RMS Technologies R101 DRIVER/INDEXER User Manual

Page 12

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RMS Technologies

Page 12

Version 1.31

R101 Single Axis Driver/Indexer Manual

10/1/2007

8. BASIC STEP AND DIRECTION OPERATION


The four control signals Step, Direction, Disable, and Zero Set are optically isolated,

with a common positive connection (usually 5 VDC).

The common positive connection (Pin 1) is typically 5 VDC. Each of the inputs is set
to TRUE by supplying a signal level 5V below the common positive connection

powering the optical isolators. The input is set FALSE by putting the signal within 0.5
VDC below the common positive value.

Example: If 5 VDC is supplied to Pin 1 (common positive connection), TRUE is 0V,
and FALSE is any value between 4.5 VDC to 5 VDC.


For test purposes, and some applications where input isolation is not required, the

internal 5 VDC supply at Pin 4 of the I/O connector can be used as the common
positive connection, by linking pins 1 and 4 on the connector.


If this is done then each input is set TRUE by bringing the voltage level at the input
equal to, or more negative than the Power Supply negative connection at Pin 11.


With this arrangement Direction, Disable, and Zero Set control can be effected by

simple switch closure between the input and the power negative connection at Pin
11.


If the Step input is obtained from a Function Generator, then careful adjustment of

the Offset control is needed to ensure that the negative level of the input signal is
equal to, or more negative than, the power negative connection at Pin 11.

The minimum duration of the active (negative) Step input signal level is 33
microseconds and also this is the minimum for the inactive (positive) level. This

limits the maximum usable step rate to 15,000 PPS.

The optimum operating arrangement (minimum power usage) is for a constant width
negative going pulse of 33 microseconds with the pulse interval varying with pulse

rate. For test purposes, setting the Function Generator duty cycle to 50%, and only
varying the frequency is satisfactory.

Using the R101 with more than 5V

You can choose to supply the optos with the R101’s internal 5V supply by jumping
pins 1 to 4. But if you choose to use more than 5V, for example, a 24V supply and

the step pulse train is also a 0 to 24V low-high signal, please use the following
recommended resistor to limit the current to 10 mAmps. Note: no resistor will be
needed on the actual opto supply line, pin 1.


Step, Direction, and Disable lines have a 680 ohm internal resistor
Voltage: 5V

10V 15V 24V

Ohms needed:

0

750

1500

2700

Wattage rating:

0

1/8 watt

¼ watt

½ watt

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