Overview of External Amplifiers
The amplifiers should be suitable for the motor and may be linear or pulse-width-modulated. An amplifier may
have current feedback, voltage feedback or velocity feedback.
Amplifiers in Current Mode
Amplifiers in current mode should accept an analog command signal in the +/-10 volt range. The amplifier gain
should be set such that a +10V command will generate the maximum required current. For example, if the motor
peak current is 10A, the amplifier gain should be 1 A/V.
Amplifiers in Velocity Mode
For velocity mode amplifiers, a command signal of 10 volts should run the motor at the maximum required speed.
The velocity gain should be set such that an input signal of 10V runs the motor at the maximum required speed.
Stepper Motor Amplifiers
For step motors, the amplifiers should accept step and direction signals.
Overview of Galil Amplifiers and Drivers
With the DMC-40x0 Galil offers a variety of Servo Amplifiers and Stepper Drivers that are integrated into the same
enclosure as the controller. Using the Galil Amplifiers and Drivers provides a simple straightforward motion control
solution in one box.
A1 – AMP-430x0 (-D3040, -D3020)
The AMP-43040 (four-axis) and AMP-43020 (two-axis) are multi-axis brush/brushless amplifiers that are capable
of handling 500 watts of continuous power per axis. The AMP-43040/43020 Brushless drive modules are connected
to a DMC-40x0. The standard amplifier accepts DC supply voltages from 18-80 VDC.
A2 – AMP-43140 (-D3140)
The AMP-43140 contains four linear drives for operating small brush-type servo motors. The AMP-43140 requires
a ± 12–30 DC Volt input. Output power is 20 W per amplifier or 60 W total. The gain of each transconductance
linear amplifier is 0.1 A/V at 1 A maximum current. The typical current loop bandwidth is 4 kHz.
A3 – SDM-44040 (-D4040)
The SDM-44040 is a stepper driver module capable of driving up to four bipolar two-phase stepper motors. The
current is selectable with options of 0.5, 0.75, 1.0, and 1.4 Amps/Phase. The step resolution is selectable with
options of full, half, 1/4 and 1/16.
A4 – SDM-44140 (-D4140)
The SDM-44140 microstepper module drives four bipolar two-phase stepper motors with 1/64 microstep resolution
(the SDM-44140 drives two). The current is selectable with options of 0.5, 1.0, 2.0, & 3.0 Amps per axis.
Chapter 1 Overview • 3 DMC-40x0 User Manual
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