8
Andover Controls
The power supply generates a +24 VDC source for the CPU and all other modules in
the system. This power source is located on pins 4 and 5. Pin 3 (Ground) is intended
as an Earth ground connection.
The NetController consumes a maximum of 15 Watts of 24V power.
The UPS version of the power supply (PS 120/240 AC 50-U) provides the CPU with
two power status signals on pins 1 and 2. Their function is as follows:
AC Power
is a logic signal that is intended to communicate that AC power is
available. When AC is interrupted and the power supply has switched to UPS
battery mode, this signal presents a logic low. The CPU can use this signal to
start an orderly system shutdown. For more information on the use of this signal,
refer to the section titled
UPS Programming
.
Low Battery
is a logic signal that is intended to communicate that the voltage of
the battery has dropped below 22 Volts. When the power supply has switched to
UPS battery mode, this signal presents a logic high. Should the battery voltage
drop, this signal switches to a logic low. The CPU can use this signal to start an
orderly system shutdown. For more information on the use of this signal refer to
the section titled
UPS Programming
.
Warning
Make sure that AC power is
not
applied (switch is off) to the power
supply while you are connecting the CPU module. The module could be
damaged or you could receive an electrical shock that is life-threatening.
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