Chapter
2
Chapter 2 installation Guideline 2-
3
Power supply
Operation is guaranteed when using any power supply b1
5
and
+
2
5
V
DC
. Power ripples must be limited to 5 V peak to peak while the
immediate
voltage in all
cases must be maintained
between
+1
5
and
+
25
V
DC
. All power supply
specifications are
referenced
at
module
connector.
When modules are powered remotely,
the effects of
DC
voltage drops must be considered.
Small systems may be powered by using wall-mounted modular
power supplies. Also, when modules operate in long communication
lines (>500 feet), it is often more reliable to obtain power locally
through modular power supplies. These inexpensive units can be easily
obtained from any electronic retail stores.
The power cables should be selected according to the length of the
power lines and the number of modules connected. When implementing
a network with long cables, the use of thicker wire is more suitable due
to the limitation of DC voltage drop. Furthermore, long wires can also
cause interference with communication wires.
