Special requirements for camera installation in elevators
The elevator shaft has a special environment: small space, strong electrical interference, and restrictions on accompanying cables. Explain the key points of equipment selection, power and network access, and screen debugging.
Environmental characteristics and difficulties
- The car space is small (commonly 1.6m × 1.4m), and a super wide angle is required to fully cover it.
- Traveling cable resources are tight, and there are usually no extra network cables available.
- There is strong electromagnetic interference caused by frequency converters and traction machines.
- The car roof construction space is limited and requires the cooperation of the elevator maintenance unit.
Equipment selection
- Focal length: Prioritize 2.8mm (or even 1.4~2.8mm super wide angle) to ensure coverage of the entire car and doorway.
- Form: Use a special elevator camera (flying saucer type/dome type), which is small in size, hidden in appearance, and not easy to be blocked.
- Resolution: 2 million is enough. Too high resolution is of little significance in a small space but increases bandwidth.
- Protection: It has a certain anti-interference design, and the metal shell is better.
Getting electricity and internet
| Plan | Practice | Applicable |
|---|---|---|
| Traveling cable + network cable | Use the spare core in the traveling cable or thread a network cable | When installing a new elevator or having a spare cable |
| Power line carrier | Transmitting network signals through elevator lighting power lines | When no network cable is available |
| Wireless bridge | Establish a wireless link between the car roof and the top/bottom of the hoistway | The number of floors is not high and the hoistway is less blocked |
| Local storage + wireless export | Camera local SD card recording, regular export | Security in extreme situations |
Key points of construction and commissioning
- It must be coordinated by qualified elevator maintenance personnel, and it is strictly prohibited to enter the shaft without permission.
- Priority is given to taking power from the car lighting circuit. Pay attention to the voltage level (usually AC 220V or DC 24V), and an adapted power supply is required.
- Cables should be fixed securely and leave enough margin to avoid long-term bending and breakage.
- The camera should be installed as far as possible diagonally above the car door, looking down diagonally, taking into account both face and floor display.
- During debugging, check the screen with people in the car to confirm that there are no dead spots or serious distortions.
Common faults
- Scrolling horizontal stripes on the screen: typical electromagnetic interference, check the grounding and whether it is laid in the same pipe as strong electricity.
- The screen is interrupted during operation: the core of the accompanying cable is broken at the bend, and the cable needs to be checked.
- Can't see clearly at night: The car is not well lit, so choose a low-illumination model or a special model with fill light.
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