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14
C
2: I
HAPTER
NSTALLATION
Power
Connection
Redundant
Power Source
Single Power
Source
The 4051 requires a −48 VDC power source capable of supplying a 150-mA
current. All units in the chassis are powered by −48 VDC sources which are
connected to the 6 -position terminal strip, TB2, on the rear of the 1051 chassis.
The power supply should be sized for maximum current draw for the chassis.
The 1051 chassis is designed with two power buses. The A bus feeds the odd slots
and the B bus feeds the even slots. A power board is installed on TB2 which
allows the connection of two independent −48 VDC supplies operated in
redundant mode. This is the default configuration described in Redundant Power
Source below. The other powering method is described in Single Power Source.
The power board allows the
connection of two independent
−48 VDC supplies operated in
a redundant mode. All slots
are powered from the
combined input from the A
and B power supplies (the A
and B buses are in a logical
OR arrangement). If one
supply fails, the other powers
the entire chassis. An example
using a Verilink 1041 power
supply is shown in Figure 2-7.
Using a single power source is
essentially the same as the
redundant configuration with
power supply B not
operational. If the redundant
power board is not used, the A
and B buses must be connected
together as shown in
Figure 2-8.
Verilink
1041
Power
Supply
PS A
PS B
–
+
Figure 2-7
Wiring for Redundant Power Sources
Verilink
1040
–
Power
Supply
+
PS A
–
PS B
+
Figure 2-8
Wiring for a Single Power Source
1
2
3
TB2
4
5
6
Verilink
1051
Chassis
1
2
3
TB2
4
5
6
Verilink
1051
Chassis
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