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INSTRUCTIONAL MANUAL
2750L-P/4500L-P/6000L-P
August, 2001
Rev. K
-107-
5.4 AUXILIARY
POWER
SUPPLY
The Auxiliary Power Supply receives the +300 supply voltage from the Input Power Supply. The +300 supply voltage is
then changed to the +50 VDC supply voltage for operating the fans and relays. In addition to the +50 VDC supply,
+15VSW1 is also generated. This supply voltage is used for the gate drive signal in the Amplifier Modules.
5.5
CURRENT LIMIT BOARD
The Current Limit Board receives the oscillator signals identified as OSC A, B and C from the Oscillator Module.
Analog switches on this board direct the oscillator signals to the respective amplifier module. The analog switches
switch the OSC A signal to the three amplifier inputs during 1-phase operation. For 3-phase operation, OSC A, B and
C are switched to the amplifiers A, B and C inputs respectively. Gain adjustments are located on this board to match
the gains of the 3 Amplifier Modules.
The current limit circuits are also located on the Current Limit Board. These circuits receive a DC signal from the Oscil-
lator Module, CLA, B and C, that is proportional to the current limit value. This DC signal is compared to the output
current. The output current signal is identified as TA, TB and TC. This signal is routed to the Current Limit Board from
current transformers on the Range Relay Board. If the output current exceeds the programmed value, an attenuator
will limit the output voltage to a value that will cause the AC Power System to operate at a constant current. If the
output current limits the output voltage to 10% of the programmed voltage amplitude value, the output will default and
an AMP FAULT error message will be displayed. The error message will also be reported through the IEEE-488
(GPIB) interface.
The Current Limit Board has analog switches and summing amplifiers that are used for current measurements. The
outputs from the summing amplifiers, CT A, B and C, are routed to the Oscillator Module for measurement. In the
1-phase mode the current from all three output current transformers are summed together for measurement. This
signal is identified as CT A.
5.6 INDICATOR
BOARD
The Indicator Board has the reference designator, A12. This board has LED indicators for the HI RANGE, OVERTEMP
and OVERLOAD conditions.
A front panel selector switch is mounted on the Indicator Board. This switch is used to connect the front panel analog
meter, M1, to either the phase A, B or C output.
5.7 RANGE
RELAY
BOARD
The Range Relay Board has all of the AC Power System relays. These Relays are operated from +50 VDC. The
output relay is opened by a logic low on the CNF control line. The range relay is switched to the high voltage range by
a logic low on the
RNG HI
control line. The output is in the 1-phase mode when the PARALLEL control line is driven to
approxi10 VDC.
There are three current transformers on the Range Relay board. These transformers generate an AC voltage that is
proportional to the output current. The voltages are identified as TA, TB and TC. A 10 amp load current is represented
by a 1.00 VAC signal in the 3-phase mode.
5.8 AMPLIFIER
MODULES
The AC Power System has three Amplifier Modules. In the 3- phase mode, one amplifier is used for each of the three
outputs. In the 1-phase mode, the three outputs are paralleled at the secondaries of the output transformers.
The Amplifier Modules operate in a switch mode to obtain high efficiency. These switch mode amplifiers operate at 200
KHz.
Содержание 12000L-1P
Страница 27: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 23 Figure 2 3 FUNCTION TEST SETUP...
Страница 98: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 94 Figure 4 3 FLOW DIAGRAM A REMOTE CALIBRATION...
Страница 99: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 95 Figure 4 3 FLOW CHART continued...
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Страница 110: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 106 Figure 5 1 AC POWER SYSTEM BLOCK DIAGRAM...
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Страница 119: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 115 Figure 6 1 MODULE LOCATION...
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Страница 133: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 129 Figure 1 STEADY STATE VOLTAGE...
Страница 135: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 131 Figure 8 9 FREQUENCY TRANSIENT...
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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Страница 148: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 144 FIGURE 2...