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and the desired Command Input Scale Factor =

2:1

1.0V/°

mechanical

Thus,

R30 = (Command Input Scale Factor

R29) / (Position Output Scale Factor x Slew Rate

Limiter Voltage (jain x Command Input Scale

Adjustment)

R30 = (l.OV/^ mechanical • lOKohm) / (0.5Vr mechanical x 1.074 x

0.9311)

R30 = 20Kohm (Use a high quality metal film resistor, RN55C, for best thermal drift

characteristics.)

The Command Input Range or "Fieldsize" is now determined as the product ofthe range ofthe

Command Input voltage and the Command Input scale factor. For the above example:

Command Input Range =

+/-10V

1.0V/°

mechanical

Command Input Range =

+/-10°

mechanical = 20° mechanical pk-pk

detailed procedure is included in the appendix 6.0 on how to set the Command Input Scale

Adjustment Basically,

R51

is adjusted so that the proper voltage ratio is measured from W4 to

the position output voltage measured on TPl.

3.6.5.

Command Offset

The Command Offset is used to add a small DC offset for a specific application requiring it.

Two methods are available on the 670 board. The first is an on-board adjustment pot, Rl. Rl is a

15-tum Cermet potentiometer whose output voltage ranges from -5V to +5V. Its offsetting

contribution is contiolled by

RIO.

The nominal offset contribution is +/-20% ofthe input range.

The second Command Offset input is accepted via the

4-pin

Molex

C-grid

coimector J 1.4. Use

J 1.2 for the retum. This is a high impedance input with a

+/-10V

range. Its contribution is

conti-olledbyR85.

**Note: When the extemal Command Offset input is not intended to be used, do not install R85.

If R85 has been installed, but J1.4 is not connected to a low impedance signal source, short J1.4

J1.2.

Otherwise, a large unintended offset voltage will be added to the command input.

3.6.6. Command OfTset Scale Factor Calculation

Since there are two Command Offset inputs, there are two Command Offset Input Scale Factors

to describe.

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