In many critical applications, system downtime due to the VFD fault or failure is not affordable especially when the consequence of the failure puts the life, safety or system integrity at risk. Other than this, the system down times also has many other consequences like loss of production, inferior product quality, system shut down etc.
Many years ago, VFDs being new to the industry, were considered less reliable. So, a bypass was a sensible addition to a drive system to maintain operation while a VFD is under breakdown.
Today’s VFDs are robust, reliable and at the same time user confidence is also very high. So, installing a bypass in non-critical application is not required. Sometimes the cost of bypass is as much high as adding a second VFD. If installed, bypass is helpful in non-critical application as a short term arrangement but not suitable for the critical applications.
There are many reasons like the limited constant-speed / full-speed operation in bypass mode not only eliminates the advantages of a VFD, it can actually damage system integrity. For example, many variable air volume systems cannot withstand the full volume and pressure of full-speed bypass operation.
When your critical application needs bump-less bypass in practically no time without any major change in motor speed, we have a solution for you.
Amtech offers Hot Standby Redundant VFD System which is utmost reliable and efficient solution.