Siemens 9700, Руководство по установке, Страница: 26 / 45

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Connecting I/O Expansion Boards to the 9700 Power Meter
Connections between the 9700 Power Meter and the optional I/O expansion
boards are made via 50-conductor ribbon cables to two lockable, 50-pin
headers on the 9700 Power Meter named
I/O BOARD A
and
I/O BOARD B
. The
connectors are keyed to protect against incorrect orientation.
If only one expansion board is used, it must be connected to the
I/O BOARD A
port. If you use a second expansion board, it must be connected to the
I/O
BOARD B
port.
Connecting Supply Power for I/O Expansion Boards
If a single expansion board and the supplied cable are used, power to the
board can be supplied entirely by the 9700 Power Meter and no external
power supply is necessary. An external power supply is required in many
situations; refer to the section
Connecting I/O Devices to the Expansion
Boards
on the next page for details on power requirements for analog I/O
devices.
Like the 9700 Power Meter itself, there are two power supply options for the
external I/O board: the P240 and the P24/48 option.
The P240 external power supply can be powered by 100 to 240 VAC, but will
operate correctly from 85 VAC up to 264 VAC. Applying power above 264
VAC can cause permanent damage to the power supply. The unit can also
be powered by 110 to 300 VDC. This can be with a dedicated fused feed or
the same voltage source that powers the 9700 Power Meter. Refer to the
following:
+
_
+
_
N L
External I/O Board
Red Black
P240 Power Supply
7
o 120 VAC
2
38)
An external power supply is
required if you are using
Expansion Board A with a
custom cable. See ‘Using
Custom Cables with I/O
Expansion Boards’ on
page 21.
2
38)
If possible, the same power
source should be used to
power the 9700 Power
Meter and the external I/O
board so that external I/O
devices and the meter all
react the same way if the
system is powered down.