Galil DMC-1800, DMC-1700 user manual Using an Isolated Power Supply

For the DMC-1800 there is a separate LSCOM and INCOM for IN1-IN8, home, and limit switches for axes 1-4 and for IN9-16, home, and limit switches for axes 5-8. The jumpers are located on the DMC-1800 at JP3 and JP13, respectively.

LSCOM

Additional Limit

Switches(Dependent on

Number of Axes)

FLSX RLSX HOMEX FLSY RLSY HOMEY

INCOM

IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 ABORT

(XLATCH) (YLATCH) (ZLATCH) (WLATCH)

Figure 3-1. The Optoisolated Inputs.

Note: The DMC-1700 controllers with 5 or more axes have IN9 through IN16 also connected to INCOM. The DMC-1800 controllers have a separate INCOM (labeled INC) for IN9 through IN16.

Using an Isolated Power Supply

To take full advantage of opto-isolation, an isolated power supply should be used to provide the voltage at the input common connection. When using an isolated power supply, do not connect the ground of the isolated power to the ground of the controller. A power supply in the voltage range between 5 to 24 Volts may be applied directly (see Figure 3-2). For voltages greater than 24 Volts, a resistor, R, is needed in series with the input such that

1 mA < V supply/(R + 2.2KΩ) < 11 mA

46 • Chapter 3 Connecting Hardware DMC-1700/1800