Eaton Cooper Power Series Installation, Operation And Maintenance Manual

Also see for COOPER POWER SERIES: Installation and operation instructions Installation instructions Installation instructions Installation and operation instructions Operation instructions

Contents

Eaton Cooper Power Series Installation, Operation And Maintenance Manual Manual pdf 129 page image

Section 6: Control featuresCalendar/clockIntegral to several functions of the control is an internalreal-time calendar/clock. The clock maintains the year,month, day, hour, minute and seconds, within 1 second. Thedisplay format is user-selectable (see FC 942 and FC 943).The control time is synchronized to the system frequencywhen powered by AC. When ac power is lost, the clockmaintains time for approximately four (4) days, by usinga crystal oscillator and a capacitor as the power source.Twenty minutes on ac power is required to fully charge thecapacitor.The LCD displays the current date and time at the end ofthe self-test when the front panel is turned on. However,upon power-up after extended loss of power, the controlclock time and date will default to midnight, January 1,1970.The date and time can be read and set at FC 50. Whensetting, all of the digits must be entered using the standard24-hour format (MM/DD/YYYY hh:mm). If an error is madewhile entering the values, backspace using the left arrowkey.Time zone settings are available. ProView NXG software isrequired to select a time zone setting; available time zonesare all with respect to Greenwich Mean time. The time zonesetting can be viewed using FC 50 and pressing the downarrow key once.MeteringThe control has extensive metering capabilities, whichare categorized as Instantaneous, Forward Demand, andReverse Demand.Instantaneous meteringInstantaneous metering values are refreshed once eachsecond. The information may be accessed using the frontpanel HMI under the METERING menu. See Table 9 fora list of available metering values under this menu. SeeTable 10 in Section 5: Control programming for moreinformation on the function codes.Demand meteringThe control provides forward and reverse demand meteringinformation for numerous parameters. When applicable,the present value, high value since last reset and low valuesince last reset are recorded. For the low and high values,the earliest time and date of occurrence are also recorded.Additionally, the power factor at kVA-high demand and kVA-low demand are recorded. All demand metering values arestored in non-volatile memory separately for forward andreverse power conditions.Demand metering values may be accessed using thekeypad under the METERING menu; see Table 9 fora list of available metering values under this menu.See Table 10 in Section 5: Control programming forinformation on the function codes associated with demandmetering.Demand task operationThe demand metering function is based upon a slidingwindow concept, or moving integral. The algorithmimplemented simulates the response of a thermal demandmeter which will reach 90% of its final value after onedemand interval in response to a step function input. SeeFigure 21.The task works like this:1. For three (3) minutes after a power outage or powerreversal, no demands are calculated. This allows theutility system to stabilize from the event which createdthe outage or power reversal.2. At three (3) minutes, the present demands (forthe appropriate power direction) are set to theircorresponding instantaneous value and the integrationalgorithm begins according to the programmed demandinterval at FC 46.3. At fifteen (15) minutes or at the demand time interval(whichever is longer), the high/low demand valuesbegin to track the present demand, similar to draghands. All demand values are calculated continuouslyand, if a change has occurred, the high/low demandsare stored in the non-volatile memory every fifteen(15) minutes. This prevents loss of data during a powerinterruption or outage.Notice that the provisions are made to reset any demandvalue individually using the ENTER key, or all demandvalues can be reset simultaneously by entering FC 38. Highand low values will be set to their corresponding presentdemand value, and the dates and times will be set to thepresent date/time.Two conditions can cause the present demands tobe invalid: The power has just been applied (within the3-minute freeze period) or the power flow has changeddirection. If the control is metering in the forward direction,the reverse present demands will be invalid; if metering inthe reverse direction, the forward present demands will beinvalid.100%90%6T0 1T 2T 3T 4T 5TDemand Time IntervaltFigure 21 Demand time interval response123INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS MN225003EN April 2018CL-7 Voltage Regulator Control