Introduction
The microcomputer overspeed control switch uses a 32-bit ARM microprocessor as the core, cooperate high-precision signal acquisition circuit for real-time sampling and intelligent analysis of hoisting mechanism speed. Supporting multiple input methods such as encoder, proximity switch and pulse signal, it can simultaneously monitor two speed channels—hoisting and traveling—with multiple protection logics including overspeed, underspeed, slip, shaft-break and sensor fault. Parameters are set via panel buttons or host computer software; the digital tube real-time displays current speed percentage, and outputs corresponding fault codes for troubleshooting during faults. Built-in optoelectronic isolation and surge protection offer strong anti-interference; it can be connected to RS485 communication network for remote monitoring and data tracing, widely compatible with various electric hoists, bridge cranes and gantry cranes, meeting intelligent safety management needs of modern lifting equipment.
Application
Automotive industry
Medical industry
Machinery industry
Amusement facilities industry
Clothing industry / Apparel industry
Our Advantage
High-accuracy microcomputer intelligent control: Using 32-bit ARM microprocessor with speed sampling frequency up to 10kHz, overspeed judgment accuracy ±1%, response time ≤0.05s, triggering protection at millisecond level in early stage of hook slipping, far superior to traditional analog circuit overspeed switches.
Integrated multiple protection functions: Integrating overspeed protection, underspeed detection, slip monitoring, shaft-break protection and sensor fault diagnosis, not only preventing overspeed falling but also timely detecting hidden faults such as brake slip and drive shaft breakage, offering more comprehensive safety protection.
Integrated multiple protection functions: Integrating overspeed protection, underspeed detection, slip monitoring, shaft-break protection and sensor fault diagnosis, not only preventing overspeed falling but also timely detecting hidden faults such as brake slip and drive shaft breakage, offering more comprehensive safety protection.
Strong anti-interference with stable operation: Full optoelectronic isolation for inputs and outputs, built-in surge suppression and EMC filter circuits effectively resist strong electromagnetic interference from inverters and electromagnetic chucks, passing industrial-grade EMC tests, ensuring long-term stable operation without false alarms in complex electromagnetic environments.
Networked communication for intelligent management: Standard RS485 communication interface supporting Modbus RTU protocol, real-time uploading speed, status and fault records to the crane safety monitoring system, enabling remote monitoring, data tracing and preventive maintenance, meeting intelligent management requirements.
Core Parameters
| Parameter | Specification |
| Applicable Capacity | 0.5t ~ 100t |
| Overspeed Trigger | 100% ~ 150% （adjustable） |
| Response Time | ≤0.05s |
| Control | MCU intelligent control |
Technical Specifications
| Parameter | 0.5~5t | 10~20t | 32~50t | 80~100t |
| Applicable Capacity | 0.5/1/2/3/5t | 10/16/20t | 32/50t | 80/100t |
| Applicable Motor Power | 0.8~7.5kW | 13~18.5kW | 22~30kW | 37~45kW |
| Input Signal | Encoder / Proximity Switch / Pulse (Optional) | Encoder / Proximity Switch / Pulse (Optional) | Encoder / Proximity Switch / Pulse (Optional) | Encoder / Proximity Switch / Pulse (Optional) |
| Input Channels | Hoisting + Travelling (2 Channels) | Hoisting + Travelling (2 Channels) | Hoisting + Travelling (2 Channels) | Hoisting + Travelling (2 Channels) |
| Rated Speed Range | 900~2800 rpm | 700~1400 rpm | 500~1000 rpm | 300~750 rpm |
| Overspeed Trigger | 100%~150% adjustable | 100%~150% adjustable | 100%~150% adjustable | 100%~150% adjustable |
| Response Time | ≤0.05s | ≤0.05s | ≤0.05s | ≤0.05s |
| Measurement Accuracy | ±1% | ±1% | ±1% | ±1% |
| Display | LED digital tube | LED digital tube | LED digital tube | LED digital tube |
| Output Contact | Relays ×4 (Normally Open + Normally Closed / NO+NC) | Relays ×4 (Normally Open + Normally Closed / NO+NC) | Relays ×4 (Normally Open + Normally Closed / NO+NC) | Relays ×4 (Normally Open + Normally Closed / NO+NC) |
| Contact Capacity | 5A / 250VAC | 5A / 250VAC | 10A / 250VAC | 10A / 250VAC |
| Communication | RS485 （Modbus RTU） | RS485 （Modbus RTU） | RS485 （Modbus RTU） | RS485 （Modbus RTU） |
| Power Supply | DC 24V / AC 220V（optional） | DC 24V / AC 220V（optional） | DC 24V / AC 220V（optional） | DC 24V / AC 220V（optional） |
| Protection Grade | IP54 （IP65 Sensor） | IP54 （IP65 Sensor） | IP54 （IP65 Sensor） | IP54 （IP65 Sensor） |
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