Hirschmann load moment limiting system, a safety protective
unit for real-time calculation of load moment.
When actual load moment is approaching overloading value, audible and visible warning will be
sent out, and the dangerous movement will be automatically stopped ahead of overloading.
Overload memory function (black box) and fault self-diagnosis function are available.

Hydraulic system: hydraulic balance valve, hydraulic relief valve, double-way hydraulic valve, etc.
are available to make hydraulic system safe and stable.
The advanced microprocessor technology and embedded operating system are adopted in the
control system, which can realize low power dissipation, high performance, high sensitivity and
easy operation. LCD touch screen displays the load moment percentage, rated lifting capacity,
working radius, boom length & angle, Max. lifting height, working condition codes, part sof line
limiting angle, information codes and other lifting operation parameters, illustrating with English
and pictures. Equipped with pre-alarm and overload alarm, system overload control output can
effectively avoid danger during lifting. Special working angle limit function makes more reliable
The safety system includes displayer, central controller, length/angle sensor, over-winding switch,
oil pressure sensor, etc.
Lowering limiter switch can make the drum maintain three circles of wire ropes at least.

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