User Manual

Hardware Installation and Setup Introduction
31
5.12.4 System Power Switch
The system power switch is a heavy duty toggle switch with a rating of 15A at 12VDC.
This provides a safety factor of approximately 50%. Mount the switch in a convenient
location, since it is used as the primary system power switch.
Wire the system power switch as shown in the power distribution diagram.
5.12.4.1 Barrier Strip Wiring
Two barrier strips are used, as shown in the diagram: switched and un-switched. The un-
switched barrier strip is used to provide constant power to the mobile PCs, and to provide
a convenient connection point for any connected equipment that should operate in the un-
switched mode. The switched barrier strip is used to connect to the “ignition” wires of the
server PCs so they shut down gracefully (delayed) when switched off. This prevents file
corruption. The Gateway Router (GR), and Ethernet switch also connect to switched
power.
The system power toggle switch connects the barrier strips together, and provides
switched power to the switched barrier strip.
Connect all equipment to the switched barrier strip except the main power leads of the
mobile PCs (servers).
Note: Items of equivalent current carrying capacity such as ring lugs, spade lugs, barrier
strips, or barrier jumpers may be used.
5.12.4.2 Gateway Server
Use the following procedure to install the power wiring to the Gateway Server:
1. Locate the preformed mobile PC cable harness.
Note: It uses the 8-conductor Molex connector to plug into the PC. Since this harness
is only about 12 inches long, it may be necessary to extend the red, black, and white
power wires to reach the barrier strips. It is acceptable to use butt splices to extend the
power wires. Make sure any wire used to extend is a minimum of 18AWG.
2. Connect (via crimp spade lugs) the power wires to the distribution strips as shown in
the power distribution diagram.
3. Dress and tape the remainder of the wires in the harness, since they are unused.