User manual DHI REPLACING PPCH AND PPCH-G VALVE DRIVE BOARD PN 401875 INSTRUCTION SHEET

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Manual abstract: user guide DHI REPLACING PPCH AND PPCH-G VALVE DRIVE BOARD PN 401875 INSTRUCTION SHEET

Detailed instructions for use are in the User's Guide.

 [. . . ] Replacing PPCH and PPCH-G Valve Driver Board
P/N 401875 Instruction Sheet

INTRODUCTION
In August,  2006 the PPCH and PPCH-G valve driver board p/n 401875 was revised to replace the mechanical relays on it with a solid state circuit.  [. . . ] It is recommended that the old board be replaced with the revised board for all PPCH and PPCH-G pressure controller/calibrators in the field. 

Figure 2. Control valve module cover plate

Figure 3. Valve driver board installed

Remove the (6) 2. 5 mm socket head bolts that hold the control valve cover plate. 
Figure 1. Valve driver board

Lift off the cover plate carefully and disconnect the servo driver cable from the valve driver board. Disconnect the stepper motor and micro switch connections from the valve driver board. Remove the four 2. 5mm sockethead cap bolts that hold the valve driver board to the chassis and remove the board.  [. . . ] Access the PPCH or PPCH-G mechanical module by opening the fasteners on the rear panel and sliding out the module (see Section 5. 9 of the PPCH Operation and Maintenance Manual). 
Document 560084

060907

DH Instruments,  Inc. 
4765 East Beautiful Lane Phoenix AZ 85044-5318 USA

Tel 602. 431. 9100 Fax 602. 431. 9559 dhi@dhinstruments. com www. dhinstruments. com [. . . ]

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