Utah-94-721002-System-Manual.pdf - 第285页

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Incorrect link settings can cause the AMU to malfunction. The factory default settings are

given in the following table:

Link

Air

spaced

Capacitor

Low Power

Vacuum

Capacitor

High Power

Vacuum

Capacitor

Notes

LK1

A A A Setting A enables park position.

Setting B disables park.

LK2

B A B Coarse gain setting for C2 (‘A’ – low, ‘B’ –

medium, ‘c’ - high)

LK3

A A A Setting ‘B’ simulates RF on signal (for

testing only).

LK4

B A A Incremental Gain Signal. LK4 in position

‘A’ enables extra gain when in position

control. This is used when driving a

vacuum capacitor.

LK5

A A A Panel/PLC Controller. Position B for AMU

controlled by PLC

LK6

A A B Changes the biasing on the input

amplifier for C2 motor

LK7

B B A Changes the biasing on the input

amplifier for C2 motor

LK101

A A A Setting ‘A’ enables park position.

Setting ‘B’ disables park.

LK102

B A B Coarse gain setting for C1 (‘A’ – low, ‘B’ –

medium, ‘C’ - high)

LK104

B A A Incremental Gain Signal. LK104 in position

‘A’ enables extra gain when in position

control. This is used when driving a

vacuum capacitor.

LK105

A A A Panel/PLC Controller. Position ‘B’ for AMU

controlled by PLC

LK106

A A B Changes the biasing on the input

amplifier for C1 motor

LK107

A A B Changes the biasing on the input

amplifier for C1 motor

OIPT Automatch Unit

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System Manual lñÑçêÇ=fåëíêìãÉåíë=mä~ëã~=qÉÅÜåçäçÖó== ^ää=lfmq=póëíÉãë

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This may be necessary to match a process beyond the normal operating range.

WARNING

HAZARDOUS RF VOLTAGE - CONTACT CAN CAUSE DEATH, SEVERE INJURY

OR BURNS

Any work requiring the removal of covers or panels must only be

performed by authorised personnel who are aware of the hazards

involved.

Turn off the RF generator completely before removing the smaller L-section cover. This

reveals the ends of the two variable capacitors and mounting positions for extra fixed

capacitors.

CAUTION

Components fitted must be suitable for RF power service. Low power circuit

devices will overheat quickly.

Suitable components are given in the following table:

OIPT Part Number Capacitance Rating

94-ECC1209 90pf 1kV

94-ECC1218 180pF 2kV

Change components according to the following table:

C1 going maximum

Add fixed capacitance in parallel with C1

See following NOTE.

C1 going minimum

Remove fixed capacitance in parallel with C1 Minimum is zero

C2 going maximum

1. Add fixed capacitance in parallel with C2

2. Increase coil inductance

See following NOTE.

C2 going minimum 1. Remove fixed capacitance in parallel

with C2

2. Decrease coil inductance

Minimum is zero fixed capacitance

NOTE: Variable capacitors C1 and C2 have a maximum capacitance of 1000pF and 500pF respectively.

For each of these variable capacitors there are three positions for fitting parallel ‘padding’

capacitors. Therefore, a maximum of 3 x 180pF padding capacitors could be fitted but usually

there is no need to fit more than one padding capacitor (i.e. 180pF).

OIPT Automatch Unit

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The capacitors drive automatically to the park positions if:

the AMU is set to Auto

the RF is off

the circuit board links enable parking

The park positions can be adjusted when all of these conditions are satisfied, by altering the

corresponding potentiometer with a small flat-bladed screwdriver. The capacitor will move

when the potentiometer is adjusted, and the park position is displayed as the capacitor

position.

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instruments.com.sg

OIPT Automatch Unit

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