Lucent Technologies Lineage
®
2000 400A, 60Hz Ferroresonant Rectifier J85503C-3
6 - 16 Testing
Issue 10 July 2000
Rectifier Failure
Alarm/Fuse Alarm
Test
Note: This procedure causes the rectifier to fail and issue alarms to the
plant controller. When the procedure is performed on line, sufficient
rectifiers must be operating to assume the load of the rectifier being
tested.
1. Holding the insulation on a piece of bare wire or the end of a paper
clip, insert the wire into the fuse holder F1 on the CM1 fuse
board. Note that the rectifier shuts down and the RFA and FA
lamps on the control panel light.
2. Turn the Power switch Off, then back On. The RFA and FA
lamps should go off.
3. Repeat Steps 1 and 2 at the F2 and F3 fuses on CM1.
Current Limit Test
1. Read and comply with the following before testing:
• Adjust the current limit only after verifying that a current limit
circuit problem exists.
• There must be two or more rectifiers with a plant load of at
least 25 percent higher than the capacity of the largest rectifier.
• This method applies to a working plant. If the conditions in the
following note cannot be met, the unit must be tested off line.
• In a working plant, the current limit set point can be found by
adjusting the Float Adj potentiometer on the rectifier under test
to obtain approximately 3/4 load and a battery voltage of 52.08
volts.
• Verify that the load share feature is disabled, S1.9 on CM2 set
to 0 (off).
2. Connect a DDM to the Plant test jacks to verify the battery
voltage.
3. Hold the Rect Test switch in the full load (FL) position to raise
the rectifier output current to current limit. The output current
should indicate 400-404A, 100 to 101 percent of the rated output
current.
4. If the output current is not within 400 to 404 amperes, the current
limit needs adjustment. See Section 7.
5. Restore load share.
