Servo-valve module II

 

Schematic

schematic available in CorelDraw10 file: svmII.cdr

circuit board diagram available in CorelDraw10 file: svmIIboard.cdr

The components used in this module are:

• LT1007 operational amplifier
• LM311P operational amplifier
• Capacitors
• Resistors
• switches (C&K 7101)
• green LEDs (Lumex part #SSI-LX312GD-150)
• BNC connectors
• Hirschmann 11+PE surface mounted connectors (Hirschmann 932 628-206)
• 3-pin Amphenol female receptacle connectors (Amphenol part #16S-5S)

Functional description

faceplate available in CorelDraw10 file: svmII faceplate.cdr

The role of the SVMII module is to send a 24 volt DC supply and the command signal to the servo-valve. The 24V supply originates from the SVMII power supply panel and is inputted to the SVMII module through the 3-pin Amphenol connector. The 24 VDC supply and ground is sent to pin 1 and 2, respectively, of the servo-valve, and also to the fail-safe solenoid valve, pin 10 and 11, respectively. The command signal from the controller is inputted to the module via the input BNC. The LT1007 operational amplifier is used to drive the long cables connecting the module to the servo-valve. The monitor BNC shows the output of the op amp. The enable/disable switch sends a signal to pin 3 of the servo-valve. If the 24VDC is being supplied to the valve and the enable switch is on, the LED will light up. If the valve is disabled it should return to its center or closed position. If the supply to the valve cut, the fail-safe solenoid will cause the valve to move to the center postion. The spool position BNC shows the actual spool position output from the valve. Pins 7 and 11 are left unconneted. The details of the 11+PE connections to the servo-valve are shown below.

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Last modified: 2003-07-24 Shauna Forster