Electrical Control Cabinet

TM 5-5420-279-23

Fig 1.9 Far Bank Support

The beam is then stabilized by diagonal telescopic hydraulic cylinders which incorporate a

closed loop hydraulic system actuated by a pressure-sensitive valve in the column. Lowering of

the launch beam operates the pressure-sensitive valve and closes the hydraulic line, which has

been allowing free operation of the hydraulic cylinders. The hydraulic pressure generated by two

self-contained hydraulic pumps is diverted to the locking mechanism in each of the struts and

secures them in position. This locks the far bank support assembly in this lateral setting and

creates a stable support for the launch beam.

Indicator flags, attached to the two pumps confirm the far bank support is locked in

position. There is no need for an operator to cross the launch beam to manually adjust the far

bank support prior to commencement of the bridging module deployment.

For safety the far bank support has been designed so that failure of either of the two

pumps or cylinders can be accommodated. Pump failure being indicated by only one indicator

flag being visible.

1-10-27 Electrical Control Cabinet

The electrical control cabinet is mounted on the left side of the launch frame and interfaces

between the chest pack controls and the system hydraulics. The cabinet is constructed of

aluminum alloy sheet with an internal spring sub-frame to provide environmental and shock

protection. It provides the power and logic circuitry to control the solenoid valves, which operate

the various system functions on the vehicle.

A power supply-regulating feature is incorporated into the cabinet to correct the power

supply for the variations, which occur in the vehicle, supply voltage. The cabinet also contains a

heating circuit to ensure reliable operation of the logic and power circuitry and components during

1-19