Schneider Electric PM5100 manual Current demand, Predicted demand, Thermal demand

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PowerLogic™ PM5100 series user guide	Chapter 8—Measurements and calculations

8:00 am, select 0800 (in hhmm format). When setting up this type of demand, you can choose Clock Sync Block (clock-synchronized block demand) or Clock Sync Roll Blk (clock-synchronized rolling block demand). Clock Sync Roll Blk requires that you specify a subinterval.

Thermal demand

Thermal demand calculates the demand based on a thermal response, which imitates the function of thermal demand meters. The demand calculation updates at the end of each interval. You can set the demand interval from 1 to 60 minutes (in 1-minute increments).

The following illustration shows the thermal demand calculation. In this example, the interval is set to 15 minutes.

Thermal demand example

The interval is a window of time that moves across the timeline

99%

90%

% of Lead

0%

	15-minute	next
		15-minute
	interval
		interval

Last completed demand interval

Time

(minutes)

Calculation updates at the end of each interval

Current demand

The power meter calculates current demand using one of the methods described in “Power demand calculation methods” on page 63. You can set the demand interval from 1 to 60 minutes in 1-minute increments (for example, 15 minutes).

Predicted demand

The power meter calculates predicted demand for the end of the present interval for kW, kVAR, kVA and Amps demand. This prediction takes into account the energy consumption so far within the present (partial) interval and the present rate of consumption.

Predicted demand is updated every second.

The following illustration shows how a change in load can affect predicted demand for the interval. In this example, the interval is set to 15 minutes.

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Contents PowerLogic PM5100 Series Power and Energy Meter Page Please note Important InformationPage Hardware Refer Introduction Chapter Safety Precau TionsEnce Chapter Measurements Chapter AlarmsCalculations Chapter MID ComplianceGlossary Table of Contents PowerLogic PM5100 series user guide Parts and Accessories Power and Energy Meter HardwareBox Contents IntroductionIntroduction Before You Begin Safety PrecautionsPowerLogic PM5100 series user guide Functions and Characteristics Models, Features and OptionsPM5100 Series Models, Features and Options Functions and CharacteristicsTechnical Specifications Environmental Characteristics Mechanical CharacteristicsSafety Safety precautionsElectromagnetic Compatibility CommunicationMeter mounting DimensionMounting the PM5100 Serial No Description Specification Meter wiringMake Part code Description Recommended cables3CT 2CT Wiring DiagramsSymbol Description Power systemDirect connect voltage limits Current TransformerSymbol Power system setup parameters Power system descriptionMeter setting Voltage input protection Voltage and current input wiringCurrent input protection Direct connect maximumCommunications Control power wiringBalanced system considerations Serial communicationsRS-485 network configuration RS-485 wiringRS-485 cable RS-485 maximum cable lengthDigital output connections Digital outputsPowerLogic PM5100 series user guide Hardware Reference LED indicators Front panel display and meter setupAlarm / energy pulsing LED modes Heartbeat / communications LEDRelated topics Notification iconsMeter screen menus PM5100 display screen menus Menu treeMeter setup screen navigation Front panel meter setupConfiguring the basic setup parameters Basic setup screenParameter Values Description Basic setup menu treeBasic setup parameters Setting up serial communications Communications setupSerial communications setup menu tree Communications setup parametersSetting up the display HMI settingsSetting up regional settings Display setup menu treeRegional settings setup parameters Setting up the screen passwordsRegional settings menu tree Lost password Setting the clockPassword setup menu tree Password setup parametersClock setup parameters Advanced setupAdvanced setup menu tree Parameter Format DescriptionAdvanced setup parameters Setting up the alarm / energy pulsing LEDAlarm / energy pulsing LED settings menu tree LED setup parameterPower or current demand setup parameters Output setup Demand setupDemand setup menu tree Remote Meter Setup Alarms setupFront panel display and meter setup Viewing meter data from the front panel Viewing Meter DataMeter data display screens Displaying data screensVolts U-V Power PQSHarm Energy ETimer AlarmUnbal MnMxClock Using ION Setup to view or modify configuration dataUsing software to view meter data Digital output applications Digital output setupInput / Output Digital output setup menu tree Alarm / energy pulsing LED setupConfiguring digital outputs using the front panel Navigate to I/O configuration Energy Pulsing Input / OutputPowerLogic PM5100 series user guide Second Alarms AlarmsAbout Alarms Alarm List of Standard 1-Second Over/Under AlarmsAlarm Priorities Unary AlarmsAlarm Setup Setting Up 1-Second Alarms Setting Up 1-Second Alarms Setting Up Unary Alarms Viewing Alarm Activity and HistoryViewing Active Alarms and Alarm Counters Viewing Unacknowledged Alarms and the Alarm History Log PowerLogic PM5100 series user guide Alarms Measurements and calculations Power factorReal-time readings EnergyPower factor sign convention Power factor min/max conventionIEC mode Power factor minimum and maximumIeee mode Power demand calculation methodsDemand Block interval demandBlock interval demand example Synchronized demandPredicted demand Current demandThermal demand Thermal demand examplePredicted demand example Peak demandHarmonic content calculations Power qualityHarmonics overview Total Harmonic Distortion and Total Demand DistortionDisplaying harmonics data Viewing harmonics using the front panelTHD and thd calculations TDD calculationPower Quality display screen Viewing THD/thd using the front panelViewing TDD Example 7th to 15th harmonics for line-to-neutral voltageRelated topics Accuracy test requirements Testing overviewVerifying accuracy Energy pulsing Reference device or energy standardLocation of energy pulsing LED PM5100Verifying accuracy test Calculating the number of required pulses Calculating total powerPercent error calculation Total power limit for digital output Total power limit for alarm / energy LEDEnergy pulsing considerations VT and CT considerationsTest points Typical sources of test errorsWatt-hour test points example Var-hour test points exampleFront panel meter reset screens Meter resetsGlobal resets Reset menu treeSingle reset options Single resetsAlarm counter options Alarm counter Option DescriptionPowerLogic PM5100 series user guideChapter 11-Meter resets Meter resets Password Recovery Maintenance and UpgradesPower Meter Memory Identifying the Firmware Version, Model, and Serial NumberAdditional Meter Status Information Control PowerDownloading Firmware MeterHeartbeat/Comms LED TroubleshootingGetting Technical Support Register List TroubleshootingPotential Problem Possible Cause Possible Solution MID Compliance Specifications relevant to MIDMID overview MID compliance for the meterMID Compliance Installation and wiringPM5111 default screen Installing the terminal coversDefault PM5111 display screen Location of terminal coversLock-protected setup parameters MID-protected setup parametersLock-protected setup parameters Meter firmware versionLocking or unlocking the meter Setting up the PM5111Initializing the meter Irrecoverable Password Setting up lock passwordTerms GlossaryPowerLogic PM5100 series user guide Abbreviations PowerLogic PM5100 series user guide Page Schneider Electric 35, rue Joseph Monier CS