• Description
  • Features
  • Benefits
  The MSC I™ is a microprocessor based stepper motor controller which provides a 1/10 micro stepping output to operate most stepper drive motors requiring 1.0 – 6.5 amps/phase current.  The controller is designed to be used with the CWT torch positioning slides and the CWT weld sequence controller.  It can also be used as a stand-alone positioning controller.  The MSC II has an isolated RS-485 port, which can be configured to allow off-line programming and control of the stepper motor.  The MSC II can be configured to use the Local Area Network (LAN) port which allows the CWT weld sequence control to program and control the CWT torch positioning slide assemblies.

The MSC II provides a constant current Sine/Cosine output to operate two-phase stepper motors.  The output phase current can be user programmed from 1.0 – 6.5 amps.  In the 1/10 step mode each step of the motor is subdivided into 10 micro steps.  When using a 200 step/revolution motor the MSC II will provide a 2000 step/rev output at a maximum speed of 240 rpm.

The MSC II controller should be located near the stepper drive motor it is controlling. The maximum motor drive cable length is 75 ft. Mount the MSC II controller in a location that allows easy access to the front and rear panel.  Figure 2-1 shows the mounting pattern for the control enclosure.

The MSC II provides two limit switch inputs, which are used to prevent over driving the mechanical slide assembly and to establish a home position.  The MSC II provides a power down brake output, which can be used to operate a electro-mechanical motor brake.

The MSC II is designed for use with Computer Weld Technology's controller using serial LAN communication or it can be configured for use through a standard RS-485 serial port using ASCII serial commands.  It can also be configured to use Modbus RTU protocol over the RS-485 serial port.
Compact / Lightweight design
Flexible design
Isolated RS485 Modbus RTU communications port
Two limit switch inputs
Power down brake output
Operates on Computer Weld Technology's LAN system


Provides expanded operational capability
Permits off-line programming, system configuration and remote control
Usable in confined areas
Can be interfaced with other manufacturers equipment
Facilitates ease of installation and operation


Product Specifications




  • General
  • Control
Dimensions 4.75"h x 2.0"w x 11.0"l (120.6mm x 50.8mm x 279.4mm)
Mounting Dimensions 1.25" wide x 10.25" long, four 0.25” diameter hole
Weight 4 lbs (1.18 kgms)
Power Input 120 ± 10% vac 50/60 hz @ 5.0 amps
Operating Temperature -10° F to +140° F (-23° C to +60° C)
Motor Output Current 1.0 - 6.5 amps peak each phase
Motor Output Voltage 1.5 -18.0 volts peak each phase
Current Profile Sine/Cosine
Limit with Inputs CW and CCW 5.0 vdc active low inputs with internal 4.7K ohm pull up resistor
Brake Solenoid Output 24 vdc @ 0.5 amp for 0.5 seconds then 2.0 khz PWM modulated for 12 vdc hold-in voltage @ 0.5 amps
Step Resolutions 10 micro steps/step
Velocity 10 - 8000 steps/sec.
Acceleration 10 - 1000 steps/sec²
Index step count 1 - 65535 steps
Index Scale Factor 1-255 steps/step scale factor
Communications Isolated RS485 19,200 Baud Modbus RTU port

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10702 Old Bammel N. Houston Road, Houston, TX 77086 USA - Phone: 713-462-2118 - Fax: 713-462-2503