Lucent Technologies Lineage
®
2000 400A, 60Hz Ferroresonant Rectifier J85503C-3
6 - 24 Testing
Issue 10 July 2000
Enable and
Test Load
Share
After adjusting the rectifiers to float voltage, enable the load share
feature.
1. Make sure that each rectifier is carrying some load current,
between 5% and 95% of full load.
2. Move S1.9 on CM2 right to the 1 (on) position on each
load-sharing rectifier. Each rectifier should load share to within 20
amperes.
Note: A minimum of two load-sharing rectifiers are required for
testing. Each rectifier must be supplying 10 to 90 percent of the
plant load. S1.9 on CM2 must be in the on position and the
rectifiers must be connected for load sharing. Test at any
convenient current between 10 and 90 percent of the rectifier
capacity.
3. Verify that load-sharing rectifiers are producing the same current ±
20 amperes.
4. Simulate a blown F1 fuse (FS1 socket) on the CM2 control board.
The LSF LED on the control panel should light and a load share
alarm should be generated on TB3-9 and TB3-10 of CM4.
5. Remove the simulated failure. If the rectifier is providing a load
greater than 12 amperes, the LCA LED should go off.
6. With the rectifier load sharing, turn the Float Adj potentiometer
fully counterclockwise. The LCA LED should light and generate
an alarm on TB3-5 and TB3-6 of CM4.
7. Restore the rectifier voltage.