General I/O; System Elements; Motor; Amplifier (Driver) - Galil Motion Control DMC-14 5 Series Manual

General I/O

The DMC-1415 and DMC-1416 provide interface circuitry for 7 TTL inputs and 3 TTL outputs. In
addition, the controller provides two 12-bit analog inputs. The general inputs can also be used for
triggering a high speed positional latch for each axis.
NOTE: In order to accommodate 2 axes on the DMC-1425, many of the general I/O features become
dedicated I/O for the second axis. The standard DMC-1425 will have 3 TTL inputs, 3 TTL outputs
and 2 analog inputs.

System Elements

As shown in Fig. 1.2, the DMC-14XX is part of a motion control system which includes amplifiers,
motors and encoders. These elements are described below.
Computer
Figure 1.2 - Elements of Servo systems

Motor

A motor converts current into torque which produces motion. Each axis of motion requires a motor
sized properly to move the load at the required speed and acceleration. (Galil's "Motion Component
Selector" software can help you with motor sizing). Contact Galil for more information.
The motor may be a step or servo motor and can be brush-type or brushless, rotary or linear. For step
motors, the controller is capable of controlling full-step, half-step, or microstep drives. An encoder is
not required when step motors are used.

Amplifier (Driver)

For each axis, the power amplifier converts a +/-10 Volt signal from the controller into current to
drive the motor. For stepper motors, the amplifier converts step and direction signals into current.
The amplifier should be sized properly to meet the power requirements of the motor. For brushless
motors, an amplifier that provides electronic commutation is required or the controller must be
configured to provide sinusoidal commutation. The amplifiers may be either pulse-width-modulated
(PWM) or linear. They may also be configured for operation with or without a tachometer. For
current amplifiers, the amplifier gain should be set such that a 10 Volt command generates the
maximum required current. For example, if the peak motor current is 10A, the amplifier gain should
be 1 A/V. For velocity mode amplifiers, 10 Volts should run the motor at the maximum speed.
For step motors, the amplifiers should accept step and direction signals.
4 Chapter 1 Overview
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DMC-141X Controller
Encoder
Power Supply
Amplifier (Driver)
Motor
DMC-14x5/6