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SC1 Variable Speed Control Data Sheet
This card lets you control your
spindle with step and direction signals, as if it was an axis motor. It
converts the step signal into and an analogue (0-10VDC), which is what most
Variable Frequency Drives (VFD) use for external control. This card also has a
relay that lets you use the direction signal to direct the 24VDC signal from
your VFD to the appropriate input signal of your VFD to drive CW or CCW.
A Variable Frequency Drive or Inverter works by
modifying the frequency for AC motors. You
can control most of these devices with an external analogue signal (0-10VDC).
That is, if there is 5VDC coming into through the control signal, the
motor will run at 50% of full speed, if there
was 10VDC, the motor will run at 100% of full speed. If there is no signal
coming out, then the motor will stop.
This unit can also be used on many DC motor
controllers by replacing the potentiometer that controls the speed.
Inputs a frequency
(step) and outputs an analog 0-10VDC.
Uses the direction
signal to tel you VFD to go CW or CCW.
The board comes with an on-board electromechanical
relay that can be used for spindle direction control. This relay can also be used to turn on or off you
The analog and CW and CWW
signals are optically isolated, so this board can be used with drives that
make grounds common with the mains that drive the VFD or motor.
Al TTL +5VDC or
Interface directly with parallel
port interface products and other cards. 5VDC (TTL) signals are very common
among automation devices.
for all terminals.
You only have to screw-on the
wires to make all your connections
It works with other Rhonmac-cnc products, directly through
your parallel port, or through many other parallel port control products.
It requires a +12VDC power
supply to operate.
To keep the output signals optoisolated, these must
not have common ground or current with other circuits you are using.
You will require a voltmeter to
fine tune your system.
Before connecting anything, please be sure to read
your VFD’s manual and make sure you
understand all the safety issues.
Please note the wiring diagram
RJ45 connector is for connecting the boards directly using a standard RJ45
cable. A standard RJ45 cable has straight
through wiring. That means that Pin1 = Pin1, etc
This Connector is been provided in many of our
boards and soon we will have breakout boards that will come with this
connectors. This is to ease the installation process by eliminating the screw
on terminals. The RJ45 connectors are used not just to carry the I/O signals,
but also to power the external board. That way you will have it all in one
Pin 4 carries the step signal and pin 5 carries the
2 +5Vdc, 3 NC1, 4 NC2, 5 NC3, 6 NC4, 7 NC5 and 8 Ground
Configuring your Control Software: It is strongly recommend you read your control software’s manual. You need to configure your control software to control the spindle as if it was an angular axis. This card requires a 25 KHz input signal to deliver 10VDC. So you have to set the speed of the motor (spindle) at maximum. For acceleration values adjust them to where you feel comfortable. Keep in mind the acceleration of the motor must also be set in your VFD. For configuring Mach follow these steps:
Go to Config / Ports & Pins / Motor Outputs.
Enable the spindle and select the port and pins you wired for step and
2. Go to Config / Ports&Pins
/ Spindle Setup. In the motor control box, check Use Spindle Motor Output and
Step /Dir Motor. Under Pulley Ratios set the pulley ratios of the machine.
Make sure that when you reach the max speed in the
control software you get 10VDC out. This
voltage can vary depending on many things, including the electrical
properties of parallel port or breakout board you are using, the length of the
step pulse your software is delivering, and
the normal hi or low status of your step pin. Play with the fine tuning pot in the card, the normally hi or low
status of your pin, and the pulse width.
This circuit can be used to
replace a potentiometer of DC motor speed
control circuits. This speed controller circuits are very commonly used
by SIEG, KB Electronics, and many other oriental machines. Before explaining
how to do it, please first keep in mind that it can be done if the voltage
that goes though the pot is +12vdc or less. This circuit cannot be used for AC
In most cases the terminals that go to the
potentiometer will carry these signals:
P1 = GND
P2 = WIPPER
P3 = REFERENCE VOLTAGE
These are the steps for replacing a potentiometer:
Measure the voltage difference between P1 and P3. Make sure it measures
Fine tune the analogue output to the output voltage you got from step 1
Connect the ground from the analogue output to the
ground of the potentiometer (P1).
Connect the analogue output to the wiper connection of
the potentiometer (P2).
SC1 Board Dimesion
For the SEIG X-3
Mill follow connections as
is not implemented in the Seig X-3 speed control
The final voltage
must be adjusted to 7Vdc.
The P1 and P2 must
be disconnected from the potentiometer and connected to Ground and analogue
output on the SC1 board as indicated opposite by the red lines
X-3 control board as viewed from inside the electrical cover at the back of the machine. Instruction sheet supplied with SC1 board for X-3 conversion.
Our policy is one of continual improvement therefore specifications may change without notice. Pictorial representations are intended as a guide only and may vary depending on machine model or product offered.