Symmetricom TimeHub 5500 User Manual

097-55501-01 Revision M – January 2009 TimeHub 5500 User’s Guide 285
Chapter A
Making Ground and Power Connections–Expansion Shelf
Test Point Test Point Result
Battery A lead Battery B lead 0 V
Battery A lead TB1: Return A 0 V
Battery A lead TB1: Ground 0 V
Battery B lead TB2: Return B 0 V
Battery B lead TB2: Ground 0 V
5. Reconnect the
–48V battery A and battery B leads to the power terminal blocks
(TB1 and TB2)
–48V A and –48V B terminals.
6. Install the A fuse in the power source fuse panel.
7. Measure the voltage between the
–48V A and Return terminals on the TB1
terminal block. The multimeter should indicate –42V dc to –56V dc.
8. Install the B fuse in the power source fuse panel.
9. Measure the voltage between the
–48V B and Return terminals on the TB2
terminal block. The multimeter should indicate –42V dc to –56V dc.
10.Install both 3AG 10 A fuses (fuse A and fuse B) in the front of the shelf. The shelf
is now powered up.
Making Ground and Power Connections–Expansion Shelf
The Expansion shelf has redundant -48VDC power input connections labeled A and
B. Both are located in the upper-right and upper-left corners of the rear panel; the
connections are three-position terminal blocks, as shown in Figure A-3. The
connections are not the same as on the Master shelf.
Install power and ground connections using the procedure described in Making
Ground and Power Connections, on page 281.
Warning: To avoid possible damage to the shelf and to the office
power supply, connect power wiring as indicated on the rear of the
Expansion shelf. The power connections on the Expansion shelf are
not the same as on the Master shelf.

Symmetricom TimeHub 5500 Specifications

General

Brand	Symmetricom
Model	TimeHub 5500
Category	Data Loggers
Language	English