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SHC-1 Monitor Load Series
The SHC-1 Monitor Load Series is designed for measuring, displaying, and controlling various hoist, door, bridge, and other automated devices that handle heavy loads. It supports a wide range of pressure (tension) force load sensors and is controlled by a single-chip microcomputer. The system includes a built-in WatchDog self-reset circuit, ensuring reliable operation even in harsh industrial environments. The software incorporates multiple anti-interference measures to maintain stability and accuracy.
This series features a power-down memory function, allowing all preset data to be permanently stored after a power failure. It also offers multiple output interfaces, such as control relay contacts and an RS485 communication port, making it easy to integrate into networked control systems. The device is available in several structural configurations, ensuring long-term continuous operation and high reliability.
Second, Main Technical Performance
1. Number of measurements: 1 channel
2. Measuring range: 0 ~ 400T (maximum)
3. Resolution: 0.1T
4. Basic error: ±1% FS ±1 digit
5. Telemetry distance (from sensor to meter): ≤100m (for 0~20mV interface), ≤1km (for 4~20mA interface)
6. Display mode: High-brightness LED digital display or LCD screen
7. Parameter setting: Field adjustment using buttons
8. Alarm Function:
â— Alarm settings: Users can set pre-alarm (90% of rated load), full-load alarm (100% of rated load), and overload alarm (110% of rated load) via buttons. Up to 5 alarm points can be configured according to user requirements.
â— Alarm indication: When the load reaches the set point, the corresponding indicator light turns on, an audible alarm sounds, and the system triggers appropriate actions.
9. Output Options:
- Relay output: Each alarm point can trigger a relay contact with a capacity of AC220V 3A.
- Digital output: BCD code (TTL level)
- Analog output: 4~20mA current (load resistance ≤500Ω)
- Standard serial communication interface: RS485
10. Operating Conditions:
- Power supply: AC220V ±10%, 50Hz ±2Hz
- Power consumption: 20W
- Ambient temperature: -10~40°C
- Relative humidity: ≤90% RH at 40°C
Third, Working Principle
The single-chip microcontroller stores pre-alarm values, full-load alarm values, overload alarm values, no-load calibration values, and full-load calibration values in internal EEPROM memory based on user input. The A/D converter then reads the signal from the load cell, applies digital filtering and scaling to determine the actual load value. This value is displayed on the screen and compared against the set alarm thresholds. If the threshold is reached, the corresponding relay, indicator light, and audible alarm are activated. The system also outputs BCD and 4~20mA current signals.
Communication with the host computer is facilitated through the RS485 interface using a standard communication protocol.
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