Type SC Systems Control

Polyspede Type SC Systems Control is the flexible, cost effective way to form compact mini-systems for manual or automatic motion control. It combines the popular OC-2 SCR, DC drives with pre designed options and logic circuits. Three drive groups and four option groups insure fast economical systems makeup.

Basic Optional Functions

Dynamic Braking
Adjustable jog
Contractor Automatic Reversing

Tachometer Feedback Group

One Direction
Reversing

External Signal Control Group

Voltage Follower/Isolators
Tachometer Followers

Multiple Preset Speeds Group

Internal Potentiometers
External Signals

Design Features

• NEMAK (full wave with free wheeling diode) Power conversion stage sized for continuous full load operation with any DC motor designated for Type K service.
  
  
• Short circuit protection by sub cycle line fuses
  
  
• Voltage transient protection RC snubber across AC line. Movistor across power stage AC input and across motor field terminals on 230 volt models. Diode clipper on speed command input.
  
  
• Independent, Simultaneously operating torque and speed loops with sharp smooth transition provide optimum speed regulation and precise torque limit cut-in regardless of speed setting.
  
  
• External torque limit program terminals.
  
  
• Low level logic for options inter facing and low voltage operations
  Screw type input-output connections
  
  
• Moisture barrier on printed circuit paths, Conservatively rated components 100% inspection and final testing.
  

Details of Operation

Shown above is the block diagram for a typical Systems Control. The model in the diagram is an RSC with Preset Speeds. External Signal and Reversing Tach Feedback options. Also shown is contactor braking and reversing a standard RSC feature.

The Speed Control section is the specially adopted Model OC-2 SCR DC drive described on page3.

The Input/Output section interfaces between the speed control, the drive control operators and the options. Its configuration varies depending on the basic SC drive group selected.

Features:

• CMOS logic is employed
  
• Read and DIP relays prevent electrical noise
  
• Latching network allows use of simple momentary contact push buttons for operator commands.
  
• Isolated 12 VDC power supplies serve input/output section and various options.
  
• POWER ON timer disables control for 200 milli seconds alter turn on to insure power supply stability before drive start.
  
• Contactor timing an interlocks insure zero current switching on contactor models. Extend contactor life.
  

With this selection chart you can select the drive and options



How to specify and order by catalog number

To assign a catalog number, select the appropriate Drive Group code, followed by the Line Voltage/Horsepower code from the table at the right. Add the required option codes, separating the items with commas, as in the example. Review the selection chart and options descriptions to be sure the combinations of options are compatible.

Example
Catalog Number RSC-500, AR, TR2, S32, PS6

RSC = Contactor dynamic braking and reversing
500 = Rating of 230 VAC, 5 horsepower
AR = Adapted for automatic reversing
TR2 = Adapted for reversing feedback from a 50 VDC/1000 rpm tachometer
Mounted on the driven 1750 RPM base speed motor
S32 = Adapted to isolate and follow a 0-180 VDC armature when in the "auto" mode
PS6 = Programmable preset speeds.Six pots plus provision for one external
Signal from S32.

Line Voltage/HP Code