Cisco 3800 Series Quick Start Manual page 55
Systems routers
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Dual sources with opposite-polarity grounding damage equipment.
Caution
In
Figure
Figure 16
+
In
Figure
Figure 17
+
+
In
Figure
allowed only if Va equals Vb (within 0.25 V).
If source A and source B are wired with common positive terminals and their voltages are unequal by
Caution
more than 0.25 V, the higher-voltage source can discharge into the lower-voltage source through the
negative terminals. Excessive discharging currents through these terminals can actuate one or both of
the dual- input DC power supply's internal A– or B– fuses, resulting in lack of redundancy or system
failure. When source A and source B are within 0.25 V, discharge current is minimal.
OL-5970-02
16, either the positive source terminal or the negative source terminal is tied to ground
Connecting to One Source Only—Source A or Source B
A-
A+
B+
B-
17, source A and source B share common negative terminal connections.
Connecting Source A and Source B with Common Negative Terminals
A-
Va
A+
B+
Vb
B-
18, source A and source B share common positive terminal connections. This configuration is
A-
+
A+
B+
B-
Connecting Cables to Cisco 3800 Series Routers
Power Connections
.
25
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