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AC Motor Control Drawing - Discussion Hosted By Nick #4574 10/02/01 10:18 AM
Joined: Oct 2000
Posts: 2,721
Scott35 Offline OP
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Discussion thread regarding Schematic drawing by ECN's Member "Nick", posted in the Technical Reference Area under the Topic heading:

AC Motor Control Schematic - Per ECN Member

Post your comments and/or questions here regarding Nick's drawing, for him to comment to.

Scott SET. 07/07/2001 07:17:00

edit= embedded hyperlink to schematic

[This message has been edited by Scott35 (edited 10-02-2001).]


Scott " 35 " Thompson
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Re: AC Motor Control Drawing - Discussion Hosted By Nick #4575 10/04/01 05:27 PM
Joined: Aug 2001
Posts: 142
B
bordew Offline
Member
Quote
Originally posted by Scott35:
Discussion thread regarding Schematic drawing by ECN's Member "Nick", posted in the Technical Reference Area under the Topic heading:

AC Motor Control Schematic - Per ECN Member

Post your comments and/or questions here regarding Nick's drawing, for him to comment to.

Scott SET. 07/07/2001 07:17:00

edit= embedded hyperlink to schematic

[This message has been edited by Scott35 (edited 10-02-2001).]

I believe this is a Star-Delta reduced voltage motor starter, I have always seen them with a UV relay in the seal in circuit, for added protecction.

Re: AC Motor Control Drawing - Discussion Hosted By Nick #4576 10/04/01 10:40 PM
Joined: Aug 2001
Posts: 599
N
Nick Offline
Member
Yes, that's exactly what it is. A closed transition wye-delta starter. Could you expand on the under voltage realy?
Nick

Re: AC Motor Control Drawing - Discussion Hosted By Nick #4577 10/05/01 06:55 PM
Joined: Aug 2001
Posts: 142
B
bordew Offline
Member
Quote
Originally posted by Nick:
Yes, that's exactly what it is. A closed transition wye-delta starter. Could you expand on the under voltage realy?
Nick

There are two general types of low-voltage devices, one of these provides low-voltage release, ie a power failure or a substantial voltage dip interrupts the power flow but does not prevent the reestabliahment of the main circuit when the voltage is restored.
The other is a true undervoltage relay an offers protecction and has to be reset after a power failure.
Timing circuits are often used in this type circuit to help prevent automatic restarting when it is not desired.


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