Can we bypass Altivar process drive like we can bypass Altistart?

Once you bypass the Altivar you are losing its best feature - to regulate motor speed.
But I can understand the use of Altivar only for starting high-torque applications, like mills, up-hill conveyors, crushers, mixers, etc.
Well, ATV is not so easy to bypass because there is energy conversion AC-->DC-->AC. The most sensitive is the Altivar output. Therefore the bypass is possible only if you disconnect Altivar output from the motor before connecting motor to mains using a bypass element (contactor for instance). Take this sequence seriously because if Altivar output gets connected to mains, short circuit in AAltivar occurs. Therefore the best idea is to use Altivar  output contactor with additional mechanical and electrical interlock between ATAltivar V output contactor and bypass contactor. After bypass activation, Altivar  input side can remain connected to AC mains or can be disconnected, it is fully optional.
1. Connect Altivar to mains and to motor
2. Start the motor.
3. When motor achieves full speed, activate freewheel stop (to avoid output phase loss on Altivar if output contactor gets open)
4. Switch off Altivar output contactor
5. Switch on bypass contactor
6. Optionally you can switch off ATV from mains, move it to garage or sell it.

Publié pour: Schneider Electric Belgium