Two-Step Electro-Hydraulic Brake Package for Cranes
The Two-Step Electro-Hydraulic Brake Package makes converting an Electric Overhead Traveling (EOT) Crane from cab control to radio remote or pendant control easy. The conversion requires changing the operation of the bridge brake from a foot pedal to an electrically operated brake. With the Two-Step Electro-Hydraulic Brake Package, the existing foot pedal system remains in place, and there is no need to re-size or change the existing manual brake system. This eliminates the chance for error in sizing a totally new brake and potential damage to the mechanical structure of the crane during installation of the new brake.
Two-Step Electro-Hydraulic Brake Packages are designed to be installed in parallel with an existing manually operated, cab-mounted, hydraulic foot brake. Several available configurations allow for use with a variety of crane power sources, such as 110, 220, and 440 VAC, and 250 VDC. Brake operation can be controlled by any Cattron-Theimeg Portable Remote Control systems, as well as by pendant. The standard brake package offers two (2) adjustable steps of brake application and a brake release function, thus providing the operator with precise control of the crane brakes without unnecessary load sway due to abrupt stopping. A parking brake release function for a Wagner™ HM parking brake is optionally available (PKK) model. An optional three (3) step package is also available by special configuration of the PKK brake model.
The Two-Step Electro-Hydraulic Brake Package is adjustable and can be tailored to meet your crane size, load size, and stopping distance requirements. The system includes a long-life hydraulic pump, driven by a continuous duty electric motor. The pump develops the required brake pressure; the pressure is then held in the accumulator storage chamber, where it is ready for application to the brake cylinder upon command. When applied to the brake cylinder, the pressure varies, depending upon which electric valve is actuated and its associated pressure relief setting.
Each step of braking is independently adjustable to correspond directly to the operator's stopping rate requirements. The amount of brake application pressure is selected by the portable remote control or pendant operator. Normally, a soft brake is automatically applied when bridge control is brought to neutral. When faster stops are required, hard brake pressure is selected with a push-button on the portable remote or pendant remote.
When properly installed and interfaced with the crane's control circuits, the brake systems will not permit the movement of the crane unless brake pressure is above a minimum level necessary to stop the crane. Any loss of power applies accumulated brake pressure to the brake cylinder. This provides brake pressure even when the crane power is turned off.
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