User manual 09/2009 - Schneider Electric

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User manual 09/2009 - Schneider Electric

The Protection FunctionIg Pick-Up Setting ValueThe Ig pick-up setting value is expressed in multiples of In.The default Ig pick-up setting value is the same as the minimum value read on the dial:• 0.40 In for trip units rated 40 A• 0.20 In for trip units rated > 40 AGround fault protection can be deactivated by setting the Ig dial to the OFF position.Ground fault protection can be reactivated even with the Ig dial in the OFF position:• By fine-tuning on the keypad• Via the communication optionThe 2 tables below specify the setting values (preset by a dial) and setting ranges (set on the keypad):• For trip units rated 40 A• For trip units rated higher than 40 AOn the keypad, the step is 0.05 In.Rating 40 AType of Setting Value or Setting Range (xIn)Preset by a dial 0.40 0.40 0.50 0.60 0.70 0.80 0.90 1 OFFSetting range on thekeypad0.40 0.40 0.4...0.5 0.4...0.6 0.4...0.7 0.4...0.8 0.4...0.9 0.4...1 0.4...1 + OFFRating > 40 AType of Setting Value or Setting Range (xIn)Preset by a dial 0.20 0.30 0.40 0.50 0.60 0.70 0.80 1 OFFSetting range on thekeypad0.20 0.2...0.3 0.2...0.4 0.2...0.5 0.2...0.6 0.2...0.7 0.2...0.8 0.2...1 0.2...1 + OFFThe accuracy range is +/- 10%.tg Time Delay Setting ValueThe tg time delay setting value is expressed in seconds. The non-tripping and breaking times areexpressed in milliseconds.The default tg time delay setting value is 0 s with I 2 t OFF.Table of tg setting values with the I 2 t OFF/ON option expressed in second(s) and the associated nontrippingand breaking times expressed in milliseconds (ms).ParameterValuetg with I 2 t OFF (s) 0 0.1 0.2 0.3 0.4tg with I 2 t ON (s) — 0.1 0.2 0.3 0.4Non-tripping time (ms) 20 80 140 230 360Maximum breaking time (ms) 80 140 200 320 500I 2 t ON/OFF FunctionGround fault protection is a short-circuit protection like short time protection. The same operating principleapplies as for the I 2 t function (see Short Time Protection, page 43).Ground Fault Protection TestThe ground fault protection test can be performed on the keypad of the Micrologic trip unit (see GroundFault Protection Test (Micrologic 6), page 22). This test can be used to check the trip unit’s electronictripping function.LV434104 09/2009 47

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