 onto it to rotate the fixed locking buckle 12, thus releasing the contact support 8. The latter rapidly rotates around its axis due to the action of the spring 10, causing the circuit to disconnect.
Usage environment
4.1. The LK4 master controller is suitable for the following working conditions:
4.1.1 The altitude shall not exceed 1000 meters;
4.1.2 The ambient air temperature should not exceed+40 ℃ and should not be lower than -25 ℃ (when the temperature is lower than -15 ℃, non freezing lubricating oil should be used, and when the temperature is lower than -25 ℃ to -40 ℃, it should be specified when ordering).
4.1.3 The relative humidity of the air shall not exceed 80%;
4.1.4 In a medium without explosive hazards, and without gases and dust (including conductive dust) that can corrode metals and damage insulation;
4.1.5 Places without significant shaking and impact vibration.

Appearance and installation dimensions of LK4 series master controller

model	Size (millimeters) LA		Keyway size (mm) width x length	Number of installation holes - diameter	Shaft diameter in millimeters
LK4-024	two hundred and fifty-five	eighty	6×35	4-Ф14	Ф17
LK4-044	three hundred and fifty-seven	one hundred and eighty-two	6×35	4-Ф14	Ф17
LK4-054	four hundred and fifty-nine	two hundred and eighty-four	6×35	4-Ф14	Ф17

model	Size (mm) LA		Shaft diameter in millimeters	Keyway size (mm) width x length	Number of installation holes - diameter
LK4-028	two hundred and fifty-five	eighty	Ф17	6×36	4-Ф14
LK4-048	three hundred and fifty-seven	one hundred and eighty-two	Ф17	6×36	4-Ф14
LK4-058	four hundred and fifty-nine	two hundred and eighty-four	Ф17	6×36	4-Ф14

model	Shaft diameter in millimeters	Keyway size (mm) width x length	Number of installation holes - diameter	L millimeters	A millimeter	L1 millimeters
LK4-148	Ф18	6×35	4-Ф17	five hundred and fifty-five	one hundred and five	117．5
LK4-168	Ф18	6×35	4-Ф17	eight hundred and thirty-seven	three hundred and forty-three	139．5
LK4-188	Ф18	6×35	4-Ф17	one thousand and forty-two	five hundred and twenty	147．5

model	Shaft diameter	Keyway size	remark
LK4-658 various types	Ф17	6×25

Maintenance and storage of LK4 series master controller

6.1 If poor contact or burns are found during the use of the controller, the dynamic and static contacts can be replaced.
6.2 Regularly add lubricating oil to the rotating parts of the controller.
6.3 During transportation and storage, the controller shall not be affected by rain or snow, and shall be stored in a well ventilated warehouse with a relative humidity of no more than 80% (equivalent to+20 ℃± 5 ℃) and a temperature not higher than+40 ℃ and not lower than -25 ℃.
Ordering Instructions

7.1 When there is no order, it must be indicated
7.1.1 Model and name of the main controller; The speed ratio of the gearbox for LK4-148/LK4-168/4LK4-188/4 models still needs to be explained;
7.1.2 General or Damp Heat Type.