If I have a 208VAC AB phase (from a 3 phase supply) powering five 220V motors, is it best to have a step up transformer or just go ahead and use an isolation transformer rated at 208 Or 220 – between the motors and where they tap off of the supply phase. The main reason I’m doing this is to...
Two Questions:
1) In the past we have used five SCR Drives to run five small motors. Since only one motor actually needs directional/speed control, is it bad design practice to use AC induction motors operated by SSR’s (Power-IO H Family SSR’s) for the four motors that do not need...
Look in to these products; they can switch 10A@120V
TI 2CR Motor Starting Relays
http://www.ti.com/snc/products/controls/motor-2cr.htm
Power-IO H Family SSRs
http://www.power-io.com/products.htm
Three Questions:
1) In industrial controls in the U.S., when using 3-phase is it more common to use 208 or 220 VAC per delta phase?
2) If a few intermittently operating 1 hp motors are tapped off of one phase of a 3-phase system, is it a go idea to install a transformer between the motors and...
Thanks for the feedback wareagle. In reality yes, the wattage is the same whether it’s 3 phase or single phase; however, the power company will “compute the demand used for billing purposes on the assumption that the load on each phase is equal to that of the phase with the greatest load.”
I have 4 systems used to perform a process – a press, extruder, and two ovens. In the past three of the four units were 240-230V single phase systems with one of the ovens being a 3 phase 208V system (Delta).
Someone told the ME I’m working with that the three phase saves on your electrical...
