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 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 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 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

B. AMPLIFIER MAIN GAIN 1. Set the main gain switch to hexadecimal prelimi- 2. If gain is too low (slow response), increase left switch until response is satisfactory (equates to clockwise rotation on the old style amplifier). 3. If gain is too high (overshoot or oscillation oc- curs), decrease left switch until overshoot or oscillation stops (equates to counterclockwise rotation on old style amplifier). 4. Use the right switch for fine or critical adjust- Coarse adjustment (Most Significant Fine adjustment (Least Significant 5. Oscillation may be observed as a vibration of the cylinder, of the...