Aerotech BAL LINEAR AMPLIFIER SERIES, User Manual

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BA Linear Series User’s Manual Introduction
Version 1.5
Aerotech, Inc.
1-7
1.4.3. Potentiometers (POTs)
Potentiometers INPUT, TACH, GAIN, and BALance are associated with the
pre-amplifier circuit contained in the amplifier. Refer to Figure 1-3 for location of the
pots on the BAL drive. 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 feedback. Refer to Table 1-3 for pot functions.
Table 1-3. Potentiometer Functions
Potentiometer CW CCW Function
GAIN decrease increase
This pot adjusts the AC gain of the pre-
amplifier.
INPUT
increase decrease
This pot adjusts the DC gain of the input
command present at J6 Pins 8 & 21.
TACH
increase decrease
This pot adjusts the DC gain of the tach or
encoder derived velocity feedback input
present at J6-Pin 3.
BALance
Provides the means of canceling small DC
offsets that may be present in the
pre-amplifier circuit.
1.4.4. Connector J6 and Enable Indicator
Connector J6 (25-pin “D” type, female) provides the interface for input and output
control connections. Refer to Table 1-4 for connector J6 pinouts. The LED ENABLE
indicator will illuminate at all times until there is a fault or external shutdown, then the
indicator will be off and motor power will be removed. Refer to Figure 1-3 for location
of these items.