Clevername
Member
From my understanding it seems the industry is moving away from DC to AC motors. The thought of no brushes/maintenance wise is appealing and the cost is very lucrative now.
I started a little project using some Schneider Altivar 32 drives. My big issue is how to handle the regen and braking. With DC this is a none issue but with the AC drives I see some real draw backs now. These drives are capable of sharing the DC bus which will help dissipate some of it. Is it normal practice to share the DC bus to help with braking or should I just get a braking resistor for each drive?
If for example each drive can disapate 30% (without a braking resistor) of the load would they in fact dissipate 60% as long as each drive is not braking at the same time?
I also have to size another breaking resistor for a 15 HP drive with a cycle time of about a minute and 10 second braking time to 0 speed.
Anyone start doing a swap over from DC to AC?
I started a little project using some Schneider Altivar 32 drives. My big issue is how to handle the regen and braking. With DC this is a none issue but with the AC drives I see some real draw backs now. These drives are capable of sharing the DC bus which will help dissipate some of it. Is it normal practice to share the DC bus to help with braking or should I just get a braking resistor for each drive?
If for example each drive can disapate 30% (without a braking resistor) of the load would they in fact dissipate 60% as long as each drive is not braking at the same time?
I also have to size another breaking resistor for a 15 HP drive with a cycle time of about a minute and 10 second braking time to 0 speed.
Anyone start doing a swap over from DC to AC?