SOS

Snag Overload System

The Malmedie Safety Coupling MSC is the heart of the the first non-hydraulic snag load protection system SOS for container cranes. It eliminates the danger of structural damage starting at the motor, which is beside the brake disc the major source of snag inertia load.

At any kind of overload the inertia and the driving force of the (AC!) motor is separated from the hoist by the MSC within one millisecond. To reduce the remaining inertia coming from the brake disc, LiTec® brake discs offering 60% less inertia than steel discs are in use.

The special designed service and emergency brakes (fast setting execution) avoid at the same time a reverse of the rope drum. The reaction time of the system in combination with its own and separate PLC is ultra fast and completed, before conventional hydraulic systems are able to react.

Beside the advantage of having even less maximum rope forces compared to a conventional snag system, the system is much less in weight, low maintenance and cost effective.

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