4-50
888-2406-002
WARNING: Disconnect primary power prior to servicing.
Overall System Theory
SUPPLY_DISABLE at U30-11 to shut off the power supply and a
SYSTEM_MUTE via U30-10 which will mute the exciter and IPAs.
4.7.6.1.2.1 Remote Transmitter Turn OFF
REM_OFF(BAR) is activated via the remote control interface. When the remote
control pulls this line low, it will activate optical isolator, U23, bringing U23-6 low.
This is inverted at U27-6 and applied to U25-10 as an active high signal. The input
at U25-9 is not used and will always be high. Therefore the AND gate output at
U25-8 will follow the U25-10 input. The remote off command is then tied in to the
same off command circuitry discussed earlier.
4.7.6.1.2.2 Failsafe
The Failsafe input can be used basically for any purpose which requires muting of
the transmitter output, such as failure of the remote control, or external RF
switching systems. Customer connection to the Failsafe circuit can be done in one
of three places:
a.
At the TB1 remote control terminal strip in the rear of the transmitter (see
Section II, Installation). As shipped from the factory, there is a jumper from
TB1-8 to TB1-10(ground).
b.
It can also be connected directly to the Life Support Board to J4-7 and J4-8.
Be very careful when connecting to these terminals. The pressure necessary
to operate the wago connector on the rear of the board must be properly sup-
ported to keep from bending and possibly damaging the Life Support Board.
c.
Lastly, it can be connected at J20-8, a 37 pin D connector, located on the Dis-
play/Backplane Board directly behind the controller front panel. This con-
nects to the Life Support Board at J1-A6.
In any of the three cases, Failsafe is an active low signal which must be pulled low
before the transmitter will output any power. To use the failsafe, the factory jumper
must be removed from TB1 near the back of the transmitter.
When the failsafe circuit is satisfied, it will cause U23-8 and U25-4 to go low and
U25-6 will stay low, having no effect on transmitter operation. If the Failsafe
connection is opened, U23-8 and U25-4 will go high. The FAILSAFE_ENABLE
signal from the Master Controller is not used and is always high making U25-5
high. This allows a Failsafe open condition to pass the high to U29-10 which ties
into the SYSTEM_MUTE circuit. In the Life Support Mode the signal
MASTER_NORMAL(BAR) will be high at U31-2 and will enable U25-5 and the
Failsafe signal.
Summary of Contents for Platinum Z2 CD
Page 4: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
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Page 70: ...3 14 888 2406 002 WARNING Disconnect primary power prior to servicing Operator Guide ...
Page 130: ...4 60 888 2406 002 WARNING Disconnect primary power prior to servicing Overall System Theory ...
Page 194: ...6 38 888 2406 002 WARNING Disconnect primary power prior to servicing Troubleshooting ...
Page 196: ...7 2 888 2406 002 WARNING Disconnect primary power prior to servicing Parts List ...
