Circuit Connections Installation
XPIQ PN 51013:C 7/01/03 39
Backup Amplifiers
One or two amplifiers on the XPIQ-MB can be designated as backup amplifiers. If each primary
amplifier is to have its own backup amplifier, the amplifier which is plugged into connector P3 will
be the backup for the primary amplifier plugged into P1. The amplifier which is plugged into
connector P4 will be the backup for the primary amplifier plugged into P2.
When two different types of amplifiers are used on the same motherboard and backup of both is
desired, two backup amplifiers must be used, matching type to type. For example, an XPIQ-AA25
may be used as a primary amplifier and plugged into P1, and an XPIQ-AA2270 may be used as a
primary amplifier and plugged into P2. To back up both amplifiers, an XPIQ-AA25 must be
installed into P3, and an XPIQ-AA2270 must be installed into P4.
An external backup amplifier must be used to back up the same type of amplifiers on other
XPIQ-MBs.
An application may occur where a single amplifier is used to back up primary amplifiers on more
than one motherboard. The backup amplifier must plug into connector P4 of one of the
motherboards. Cabling connectors J4, J5, J6 and J7 (refer to Figure 2.10 on page 36 and Figure
2.11 on page 37) between the two motherboards will enable one amplifier to back up multiple
primary amplifiers as illustrated in Figure 2.15. Note that only one XPIQ-MB can have earth fault
detection enabled. This application requires that all primary amplifiers be the same type as the
backup amplifier.
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