Woodward GECO, Техническое руководство, Страница: 21 / 90

Manual 03554 GECO

Stoichiometric
Woodward 13
Chapter 3.
System Components
Circuit Board Panel Assembly
[P/N 9907-867]
The circuit board includes the
microprocessor control and all associated
electronics for power regulation, signal inputs and
filtering, controlled outputs, and communications. All
system connections are made directly to the board
through plug-in terminal strips and connectors. The
board also includes a status indicator light and a
control mode switch.
Mounting
There are four mounting holes in the circuit board.
One 6.35 mm (0.250 inch) hole is located at each corner.
Connectors
The terminal strips around the edge of the circuit board
are the connections for the analog and discrete I/O. There
are 45 terminals total, but not all of them will be used for a
typical application.
The RJ-12 modular “telephone jack” connects the hand-
held terminal to the circuit board. See the section in this
chapter titled “Hand-Held Terminal”.
The 6-pin Molex connector next to the RJ12 connector
provides a connection to a panel or remotely mounted LED
display of power, alarm, and shutdown status. See the
section in this chapter titled “LED Status Indicators”.
The “DB9F” Subminiature 9-pin D connector is the RS-232C
connector for communications with the PC Service Tool
software running on a laptop or desktop computer. A DB9
“straight-through” male-to-DB9 female RS-232C cable is
required to link the control to the computer. See the section in
this chapter titled “PC Service Tool Software”. A null modem
adapter is NOT required.
Power Indicator LED
The LED at the top of the circuit board indicates that power is
currently applied to the circuit. Terminals 33 and 34 are the connection locations
where 19.2–28.8 Vdc power is applied.
Toggle Switch
The toggle switch at the lower right corner of the circuit board
provides a means to manually switch between Open Loop and
Closed Loop control modes. When the switch handle is to the
right, it is in Closed Loop mode.