9/15/06
888-2586-001
4-65
WARNING: Disconnect primary power prior to servicing.
Section 4 Overall System Theory
Platinum Z16HD+
go low and Q_NOT will go high. The low signal from the Q output is inverted at U16-
13, and pulls the MASTER_NORMAL(BAR) signal high (this signal is normally low
when the Master Controller is working). The high Q_NOT signal at U4-7 is inverted at
U16-14 and U16-15. U16-14 pulls the MSTR_NORMAL 1 signal low while U16-15
pulls the MASTER_NORMAL signal low (these signals are normally high when the
Master Controller is working).
MASTER_NORMAL
This signal goes low when the Master Controller fails and only has one function. It is
the control signal for U5-13, an analog switch. The input to the switch at U5-1 is the
analog control signal, MSTR_IPA_CTL from the Master Controller APC circuit, which
controls the IPA gate voltage and therefore the power output of the transmitter. When
the Master Controller is working, the analog IPA control signal passes through to U5-2.
Provided there is no SOFTSTART_MUTE or SYSTEM_MUTE, the IPA control signal
will also pass through to U5-3 and on to U15-3. U15 buffers the signal and sends it to
IPA select relays, K2 and K3. K2 and K3 direct the IPA control signal to the active
IPAs.
When the Master Controller fails, MASTER_NORMAL will go low, opening the U5-
13 switch. The MANUAL PWR REF pot R25 now controls the transmitter power
output. This is factory set for 1/4 of the rated transmitter power output.
MSTR_NORMAL 1
This signal goes low when the Master Controller fails. Its primary responsibility is to
disconnect all of the control lines coming from the Master Controller via AND gates. It
causes the following actions to occur:
a.
MSTR_NORMAL 1 applies a low to AND gate U6-4, fan speed select gate.
When in Life Support Mode the fan will be forced to high speed operation due to
the possible higher than normal dissipation when running at reduced power. The
output of AND gate U6-6 passes through to U16-16 and on to the Low Voltage
Power Supply Board and the fan select relay, A19K3.
b.
MSTR_NORMAL 1 applies a low to AND gate U6-10. This interrupts the
SUPPLY_DISABLE command from the Master Controller to the PS Controller
by holding U6-8 low. The SUPPLY_DISABLE is an active high command,
which is used to place the PA Power Supplies in standby mode (standby mode is
when the tap SCRs are all shut off but the discharge circuit is not activated).
c.
MSTR_NORMAL 1 applies a low to AND gate U25-13. This inhibits the Master
Controller from giving the transmitter OFF command. The OFF command can
still be given directly via the front panel overlay button or by remote control,
REM_OFF(BAR). The remote inputs REM_ON_LOW, REM_OFF and FAIL-
Содержание Platinum Z16HD+
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