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#4574 - 10/02/01 07:18 AM AC Motor Control Drawing - Discussion Hosted By Nick
Scott35 Offline

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Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA
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).]
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#4575 - 10/04/01 02:27 PM Re: AC Motor Control Drawing - Discussion Hosted By Nick
bordew Offline
Member
Registered: 08/27/01
Posts: 142
Loc: Vienna,Ohio, USA
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.
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#4576 - 10/04/01 07:40 PM Re: AC Motor Control Drawing - Discussion Hosted By Nick
Nick Offline
Member
Registered: 08/13/01
Posts: 599
Loc: Riverside, CA
Yes, that's exactly what it is. A closed transition wye-delta starter. Could you expand on the under voltage realy?
Nick
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#4577 - 10/05/01 03:55 PM Re: AC Motor Control Drawing - Discussion Hosted By Nick
bordew Offline
Member
Registered: 08/27/01
Posts: 142
Loc: Vienna,Ohio, USA
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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