Pressure Systems 98RK, 9816 user manual Valve Manifold Position Detector Circuit

Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©

(4)Place the new PC-299 board in the top and bottom rack rails so that its P-2 connector aligns with the rear panel cutout. Slide the board forward until it aligns with the top and bottom Allen-head set screws. Install the four (4) Allen-head screws, securing the back panels to the top and bottom rails. Re-attach the wiring harnesses to pins P3, P5, P12, and P13 on the PC-299 board. Ensure proper Pin 1 orientation when installing the ribbon cables. (Pin 1 of the ribbon cable has a red stripe).

(5)Ensure that all wiring harnesses are firmly connected to the PC-299 board and that the harness from the PC-206 board is fitted through the slot under the transducer/cal-valve housing.

(6)Test your scanner to ensure proper operation.

5.1.3.3Valve Manifold Position Detector Circuit

All Model 9816 Intelligent Pressure Scanners are equipped with the purge/leak-charge calibration manifold. Through software commands to each 9816, this valve may be placed in one of four positions; RUN, CAL, PURGE, or LEAK. See Section 2.2.4 for the pneumatic input requirements for these operating positions.

In earlier versions of the Model 9816, the manifold valve position detector was comprised of a small printed circuit board (PC-300) mounted on the underneath side of the calibration (cal) valve assembly. The printed circuit board (PCB) used two (2) reflective infrared sensors to sense the actual position of the manifold valve block was connected to P12 of the PC-299 board.

Should replacement of the PC-300 be required, the scanner must be returned to the factory where a new manifold assembly will be fitted. To replace the manifold position detector circuit:

(1)Use the tools and follow the general warnings already described in Section 5.1.1

(2)Place the scanner calibration valve in the PURGE position. Disassemble the module as described in Section 5.1.2. When the scanner is removed from the chassis, turn it over so that the calibration valve assembly tubing plate is facing up. The micro-switches should both be closed (actuated by the dowel pins attached to the slide valve).

(3)Unplug the manifold position detector four-pin connector from P-12 on the PC-299 board. Take note of the connector orientation. Remember that all PCBs are sensitive to static discharge.

(4)Remove the four (4) mounting screws (two from each switch) that attach the micro- switches to the manifold assembly, noting the location of each switch.

(5)Attach the new micro-switches, ensuring that the actuator arm engages the actuator dowel pin. Adjust the dowel pin gently if it does not fully engage the switch.

(6)Return the scanner to its upright position, reassemble the scanner, replace the side panel(s), reinstall the scanner into the rack, and test your scanner to ensure proper operation.

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