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10-12 Adjusting the rectifier and the dc distribution shelf
Procedure 10-2 (continued)
Adjusting high voltage shutdown
Action
Step
1
2
3
Table 10-5
Verify the initial HVSD setting on the rectifier
If the event that happens while you are
adjusting the FLT potentiometer is
The ac circuit breaker on the rectifier trips before
-56.0 V dc is reached
The voltage level reaches -56.0 V dc before the
ac circuit breaker on the rectifier trips
The ac circuit breaker trips at -56.0 V dc
AccessNode 323-3001-210 Issue 1.0
Action
Insert the test leads of the digital voltmeter (DVM) into the test points
(negative to negative, positive to positive) on the rectifier.
Note: On the faceplate of the rectifier module are test points labeled outputs
V+ and V- (see Figure 10-4 on page 10-10).
Set the EQL/ FLT switch on the rectifier to the FLT position.
CAUTION
Overvoltage damage to equipment hazard
Do NOT adjust the voltage above -56.0 V dc as damage to
the AccessNode equipment may result.
Slowly adjust the FLT potentiometer clockwise until one of the three events
shown in Table 10-5 occurs.
Note: Nortel Networks recommends setting the HVSD level at -56.0 ± 0.1 V
dc. See Table 10-4 on page 10-11. If the -56.0 V level cannot be reached, hold
the FLOAT/EQL switch in the EQL position while adjusting the FLT
potentiometer.
Note: If the shutdown occurs before -56.0 V dc is reached, the RFA LED
illuminates red.
—continued—
Then perform these steps
record the voltage
measurement at which the
HVSD occurred.
Go to step 4.
go to step 5.
go to Procedure 10-3.
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