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2 • Chapter 1 Overview DMC-3425
The DMC-3425 is designed for stand-alone applications and provides non-volatile storage for
programs, variables and array elements.
This manual uses ‘DMC-3425’ to refer to the distributed control E-series from Galil. However, most
functions described in this manual are available using either the DMC-3425 or the DMC-3415. If a
function is specific to only one of the controllers, this will be explicitly stated.
Overview of Motor Types
The DMC-3425 can provide the following types of motor control:
1. Standard servo motors with +/- 10 volt command signals
2. Step motors with step and direction signals
3. Brushless servo motors with sinusoidal commutation
4. Other actuators such as hydraulics - For more information, contact Galil.
The user can configure each axis for any combination of motor types, providing maximum flexibility.
Standard Servo Motors with +/- 10 Volt Command Signal
The DMC-3425 achieves superior precision through use of a 16-bit motor command output DAC and a
sophisticated PID filter that features velocity and acceleration feedforward, an extra notch filter and
integration limits.
The controller is configured by the factory for standard servo motor operation. In this configuration,
the controller provides an analog signal (+/- 10Volt) to connect to a servo amplifier. This connection
is described in Chapter 2.
Stepper Motor with Step and Direction Signals
The DMC-3425 can control 2 stepper motors. In this mode, the controller provides two signals to
connect to each stepper motor: Step and Direction. For stepper motor operation, the controller does
not require an encoder and operates the stepper motor in an open loop. Chapter 2 describes the proper
connection and procedure for using stepper motors.
NOTE: In order to use two stepper motors on the DMC-3425, the controller must be ordered as a
DMC-3425-Stepper. In this mode, the Amp Enable and Error outputs are converted to the Step and
Direction signals for the Y-axis. Contact Galil for other stepper options.
Brushless Servo Motor with Sinusoidal Commutation
The DMC-3415 can provide sinusoidal commutation for brushless motors (BLM). In this
configuration, the controller generates two sinusoidal signals for connection with amplifiers
specifically designed for this purpose. Please note, for a 2 axis DMC-3425, converting to a brushless
motor uses up the second axis.
Note: The task of generating sinusoidal commutation may be accomplished in the brushless motor
amplifier. If the amplifier generates the sinusoidal commutation signals, only a single command signal
is required and the controller should be configured for a standard servo motor (described above).
Sinusoidal commutation in the controller can be used with linear and rotary BLMs. However, the
motor velocity should be limited such that a magnetic cycle lasts at least 6 milliseconds*. For faster
motors, please contact the factory.
The controller provides a one-time, automatic set-up procedure. The parameters determined by this
procedure can then be saved in non-volatile memory to be used whenever the system is powered on.