INSTRUCTIONAL MANUAL
2750L-P/4500L-P/6000L-P
August, 2001
Rev. K
-105-
SECTION 5
THEORY OF OPERATION
5.1 GENERAL
An explanation of the circuits within the AC Power System is given in this section. Refer to Figure 5-1 for a block
diagram of the AC Power System.
5.2 OVERALL
DESCRIPTION
Input power from the rear panel is routed through the circuit breaker to the Input Power Supply (A5). DC voltages from
the Input Power Supply are routed to the Power Mother Board (A4), the Control Mother Board (A8) and the Auxiliary
Power Supply (A7).
The Programmable Oscillator assembly (A11) generates the oscillator waveforms and power source control and
measurement signals. The oscillator assembly is connected to the rest of the power source through the Control Mother
Board, A10.
The three amplifier modules are A1, A2 and A3. They take their DC supply voltages and input signal from the Power
Mother Board, A4. They produce the high power outputs for the primary of the output transformers, T1, T2 and T3.
The outputs are routed through the Power Mother Board to the output transformers.
The Range Relay Board is identified as A6. This board assembly configures the secondaries of the output transformers
for the correct output voltage range. The outputs from the AC Power System are taken from the Range Relay Board.
This board also has relays that switches the output to the 1-phase mode and opens the outputs. There is also a circuit
on the board that senses for incorrect sense line connections.
The board assemblies are described in more detail in the following paragraphs.
5.3
INPUT POWER SUPPLY
This assembly is identified as A5. It generates the high power +300 VDC supply. This supply voltage is connected to
the filter capacitor, C1, and to the Power Mother Board. C1 is mounted on the bottom cover of the AC Power System.
The Input Power Supply also has circuits that generate the DC voltages identified as +18V, +15VSW, +8VSW and +8V.
The +18V supplies are used for the Oscillator Module and the Current Limit Board. The +8V supply is used for the
Oscillator Module. The +15VSW supplies are used for the three Amplifier Modules.
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Страница 136: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 132 Figure 10 11 ABNORMAL OPERATION...
Страница 137: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 133 Figure 12 13 ABNORMAL FREQUENCY...
Страница 138: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 134 Figure 14 EMERGENCY VOLTAGE...
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