Galil DMC-3425 user manual Step C. Connect the encoders

A signal breakout board of some type is strongly recommended. If you are using a breakout board from a third party, consult the documentation for that board to insure proper system connection.

If you are using the ICM-1460 or AMP-1460 with the DMC-3425, connect the 37-pin cable between the controller and interconnect module.

Here are the first steps for connecting a motion control system:

Step A. Connect the motor to the amplifier with no connection to the controller. Consult the amplifier documentation for instructions regarding proper connections. Connect and turn on the amplifier power supply. If the amplifiers are operating properly, the motor should stand still even when the amplifiers are powered up.

Step B. Connect the amplifier enable signal. Before making any connections from the amplifier to the controller, you need to verify that the ground level of the amplifier is either floating or at the same potential as earth.

Note: If you are using a DMC-3425-Stepper, the amplifier enable signal is used for the second stepper output.

WARNING: When the amplifier ground is not isolated from the power line or when it has a different potential than that of the computer ground, serious damage may result to the computer controller and amplifier.

If you are not sure about the potential of the ground levels, connect the two ground signals (amplifier ground and earth) by a 10 kΩ resistor and measure the voltage across the resistor. Only if the voltage is zero, proceed to connect the two ground signals directly.

The amplifier enable signal is used by the controller to disable the motor. This signal is labeled AMPEN on the ICM-1460 and should be connected to the enable signal on the amplifier. Note that many amplifiers designate this signal as the INHIBIT signal. Use the command, MO, to disable the motor amplifiers - check to insure that the motor amplifiers have been disabled (often this is indicated by an LED on the amplifier).

This signal changes under the following conditions: the watchdog timer activates, the motor-off command, MO, is given, or the OE1 command (Enable Off-On-Error) is given and the position error exceeds the error limit. As shown in Figure 3.1, AEN can be used to disable the amplifier for these conditions.

The standard configuration of the AEN signal is TTL active high. In other words, the AEN signal will be high when the controller expects the amplifier to be enabled. The polarity and the amplitude can be changed if you are using the ICM-1460 interface board. To change the polarity from active high (5 volts = enable, zero volts

=disable) to active low (zero volts = enable, 5 volts = disable), replace the 7407 IC with a 7406. Note that many amplifiers designate the enable input as ‘inhibit’.

To change the voltage level of the AEN signal, note the state of the JP1 jumper on the ICM-1460. When the jumper is placed across 5V and AEN, the output voltage is 0-5V. To change to 12 volts, pull the jumper and rotate it so that +12V is connected to AEN. If you remove the jumper, the output signal is an open collector, allowing the user to connect an external supply with voltages up to 24V.

Step C. Connect the encoders

For stepper motor operation, an encoder is optional.

For servo motor operation, if you have a preferred definition of the forward and reverse directions, make sure that the encoder wiring is consistent with that definition.

18 • Chapter 2 Getting Started DMC-3425