FANOX SIA-B Series User Manual

Contents

FANOX SIA-B Series User Manual Manual pdf 32 page image

www.fanox.com Rev. 07 32/1384.12. Function CLP. Cold Load PickupThis unit is used to prevent undesired operations of the overcurrent functions in the cases where whenthe line is deenergized, all the loads enter at the same time.The settings of this function are as follows:Function Description Minimum Maximum Step Unit DefaultCLP (*) Cold Load PickupFunction Enable - - Yes/No - NoSettings group 1 4 1 - 4No Load time 0.02 300.00 0.01 s 15Cold Load Time 0.02 300.00 0.01 s 15(*) Optional depending on modelBoth time parameters have the following meaning:• No Load Time: If the circuit has been open for less time than the setting, the Cold Load Pickupfunction is not in working conditions.• Cold Load Time: After the circuit has been closed, during this time the new setting group isapplied. After this time, the relay returns to the adjusted setting group.The function operates according to the following automaton. The automaton consists of five states, inthree of those states the relay works with normal setting group (the Setting group adjusted in generalsettings), and in the other two, with the new settings group.The relay uses the current level to determine the circuit breaker state (open or closed). If the current isless than 60 mA, it is understood that the line is open, with an extremely low usage level (operating atnight, or on weekends). In one case or the other Cold Load is in working condition.The relay usually operates with the settings in their active Setting group. When the circuit breaker opens,a timer “No Load Time” starts. After this time, the relay considers that the circuit breaker is open, so theCLP function is in working conditions. Once the circuit breaker is closed, CLP function picks-up and“Cold load time” starts to count. During this time the relay will work with the new setting group regardlessof the circuit breaker situation, this is, without considering whether the circuit breaker is maintainedclosed or is open.