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10-2 MBP routine maintenance
Procedure 10-1
Checking and adjusting rectifier voltages
Check rectifier voltage settings in the modular business package (MBP) master
cabinet every 6 months.
Documentation references
Equipment Installation Operation and Maintenance for MPR25/MPR15
Series Single Phase -48 V, 25 A Switch Mode Rectifier NT5C06,
169-2071-500
Test sets
Fluke 8050A rms voltmeter (or equivalent)
Tools required
Slotted screwdriver (small, 0.1 in. blade)
Table 10-1 shows the Nortel Networks recommended rectifier settings for a
number of battery types. These settings are referenced throughout the
procedure.
Table 10-1
Rectifier adjustment settings
Battery
manufacturer
Johnson Control
Action
Step
1
AccessNode P0904244 Issue 1.0
High-voltage
shutdown (HVSD)
–56.0 ± 0.1
Action
To gain access to the MPR25 rectifiers housed in the MBP master cabinet,
remove the equipment covers as shown in Chapter 3, "Removing covers and
grilles."
—continued—
Equalize
Float
(EQL)
(FLT)
–55.0 ± 0.1
–54.5 ± 0.1
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