INSTRUCTIONAL MANUAL
2750L-P/4500L-P/6000L-P
August, 2001
Rev. K
-97-
with the AC DVM input LO test lead connected must first be checked.
To check the gain of the amplifier, connect the AC DVM between the Output Neutral and Output High
of the corresponding output. Connect an additional AC DVM HI input test point of the Current Limit
Board indicated below. Connect the LO input to TP1.
OUTPUT TEST
POINT
ADJUSTMENT
A
TP4
R105
PHASE
A
AMP
B
TP5
R105
PHASE
B
AMP
C
TP6
R105
PHASE
C
AMP
3.
Program the output to 135.0 or the maximum voltage allowed on the corresponding Voltage Range.
4.
With exactly 135.0 volts, or the maximum voltage allowed on the range, the Current Limit test point
must be 5.000 ±1mV.
5.
Adjust R105 so that the voltage at the test point is 5.000 volts or = Vout(5/Vmax) if Vmax is not 135
volts.
6.
Repeat step 1) and adjust R105 of the amplifier for the respective output so that the output balance
voltage is at a minimum.
7.
Remove the input power and reinstall jumper W2 on the Current Limit Board in all power sources.
8.
Reconnect the outputs as shown in Figures 2-2 and 2-3.
4.4.4 CURRENT
TRANSFORMER ADJUSTMENT
The following adjustments must be made with jumper W2, on the Current Limit Assembly, removed. If the output of any
power source is connected to the output of any other power source (ex. 9000L/2-1, 9000L/2-3, 13500L/3-1, 27000L/6-
3, 27000L/6-1), remove the connection.
The External Sense input to the Master power source must remain connected.
For the following adjustments a load resistor must be connected to each output of every power source in the system.
The load resistor must be capable of loading an amplifier to approximately 9 amps (4 amps for the 2750L). Only one
amplifier at a time needs to be loaded.
1.
Monitor the phase A output current with the Current Transformer and AC DVM. Measure the phase A
voltage between TP10 and TP1 on the Current Limit Assembly.
2.
Turn on the AC input to the AC Power System. Program 60 Hz and an output voltage that generates
an output circuit of approximately 9 amps (4 amps for the 2750L).
3.
Apply the resistive load to the output. Adjust R4 on the Range Relay assembly for the correct voltage
at TP10 for the load current: (1 volt = 10 Amps). Remove the load before loading the next output to
be calibrated.
3.
Repeat steps 1 through 3 for A, B and C outputs of all power sources. Refer to the following table for
the adjustments and test points.
CURRENT TRANSFORMER ADJUSTMENTS
Summary of Contents for 12000L-1P
Page 119: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 115 Figure 6 1 MODULE LOCATION...
Page 138: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 134 Figure 14 EMERGENCY VOLTAGE...
Page 148: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 144 FIGURE 2...