GLENTEK Inc. 208 Standard Street, El Segundo, California 90245, U.S.A. (310) 322-3026
14
GA45-71PR2/76PR2/81PR2/82PR2 MANUAL
R18
Loop-Gain
potentiometer is used to reduce the velocity-loop gain to zero when the system is first turned on to
prevent run away operation. Before turning the system on for the first time, this potentiometer is set fully CCW
to command zero current to the motor. Once the system is correctly phased this potentiometer is set fully CW
for all further system adjustments.
CURRENT MODE:
(Refer to Appendix C, drawings 4597-5110 and 4597-5112)
R14
Signal-Gain
potentiometer sets the input voltage to output current required by your system for the single-
ended input (e.g. S volt input = 20 amp output current).
R15
Auxiliary Signal-Gain
potentiometer sets the input voltage to output RPM required by your system for the dif-
ferential signal input (e.g. 5 volts input = 20 amps current).
R16
Current-Limit
potentiometer sets the maximum acceleration and deceleration current.
R17
Loop-Gain
potentiometer is factory set to prevent amplifier maximum rated current from being exceeded
when the current-limit potentiometer is fully CW.
R21
Balance
potentiometer is used to null out any DC offset in the amplifier (e.g. 0 volts input = 0 current output)
3.2.2 INPUT AND OUTPUT SIGNALS:
Pin No.
1. SIGNAL: Single-ended signal input.
2. +15 VDC: +15 VDC power.
3. -15 VDC: -15 VDC power.
4. COMMON: ± 15 VDC and signal common.
5. AUXILIARY: +
differential signal input.
6. AUXILIARY RETURN: - differential signal input.
7. OUTPUT: Velocity-error or current-command
8. CLAMP: Reduces gain of the summing amplifier.
9. TACHOMETER: Tachometer signal input.
3.3 REMOVAL AND INSTALLATION:
When removing or installing the Personality Preamp card,
care must be taken not to damage any of the
components
under the card on the Amplifier Controller board or on the Personality card.
Removal:
Hold the Personality card by its edges and pull straight away from the Amplifier Controller board
(Do
not pull on the components).
Installation:
Hold the Personality card by its edges and carefully align the nine pins with their mating sockets
and push straight toward the amplifier controller board until it is firmly seated
(Do not press on any of the
components).
3.4 TROUBLE SHOOTING WITH THE PERSONALITY CARD:
If your system exhibits a problem and a working amplifier module is available, fault tracing can be expe-
dited by removing the Personality Preamp card from the malfunctioning amplifier, plugging it into the replace-
ment amplifier, and testing the system. If the system does not work with the new amplifier module, refer to
Chapter Seven on Maintenance and Repair for a more detailed fault tracing procedure. However, If the system
does work with the new amplifier module, check the malfunctioning unit for loose connections and retest the
suspected unit in the system to verify the malfunction.
