888-2406-002
4-43
WARNING: Disconnect primary power prior to servicing.
Overall System Theory
•
PA Current - The current draw of each PA is monitored by measuring the voltage
drop across 0.01 ohm resistors, R11-R18, on the Z-Planes. The resistors show up
as part of the Divider Schematic. This allows the current of each individual PA to
be available on the Diagnostics Display. To check the PA currents press
[METERING A,B,C].
•
PA Supply Voltage - The Voltage of PS1 is monitored with fused samples also
from the Z-Plane Divider. To check the PA supply voltage press [METERING
B,C].
•
PA Gate Voltage - Each individual PA gate voltage can be checked on the Diag-
nostics Display by pressing [METERING B,D].
•
PA Temperature - There is a temperature sensor on each PA which sends a tem-
perature sample voltage to the PA Controller.
•
PA ISO Resistor Temperatures - VTEMP PA1 through VTEMP PA8 -Each ISO
resistor has a thermistor, used as a temperature sensor, attached to it for metering
and fault monitoring. To check the ISO resistor temperatures press [METERING
C,C then D to see B5-B8]. A rise in the ISO resistor temperature indicates an
imbalance in the phase or amplitude of a PA output.
NOTE:
The temperature of the different PA ISO resistors (A1-A8) can vary quite a
bit, but are considered okay if they are under A 75°C.
AZ, which also shows up in this screen, is the temperature indication for the 2.5kW,
2 way combiner isolation load resistor. A rise in this temperature would indicate an
imbalance between the outputs of the two foursomes on the Z Plane.
4.7.4.3 Crossover (XOVER) Protection (Z2R only)
Each PA Controller has what is called a Watchdog Timer. The outputs of the
watchdog timers are each monitored by the other PA Controller. If the pulses from
the watchdog timer are interrupted, due to either hardware or software problem, the
other PA Controller will initiate what is called a Crossover (or XOVER). Basically,
the operational PA Controller will apply a mute to all of the PAs associated with the
defective PA Controller, and switch them out of circuit before releasing the mute on
its own PAs. Maximum power output with one PA Controller out is approximately
33% of nominal.
NOTE:
The Power Supplies, PS1 and PS2, each power the PAs associated with the
same number PA Controller. This means that the loss of one power supply
will create the same scenario as loss of one PA Controller (the loss of 2 PA
per foursome).
Summary of Contents for Platinum Z2 CD
Page 4: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
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Page 8: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
Page 10: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
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 ...