KTD-301 Programmable Stepper Pulser
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Control speed, direction and
acceleration/deceleration of one stepper
motor
Unidirectional and Bidirectional modes
Output between 0 to 50kHz
Input for two potentiometers to control
speed and acceleration/deceleration
On board buttons to set mode, speed range
and acceleration/deceleration rate.
Requires step and direction input stepper
motor driver for the stepper motor
The Ocean Controls KTD-301 Programmable Stepper Pulser with DIN Rail Mount is a small DIN Rail
mountable circuit board designed to provide step and direction signals to one stepper motor driver. The
KTD-301 provides two operation modes which you can set for unidirectional or bidirectional, providing
speed control range for either sizes by a single potentiometer. The KTD-301 provides acceleration and
deceleration rate control by a dedicated single potentiometer. The speed range is configurable and you
can choose a constant acceleration/deceleration rate as well.
Vs
Power supply positive input
COM
Power supply negative input
OPTO/PUL+ Pulse signal: This output represents
pulse signal, effective for each rising
PUL/PULedge
P+
5V supply to the potentiometers
DIR+
PM1
Signal input for speed control
potentiometer
DIR/DIR-
PM2
Signal input for
acceleration/deceleration control
potentiometer
ENA+
P-
Negative supply to the potentiometers
ENA/ENA-
Direction signal: HIGH/LOW level signal,
correlative to motor rotation direction
Enable signal: This signal is used for
enabling/disabling the driver. Always set
in LOW.
CONFIGURATION AND OPERATION
Switch 1 – Operation mode.
Turn the switch SW1 on to select bidirectional mode or turn the switch off to select unidirectional mode.
When in unidirectional mode, the motor spins in just one direction, setting the output DIR as HIGH, from
the minimum to maximum range of speed.
When in bidirectional mode, the motor can spin in either directions, from the maximum negative speed
to the maximum positive speed. The on board LED will turn on when the motor spin in the positive
direction and will turn off when sniping in negative direction.
Switch 2 – Acceleration/Deceleration rate.
When the switch SW2 is turned off, the acceleration/deceleration rate is controlled by the
potentiometer PM2 in real-time.
If the switch SW2 is turned on, the current value in the potentiometer will be saved. After save a
constant acceleration/deceleration rate, the potentiometer PM2 can be removed.
18 May 2015
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KTD-301 Programmable Stepper Pulser
Switch 3 – Maximum speed(unidirectional)/Maximum positive speed(bidirectional)
To configure maximum speed, the switch SW3 has to be turned on and the button has to be held, then
the potentiometer PM1 will allow you to set the speed from minimum speed to maximum speed. After
you choose the maximum speed, release the button and the configuration will be saved.
Switch 4 – Minimum speed(unidirectional)/Maximum negative speed(bidirectional)
To configure minimum speed, the switch SW4 has to be turned on and the button has to be held, then
the potentiometer PM1 will allow you to set the speed from minimum speed to maximum speed. After
you choose the minimum speed, release the button and the configuration will be saved.
Restore default configuration.
To restore the default settings, turn on the switches SW3 and SW4 then press the button.
Note 1: The terms positive and negative direction has been used to explain the state of the DIR+ pin,
which is set when positive as 5V and negative as 0V. Some drivers can use 5V input to spin the motor to
clockwise direction or anticlockwise direction, it depends on the manufacturer. The pin DIR/DIR- is
always set as LOW.
Note 2: The pins ENA+ and ENA- are unused on the KTD-301.
Example of application:
You want to configure the KTD-301 to spin from 10kHz in negative direction to 5kHz in positive direction,
with acceleration controlled in real-time by the potentiometer PM2 :
– Turn the switch SW1 on, selecting bidirectional mode;
– Turn the switch SW2 off, selecting non-constant acceleration/deceleration rate;
– Turn the switch SW3 on and hold the push-button to enter in the maximum positive speed
configuration process;
– Turn the potentiometer looking for the maximum positive direction, in this case 5kHz (you can
use an oscilloscope to help you if it is needed). When you find the right frequency, release the
push-button. Don't forgot turning of the switch SW3.
– Turn the switch SW4 on and hold the push-button to enter in the maximum negative speed
configuration process;
– Turn the potentiometer looking for the maximum negative direction, in this case 10kHz. When
you find the right frequency, release the push-button. Don't forget turning off the switch SW4.
SPECIFICATIONS
Parameter
Power Supply
Min.
Typ.
Max.
Unit Notes
8
30
V
-10
75
C
Output Frequency(Unidirectional)
0
50
kHz
Output Frequency(Bidirectional)
0
25
kHz In either directions
Operational Temperature
Pin Output Voltage – Low level
0
V
Pin Output Voltage – High level
5
V
Current consumption
18 May 2015
19
22
24
mA Two 10kOhms potentiometers coupled
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