Chapter Three: Overview
Inside the Type 146 Unit
69
Control Board
The Control board has two 9-pin Type “D” connectors (one female, one male). The female
connector is located at the top of the board. It carries the valve drive lines, and the PCS (pressure
control signal) output used for throttle valves or ratio controllers. Table 24 shows the pinout for
this connector. Table 27, page 71, shows some of the valves that interface to the 146 unit.
Control Valve (Top) Connector Pinout
Pin Number
Assignment
1
Power Ground
2
+ 15 Volts
3
Analog Set Point +
4
Analog Set Point -
5
PCS Signal
6
Valve Drive +
7
Valve Drive -
8
PCS Common (Signal Ground)
9
Chassis Ground
Table 24: Control Valve (Top) Connector Pinout
When using the Valve Drive + and - outputs (pins 6 and 7 in Table 24), the full scale valve drive
current (140 or 200 mA), and the compliance voltage (14 or 26 Volts), must be selected via the
proper pin jumpers. For the Type 146 unit, compliance voltage is the voltage needed to sustain a
given constant current throughout a range of valve types. Unless otherwise specified in your
system configuration sheet, the default jumper packs are JP3 and JP5. This default enables the
146 unit to drive a Type 148 or 248 Valve. Refer to Table 26, page 70, for a complete jumper
pack description. Refer to the following instructions to configure the 146 instrument to drive
different valves.
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