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6.1.7.1.3.

Slew Rate Limiter Speed Adjustment

Now that the small angle step response

set, the Slew Rate Limiter Speed Adjustment can

set

contiol

the

large angle response. The purpose

this adjustment

is to

keep

the

output

stage ofthe servo from saturating for the largest and fastest possible move to be performed in the

application. This is usually

full-field square wave.

**Caution!! Ensure the scanner is properly heatsinked or damage to the scanner will result.

Set up the system as in section

6.1.7.1.1.

above.

Using a square wave input, adjust the

frequency

ofthe input waveform so that the motor will

have enough time to settie at each point before the next half cycle ofthe square wave occurs.

If that is not yet known, run the system

around 30 Hz. Note: For very large inertia systems

this might be too fast, thus

slower

frequency

will have to be used.

Set the amplitude ofthe input waveform so that the scanner moves symmetrically about

1.0

volts p-p centered around 0.0 volts.

Attach

one

scope probe

Position

Out on TPl. Set the

scope channel's sensitivity

0.5V/div. Attach

second scope probe

to Fl to the

+Motor signal.

Set the

sensitivity

1 OV/div. This is the drive voltage sent to the scanner drive coil. See Figure 15.

Increase the amplitude

the input signal slowly while watching the +Motor signal

on the

scope.

CH1=PosilionOut

CH2=+Motor

CHI

SdJmtl

KI dni ' 16V'

CM J.Stns

Ext/U/

1.58 V

;

•

:CH2

•....1

CHi: 1 : :

:,:

: CH2=+Motor

^^_.

. i .

;

1 ; T

• • •

^^^ ^I^

: :

p/ : •; "i" T "T" '

sour nv >«« ai2 10V ^M 1ms Ext/10

J-

1.58

Figure 15.

Figure 16.

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 67 68

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