Technalogix TAV-1000, Manual

Page: 28 / 59

VI-2
Interface Components
The interface section of the Series IIH PCB includes the front panel switch interfacing in addition to the
buzzer and carrier disable output circuits.
The (4) momentary switches found on the front panels of each enclosure are tied to the microcontroller
through an isolation stage to avoid any static discharge or noise on the switch wiring from reaching the
microcontroller. Optoisolators U5 and U6, in addition to R4…R15 create the necessary isolation for the
sensitive microcontroller. By depressing any momentary switch, a ground (0V) is applied to the input of the
optoisolators. The optoisolators will, in turn, output a ground (0V) to the microcontroller.
The membrane tactile switches found on the front panels of the enclosures operate in the following manner
with a depress:
POWER – When unit is plugged in, AC is supplied to the fan and switching power supply input, but the
amplifiers are still turned off. In order to turn the amplifiers on, wait ten seconds after plugging the PA in
and push in the “POWER” tactile button. The LCD will read “Soft Start Warm Up, Please Wait”. After
ten seconds the bias voltages will be turned on and you may then plug in the RF drive. Depress for (1)
second to turn on and (3) seconds to turn system off. In the case of multiple enclosures, all POWER
switches are tied together in each enclosure, so only one needs to be depressed.
NAVIGATE –
Turns on backlight to LCD and displays forward and reflected RF power and DC supply
voltage parameters. When power amplifier is first turned on, the LCD comes on automatically and this
information is displayed. Information is displayed for approximately 2 minutes before the backlight turns off
and the display is cleared. This is set up so as not to burn any pixels into the LCD from extended on
time. In the case of multiple enclosures, the NAVIGATE switches are individual to each enclosure.
SELECT –
Turns on backlight to LCD and displays forward and reflected RF power and DC supply
voltage parameters. When power amplifier is first turned on, the LCD comes on automatically and this
information is displayed. Information is displayed for approximately 2 minutes before the backlight turns off
and the display is cleared. This is set up so as not to burn any pixels into the LCD from extended on
time. In the case of multiple enclosures, the SELECT switches are individual to each enclosure.
RESET –
Tactile pushbutton resets the monitor and control system. The amplifier gets shut down for
under 0.5 seconds and comes back on with each depress of the reset button. At the same time, all fault
counters in the microcontroller software are reset and the LCD is reset in the same manner as it is with a
depress of the NAVIGATE button. Reset switches are individual to each enclosure but may be tied
together externally through the remote port, as explained later in this section.