4-44
888-2406-002
WARNING: Disconnect primary power prior to servicing.
Overall System Theory
4.7.4.4 PA Controller Faults
For a complete listing of the faults associated with the PA Controllers refer to
Section VI, Troubleshooting.
4.7.5
Power Supply Controller
There is only one PS Controller Board and one power supply in the standard Z2
transmitter. The Z2R has 2 power supplies and 2 PS Controllers. Each controller is
capable of controlling up to 2 power supplies completely independent one from
another. This allows one of the supplies to have a critical failure and be shut off
without interrupting the operation of the second supply.
The PS Controller functions include the following:
•
Control of the tap switching which is used to coarsely regulate the power supply
voltage to 52Vdc.
•
Control of the Soft-Start and PA Power Supply Discharge functions.
•
All power supply monitoring and fault detection. These include voltage, current,
temperature and status.
4.7.5.1 Power Supply Turn On
The primary function of the PS Controller is to turn the power supply on and off.
The on/off signal is called PS_DISABLE and comes in on J3-13. The signal
originates on the Master Controller but passes through a logic gate on the Life
Support Board before reaching the PS Controller. PS_DISABLE is an active high
signal which means that if the signal is high the power supply will be shut off (the
secondaries will be deactivated by shutting of the SCRs but primary voltage could
still be present). If it is low, the power supplies will be activated, unless there is a
critical fault on the PS Controller board, in which case the supplies will be shut off
regardless of the PS_DISABLE signal. The power supplies are turned on via one of
the four outputs:
•
DRIVER 1 (TAP 1 - 48V)
•
DRIVER 2 (TAP 2 - 50V)
•
DRIVER 3 (TAP 3 - 52V)
•
DRIVER 4 (TAP 4 - 54V)
These outputs are duplicated, one set for PS1 and the other for PS2. When the
transmitter is turned on the Master Controller brings the PS_DISABLE signal low
(provided the contactor has been activated and the Master Controller is operating
normally). This will first activate the SOFT_START outputs at J1-8 and J2-8. This
allows the supplies to charge slowly, limiting the in-rush current via the soft-start
resistor and SCRs on the rectifier boards. The supply voltage must reach at least
40Vdc within 3 seconds, (6 seconds for a single phase supply) otherwise the turn on
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 ...
