4-60
888-2586-001
9/15/06
WARNING: Disconnect primary power prior to servicing.
Platinum Z16HD+
Section 4 Overall System Theory
the U25-10 input. The remote off command is then tied in to the same off command
circuitry discussed earlier.
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 for external RF switching
systems. Customer connection to the Failsafe circuit can be done in one of three places:
a.
At the TB3 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 oper-
ate the Wago connector on the rear of the board must be properly supported 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 Display/
Backplane Board directly behind the controller front panel. This connects 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.
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. U31-1 is always high making U25-5 high,
allowing 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.
4.8.7.1.3 Interlock
The Interlock input can be used for any purpose which requires shutting off the
transmitter, such as a protective door being opened or a water (or air) switch on a
dummy load. The primary purpose is for the protection of personnel.
a.
At the TB1 remote control terminal strip in the rear of the transmitter (see Section
II, Installation). A jumper is installed at the factory to make the Interlock connec-
tion. It is installed between TB1-7 and TB1-6(GND).
b.
Life Support Board at J4-10 and J4-7 (ground). If connection is made here, leave
connection open at TB1-7.
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