Sepam - HV/MV Protection and control units (ENG) - Trinet

Starts per hour protectionANSI code 66function n°F421Equipmentc single-phase or three-phase current generatorc ammeterc adapter for ECA modulec chronometerc calculatorc documentationWiringc diagram B1 or B2 or B8c protective relays:F421/1 total or consecutiveF421/2 consecutiveF421/3 totalF421/4 lock-out between starts by TTestc read the section entitled measurement and testingmethodThis protection function is linked to thermal overloadprotection.The test is largely dependent on the use of protectiverelays in program logic, in particular for the assignedmessages and lock-outs. This is why the descriptionswhich follow mainly apply to the standard schemes,but may still be used for other customizedapplications.c status parameter settingv select the value of the CT primary circuitsv check the microswitches (1 A or 5 A) whichcorrespond to the CT secondary circuitsv or check and set the microswitches on the ECAmodulec thermal overload protection parameter setting(see section on thermal overload protection)Procedurec Protection parameters setting: Start/Hourv set: N Start = number of permissible consecutive starts per hourv set: C Start = number of permissible consecutive starts for a motor for which theheat rise Heating has reached the thermal overload set point OL1.v set: C Start = number of permissible consecutive starts for a motor for which theheat rise Heating is below the thermal overload set point OL1.v set T: to temporarily disable (1) start orders which follow stop orders(in systems, this time is linked to the type of load driven by the motor)v disable the O/C, Unbalance and E/F set points (2) if the sum of the 3 CTs is used.Testing of total number Ntc parameter settingv enter the password and press the "clear" key before starting the testv set N Start = H Start = C Startc testv inject a current greater than 5% of Ibv stop injection for a time period greater than TRemark:If current injection is controlled by a static contactor, it is necessary to ensurethat leakage current is less than 5% of Ib and does not interfere with testing.v repeat this operation N Start timesv at the same time, use the pocket terminal to check that the number of remainingstarts decreases on the counterv the display indicates the waiting period at the N th Start time before the motorcan be started again.This time is calculated as follows:60 mn - (time of N th Start - time of first start included in the calculation period).c Example with total starts.1 2 3 4 5T T T T60mn conveyor belt01mn2mn10mn6th possibleImage of waiting period between starts (N Start = 5)(1)this function may only be activated if your program logic has beencustomized.(2)remember to reactivate the protections at the end of testing.1/28Sepam 2000 - Testing