Servo Amp Module Upgrade Notice to 8XX Series This document provides information and differences on upgrading previous series of Servo Amplifier Modules to the -8XX series module.0 pages

SERVO AMPLIFIER MODULE UPGRADE NOTICE

PURPOSE AND SCOPE

The SERVO AMPLIFIER MODULE L404563-000 thru

799, manufactured by The Oilgear Company has been

discontinued and replaced with SERVO AMPLIFIER

MODULE, part number L404563-8XX series. This pub-

lication explains the user differences.

GENERAL

The balance and main gain adjustments of the SERVO

AMPLIFIER MODULE, part number L404563-8XX

series are made via two (2) pairs of hexadecimal rotary

switches, which are accessed through the front of the

module cover. The left switch of each pair is the most

significant digit, or coarse adjustment; the right switch

is the least significant digit, or fine adjustment.

The switches are hexadecimal, meaning they have 16

positions each. The positions increase in value from

"0" to "F", as the switches are rotated clockwise. When

the right switch (least significant digit) roll over from

"F' to "0" clockwise, the left switch (most significant

digit) must be incremented one clockwise increment.

When the right switch (least significant digit) rolls over

from "0" to "F" counterclockwise, the left switch (most

significant didgit) must be incremented one counter-

clockwise increment. This provides 256 different com-

binations of settings.

Example:

A. AMPLIFIER BALANCE

1. ' Set the balance switches to the hexadecimal pre-

liminary numbers 7F. This is the mid-point, or zero set-

ting of the amplifier 256 divided by 2 = 128 (7F) mid

point of +/-range.

2. If the system balance requires adjustment, increasing

the numbers from 7F equates to rotating the old style

balance potentiometer clockwise (more positive), and

decreasing the number equates to rotating the old style

balance potentiometer counterclockwise (more

negative).

3. The placement of the balance range jumpers and

pump stroke determine physical stroke increment

obtained. For each coarse or fine switch increment there

is, therefore a corresponding pump or control move-

ment (neutral response).

4. All feedback positions on pump volume commands

will use this balance setting as the minimum, home or

neutral position for referencing amplifier commands.

5. Some applications require critical, precise balance

adjustments. Many applications utilize hydraulic

valves to bypass flows or pressures resulting from

slight off sets from precise non-balance settings.

6. One-way pump applications may utilize the balance

adjustments to keep the pump from crossing to the

non-delivery side or to insure the pump is held slightly

against the minimum or neutral volume stop. Typically

against the stop LVDT voltages are in the range of 0.05

to 0.25 VDC while running.

7. Since balance adjustments determine the starting

point for stroke or volume commands, the balance may

affect final full stroke or volume positions attainable.

Telephone: (414) 327-1700 OILGEAR Reissued: June, 1996

Fax: (414) 327-0532 2300 So. 51st. Street E005

v Milwaukee, Wl USA 53219