I. Installation Steps
1. Selecting an Installation Location
Fix the sensor onto the channel steel of the conveyor frame, ensuring the roller is flush against the underside of the upper belt and rotates synchronously with the belt. The installation point should avoid areas with severe vibration, water spray, or strong magnetic field interference.
2. Mechanical Fixing
Use brackets and adjusting bolts to securely fasten the sensor to prevent loosening during operation. The roller axis must be perpendicular to the belt's direction of movement to avoid sliding friction affecting speed measurement accuracy.
3. Electrical Wiring
Connect the cable according to the wiring markings:
E (Power +) → Intrinsically safe power positive terminal
V (Speed signal) → Main unit signal input terminal
O (Power ground) → Power negative terminal
The cable should be a rubber-sheathed flexible cable with mining safety certification, generally not exceeding 1000 meters in length.
4. Explosion-proof and Protection
Ensure all wiring ports are intrinsically safe (ExibI) and well-sealed to prevent methane gas or dust from entering the circuit system.
II. Debugging Method
1. Setting the Rated Speed Gear: Open the top cover of the speed detection converter. Select the corresponding speed gear switch according to the actual belt linear speed (e.g., 1.5m/s, 2.5m/s, 3.5m/s), setting it to be close to the actual value.
2. Functional Testing
Low Speed/Overspeed Response Test: When the simulated belt speed is 50% lower than the set value or 110% higher, the sensor should immediately output a low level. When the speed remains between 50% and 70% for 10 seconds, a low level output should also be triggered (inverse time protection).
Self-Test Function Verification: Press the self-test button on the casing. The fault indicator light should illuminate, confirming that the alarm circuit is normal.
3. Signal Output Calibration: Connect an ammeter in series at the constant current output terminal and adjust potentiometer W2 to make the output 5±0.5mA, ensuring stable signal transmission.
4. Operational Verification: Start and stop the equipment multiple times to observe whether the sensor accurately responds to speed changes and correctly flips the level signal. After confirming that everything is correct, tighten the fixing device and mark it.
III. Precautions:
1. Installation and debugging must be done with the power off. Operate only after power is on to ensure safety.
2. It is strictly forbidden to arbitrarily change the intrinsically safe circuit parameters or replace non-compatible equipment, otherwise the explosion-proof performance may be lost.
3. During maintenance, focus on checking whether the magnet is faulty and whether the circuit board is damaged to avoid malfunctions caused by component aging.
