Schneider Electric PM5100 Control power wiring, Communications, Balanced system considerations

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PowerLogic™ PM5100 series user guide

Chapter 3—Hardware Reference

Balanced system considerations

In situations where you are monitoring a balanced 3-phase load, you may choose to connect only one or two CTs on the phase(s) you want to measure, and then configure the meter so it calculates the current on the unconnected current input(s).

NOTE: For a balanced 4-wire Wye system, the meter’s calculations assume that there is no current flowing through the neutral conductor.

Balanced 3-phase Wye system with 2 CTs

The current for the unconnected current input is calculated so that the vector sum for all three phase currents equal zero.

Balanced 3-phase Wye or Delta system with 1 CT

The currents for the unconnected current inputs are calculated so that their magnitude and phase angle are identical and equally distributed, and the vector sum for all three phase currents equal zero.

NOTE: You must always use 3 CTs for 3-phase 4-wire center-tapped Delta or center-tapped open Delta systems.

Control power wiring

For wiring instructions and safety precautions, see the meter installation sheet that was shipped with your meter, or download a copy at www.schneider-electric.com.

The meter can be powered from an AC or DC power source.

•L1 and L2 are non-polarized. If using an AC power supply with neutral, connect neutral to the meter’s L2 terminal.

•Always use a fuse on L1. Fuse L2 when connecting an ungrounded neutral to the control power.

•If using a control power transformer, fuse both primary and secondary sides of the transformer.

•The fuses / circuit breakers must be rated for the installation voltage and sized for the available fault current.

Communications

This section provides additional information about the communications ports and topologies supported by the meter. You must wire and configure the RS-485 port in order to communicate with the meter.

Serial communications

The meter supports serial communications through the RS-485 port. Up to 32 devices can be connected on a single RS-485 bus.

In an RS-485 network, there is one master device, typically an Ethernet to RS-485 gateway. It provides the means for RS-485 communications with multiple slave devices (for example, meters). For applications that require only one dedicated computer to communicate with the slave devices, an RS-232 to RS-485 converter can be used as the master device.

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Contents PowerLogic PM5100 Series Power and Energy Meter Page Please note Important InformationPage Ence Introduction Chapter Safety Precau TionsHardware Refer 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 Diagrams Symbol Description Power system Direct connect voltage limits Current TransformerMeter setting Power system setup parameters Power system descriptionSymbol 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 LEDMeter screen menus Notification iconsRelated topics PM5100 display screen menus Menu treeMeter setup screen navigation Front panel meter setupConfiguring the basic setup parameters Basic setup screenBasic setup parameters Basic setup menu treeParameter Values Description 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 menu tree Setting up the screen passwordsRegional settings setup parameters 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 parameterDemand setup menu tree Output setup Demand setupPower or current demand setup parameters 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 MnMxUsing software to view meter data Using ION Setup to view or modify configuration dataClock Input / Output Digital output setupDigital output applications Configuring digital outputs using the front panel Alarm / energy pulsing LED setupDigital output setup menu tree Navigate to I/O configuration Energy Pulsing Input / OutputPowerLogic PM5100 series user guide About Alarms AlarmsSecond 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 Verifying accuracy Testing overviewAccuracy test requirements Energy pulsing Reference device or energy standardLocation of energy pulsing LED PM5100Verifying accuracy test Percent error calculation Calculating total powerCalculating the number of required pulses 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 TroubleshootingPotential Problem Possible Cause Possible Solution TroubleshootingGetting Technical Support Register List 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 versionInitializing the meter Setting up the PM5111Locking or unlocking 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
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