Aerotech BL 10-40, Hardware Manual

Page: 24 / 68

BL Installation and Configuration
2.5. Potentiometers (POTs)
Potentiometers INPUT, TACH, GAIN, and BAL (balance) are associated with the pre amplifier circuit con-
tained in the amplifier. These potentiometers are used to adjust the pre-amplifier gain when the MODE
switch is set for velocity control using an external DC tachometer or incremental encoder for velocity feed-
back.
Table 2-7: Potentiometer Functions
Potentiometer CW CCW Function
INPUT Increase Decrease This pot adjusts the DC gain of the input com-
mand present at J101 Pins 8 & 21.
TACH Increase Decrease This pot adjusts the DC gain of the tach or
encoder derived velocity feedback input present
at J101-Pin 3.
GAIN Decrease Increase This pot adjusts the AC gain of the pre-amplifier.
BAL Provides the means of canceling small DC off-
sets that may be present in the pre amplifier cir-
cuit.
This figure illustrates a portion of the pre-amplifier circuit that is accessible to the user for adjusting com-
mand signal gains.
Figure 2-3: Command Signal Adjustment of the Pre-Amplifier Circuit
14 Chapter 2 www.aerotech.com