Electromagnetic Starter
The Mining Explosion-proof and Intrinsically-safe Vacuum Electromagnetic Starter is mainly used in the mines with explosive dangerous gas and coal dust, and is applied for starting, stopping and reversing at stop of the three-phase squirrel-cage asynchronous motor with AC 50Hz, voltage up to 1140V (660V), current up to 400A and below and of long-term or interrupted working system.
1 For main Technical Parameters, see Table 1.
Table 1
Model
Rated Operating Voltage V
Rated Operating Current A
Rated Frequency of the Power Supply Hz
Working System
QJZ-400/1140 (660)
1140 (660)
400
50
Long-term
2 Technical Performance:
2.1 The Starter Insulation can withstand AC 50Hz, and there is no breakdown or flashover at the test voltage (effective value) specified in Table 2 for 1 min
Table 2
Rated Insulation Voltage Ui
Test Voltage V
≤60V
1000
1140（660）V
4200
2.2 For Connecting and Make-break Capability of the Main Circuit, see Table 3
Table 3
Use
Category
Rated Operating
Current (A)
Connecting Connection
Make-break Condition
Power on
Time (S)
Interval
Time (S)
Operation Cycle Frequency
I/Ie
U/Ue
cosφ
I/Ie
U/Ue
cosφ
AC-3
400
8
1.1
0.35
6
1.1
0.35
0.05
240
50
AC-4
400
10
1.1
0.35
8
1.1
0.35
0.05
240
50
AC-3: used for break at start and during operation of the cage-type Synchronous Motor
AC-4: used for start, reverse operation and jog of the cage-type Induction Motor
2.3 For Overload Protection, see Table 4
Table 4
Actual Current / Setting Current
Action Time t
Resetting Mode
Initial State
Resetting Time t
1.05
No action for a long term
--
Cold condition
--
1.2
5min<t<20min
Automatic
Hot condition
1min<t<3min
1.5
1min<t<3min
Automatic
Hot condition
6
8S≤t≤16S
Automatic
Cold condition
2.4 See Table 5 for Short Circuit Protection
Table 5
Actual Current / Setting Current
Action Time
Resetting Mode
8 to 10 times
0.2S<t<0.4S
Manual
2.5 See Table 6 for the Phase Failure and Unbalance Protection
Table 6
Overcurrent / Setting Current
Action Time
Initial State
Any two phases
Third phase
1.0
0.9
No action
Cold condition
1.05
0
<3min
Hot condition
2.6 See Table 7 for the Electric Leakage Locking Function
Table 7
Operating Voltage of the Main Circuit (V)
Locking Action Value (KΩ)
Unlocking Action Value (KΩ)
Allowable Error
660
22
≥1.5 times of locking value
+20%
1140
40
The Starter has installed a translational quick door opening structure and the Starter itself has a push-pull structure and a built-in guide rail. In this way, the starter can be easily taken out and the control element, which is independently installed on a panel, can be quickly replaced. The ZKJB-K1 Chinese intelligent integrated protector is used as the control unit in the core protection part. It has the functions of electric leakage locking, overload protection, short circuit protection, phase loss protection, under-voltage protection, overvoltage protection, program control protection, etc.
The full Chinese LCD display is adopted for the starter, which can display multiple parameters of the starter, such as the starter setting parameters, insulation resistance value, operating current value, operating voltage value, work and fault type, failure parameters, etc. The biggest advantage is that the current value is continuously adjustable between 0-400 (315, 200)A. It can be accurate up to Ampere level, and the resolution is 1A. In case of overcurrent, short circuit, electric leakage locking, under-voltage, phase loss program control failure, etc, it can automatically cut off power supply circuit, and display and memorize the failure type and failure parameters. Meanwhile, the starter is locked, and the related failure text information is provided. It can only be re-switched on after troubleshooting and manual resetting.
1 Structural Features
The starter consists of two parts, which are an explosion-proof housing and a vacuum body, and the vacuum body is in the explosion-proof housing.
(1)The starter consists of a rectangular explosion-proof housing on the base. There is a wiring chamber in the upper part of the housing and the main chamber is in the lower part of the housing. These are independent explosion-proof parts. The starter has the quick-open structure, and the front door is the plane rabbet type. There is a rotation handle at the front left side. It can be horizontally rotated by about 90°. Rotate it to the right side to open the door while to the left side to close the door. The interlocking lever is arranged at the front right, and there are two buttons at the right: start and stop; there is also a handle which isolates the commutation switch, there are two gears in total: power on and power off. Rotate the handle to the stop position, and rotate the interlocking lever to the locating slot to open the door. There is a window in the upper part of the door cover, and there are three buttons (confirm, up and down) below it to set the switch.
(2) All elements of the vacuum body are installed on the bottom plate, and the front is installed with the vacuum contactor, motor integrated protector, remote and proximity switch, intermediate relay and fuse, so as to facilitate inspection, adjustment and repair. The back is installed with the conversion isolating switch, control transformer and start-stop button.
2 Working Principle
2.1 Connect the HGK commutation switch to control transformer’s secondary output voltage. The normally open contact of the relay in the protector is closed, so as to be ready for power supply.
2.2 Press the start button QA, and the intermediate relay ZJ coil is powered. The normally open contact is closed, and the coil of the vacuum contactor is powered on, so that the main contact is engaged for start.
2.3 Press the stop button TA, the intermediate relay ZJ is powered off, the normally open contact is disconnected, and the vacuum contactor coil is powered off, so that the main contact is separated to stop the motor.
2.4 In case of overload, short circuit, phase failure and other failures of the motor during operation, the normally open contact of the relay in the protector is disconnected, the intermediate relay ZJ is powered off, and CKJ coil is powered off and tripped, so as to play the role in protection.
2.5 Before the starter is on, the electric leakage detection circuit of the protector will conduct leakage detection of the load through the locking cable and ZJ and CKJ normally closed contacts. When the grounding insulation resistance of the main circuit is lower than the specified value, it is locked. (1140V, the phase-to-ground insulation resistance is 40+20%KΩ; 660V, the phase-to-ground insulation resistance is 20+20%KΩ).
2.6 The Starter itself is arranged with the remote/close control switch. For example, if long-distance control is required, set the remote/close control switch to remote control, it will automatically start, and the buttons will not work. set the switch to close control for close control.
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Explosion-proof Model: Mining Explosion-proof and Intrinsically-safe Type
Explosion-proof Symbol: Exd[ib]I Mb1.The elevation height shall not exceed 2000m;
2. The ambient temperature shall be -5～+40℃ (23°F to 104°F);
3. The surrounding relative humidity should not exceed 95% (25°C/77°F);
4. Mines with a mixture of methane and coal dust;
5. Places without strong vibrations and impacts;
6. The installation inclination from the vertical plane shall not exceed 15°;
7. Places without gas or steam sufficient to damage the metal or equipment insulation;
8. Places without water dripping or water immersion;
9. The installation inclination from the horizontal plane shall not exceed 15o;
10. Places where rain, snow, and drips can be prevented;
11. Installation Category: Class III;
12. Pollution Class: Class 3.
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