Reacceleration Protection |
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Reacceleration Protection |
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 Sep 6 2007, 05:03 AM
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#1
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Junior Member  Group: Full Member Posts: 7 Joined: 5-September 07 Member No.: 3,743  |
What is Reacceleration protection in Induction motor?
Please clarify this. |
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Sep 6 2007, 07:41 PM
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#2
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 Member Group: Full Member Posts: 198 Joined: 15-March 05 From: Milan, Italy Member No.: 1,068 |
VSP,
one possible reply is: big motors cannot be started too frequently, specially if load inertia is high. For some minutes after starting, during deceleration for loss of power, this protection will avoid that the motor will restart, reaching an hot temperature in the rotor. Other explainations are possible. Regards Mario -------------------- |
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Sep 7 2007, 05:11 AM
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#3
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 Posting Freak Group: Moderator Posts: 641 Joined: 22-February 03 From: USA, California Member No.: 285 |
Another version is to protect against short term power losses that may allow a motor to be reconnected to the line before the magnetic field collapses. If that happens, the motor may still be in regeneration and when reconnected, the two power sources are out of sync, which causes a violent voltage spike. Re-acceleration protection just ensures that on 2-wire control systems, if the power goes out, however briefly, there will always be a delay of a few seconds before the motor controller reconnects to the line.
-------------------- "He's not dead, he's just pinin' for the fjords!"
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Sep 7 2007, 06:40 AM
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#4
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Junior Member Group: Full Member Posts: 7 Joined: 5-September 07 Member No.: 3,743 |
QUOTE(jraef @ Sep 7 2007, 10:41 AM) [snapback]6714[/snapback] Another version is to protect against short term power losses that may allow a motor to be reconnected to the line before the magnetic field collapses. If that happens, the motor may still be in regeneration and when reconnected, the two power sources are out of sync, which causes a violent voltage spike. Re-acceleration protection just ensures that on 2-wire control systems, if the power goes out, however briefly, there will always be a delay of a few seconds before the motor controller reconnects to the line. Is that mean Re-accleration protection stop motor has voltage spike(supply voltage drop below undervoltage) occurs and Start motor after specifid delay? |
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