SMC Networks 5000 manual Cushion Pressure Transducer Mounting, Cushion Air Valve System Mounting

Section 3.4.1 Cushion Pressure Transducer Mounting

The system uses a method of control in which the fill valve or dump valve is energized to raise or lower the pressure of the system. The pressure transducer tells the system when it has reached the proper pressure. Because air pressure drops occur across air lines when filling or dumping, proper placement of the pressure transducer is very important for correct operation of the system. Possible pressure transducer mounting locations from best to worst are (refer to Figure 3.11):

a)A spare port on the cushion surge tank.

b)The same port that the safety pop-off valve is mounted on if it has its own port on the surge tank.

c)Right at the outlet on the surge tank that goes to the cushion.

d)Right at the inlet on the surge tank from the Fill/Dump valves.

e)If there is no surge tank the pressure transducer should be mounted right at the inlet on the cushion.

Figure 3.11: Acceptable Locations for Mounting Cushion

Pressure Transducer.

Section 3.4.2 Cushion Air Valve System Mounting

The mounting location of the cushion air valve system is not critical. Consideration should be given, however, to ease of maintenance, plumbing, and wiring when choosing the mounting location. Also note that sometimes the check valve in the original system may be up at the surge tank itself. The check valve must be removed for the automatic system to work.

Section 3.4.3 Cushion System Wiring

Refer to Appendix B, Figure B.2, for typical wiring of the cushion valve and pressure transducer. Note that the auto-select connection is only connected if a type “C” integrated valve is used. For type “A” and “B” valves, the auto-select connection from pin 2 of the cushion module is not required. If your

April 17, 2000 Man ual Versio n 1.0 3.8