BQH24 Mine Intrinsically Safe Encoder / Mine Encoder
1. Use and scope of use
In the mine automation system can not be separated from the speed closed-loop control. Especially in mine hoists and dual-use belt conveyors that require high speed feedback, speed closed-loop control is used to enhance system operation reliability. For this reason, BQH24 mining intrinsically safe encoders are indispensable in closed-loop control or speed protection devices. The mine shaft encoder can be used together with the mine winch, belt conveyor electrical control device, and can also be used alone as a winch and belt conveyor speed measuring device and protection device.
2. Use environmental conditions
Environmental requirements
a) Ambient temperature: -5°C to 40°C;
b) average relative humidity: not more than 95% (+25°C);
c) Atmospheric pressure: 80kPa to 106kPa;
d) where there is no significant vibration and shock;
e) There are methane, coal dust and other explosive gas atmospheres under the coal mine, but there is no occasion to destroy the corrosive gas of insulation.
3 type of explosion-proof:
Explosion-proof type: Intrinsically safe, Sign: ExibI
4. Model specifications
5. Overall dimensions, weight and installation dimensions
a) Overall dimensions: φ102mm×153mm
b) Weight: 2.4 kg
c) Installation size: the center distance of the fixing screw is φ88mm
6. Outline drawing
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7. Technical data
a) Operating voltage: 12 to 24.5V
b) Operating Current: 100mA
c) Speed range: 0~600r/min
d) Output signal: 2 channels 0～2000Hz semiconductor contact type frequency signal output, when the conduction state output is not more than 0.5V (inject current 4mA), the leakage resistance is not less than 100kΩ when the output is off, and the duty cycle is 30%～70 %, the phase difference of 2 frequency signals is 60° to 120°.
e) Error: 5% (FS)
f) IP54 enclosure protection.
g) Pollution level 3
8. Structural characteristics and working principle
a) Encoder housing is manufactured from Ф75's garden steel. A transmission shaft is output on one side of the housing and is connected with the output shaft of the motor or other related rotating mechanisms. The center of gravity of the encoder installation coincides with no cracks, complete cables, and neat end points of the interface.
b) Another inlet of the housing is provided with an inlet nozzle for external connection.
c) The encoder is an optical encoder. There are four external lines, which are +24V, 0V, A, B, respectively. The encoder uses the principle of photoelectric conversion to output two groups of square-wave pulses A and B; A, B The two groups of pulses have a phase difference of 60°.
d) When the axis of the photoelectric encoder rotates, both A and B lines will generate pulse output. The two phases A and B will have a phase difference of 60 degrees, which can measure the rotation direction of the photoelectric encoder. If the A-phase pulse is ahead of the B-phase pulse, the photoelectric encoder is forward, otherwise it is reversed.
working principle
The photoelectric encoder consists of a grating disk and a photoelectric detection device. The grating plate is opened on a certain diameter of a circular plate and several rectangular holes are equally divided. Since the photoelectric encoder disk is coaxial with the motor, when the motor rotates, the grating disk and the motor rotate at the same speed, and a detection device composed of an electronic element such as a light emitting diode detects and outputs a plurality of pulse signals, and the number of output pulses of the photoelectric encoder per second is calculated. Can reflect the current motor speed.
9. Installation and wiring (see Table 1 for details )
Table 1
1. This product is used in circuits that pass the intrinsically safe test.
2. Its voltage and current do not exceed the voltage and current values on the nameplate.
3. The electrical parameters and specifications of the components related to the intrinsically safe circuit and the intrinsically safe circuit must not be changed during maintenance.
4. This product must not be connected to any associated equipment that has not been jointly tested.
5. After installing the encoder, turn the middle coupling and use a multimeter to check if the programmable display box is operating normally.
6. According to the model of the conveyor, the user should refer to the installation dimension of the shaft encoder and configure the installation foot or mounting plate. Ensure that the coaxial installation distance is adjusted.
11. Faults and troubleshooting (see Table 1)
Table 1 Failures and remedies
Line color
Terminal name
red
Power Supply (+Vcc:DC24)
black
Phase A
White
Phase B
blue
Power Supply (0V)
10. Installation and maintenance precautions
Symptom Cause Analysis Remedy Remarks
Pulse reception less than 1, whether the power supply has electricity 2, whether the signal line is connected to the wrong one, check the power supply 2 and reconnect the signal line
12. Packaging, Transportation and Storage
13.1 documents accompanying product packaging;
(1) packing list;
(2) product certification;
(3) Product instructions.
13.2 The system is allowed to be transported by any means of transportation that is rain-proof and sun-protected.
13.3 The encoder can be stored in a room with a temperature of -10°C to 40°C and a relative humidity of less than 90% without corrosive substances or strong vibration.
13. Ordering Information
14.1 The arrival of equipment must be unpacked and checked by full-time personnel.
14.2 After unpacking, check whether the number and model are correct according to the random packing list, and check whether the parts of the equipment are damaged, fallen off and other abnormal phenomena due to improper transportation.
14.3 Check whether the random document is defective, the product specification, the product certificate, and the special information that the user puts on order. If the data is missing or the device is damaged, contact the company promptly.
14.4 If the check is correct, signature acceptance. The company will use this as a basis to abandon the claims of the carrier, and the equipment will be supervised by the user.
14. Ordering and Services
15.1 In the ordering contract, the type, number of units, delivery date and form of the equipment, as well as the terms such as freight commitment and liability for breach of contract must be indicated.
15.2 When the user needs system debugging, he promises to arrive within 30 hours. The commissioning staff conducts technical training for users. The company provides one-year warranty service from the installation and use of the system.
15. Ordering Information
Specific detailed installation size, caller inquiries
BQH24 Mine Intrinsically Safe Encoder / Mine Encoder
