Overload Limiter

The crane overload limiter is a safety device used on cranes to prevent the crane from carrying more weight than its designed load capacity during operation. This device ensures the safety of lifting operations and prevents damage or accidents to the crane due to overloading.

Overload limiter is generally composed of three parts: control instrument, junction box and load sensor, which are mainly divided into three types according to the type of sensor: bearing seat overload limiters, pressure-side overload limiters and shaft pin overload limiters.

Bearing seat overload limiters

Suitable for crane with winch trolley

Pressure-side overload limiters

Suitable for wire rope electric hoist

Shaft pin overload limiters

Suitable for European lifting equipment, hoist, port crane, chain hoist

Overload Limiter for Cranes with Winch Trolley

  • Action error: ≤±3%F.S.
  • Comprehensive error: ≤±5%F.S.
  • Environmental temperature: -20~+60℃, ≤90%RH.
  • Protection level: Load sensor: lP65
  • Control instrument: lP44
  • Alarm point:
    • Warning when load reaches 90% of rated lifting capacity.
    • Alarm when load capacity reaches 105% of rated lifting capacity and power off after 2S.
    • Immediate disconnection when load capacity reaches 110% of rated lifting capacity.
  • Installation position: Non-transferring side of the hoisting drum

1 QCX H2B overload limiter instrument

  • Application: Suitable for overhead cranes and gantry cranes
  • Applicable to a variety of industry types of overhead cranes and gantry cranes.
  • Single sensor signal input, single relay contact output.
  • Simple and lightweight, easy to install, stable performance.
  • Simple debugging, easy to use and on-site calibration.
  • High measurement precision and accuracy, agile response, system self-test, strong anti-magnetic interference ability.
  • Many additional functions can be added, convenient and other industrial control instruments or monitoring systems, such as docking, easy to follow up processing.

2 QCX H3B overload limiter instrument

  • Application: Suitable for main and auxiliary hook cranes
  • Suitable for multi-type main and auxiliary hook cranes, gate hoist and other double hook combined cranes.
  • Dual sensor signal input, the main and vice hook is displayed, two sets of relay contact output.
  • Simple and lightweight, easy to install, strong stability.
  • Simple debugging, easy to use and on-site calibration.
  • It has high precision and accuracy, quick response, self check and strong anti-electromagnetic interference ability.
  • Additional features can be more convenient and other industrial instrumentation or monitoring system docking, easy to follow-up treatment.

3 QCX H2Z overload limiter instrument

  • Application: Suitable for grab overhead cranes and grab gantry cranes
  • Two sensor signals combined input, total display, total control.
  • Simple and lightweight, easy to install, stable performance.
  • Simple debugging, easy to use and on-site calibration.
  • Measurement precision, high accuracy, agile response, system self-test, strong resistance to electromagnetic interference ability.

4 QCX H2A overload limiter instrument

  • Application: Suitable for overhead and gantry double hook cranes of the same tonnage
  • Applicable to many types of overhead cranes and gantry cranes with the same tonnage double hook. Such as electromagnetic disk cranes, electromagnetic hanging beam crane, clamp crane.
  • Double sensor signal input, total display, total control.

5 QCX H2BY overload limiter instrument

  • Application: Suitable for many types of remote-controlled overhead cranes and gantry cranes
  • Increased high-power external crane warning devices.
  • Optional large screen display, easy to read data.

6 QCX H2C overload limiter instrument

  • Application: Suitable for lifting equipment requiring an underload control output
  • Mainly applicable to gantry crane on dam crest and the hoisting equipment which needs underload control output.
  • With overload, underload control output function, underload point can be set arbitrarily.

7QCX H2DM overload limiter instrument

  • Application: Suitable for main and auxiliary hook cranes(Sub-display sub control, total display total control)
  • Using single-chip intelligent digital circuit, dual-channel high-bit AD chip acquisition inputs.
  • Sub-display and sub-control, total display and total control, and control of main and sub-hook crane lifting capacity.
  • The machine performance is stable and reliable, easy to use, high precision.

8-QCX M overload limiter instrument

  • Application: Suitable for overhead cranes and gantry cranes(Real-time recording of operating conditions)
  • Applicable to overhead cranes and gantry cranes, based on ordinary lifting capacity limitation function, it increases the real-time recording function of the crane running condition.
  • Real-time recording of crane loading process data information, overload times, load time, weight, end time, frequency of crane operation, etc., can be visualized in the computer software to see the detailed records of the crane's work, the workload record charts and the work of the subcontracting frequency charts.

9-QCX H2W overload limiter instrument

Application: Suitable for situations where it is inconvenient to connect cable line

Wireless remote control, wireless transmission

The above control instruments can also be used with other types of sensors, such as side pressure sensors, shaft pin sensors.

Overload Limiter for Wire Rope Electric Hoist

  • Action error: ≤±3%F.S.
  • Comprehensive error: ≤±5%F.S.
  • Environmental temperature: -20~+60℃, ≤90%RH.
  • Protection level: Load sensor: lP65
  • Control instrument: lP44
  • Alarm point:
    • Warning when load reaches 90% of rated lifting capacity.
    • Alarm when load capacity reaches 105% of rated lifting capacity and power off after 2S.
    • Immediate disconnection when load capacity reaches 110% of rated lifting capacity.
  • Installation position: Fixed-end wire rope

HD3 overload limiter instrument for electric wire rope hoist 2

  • Application: Electric wire rope hoists in environments with strong electromagnetic interference, such as non-ferrous metal smelting workshops.
  • Feature: High protection level, anti-electronic interference design, wide range of voltage resistance, suitable for harsh industrial environments

HD4 overload limiter instrument for electric wire rope hoist 2

  • Application: Various types of electric wire rope hoists.
  • Feature: Applicable to a wide range of models, stable performance.

Overload Limiter for European Crane and Hoist

  • Application: European cranes, European hoists, port crane, chain hoists and where other types of sensors cannot be installed.
  • Action error: ≤±3%F.S.
  • Comprehensive error: ≤±5%F.S.
  • Environmental temperature: -20~+60℃, ≤90%RH.
  • Protection level: Load sensor: lP65
  • Control instrument: lP42
  • Alarm point:
    • Warning when load reaches 90% of rated lifting capacity.
    • Alarm when load capacity reaches 105% of rated lifting capacity and power off after 2S.
    • Immediate disconnection when load capacity reaches 130% of rated lifting capacity.
  • Installation position: The position of the shaft pin in the pulley

overload limiter wiring diagrams

  • Application: European crane and hoist.
  • Feature: 0.8-inch LED display, display data clearly, display angle of 45 degrees, convenient for ground operators to watch.

Overload Limiter for Explosion-proof Industry

overload limiter for explosion proof double girder crane 2

  • Application: Suitable for explosion-proof double girder overhead and gantry cranes
  • Feature: Mainly consists of explosion-proof control box, digital display instrument, explosion-proof junction box and load cell, and can be used with various types of intrinsically safe load cells.

overload limiter for explosion proof electric wire rope hoists 2

  • Application: Suitable for explosion-proof electric hoists
  • Feature: Compact size, easy installation, simple commissioning, low failure rate

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