The Elfatek OCS-CU01 is a single-channel overload control indicator that integrates load cell sensors into crane safety systems. It monitors real-time load weight, triggers relay outputs at user-defined thresholds, and communicates with higher-level control systems via RS-232 or CANBus — providing a complete protection loop from sensor to shutdown.

How does the OCS-CU01 prevent crane overload?

The unit continuously reads a connected load cell sensor. When the measured load crosses a user-programmable threshold, it activates one or more of its four relay outputs — typically wired to alarms, warning lights, or the crane's motion control circuit — to stop hoisting before an overload occurs. Advanced diagnostics detect sensor faults and wiring issues for enhanced reliability.

What output and communication interfaces are available?

Four programmable relays (RL1–RL4) with independently adjustable setpoints provide flexible control. RL1-2 and RL3-4 each share a common terminal. One analog output supports voltage (0–5/0–10/1–5/2–10 V) and current (0–10/0–20/4–20 mA) ranges for connecting to PLCs or remote displays. Data communication is via RS-232 as standard, with CANBus available as an option.

What are the power supply and installation requirements?

The unit accepts a wide-range supply of 48–265 VAC, with an optional 24–36 VDC variant. It mounts on a standard 35 mm DIN rail inside a control cabinet. Operating temperature is –20°C to +45°C as standard, with an extended –40°C to +85°C range available for outdoor or extreme-environment installations. The unit weighs 218 g and requires connecting load cell cables by color code before calibration.

FAQ

Can the OCS-CU01 handle two load cells simultaneously?

The OCS-CU01 single-input model accepts one load cell. For double-trolley or dual-hoist cranes requiring independent channel monitoring, Elfatek offers a dual-input overload indicator variant with eight relay outputs.

Is CANBus standard on all OCS-CU01 units?

RS-232 is the standard communication interface. CANBus is an optional configuration that must be specified at time of order.