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INSTRUCTIONAL MANUAL
2750L-P/4500L-P/6000L-P
August, 2001
Rev. K
-96-
4.4 NONPERIODIC
CALIBRATION
If adjustments are required for these nonperiodic calibrations, the top cover of the AC Power System will have to be
removed. A nonperiodic calibration will only be required if a related assembly is repaired or if the performance is out of
specification.
4.4.1 OUTPUT
FREQUENCY CALIBRATION
Connect the Frequency Counter to the phase A output. Program the output to 135.0 volts and 400.0 Hz. Engage the
low-pass filter on the Frequency Counter to obtain the output frequency.
If the Frequency Counter does not indicate 400.000 ±0.004 Hz, adjust C43 for the correct frequency. Refer to Figure
4-1.
4.4.2
GAIN BALANCE ADJUSTMENT
CAUTION
The Gain Balance Adjustment should not be made unless an amplifier assembly has
been repaired. Each amplifier has been adjusted at the factory for an exact full scale
output voltage (135, 67.5, 156 or 200 volts for standard, LV, HV or EHV voltage
ranges) with a 5.000 VRMS amplifier input voltage. The amplifier input voltage may
be checked at TP4, TP5 and TP6 on the Current Limit Board for Phase A, B and C
amplifiers respectively. TP1 is the reference test point.
The following adjustment is for all power system models except the 2750L-3P, 4500L-3P and 6000L-3P. The 2750L-
3P, 4500L-3P and 6000L-3P do not require a gain balance adjustment. Before performing the adjustment, the top
cover of each power source must be removed.
4.4.3 GAIN
BALANCE
FOR
PARALLEL AMPLIFIERS
If applicable, program the output to the 1-phase mode. The following table shows the test point that will be used to
measure the circulating current between the amplifiers under a no-load condition. Jumper W2 on the Current Limit
Board must be installed for 4500L-1, 6000L-1, 9000L-1, 12000L-1, 13500L-1, 18000L-1 and 18000L-3.
AMPLIFIER
CURRENT
LIMIT BOARD TEST POINT (TP1 is ground)
A
TP10
B
TP2
C
TP3
Program 100 VAC. Measure the current from the B and C amplifier by measuring the voltage at TP2 and TP3
respectively. Adjust the amplifier GAIN adjustment (R104) on the respective amplifier for the lowest voltage (current) at
the respective test point. Use test point TP2 for making the gain adjustment (R104) for amplifier B. Use TP3 for
amplifier C.
For all slave power sources adjust the amplifier GAIN adjustments for the A, B and C amplifier. Use TP10 for amplifier
A.
1.
Check all of the amplifiers for the system being tested.
For the output from each amplifier of a given phase, the AC DVM should display less that 0.25 VAC
while the DVM is on the 200 VAC range.
2.
If any measurement from the GAIN BALANCE check is out of specification, the gain of the amplifier
Содержание 12000L-1P
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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...