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Denz26
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Joined: 22-June 09
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Last Seen: 22nd June 2009 - 02:21 AM
Local Time: Mar 17 2010, 12:22 AM
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22 Jun 2009
Hello, I am new in this site. Just want to know if its allowed to use one overload for two motors, they are the motors in each side of a Overhead crane. If so, how do I set the overload? Should I add the FLC of each motor? thank you QUOTE (marke @ May 5 2009, 04:40 AM)  Hello Froilan There is a 15% safety margin in the ratings of the motors to allow for tolerances in the calibration of the protection devices. Theoretically, a protection device must not trip at less than rated current and must trip at 115% rated current. Typically, with good protection relays, the average trip point is in the order of 105% rating, but commonly there are 3% - 5% tolerances in CTs etc. If you set the trip point at 115%, you can expect the motors to trip at 120% - 125% on average. This is enough to shorten the life of the motor. If the protection operates late, the motor can operate at a higher temperatures and not necessarily fail immediately. Every ten degrees C hotter you run the motor, you halve it's life, so you may not see the effects of a higher overload setting for some time. Best regards, Mark. |
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Lo-Fi Version | Time is now: 16th March 2010 - 02:22 PM |
