VFD Bypass DOL Starter Panel Manufacturer in India

Shri Shyam Engineers

Keeping the motor running even if the drive fails

For some applications, stopping is simply not an option. A water supply pump, a cooling fan or a ventilation system may need to run whatever happens. A VFD with a DOL bypass gives you a second way to start the motor if the drive is under repair.

The panel has two paths. In normal use, the motor runs through the drive, giving speed control and energy savings. If the drive trips or needs servicing, a changeover switch sends power directly to the motor through a DOL starter, and the process keeps going at full speed.

The most important detail is interlocking. The drive output and the direct supply must never be connected to the motor together, as that can destroy the drive. We use mechanical and electrical interlocks, and we test the changeover carefully before the panel leaves us.

Bypass panels are popular in buildings, water treatment plants and process industries. They also help when a drive has to be sent away for repair, since production continues meanwhile. Many customers tell us the peace of mind alone justifies the extra cost.

We build these for a wide range of motor sizes, with manual or automatic changeover. Share your motor details and how critical the load is, and we will recommend the right arrangement.