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TN system : Earth fault protection for Sinamics S120

5/18/2012 12:30 PM	Rate (0)
Ajay Gupta Posts: 58 Rating: (19)	Dear Friends, How can we implement earth fault protection for TN system (grounded system) in Sinamics S120 ? I havefound that benderinsulation monitorcan only be connected in IT system. Canbender relaybe used for TN systems orcan we use some product from other manufacturer for earth fault protection ? Thanks. Regards Ajay Gupta
Ajay Gupta Posts: 58 Rating: (19)
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6/19/2012 11:09 AM	Rate (0)
Ajay Gupta Posts: 58 Rating: (19)	Dear Experts, We have connected 5 small motors at the output of the S120 motor module. Each motor is having a 3RV type MPCB before it. The customer demands that each motor should be protected against earth fault. Initially we designed the circuits using 3RB21 type of relays for each motor for earth fault detection. Now we found out that the 3RB21 relays can't be used at the output of the frequency converter (Siemens service support confirmed that this may cause nuisance tripping of the relays). Please suggest me some suitable device/module from Siemens or other manufacturer for detecting earth fault even at the output of the converters. Thanks & Regards Ajay Gupta
Ajay Gupta Posts: 58 Rating: (19)
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8/18/2015 11:13 AM	Rate (0)
Min_Moderator Posts: 4757 Rating: (122)	New question published by U_02e254fa-544f-4712-803a-3a7f2ae50dad is split to a separate thread with the subject G120C, protection method for ground faults to prevent fires. Best regards Min_Moderator
Min_Moderator Posts: 4757 Rating: (122)
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