Galil DMC-2X00 user manual

External Resistor Needed for
Voltages > +24V	LSCOM

2.2K

FLSA

Configuration to source current at LSCOM terminal and sink

switch

External Resistor Needed for
Voltages > +24V	LSCOM

2.2K

FLSA

Configuration to sink current at LSCOM terminal and source

switch

Figure 3-2. Connecting a single Limit or Home Switch to an Isolated Supply. This diagram only shows the connection for the forward limit switch of the X axis.

NOTE: As stated in Chapter 2, the wiring is simplified when using a Galil Interconnect module, such as the ICM-1900 or ICM-2900. These boards accept the cables of the DMC-2x00 and provide terminals for easy access (Refer to figure 2-2).

Bypassing the Opto-Isolation:

If no isolation is needed, the internal 5 volt supply may be used to power the switches. This can be done by connecting a jumper between the pins LSCOM or INCOM and 5V, labeled JP3 on the main board. The Galil interconnect modules provide jumpers and the DMC-2x00 also provides a jumper for making this connection.

Analog Inputs

The DMC-2x00 has eight analog inputs configured for the range between -10V and 10V. The inputs are decoded by a 12-bit A/D decoder giving a voltage resolution of approximately .005V. A 16-bit ADC is available as an option. The impedance of these inputs is 10 KΩ. The analog inputs are specified as AN[x] where x is a number 1 thru 8.

Amplifier Interface

The DMC-2x00 command voltage ranges between +/-10V. This signal, along with GND, provides the input to the motor amplifiers. The amplifiers must be sized to drive the motors and load. For best performance, the amplifiers should be configured for a torque (current) mode of operation with no additional compensation. The gain should be set such that a 10 volt input results in the maximum required current.

The DMC-2x00 also provides an amplifier enable signal, AMPEN. This signal changes under the following conditions: the motor-off command, MO, is given, the watchdog timer activates, or the OE1

DMC-2X00 Chapter 3 Connecting Hardware y 43