ECN Forum Forums Technical Discussion Electrical Theory and Applications Motor Hook 12 lead

Scott,
If there is a high starting torque required, wouldn't the use of wye/delta starting increase the likelyhood of the motor stalling?
Don

This thread's subject is definitely worthy of some Schematics!
I'll cook up some with low and hi volts arrangements.
Being that the Nameplate of this Motor shows 200/400 VAC, the Delta Run config with low voltage jumper terminations on the 208 VAC System should be OK.

Don,

I was thinking lower speed/torque starting application to get things moving (things being some fluid and the Motor's Rotor), then applying Motor across the Line after a few seconds.
Along with this, there may be some problem with high enough System Voltage at the time of starting (things faulting out from the fire, just flat-out lower than normal Line Voltage at the time of starting, etc...), which is another reason why I chose to go down this particular thought path.


Like I said, most likely not correct, but worth a thought!

Seems the flicker factor of starting this Motor is overridden by the need to get the Fire put out
(or: Sorry for the lights dimming people, we have more important issues to address - one being these frikken flames are growing in intensity!!! Scenario).

Could you explain the benifits of a Reduced voltage (Wye/Delta) Starter for the 20 HP Fire Pump?

I'm at a loss, except for the reason previously mentioned; so if anyone has the definite reasoning, please pass it on!

Scott35

Scott,
Maybe that was the only way to comply with 695.7.
Don

That's a funny; prevent a 15% voltage drop by intentionally applying 42% voltage drop

-Jon