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A1 - SUPPLY VOLTAGE

THE POWER SUPPLY MUST BE TURNED OFF WHEN

PLUGGING OR UNPLUGGING THE BOARD

The supply pins are:

J2-1 for Motor Supply Voltage

J2-3 for Auxiliary Voltage

J2-2,4 for Ground rail

The other supply voltages needed by the boards

are internally generated.

If an undervoltage condition is detected (Vs < 10V)

the GS-D500A is automatically disabled and a led

is activated.

The Motor Supply voltage is in the range from 12 to

100V, the Auxiliary voltage from 11 to 13V.

At power-on the Auxiliary Supply voltage must

be applied before the Motor Supply voltage,

while at power-off the Motor Supply voltage

must be removed before the Auxiliary voltage.

A2 - FULL-STEP/HALF-STEP/MICROSTEP PRO-

GRAMMING BY HARDWARE

The number of microsteps per step is field program-

mable. The digitized sine and cosine functions,

required by a microstepping control, are stored in a

Lock-Up-Table inside the GS-D500A.

Two options are provided for the proper mi-

crosteps/step rate selection.

Three switches (SW1, SW2, SW3) are available on

the front edge of the board.

The full-step/half-step/microstep mode is defined

by the following table.

SW1

SW2

SW3

MODE

OFF

ON

OFF

Half step

ON

ON

OFF

125 microsteps/step

ON

OFF

ON

25 microsteps/step

OFF

ON

ON

5 microsteps/step

ON

ON

ON

Full step

The switches are in OFF condition when the knob

is pulled versus the board edge. Invalid combina-

tions disable the board.

A2.1 - MICROSTEP PROGRAMMING BY HOST

COMPUTER

The microsteps/step rate can also be remotely

changed by using the three logic inputs available

on the J3 connecto r (pins 4,12 and 15) that cor-

responds, respectively, to SW1, SW2, SW3.

The interactionbetween logic signals and hardware

switches is shown in fig. 4.

Figure 7. Remote microstepping programming

To operate the logic pins of the J3 connector, the

three internal switches must be in the OFF state.

A3 - CURRENT REDUCTION AT REST

Phase current can be reduced when the motor is

stopped if SW6 is open.

Current reduction is operative about 1 second after

the last clock pulse.

GS-D500A