Specifications

2-18 Reference Guide
Model No.
Running Head
Powering Up the System System Installation
Figure 2-12. Power Enhanced Chassis with Power Block in Front
2.6 Powering Up the System
After connecting the chassis to the external power sources and making the proper ground
connections, apply power to the chassis. Plug the AC power cord into the associated electrical
outlets, or turn on the external DC power supply. Then, observe the following front-panel
LEDs:
1. The green power LED is lit on the power supply faceplate. If redundant power supplies
are used, this LED is lit on both cards.
2. If AC-to-DC converters are installed, they’re green power LEDs light.
3. If ringing generators are installed, their green LEDs flicker at a rate of 20 times per
second.
If these LEDs are not lit, first verify that the external power source is providing power to the
chassis, and check the connection between that source and the chassis. Also be sure each card
is firmly seated in its chassis slot.
V
B
N
B
V
N
A
V
A
V
COM
RGR
A
V
N
A
V
N
B
V
V
B
+
-
+
+
+
-
-
-
+
-
48 VDC PSU
AC P LU G
-48VDC Return
-48VDC S uppl y
AC "thi rd wire" ground
Con n ect ion s
Power
D/C
Note: This diagram only depicts one DC
power source which would support the F1
power supply. If a redundant power
configuration is desired, then a second
power source would be applied to the
V
B
(+ & -) leads. A separate feed is not
required to the V
NB
(+ & -) leads unless
a redundant feed is preferred.