User manual 09/2009 - Schneider Electric

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User manual 09/2009 - Schneider Electric

The Protection FunctionGround Fault ProtectionPresentationGround fault protection on Micrologic 6 E-M trip units is adapted to protecting all types of motorapplication against ground fault currents in the TN-S system (see Compact NSX circuit breakers - Usermanual).Operating PrincipleGround fault protection is definite time. It can be configured as Ig pick-up and as tg trip time delay.Tripping curve:No. Parameter Description0 In Trip unit setting range: Minimum setting/maximum setting = trip unit In rating6 Ig Ground fault protection pick-up7 tg Ground fault protection time delaySetting the Ground Fault ProtectionThe Ig pick-up can be set as follows:• On the Micrologic trip unit, preset by the Ig dial and fine-tuned on the keypad• Via the communication option using the RSU software, preset by the Ig dial on the Micrologic trip unitand fine-tuned via the RSU softwareThe tg time delay can be set as follows:• On the Micrologic trip unit, set on the keypad• Via the communication option using the RSU software64 LV434104 09/2009

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