Perma Pure Baldwin 3300 FLow Control Drawer - Manual (Page 9)

Section D: Operation 9
solenoid valve activated, the analyzer suite will be protected from blowback
pressurization.
Computer Control Mode Operation
Computer Control (CC): To enter Computer Control mode operation the Remote/Local
switch must be toggled to the left. Computer control is initiated through the 16 Position
vertical terminal block on the back panel. To activate a particular function, 5VDC is
applied to the appropriate terminal. The Remote and Local functions are identical. This
can be done in one of two ways. The first way is to take the +5 VDC from terminal 10 or
12, pass it through a set of dry contacts on a computer controlled relay, and back to the
appropriate terminal. The second way is to take +5VDC directly from the computer
control to the appropriate terminal. For this method, please note that the flow control
drawer GND on Terminal 14 and 16 must be connected to the GND on the computer
control unit, to electrically reference both systems together.
Computer Control Terminals Summary
Terminal 2 = System Calibration
Terminal 1 = Cal Gas 1
Terminal 4 = Direct Calibration Terminal 3 = Cal Gas 2
Terminal 6 = Blowback Terminal 5 = Cal Gas 3
Terminal 8 = NA Terminal 7 = Cal Gas 4
Terminal 10 = +5 VDC Terminal 9 = Cal Gas 5
Terminal 12 = +5 VDC Terminal 11 = Cal Gas 6
Terminal 14 = GND Terminal 13 = Cal Gas 7
Terminal 16 = GND Terminal 15 = Cal Gas 8
Computer Sense CS: Along with the computer control mode of operation, a computer
verification method is also incorporated into the system. A 40 pin vertical terminal block
on the back panel allows the computer to verify the actions initiated by the computer.
This is done through a set of normally open dry contacts that are associated with each
particular function.
Computer Sense Terminals Summary
FUNCTION
TERMINALS
Cal Gas Valve 1 1 & 2
Cal Gas Valve 2 3 & 4
Cal Gas Valve 3 5 & 6
Cal Gas Valve 4 7 & 8
Cal Gas Valve 5 9 & 10
Cal Gas Valve 6 11 & 12
Cal Gas Valve 7 13 & 14
Cal Gas Valve 8 15 & 16
System Calibration 17 & 18
Direct Calibration 19 & 20
Blowback* 31 & 32
Local Mode* 39 & 40
*Note: The sense contacts are normally closed when activated except for blowback