11
5.2 CW/CCW (DIRECTION) - Pin 2
A logical high causes the motor shaft to step in the clockwise di-
rection as viewed from the label end of the motor. A logical low, or
connection to LOGIC COMMON results in counterclockwise direc-
tion. With this pin left open, the motor will step in a CW direction.
5.3 PU (PULSE IN) - Pin 3
A low to high transition (positive going edge) on this pin causes
the motor to take one step in the direction selected by the CW/CCW
pin.
Normally, when the oscillator board is used for control, this pin is
connected to PULSE OUT, pin #10, by placing position 4 of switch
S1 in the “on” (closed) state.
Minimum pulse width low is 15 microseconds; minimum pulse width
high is 50 microseconds.
5.4 DO NOT USE - Pin 4
This pin is not available to the operator
5.5 DO NOT USE - Pin 5
This pin is not available to the operator
5.6 RUN - Pin 6
When connected to “Signal Common” (logic low), enables the os-
cillator.
If BASE SPEED ONLY is open (logic high) when RUN is activated,
the motor will accelerate according to the set rate, to the predeter-
mined high speed. When RUN is open (logic high), the motor will
decelerate according to the set rate until base speed is reached and
will then stop.
If BASE SPEED ONLY is activated (logic low) when RUN is acti-
vated (logic low), the motor will run at base speed until RUN is open
(logic high).
5.7 LOGIC COMMON (Vo) - Pin 7
Reference point for inputs and outputs.
5.8 HI SPEED POT 1 - Pin 8
Allows for control of high speed by means of an external 500k
ohm potentiometer, when used in conjunction with HI SPEED POT 2
(pin #15).
This is also a test point for acceleration and deceleration.
5.9 H/F (HALF/FULL) - Pin 9
When the pin H/F is connected to “SIGNAL COMMON” (logic low),
the motor operates in the
full-step mode.
An open pin (logic high) selects the half-step mode. When oper-
ated in the half-step mode the motor provides smoother motion with
finer resolution, but at approximately 30% less torque.
NOTE: When a transition from half-step to full-step operation is
made, Vm power should be removed to avoid a full-step, one
winding on operating mode.
5.10 PULSE OUT - Pin 10
Produces a pulse (square wave output) from oscillator. Connect
to “PULSE IN” by placing position 4 of switch S1 in the “on” (closed)
state if an external source is not required.
This is also a test point for monitoring base speed and high speed.
This output is an open collector output and should be connected to
PULSE IN if used for monitoring purposes.
5.11 DO NOT USE - Pin 11
This pin is not available to the operator.
5.12 SIGNAL COMMON - Pin 12
Reference point for all logic inputs and outputs.
5.13 DO NOT USE - Pin 13
This pin not available to the operator.
5.14 BASE SPEED ONLY - Pin 14
When connected to “SIGNAL COMMON,” (logic low) permits only
base speed velocity from oscillator.
Frequency Range: 0 Hz to 2500 Hz
There is no acceleration or deceleration when operating at base
speed.
If this pin is open (logic high), high speed mode is selected.
5.15 HI SPEED POT 2 - Pin 15
Allows for control of high speed by means of an external potenti-
ometer when used in conjunction with HI SPEED POT 1 (pin #8). As
an alternative to using an external potentiometer, the high speed can
be controlled by connecting an analog voltage (5 to 9 volts dc) to this
input. It will be necessary to “ramp” the analog input to control accel-
eration and deceleration of the pulse train. Position 3 of switch S1
must be “off” (open) when using analog voltage.
Note: 500k ohm (connected across pins #8 and #15) is recom-
mended when external control is required and position 3 of switch
S1 must be “off” (open).
SECTION 6: OPERATING INSTRUCTIONS
6.1 INTRODUCTION
This section outlines the procedures for adding an external high
speed potentiometer to the 230-TOH and 430-TOH modules, for
setting base speed, and for adjusting high speed, acceleration and
deceleration.
6.2 OPERATION FROM EXTERNAL OR ON BOARD
POTENTIOMETERS
1. HI SPEED POT 1 and 2 allow connections to a
remote poten-
tiometer for control of HI SPEED setting.
2. Connect a 500k ohm potentiometer between J1 pins #8 and
#15 for external control.
OR:
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