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3RW4 tripping on thermal overload

11/23/2012 7:36 AM	Rate (0)
sparten Posts: 205 Rating: (11)	Hi Expeert, i am using SIRIUS SOFT STARTER with part no 3RW4046‐1BB14(45kw) ...i have connected motor of 10amp,5.5kw... my problem is that when ever i gave start command to soft stawrter motor run for while and then after soft starter got tripped on fault "Thermal Overload on Device" (Device led light yellow and Bypass/Failure led light up Red Continuos) .. .is it due to small range motor conneced to soft starter??? or another setting problem in Soft starer??? i have set Ie=42.5,Rampup time=10s ,tripping class=10,rampdown time=10s,current limit(*ie)=2
sparten Posts: 205 Rating: (11)
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11/23/2012 3:22 PM	Rate (0)
LesPaul Posts: 467 Rating: (59)	hello, Yes ist because of a to small motor. The softstarters 3RW40 do need a Minimum load20% of minimum selectable rated motor current Im (at least 2 A). That means in your case: Ie=80A / Im=43A 43A x 20% = 8,6A minimum. Your nominal current of the motor is 10A, so only in case of a fully loaded motor (--> 10A)the softstarter will not trip with failure (DEVICEgreen & FAILURE red). ==> While starting you will have more than the necessary current of 8,6A, but after the motor has reached nominal rpm it seams that you have less than 8,6A. kind regards LesPaul
LesPaul Posts: 467 Rating: (59)
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11/24/2012 9:28 AM	Rate (0)
sparten Posts: 205 Rating: (11)	Hi LesPaul, thank you very much for your technical replay..this information will help me in future also......
sparten Posts: 205 Rating: (11)	Last edited by: sparten at: 11/24/2012 9:28 AM
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4/29/2015 4:09 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122)	New question published by wlozano is split to a separate thread with the subject 3R44 Soft Starter, warning 'Prewarning limit motor built-up'. Best regards Min_Moderator

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