Servo-Valve Module III

Schematic

Schematic available in Corel DRAW9 format and PDF.

Components

• DELTA Computer Systems VC2100 V/I Converter
• 150 mA, fast-blow, 3AG fuse (Littlefuse P/N 312.150P) (X2)
• Littelfuse low profile fuse holder (P/N 3453LS1) (X2)
• Amphenol box receptacle with 5 socket inserts (X2)
• DIN rail

Functional Description

Faceplate available in CorelDraw9 file: faceplate.cdr

This module is a voltage-to-current converter that is used to drive the servovalves on the standing apparatus.

For each channel:

Input voltage range: +/- 10V
Output current: 4 mA/V
Maximum output current: 40 mA

Each G761 servovalve contains two coils. (See above schematic.) This module drives the pair of coils in parallel.

Step Response

The typical step response of a channel to an input amplitude of ~20 V into a 25-ohm is shown below. The 10-90% risetime is ~ 430-445 us. Both channels have similar characteristics. (Test date: April 18, 2007.)

Frequency Response

The typical frequency response of a channel is shown below and was measured using an HP dynamic signal analyzer. Performacne was determined using a swept sinusoid of 5 Vpk (the maximum amplitude that the analyzer could generate) into a 25-ohm load. The result shown is for CH1. Similar results were obtained when the excitation was decreased to 500 mVpk. Similar results for CH2. Cut-off frequency ~800 Hz. (Test date: April 18, 2007.)

CAM files

The component mounting holes for the front and back faceplates may be machined on a prepared faceplate base using these Mastercam X files:

• Front faceplate (247 KB)
• Back faceplate (328 KB)

Last modified: 2007-05-14 Ross Wagner