Lucent Technologies Lineage
®
2000 400A, 60Hz Ferroresonant Rectifier J85503C-3
Issue 10 July 2000
Testing 6 - 25
Special Application
Load Share (NLS)
1. Remove the controller cables or remote sense leads. Connect test
the load. Although adjustment is made off-line, special application
load share can only be used in a remote sense mode.
2. Disconnect and insulate the NLS bus leads from TB3-11 and 12 of
CM4, shown in Figure 5-6.
3. Turn the rectifier on and adjust the test load until the rectifier
output equals full load.
4. Enable load share by closing S2.7. If not already adjusted in a
previous procedure, adjust the output voltage to the desired level.
You may need to readjust the test load so that output current equals
full load again.
5. Using a DDM, measure the NLS voltage across TB1-2 (R-) and
TB3-12 (NLS) of CM4. The measured voltage should be 8Vdc±
1%. If the voltage is other than specified, adjust R20 on CM4 until
the measured voltage is 8 volts.
6. Remove the test load. Bring the rectifier on line and restore the
controller cables or remote sense leads. Readjust output voltage to
desired float voltage if necessary.
7. Reconnect NLS bus connections.
8. Repeat Steps 1 through 7 on each rectifier in the plant. Adjust
non-Lucent Technologies according to their respective manuals.
9. After all adjustments have been made, turn on all rectifiers. Total
load current should be shared in proportion to the full load rating
of the largest rectifier. You may fine tune the output of each
rectifier to reduce the overall variation in load current. (Raise or
lower the voltage in order to raise or lower the output current with
respect to other rectifiers in the plant.) If plant voltage is not at the
desired level, use the same method to fine tune output voltage and
currents at the same time.
Note: A minimum of two load-sharing rectifiers are required for
testing. Each rectifier must be adjusted according to Steps 1
through 9 above. S2.7 on CM4 must be closed.
10. Verify that load-sharing rectifiers are producing the same current ±
5% of the full load rating of the largest rectifier. If not, fine tune
according to Step 9.
11. With the rectifier load sharing, turn the Float Adj potentiometer
clockwise a few turns. The LCA LED should light and generate an
alarm on TB3-5 and TB3-6 of CM4.
12. Restore the rectifier to load sharing according to Step 9.