VFD Applications

Motor Starter and Variable Frequency Drive applications range from a simple stand alone starter application to a full blown Starter/VFD/Bypass system. On the VFD side, most applications require careful sizing of the system components as well as proper feature selection (Vector/Frequency/Servo control VFD, external references, communication, etc.). The starter applications (across-the-line or soft-start with a bypass) typically present complications only when large motors are involved (200 HP and higher). In such cases, a system simulation to assess large motor starting current effects is advisable to avoid voltage stability problems in the facility.

PowerCore Engineering helps with such aspects of independent Customized VFD/Starter Application as:

  • VFD/Starter selection based on process requirement
  • System simulation of the large starter application (across-the-line vs. Soft-start)
  • Line/Load reactors for VFD selection
  • Drive/Starter supply, installation, and programming
  • External control interface (Digital and Analogue controls)
  • Communication interface to external SCADA or energy management systems
  • Control and interface drawings

A VFD or a soft starter installed can be a very effective and economical way to control large motor loads. Having it properly sized and selected can avoid many problems and pitfalls that may be associated with such an application.


Outdated drives or motor starters, a customized control system or a specialized I/O rack breakdown wreaks havoc on any production schedule. Moreover, if the original supplier or installer is not available small failures easily morph into huge problems if the solutions are not administered promptly.

PowerCore offers help in such cases with:

  • On-site/Off-site troubleshooting and repair of industrial and commercial electrical and electronic equipment
  • Reverse engineering (re-constructing system drawings and operation manuals in the absence of the original documentation)
  • Outdated and rare equipment sourcing
  • Replacement of obsolete parts with up-to-date equivalents
  • Re-design and supply installations for unrepairable components or systems