A-23
Catalyst 4500 E-Series Switches Installation Guide
OL-13972-02
Appendix A Power Supply Specifications
1400 W Triple-Input DC-Input Power Supply
Note
In a redundant configuration with all inputs supplied, there must be a 100 W minimum system load or
the OUTPUT FAIL LED shows a false failure.
The 1400 W triple-input DC-input power supply requires a minimum draw from the system that it is
installed in.
Table A-20
shows the minimum draw for the possible modes.
Table A-19
Dual Redundant Mode Power Supply Configuration
(1400 W Max Output Power)
Input
Number
Approximate
Input Current
Approximate Input
Power @ –40.5 VDC
Approximate Input
Power @ –44 VDC
1
6.25 A @
–40.5 / –44 VDC
253 W
275 W
2
7.5 A @ –40.5 /
–44 VDC
304 W
330 W
3
7.5 A @ –40.5 /
–44 VDC
304 W
330 W
Table A-20
Minimum Load Table
PSU1
PSU2
Input 1
Input 2
Input 3
Input 1
Input 2
Input 3
12 VDC
Minimum
Load
3.3 VDC
Minimum
Load
Single Operation
Mode 1
ON
OFF
OFF
—
—
—
1.33 A
0.6 A
Mode 2
OFF
ON
OFF
—
—
—
1.33 A
0.6 A
OFF
OFF
ON
—
—
—
1.33 A
0.6 A
Mode 3
ON
ON
OFF
—
—
—
2.66 A
0.6 A
ON
OFF
ON
—
—
—
2.66 A
0.6 A
Mode 4
OFF
ON
ON
—
—
—
2.66 A
0.6 A
Mode 5
ON
ON
ON
—
—
—
4 A
0.6 A
Dual Redundant Operation
Mode 1
ON
OFF
OFF
ON
OFF
OFF
2.66 A
1.2 A
Mode 2
OFF
ON
OFF
OFF
ON
OFF
2.66 A
1.2 A
OFF
OFF
ON
OFF
OFF
ON
2.66 A
1.2 A
Mode 3
ON
ON
OFF
ON
ON
OFF
5.32 A
1.2 A
ON
OFF
ON
ON
OFF
ON
5.32 A
1.2 A
Mode 4
OFF
ON
ON
OFF
ON
ON
5.32 A
1.2 A
Mode 5
ON
ON
ON
ON
ON
ON
8 A
1.2 A
