Customer-specific solutions

In the case of an overload, or when the load gets stuck, the overload protection unit stops the lift, preventing accidents. The unit has a memory, that can be used for tracking the cranes overall stress.

  • Can be installed in new machines and those already in use
  • Easy deployment
  • Easy to calibrate
Weighing solutions for industrial use
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Ensure safe lifting with confidence

Tamtron’s Overload Protection Unit (OPU) keeps lifting operations safe, controlled and predictable by actively preventing equipment overloads and structural stress. It stops the lifting motion the moment a load exceeds the safe limit or gets stuck, protecting both machinery and operators. OPU can be installed easily, thanks to its compact, DIN-rail compatible design, and you can integrate it smoothly into cranes, hoists, elevators, lifters and other machinery through its versatile input and output connections.

In demanding industrial conditions, OPU delivers precise, real-time supervision. It maintains reliable performance through a rugged build that withstands heavy daily use. The system continuously checks sensors, cables and operational status with automatic diagnostics, keeping the operator aware of any issue as it arises. When OPU detects overload or unexpected resistance, it stops the lift immediately to prevent equipment damage and unsafe situations.

The Overload Protection Unit also gives you detailed insights into every overload event. It records event data, including date, time and load information, so you can review incidents, report them clearly and track long-term patterns. With built-in load tracking, you can follow cumulative stress levels and schedule maintenance based on real data, reducing downtime and avoiding premature wear.

When you need additional stability, OPU supports stability control to prevent unbalanced lifting or tipping risks. You can connect the system to PLC automation through the optional 4–20 mA signal amplifier, enabling seamless use in both modern and existing equipment setups. With these capabilities, Tamtron’s Overload Protection Unit helps to improve safety, extend equipment lifecycle and strengthen operational efficiency across all lifting environments.

Technical specifications and options

Specifications
Dimensions 104 mm × 90 mm × 62 mm (W × H × D)
Operating voltage AC input: 100–240 VAC, 50/60 Hz, 15 W
DC input: 10–30 VDC, 12 W
Relay outputs 3 pcs of SPDT, 250 VAC, 16 A
Load cell inputs 2 pcs of strain gauge inputs
4/6-wire
Excitation voltage: 5 VDC, 90 mA max
Signal level: ±10 mV max
AD-converter 24-bit delta-sigma
Analog outputs 4–20 mA, user-programmable level or
0–10 V, user-programmable level
Digital inputs 2 pcs of optically isolated 4–30 VDC inputs
Real time clock Real-time clock and calendar with battery backup
Load tracking Non-volatile memory for 250 time counters
Maximum load capture with time stamp
Connectivity USB-A: Flash memory stick, parameters, load tracking
USB-B: Firmware update
RS-485: Isolated data link for external OPU
RS-232: Isolated external display data output
Local display 20 characters per row, 2 rows, backlight
Keyboard 5 push buttons
External display 6-digit 7-segment red, 125 mm segment height
IP classification IP20 (IP66 enclosure available)
Operating temperature -30 °C … +60 °C

 

Options
External display Option
Plastic protective case Option

 

Load Cells

Read more about Tamtron’s custom Load Cells:

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