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FMT 3000 Hardware Reference Manual - Introduction
10Base-T connector is located inside the unit’s case for connecting the device to the network.
The input is transformer isolated and filtered.
Chapter 3, Networking, of the FMT 3000 Software Manual describes network software
support and setup.
Power Board (with or without digital I/O)
The power board (with or without digital I/O) plugs into the interboard connector located at
the far right side of the main board of the unit. This board provides conditioning and
regulation of the power source for the unit, the power on/off switch, a charger and connector
for the battery back-up option and, if installed, the optional digital I/O components. All units
are supplied with the basic power board. If the isolated digital I/O option was ordered, the
power board contains additional components for 6 opto-isolated inputs, 2 relay outputs and
a removable terminal I/O strip for wiring signals.
Power Supply Section
The power board accepts a wide range of AC voltages (18 to 28 VAC) so that a distributed
24 VAC wiring system may be employed. A range of DC voltages (9 to 30 VDC ) may be
used to power the unit through the power board as well. To protect the unit and reduce line
noise the power board employs over-voltage input protection and EMI filtering at its input.
Power is connected through a two-pin connector located on the power board. The two
standard AC power adapters available for the unit are fitted with a two-pin connector to
connect directly to the power board. Power cables can be routed through the rear cable cut-
out to the interior of the unit. If a user-supplied DC source is used, the same connector should
be used and the polarity of the power connection does not matter (the board has an internal
bridge rectifier).
The power switch extends from the board and mounts to the recessed area at the front of the
unit’s case. A red LED indicates when power is on. To prevent an operator from
inadvertently turning off the unit, the switch may be disabled by removing a jumper. If
desired, the switch can also disconnect the back-up battery (if installed) from the circuit by
removing a jumper (Refer to
Appendix A, Connectors and Jumpers
A switching regulator converts the rectified and filtered input voltage to +5 VDC for internal
use by the unit and any installed accessories. Power limitations of the supply are discussed
in