User Manual

MXi AMPLIFIER CONTROLLER BOARD REV.2
PUB06-82 Rev 1 July 17, 2007 06-82-20 MXi Amplifier Controller Board Rev.2
needed and the fan interlock status would then normally be OFF. This makes it important to indicate to the
operator the intended state of the transmitter as either ON or OFF to correctly interpret the subsequent status.
This sample LCD screen shows the state when the transmitter is ON and the interlocks are OK
Figure 11 Transmitter On, Interlocks OK Screen
In the case when the transmitter is ON and the interlocks are BAD (there is an open interlock), the LCD displays
the top priority interlock that is opened on the second line. Note that it is possible to have more than one interlock
that is open, so the LCD sorts these out in priority and displays the higher priority one. An example of this is given
in the sample display below.
Figure 12 Transmitter On, Interlocks Bad Screen
When the transmitter is OFF, the system still looks at some of the interlocks that should be closed regardless of
the state of the transmitter. The two interlocks that are ignored when the transmitter is OFF are the PSOK and
FANS. An example of this is given in the sample display below.
Figure 13 Transmitter Off, Interlocks OK Screen
The third line of the display has a number of status lights with a legend describing the particular status underneath
and all enclosed in a dashed line box. When the light is fully darkened, it indicates that this particular status is true
and that interlock is closed (OK). When the light is hollow, it indicates that this particular status is false and the
interlock is open (BAD). Certain related status are grouped together in the same box. The purpose of these status
is to point the operator to the area that is currently causing the RF amplifier to be shut down. Each status is
detailed below.
3.4.1 TRIP
VSWR Trip Status
• Lit when there have been no VSWR trips since the last time this was cleared.
• Not lit when the system has seen at least one VSWR trip.
Note that this does not mean that there is a current VSWR trip but that one did occur.