4-48
888-2406-002
WARNING: Disconnect primary power prior to servicing.
Overall System Theory
4.7.6.1.1.1 Pulse Stretcher, U4
U4 is a pulse stretcher which will output a 100mSec pulse whenever the transmitter
ON button is pressed. Provided there is no power failure signal,
POWERFAIL(BAR) from U37-7, The 100mSec pulse from U4-10 will pass
through to U6-13, U8-12 and leaves the board to reset the PA and PS Controller
Boards at J1-A83.
•
TX_RESTART - Every time an ON command is received all of the controller
boards will be reset, initializing and clearing any faults. The transmitter will then
try to come up to full power. If a fault returns, the transmitter will simply revert
back to the previous fault condition.
NOTE:
Pressing an ON command while the transmitter is running will also cause the
controllers to re-initialize and clear any previous faults. However, it will not
erase any faults from the Diagnostics Fault Log. Basically, any components
which were shut off due to a fault will now be turned back on, such as PAs or
controllers.
4.7.6.1.1.2 External Interlock
The TX_RESTART signal from U4 is gated by AND gate U6-13. This is the turn on
signal for the contactor and will only pass if U6-12 is also high. U6-12 is the
External Interlock signal. To satisfy the External Interlock, there must be a closed
connection between J4-10 and J4-7 (GND) on the Life Support Board (or between
TB1-7 and TB1-6 on the Remote Control Interface terminal strip). This will activate
the optical isolator, U24 making U27-11 and U33-1 both low. U27-10 inverts the
signal and makes U6-12 high, allowing the high turn on signal at U6-13 to pass to
inverter U16-6. U16-11 now sends a low to the SET input on the contactor turn on
relay, K4 (the contactor is shown in the RESET position).
The External Interlock line going to U33-1 ties the external interlock into the OFF
command circuit. When the External Interlock is closed, this line is low and U33-1
ignores the input. If the External Interlock were opened, the line would go high
which would send a high to the RESET input on relay K4 and the main AC
contactor would disengage.
4.7.6.1.1.3 Contactor Turn On Relay, K4 (Latching)
K4 is a latching relay which only needs to be pulsed to make it change positions and
will then stay in that position until the opposite input is pulsed to make it change
back. When K4 is SET, K4-13 will go high and K4-4 will go low. K4-13, the
CONTACTOR-ON-STATUS signal for the Master Controller, is AND gated with
POWERFAIL and inverted at U16-12 to become the CONTACTOR_ON(BAR)
signal. This signal is sent to the Low Voltage Power Supply Board where it activates
the main contactor and the exciter(s).
Summary of Contents for Platinum Z2 CD
Page 4: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
Page 6: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
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 ...
