Probe of mobile service with a crane to exercu00eccio a power up, the probe of the mobile service subject to a variable load.Control method of a force exerted by a crane to the top, driven by an engine and method of operation of a crane is subject to a variable load

摘要

"The probe mobile service with a crane to exercu00eccio a power up, the probe of the mobile service subject to a variable load.Control method of a force exerted by a crane to the top, driven by an engine and method of operation of a crane is subject to a variable load.A probe of the mobile service (10) for wells includes a crane (12) driven by an internal combustion engine (32).In response to the crane to exert a predetermined lifting force, lifting force (14) is limited to limit or reduce automatically the speed of the motor.