Glentek Inc. 208 Standard Street, El Segundo, California 90245, U.S.A. (310) 322-3026
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GA369 MANUAL
CHAPTER 6: START UP AND ADJUSTMENT PROCEDURE
1. It is possible, at this time, that the Digital Loop is reverse phased. An example of this would be if a positive
voltage from the velocity DAC required the motor to turn CW, however, it turned CCW instead causing the encoder
feedback signal to count up instead of down. This would cause a run away condition.
If you are out of phase as described, be sure power is OFF and reverse the motor leads at the amplifier and also the
tachometer leads. This will cause the motor to rotate in the opposite direction as it did before, properly phasing the
Digital Loop.
2. Now with the Digital Loop operating, turn the Loop Gain potentiometer, R1B, fully CW and command a small
move. Slowly increase or decrease the Signal Gain potentiometer, R12 or R13, of the amplifier until the servo is
operating as required. It should be noted here that too much Signal Gain at this point could cause instability
(oscillation).
Do not
stay in this oscillating condition long as it may result in system mechanical or electrical damage.
Be sure when all signal adjustments are made that the balance is rechecked and adjusted for zero rotation for zero
signal input.
3. It should be noted here that the GA369 are designed to operate with many different systems and if after reading
this manual you have further questions, do not hesitate to call a Glentek applications engineer.
ENGINEERING NOTE:
After all systems are aligned and functioning it is good practice to remove power from the amplifier and, using a
digital ohm-meter, measure the impedance value of the following potentiometer wiper settings with respect to signal
ground. These values may be useful for the next machine you align or for maintenance of this system at a later date.
Make these measurements on each amplifier on a multiaxis baseplate.
Record resistance measurements:
AMP 1
AMP 2
AMP 3
AMP 4
AMP 5
AMP 6
Tach. potentiometer wiper to signal
ground. (ohms):
Signal potentiometer wiper to signal
ground. (ohms):
Comp. potentiometer wiper to signal-
ground. (ohms):
Current limit potentiometer wiper to
signal ground (ohms):
Signal voltage
Tachometer voltage
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Date Taken: ____ ____ ____ Note any changes to compensation components, etc.:
