Solid State HF Welder
Vacuum Tube HF Welder
DC Drives (Analog Type)
Distribution panel (PCC-MCC-Braker)
Custom Build PLC Controlled Panels
DC Drive (Digital type)
AC Drive (Variable frequency drive)
DC DRIVES (Analog Type)


Sai Automation make DC Drives are highly sophisticated and provided with adjustments which are factory set and may require only slight re-adjust at the time of commissioning.

The drive is supplied normally in two parts i.e. DC Drive panel & one Pendent box.

DC Drives has been specially designed, it must be installed in all area, where the following conditions exists:

  • Ambient temperature does not exceed 45 0 C  & it is not less than 10 0C .
  • Ambient air is reasonable clean & dry and must be free of flammable or combustible vapours, steam  or corrosive gases.
  • Attitude should be 1000 meter above sea level maximum.
  • The clearance around the cabinet must be enough to provide full accessibility to the front and back side. Also Provide a non-restricted airflow from the intake and exhaust ventilation lowers.


  • High speed fuses in the incoming lines for protection   of thyristors.
  • di/dt protection
  • dv/dt protection
  • Surge suppressor across each thyristor
  • Electronic single phase protection
  • Electronic instantaneous over current trip
  • Over temperature protection for thyristor
  • Current sensing type field loss relay

Technical Specification

Input supply : 415volts +/-10% , 3 phase, 50 HZ.
Field voltage : 220V DC
Thyristor bridge configuration : Full wave, fully controlled using six Thyristors.
Output voltage : 440V DC infinite variable.
Speed regulation : +/- 1% using tacho generator feedback +/- 3% by using armature feedback.
Direction of rotation : Bi-directional.
Static over-current trip (SOT) : set for 150% peak of rated current.
Min. Voltage : Adjustable from 0 to 35% adjustable.
Max. Voltage : 85 to 110% of rated voltage.
Acceleration/Deceleration time : Independently adjustable from 2.0-30 sec.
Current limit  : Adjustable from 10% to 100% of full load Rated  current.


Home | About Us | Products & Services | Feedback | Contact Us
©2017 saiautomationtech.com, Powered By : Digitall Solution