Axis 670 Manual de instrucciones descargar pdf (Pagina 31)

8. Measure the distance

from

P2 to P3. Call this distance L2.

9. The Position Output Scale Factor, POSF, is obtained with the following formula:

POSF = (VP2 - VPl) / ((arctangent(L2 / Ll / 2)) / 2)

10.

Use R13 to set the POSF to

0.500

volts/° mechanical. Setting it to anything else can damage

the scanner.

11.

Ensure that the ACJC voltage on TP7 does not exceed +11V. If it does, the AGC amplifier

may saturate as the scanner ages or temperatures change. The scanner would still operate, but

at a profound decrease in positioning stability. If

the

desired position signal gain cannot be

obtained without exceeding +1IV, seek technical assistance from Cambridge Technology.

12.

Again it is recommended that after this procedure has been performed, perform "Closing the

Loop"

in section 6.1.6., then retum to

6.1.5.1.

for a more accurate setting ofthe Position

Output Scale Factor and Linearity Adjustment.

13.

Tum off the power.

14.

Disconnect TP4

from

ground.

6.1.6. Command Input Scale Adjustment

Trim-pot

R51

allows for fine contiol ofthe Command Input Scale Factor. How this affects the

overall Command Input Scale Factor is described more thoroughly in sections 3.6.3. and 3.6.5.

above.

This procedure describes how to set the voltage gain from the output of the slew rate limiter,

U1A.1 with respect to the input at W4. We refer to this ratio as the Slew Rate Limiter Voltage

Ciain. This gain is almost always set to 1:1. However, R51 can be used to vary this gain from

1.07:1

0.82:1.

R51 and R82 can be replaced to extend the range of this adjustment. However, do not let the

minimum series resistance from the input of

R51

to groimd be less than 2 Kohms. Use a high

quality potentiometer or excessive drift and/or noise will result.

Setup the system by following steps

- 7 in section 4.2.

Open the servo loop by connecting TP4 to ground

Apply power to the system.

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