Nortel SONET AccessNode 800A Series - Procedure 10-2 Adjusting High Voltage Shutdown

10-12 Adjusting the rectifier and the dc distribution shelf
AccessNode 323-3001-210 Issue 1.0
Procedure 10-2 (continued)
Adjusting high voltage shutdown
Action
Step Action
1 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).
2 Set the EQL/ FLT switch on the rectifier to the FLT position.
3 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—
CAUTION
Overvoltage damage to equipment hazard
Do NOT adjust the voltage above -56.0 V dc as damage to
the AccessNode equipment may result.
Table 10-5
Verify the initial HVSD setting on the rectifier
If the event that happens while you are
adjusting the FLT potentiometer is Then perform these steps
The ac circuit breaker on the rectifier trips before
-56.0 V dc is reached
record the voltage
measurement at which the
HVSD occurred.
Go to step 4.
The voltage level reaches -56.0 V dc before the
ac circuit breaker on the rectifier trips
go to step 5.
The ac circuit breaker trips at -56.0 V dc go to Procedure 10-3.