888-2406-002
4-51
WARNING: Disconnect primary power prior to servicing.
Overall System Theory
4.7.6.1.3 External Interlock
The External 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 Exter-
nal Interlock connection. 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.
External Interlock is an active low signal which must be pulled low before the
transmitter may be turned on. To use the External Interlock, the factory jumper from
TB1-7 to TB1-6(GND) must be removed. External Interlock circuit operation was
discussed earlier in the Transmitter Turn On discussion.
4.7.6.1.4 SYSTEM_MUTE
The SYSTEM_MUTE line is used to mute the RF output from the exciter and IPA.
It is the summation of mute signals from several sources which are discussed below.
The SYSTEM_MUTE is an active high signal at U30-6 and passes through to U38-
3. The signal then splits and goes to relay K1-13 as the exciter mute and to inverter
U13-7 as an IPA mute.
a.
Exciter Mute - K1 directs the mute signals, SOFTSTART_MUTE and
SYSTEM_MUTE to the on air exciter (K1 is shown in the RESET or Exciter
1 on air mode). The mute will pass through to either U36-8 or U36-11
depending on the position of K1. If your exciter requires an active high to
mute the exciter then JP1 and JP2 should be left in the 1-2 position. This
directs the signal through inverter U27-2 or U27-4 and then through inverter
U28-1 or U28-2 for an active high mute signal to the exciter(s). If your exciter
requires an active low to mute, then JP1 and JP2 should be placed in the 2-3
position where the mute signal bypasses the U27 inverters and is inverted to
an active low by U28-1 or U28-2, again depending on the position of K1. For
proper positioning of these and other related jumpers, refer to “Alternate
Exciter Installation” in Section II, Installation.
b.
IPA Mute - When U5-5 goes low, the analog switch will open, disconnecting
U5-4 and U5-3, and the IPA gate voltage will go maximum negative, via R30,
effectively shutting the IPA off. Relay K2 directs the IPA gate control voltage
to the active IPA, when dual IPAs are used. K3 is not used in the 2kW trans-
mitter.
The following is a list of signals which can cause a SYSTEM_MUTE:
Summary of Contents for Platinum Z2 CD
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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 ...
