Siemens MD-P1 User manual

125-201
Smart Infrastructure
09/30/2019
125-201, Rev DA
MD-P1 and MD-P1D Model
Power Meters
User Guide

Copyright Notice
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Copyright Notice
Notice
Document information is subject to change without notice by Siemens Industry, Inc.
Companies, names, and various data used in examples are fictitious unless otherwise
noted. No part of this document may be reproduced or transmitted in any form or by
any means, electronic or mechanical, for any purpose, without the express written
permission of Siemens Industry, Inc.
All software described in this document is furnished under a license agreement and
may be used or copied only in accordance with license terms.
For further information, contact your nearest Siemens Industry, Inc. representative.
Copyright 2019, Siemens Industry, Inc.
To the Reader
Your feedback is important to us. If you have comments about this manual, please
submit them to: [e-mail]
Other product or company names mentioned herein may be the trademarks of their
respective owners.
Printed in the USA.

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Table of Contents
Introduction..............................................................................................................................5
Product Description ..............................................................................................................5
Meter Anatomy .....................................................................................................................8
Safety Summary and Specifications ....................................................................................8
Sommaire des informations de sécurité........................................................................10
MD Power Meter Technical Specifications....................................................................12
Maintenance.......................................................................................................................14
Installation..............................................................................................................................16
Mounting the MD-P1 and MD-P1D Power Meters .............................................................16
Connecting the MD-P1 and MD-P1D Power Meters..........................................................17
Completing the Wiring Connections - RS-485, Voltage Leads and CTs.......................18
Setting the P1 Address.......................................................................................................22
Powering the MD-P1 and MD-P1D Power Meters .............................................................23
MD-P1 and MD-P1D Power Meters Single-Phase Connections........................................23
Typical 230V Single-Phase Panel Setup.......................................................................23
Typical 115V Single-Phase Panel Setup.......................................................................23
System Values...............................................................................................................24
Checking Phases................................................................................................................24
Verifying the MD-P1 and MD-P1D Power Meters Setup Using the LEDs ....................24
MD-P1 and MD-P1D Power Meters Wiring Diagrams........................................................25
Supported P1 Applications...................................................................................................30
MD-P1 Point Map by Application Number with Point Map Comparison.............................31
Appendices.............................................................................................................................40
Appendix A - Decimal to Hexadecimal Conversion Table..................................................40
Appendix B - CT Wire Lead Polarity...................................................................................42
Appendix C - MD-P1D with Visual Display.........................................................................43
Appendix D - Monitoring and Servicing the MD-P1 and MD-P1D Model Power Meters....45
ViewPoint Service Software Tool Functionality.............................................................45
Obtaining and Installing ViewPoint Software ................................................................45
Connecting and Communicating via a USB Cable........................................................45
Initial Meter Setup..........................................................................................................46
Appendix E - Installing Firmware Updates for the MD-P1 and MD-P1D Power Meter ......54
Downloading and Installing Firmware ...........................................................................54
Comms Setup Screen ...................................................................................................55
Verifying Installation with ViewPoint Software ..............................................................56
Appendix F - Measuring Consumption (kWh), Demand, and Other Applications..............58
Calculating Total Consumption Example ......................................................................59
Measuring and Calculating Demand (kW).....................................................................64
Trending Data................................................................................................................65
Collecting Energy Data..................................................................................................65

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Peak Demand Limiting ..................................................................................................65
Data Reliability...............................................................................................................68
Power Failure.................................................................................................................68
Appendix G - MD-P1D with Visual Display.........................................................................69
Frequently Asked Questions - FAQs...................................................................................72
Glossary..................................................................................................................................73

Introduction
Product Description
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Introduction
Product Description
The MD-P1 and MD-P1D Power Meters monitor the voltage, current, power, energy
and many other electrical parameters on single and three-phase electrical systems.
The meters use direct connections to each phase of the voltage, and use current
transformers to monitor each phase of the current. Information on energy use,
demand, power factor, line frequency and more are derived from the voltage and
current inputs.
The communications interface to the meters is an RS-485 serial connection that uses
the Siemens P1 FLN protocol for sending commands and retrieving data. An APOGEE
Building Management and Control System is usually connected to the MD-P1 or MD-
P1D Power Meter. This APOGEE system unit provides data recording and trend
logging plus a human interface or display.
Up to 20 MD-P1 or MD-P1D Power Meters may be connected to a single P1 network
for monitoring and recording power usage at multiple locations within a single site.
The MD-P1D Meter, with an integral 2-line × 16 LCD display provides visual feedback
of volts, amps, and Kw, (see Appendix C).
Table 1: Product Numbers
Product Number
MD-P1, MD-P1D Power Meter Bundled Kit Descriptions
MD-P1 Power Meter Bundled Kits; Standard Grade
MD-P1-3-CTSC-100A
Meter with three 100A, split-core current transformers with 1" windows
MD-P1-3-CTSC-200A
Meter with three 200A, split-core current transformers with 1" windows
MD-P1-3-CTSC-400A
Meter with three 400A, split-core current transformers with 1.25" windows
MD-P1-3-CTSC-600A
Meter with three 600A, split-core current transformers with 2" windows
MD-P1-3-RC-16
Meter with three 4000A, 16” Rogowski Coil CTs, with 5" diameter windows
MD-P1-3-RC-36
Meter with three 4000A, 36” Rogowski Coil CTs with 10” diameter windows
MD-P1D Power Meter Bundled Kits; Standard Grade with Display
MD-P1D-3-CTSC-100A
Meter with display, and three 100A, split-core current transformers with 1" windows
MD-P1D-3-CTSC-200A
Meter with display, and three 200A, split-core current transformers with 1" windows
MD-P1D-3-CTSC-400A
Meter with display, and three 400A, split-core current transformers with 1.25" windows
MD-P1D-3-CTSC-600A
Meter with display, and three 600A, split-core current transformers with 2" windows
MD-P1D-3-RC-16
Meter with display, and three 4000A, 16” Rogowski Coil CTs with 5” diameter windows
MD-P1D-3-RC-36
Meter with display, and three 4000A, 36” Rogowski Coil CTs with 10” diameter windows

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Product Description
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MD-P1 Power Meter Bundled Kits; Revenue Grade
MD-P1-3, RGCT-50A
Meter with three 50A, split-core current transformers with 0.5” windows
MD-P1-3, RGCT-100A
Meter with three 100A, split-core current transformers with 1.25” windows
MD-P1-3, RGCT-200A
Meter with three 200A, split-core current transformers with 1.25” windows
MD-P1-3, RGCT-400A
Meter with three 400A, split-core current transformers with 1.25” windows
MD-P1D Power Meter Bundled Kits; Revenue Grade with Display
MD-P1D-3, RGCT-50A
Meter with display and three 50A, split-core current transformers with 0.5” windows
MD-P1D-3, RGCT-100A
Meter with display and three 100A, split-core current transformers with 1.25” windows
MD-P1D-3, RGCT-200A
Meter with display and three 200A, split-core current transformers with 1.25” windows
MD-P1D-3, RGCT-400A
Meter with display and three 400A, split-core current transformers with 1.25” windows
Individual MD-P1 Series Metering Devices (not in a kit, but individually orderable items.
Part Number
Power Meter Individual Devices (Not in a Metering Kit) Descriptions
MD Power Meters ONLY, no CTs included (these must be field configured to selected CT onsite)
MD-P1
Power Meter Only, P1
MD-P1D
Power Meter Only, P1 with Display
Current Transformers (CTs), Split Core Models; Quantity 1
SCT-HSC-0050-U
50A, MINI hinged CT with 0.4” Window
SCT-HMC-0100-U
100A, MIDI hinged CT with 1” window (used in MD-P1x-3-CTSC-100A meter kits)
SCT-HMC-0200-U
200A, MINI hinged CT with 1” window (used in MD-P1x-3-CTSC-200A meter kits)
SCT-SCS-0050-U
50A, Small Split Core CT with 0.75” Window
SCT-SCS-0100-U
100A, Small Split Core CT with 0.75” Window
SCT-SCM-0100-U
100A, Medium Split Core CT with 1.25” Window
SCT-SCM-0200-U
200A, Medium Split Core CT with 1.25” Window
SCT-SCM-0400-U
400A, Medium Split Core CT with 1.25” Window (used in MD-P1x-3-CTSC-400A meter kits)
SCT-SCM-0600-U
600A, Medium Split Core CT with 1.25” Window
SCT-SCL-0600-U
600A, Large Split Core CT with 2” Window (used in MD-P1x3-CTSC-600A meter kits)
SCT-SCL-1000-U
600A, Large Split Core CT with 2” Window

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Product Description
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Current Transformers (CTs), Rogowski Coil Models; Quantity 1
SCT-R16-A4-U
4000A, Rogowski Coil, 16” with 4.5” Window (used in MD-P1x-3-RC-16 meter kits)
SCT-R24-A4-U
4000A, Rogowski Coil, 24” with 7: Window
SCT-R36-A4-U
4000A, Rogowski Coil, 36” with 10.8” Window (used in MD-P1x-3-RC-36 meter kits)
Current Transformers (CTs), Revenue Grade Split Core Models; Quantity 1
SCT-SRS-050-U
50A, Revenue Grade, Small Split Core CT with 0.4” Window
SCT-SRL-100-U
100A, Revenue Grade, Large Split Core CT with 1.25” Window
SCT-SRL-200-U
200A, Revenue Grade, Large Split Core CT with 1.25” Window
SCT-SRL-400-U
400A, Revenue Grade, Large Split Core CT with 1.25” Window
Current Transformers (CTs), Revenue Grade, Toroidal Solid Core Models; Quantity 1
SCT-RGT12-0050-U
50A, Revenue Grade, Toroidal Solid Core CT with 0.5” Window
SCT-RGT12-0100-U
100A, Revenue Grade, Toroidal Solid Core CT with 05” Window
Figure 1: MD-P1 Power Meter
Figure 2: MD-P1D Power Meter with Display

Introduction
Meter Anatomy
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Meter Anatomy
Figure 3: MD-P1D Power Meter with Display
Safety Summary and Specifications
This general safety information must be used by both the Logger operator and
servicing personnel. Siemens Industry, Inc. assumes no liability for user’s failure to
comply with these safety guidelines.
The MD-BMS and MD-BMED Power Meters are Over-Voltage Category III devices.
Use approved rubber gloves with mechanical protection and goggles when operating
these devices.
Conforms to UL Std 61010-1
and IEC61010-2-030
Certified to CSA Std C22.2 No. 61010-1

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Safety Summary and Specifications
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Symbols on Equipment
WARNING
This meter may contain life threatening voltages.
Qualified personnel must disconnect all high voltage wiring before using or servicing
the meter.
CAUTION
Denotes caution.
Equipment damage or loss of data may occur if you do not follow a procedure as
specified. Using this device in a manner for which it is not intended may impair its
means of protection.
WARNING
Shock Hazard
Follow these steps in sequence when connecting the MD BMS and MD-BMED Power
Meters to prevent a shock hazard:
●De-energize the circuit to be monitored.
●Connect the Current Transformers to the phases being monitored.
●Connect the voltage leads to the different phases. Use proper safety equipment
(gloves and protective clothing) as required for the voltages being monitored.
WARNING
Do not exceed 600 Volts
This meter is equipped to monitor loads up to 600V. Exceeding this voltage will cause
damage to the meter and danger to the user. Always use a Potential Transformer
(PT) for loads in excess of 600V. The MD-BMS and MD-BMED Power Meters are 600
Volt Over Voltage Category III devices.
WARNING
DENOTES HIGH VOLTAGE.
RISK OF ELECTRICAL SHOCK. LIFE THREATENING VOLTAGES MAY BE
PRESENT. QUALIFIED PERSONNEL ONLY.
As with any high voltage electrical system, it is imperative that proper personal
protective equipment be worn before inspecting or servicing electrical equipment.
Before inspecting or servicing installed power meters, read and follow the Medium
Risk, NFPA Category 2 PPE requirements (see NFPA 70E, Section 9.1, NFPA 70E
PPE Selection Tables).
WARNING
MD-BMS, MD-BMED hazardous voltages exist.
There are no user-serviceable parts inside. Do not open the enclosure.

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Safety Summary and Specifications
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WARNING
Sensor Limitations
Use only shunted Current Transformers (CTs).
Do not use other CTs. Only use shunted CTs with a 333 mV maximum output.
Serious shock hazard and logger damage can occur if unshunted CTs are used. The
UL listing covers the use of the following Siemens CTs that are UL Recognized and
have been evaluated to IEC 61010-1: SCT-HSC-0050-U (50A Mini), SCT-HMC-0100-
U (100A Midi), SCT-HMC-0200-U (200A Midi),
SCT-RXX-A4-U (Rogowski Coil), SCT-SRS-xxx, SCT-SRL-xxx, and SCT-RGT12-xxx.
NOTE:
Equipment protected throughout by double insulation (IEC 536 Class II).
CAUTION
PS Pulse output
30V maximum open voltage, 5 mA maximum current.
FCC COMPLIANCE
These devices have been tested and found to comply with the limits for a Class A
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference
in which case the user will be required to correct the interference at user’s own
expense.
Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
Sommaire des informations de sécurité
Ces informations de sécurité sont destinées à être utilisées à la fois par l'opérateur de
l'enregistreur et le personnel de service. Siemens Industry, Inc. n'assume aucune
responsabilité en cas non-respect des directives en matière de sécurité par l’utilisateur.
The MD Power Meter est un appareil protégé contre les surtensions de catégorie III.
Conforme à UL Std 61010-1
IEC 6106-2-030
Certifié CSA Std C22.2 No. 61010-1

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Safety Summary and Specifications
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Symboles sur l’appareil
CAUTION
Signifie prudence.
Le dommage d'équipement ou la perte de données peuvent se produire si vous ne
suivez pas de procédure comme spécifié.
WARNING
Indique une haute tension.
Risque de choc électrique. Des tensions mettant en danger la vie des personnes
peuvent être présentes. Personnel qualifié uniquement.
CAUTION
Ce compteur peut contenir des tensions pouvant mettre en danger la vie des
personnes.
Un personnel doit débrancher les câbles de haute tension avant d’utiliser ou de
dépanner le compteur.
WARNING
Ne pas utiliser cet appareil à des fins autres que celles indiquées.
Tout autre utilisation peut annuler ses moyens de protection.
WARNING
Risque d’électrocution
Pour raccorder un MD Model Power Meter à une prise de courant alternatif, suivez
cette séquence pour empêcher tout risque l’électrocution.
●Mettez hors tension le circuit à surveiller.
●Connectez le transformateur de courant aux phases à surveiller.
●Connectez les fils de tension aux différentes phases. Utiliser des équipements de
protection (gants et des vêtements de protection) nécessaires pour les tensions
surveillées.
WARNING
Ne pas dépasser 600 V.
Ce compteur peut contrôler des charges jusqu'à 600 V. Le dépassement de cette
tension peut endommager le compteur et mettre l'utilisateur en danger. Veuillez
toujours utiliser un transformateur de tension pour des charges supérieures à 600 V.
Le MD Power Meter est un appareil à 600 V avec protection contre les surtensions de
catégorie III.

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Safety Summary and Specifications
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DANGER
INDIQUE HAUTE TENSION.
RISQUE DE CHOC ÉLECTRIQUE. HAUTES TENSIONS PEUVENT ÊTRE
PRÉSENTES QUI METTENT LA VIE EN DANGER. PERSONNEL QUALIFIÉ
UNIQUEMENT.
Comme avec tout système électrique haute tension, il est impératif que le personnel
porte des protections adéquates avant d'inspecter ou de dépanner des équipements
électriques. Avant d'inspecter ou de dépanner les wattmètres, veuillez lire et suivre
les exigences de la norme NFPA Catégorie 2 PPE, risque moyen (voir les tables de
sélection NFPA 70E, Section 9.1, NFPA 70E PPE).
DANGER
MD-BMS, MD-BMED tension dangereuse existent.
Il n’y a acune pièce réparaable par l’utilisateur n’ouvrez pas le boîtier.
WARNING
Limites du détecteur
N’utilisez que des transformateurs de tension shuntés.
Ne pas utiliser d’autres transformateurs de tension. N’utilisez que des
transformateurs de tension shuntés d’une puissance maximale 333 mV. De sérieux
risques d’électrocution et des dommages à l'enregistreur peuvent se produire si des
transformateurs de tensions non shuntés sont utilisés. La certification UL couvre
l’utilisation des transformateurs de tension de Siemens agréés UL et évalués sous
IEC 61010-1 suivants :
SCT‐HSC‐0050‐U, SCT‐HMC‐0100‐U, SCT‐HMC‐0200‐U, andSCT-RXX-A4-U.
Équipement protégé par double isolation (IEC 536 Classe II)
CAUTION
Impulsion de sortie PS
Tension ouverte de 30 V maximum, courant maximum de 5 mA.

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Safety Summary and Specifications
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MD Power Meter Technical Specifications
Specification
Description
Service Types
Single Phase, Three Phase-Four Wire (WYE), Three Phase-Three Wire
(Delta)
3 Voltage Channels
80 to 346 Volts AC Line-to-Neutral, 600V Line-to-Line, CAT III
Current Channels (3)
0 to 4,000+ Amps depending on CT. 0.525 Vac maximum
Maximum Current Input
158% of CT rating to maintain accuracy
Measurement Type
True RMS using high-speed digital signal processing (DSP)
Line Frequency
50/60 Hz
Meter Power
From L1 Phase to L2 Phase. 80 to 346 Vac CAT III 50/60 Hz
90 mA maximum. Non-user replaceable 0.5 Amp internal fuse protection.
Waveform Sampling
12 kHz for voltage or current
Channel Sampling Rate
500 milliseconds
Parameter Update Rate
0.5 seconds
Measurements
Volts, Amps, kW, kWh, kVA, kVAR, kVARh, kVAh, Power Factor (PF),
All parameters for each phase and for system total.
Accuracy
0.2% (<0.1% typical) ANSI, C12.20-2010 Class 0.2
Resolution
0.01 Amp, 0.1 Volt, 0.01 watt, 0.01 VAR, 0.01 VA, 0.01 Power Factor
depending on scalar setting
LED Indicators
Bi-color LEDs (red and green): 1 LED to indicate communication, 3 LEDs
for correct CT-to-phase installation. One Digital Channel indicator.
Pulse Output
Open Collector, 5 mA maximum current, 30V maximum open voltage,
optically isolated
Communication
Data Format
P1 FLN over RS-485 Network
Maximum Distance
1200 meters
Baud Rate
4800 baud (fixed, no adjustment)
Data Bits
8
Parity
None
Stop Bit
1
RS 485 Transceiver unit load
size
1/8 Load

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Safety Summary and Specifications
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Mechanical
Operating Temperature
20°F to 140°F (-7°C to 60°C)
Humidity
5% to 95% non-condensing
Enclosure
ABS plastic, 94-V0 flammability rating
Weight
12.0 ounces (340 g), exclusive of CTs
Dimensions
9.5” × 3. 3” × 1.6” (24.2 × 8.5 × 4.0 cm)
Ingress Protection
IP 20
Accessories
Mounting Rail
Compatible with a TS35/7 DIN Rail Channel
Digital Display
An optional 2 × 16 character display which auto-cycles between
informational screens every 2-3 seconds, with real-time values updated
every second.
ViewPoint Minimum System Requirements
Operating System
Windows® 7(32–or 64–bit), Windows® 8 Pro, Vista (32–or 64–bit), XP,
Windows® 10 (32–or 64–bit).
Communications Port
One USB port and Type AB cable
Hard Drive
50 MB minimum available
Processor
Pentium Class 1 GHz or more recommended
Safety
Regulatory Agencies
UL Listed to UL Standard 61010-1 an IEC61010-2-030
cUL certified to CAN/CSA Standard C22.2 No. 61010-1
CE Low Voltage and EMC Directives

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Maintenance
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Maintenance
There is no required maintenance with the MD-P1 or MD-P1D Power Meters.
CAUTION
Do not use cleaning agents of any kind (including water) on the MD-P1 or MD-P1D
Power Meters.
Only accessories specified in Siemens product literature or price sheets are approved
for use with MD-P1 or MD-P1D Power Meters.
If the meter appears damaged or defective:
1. Disconnect all power and sensors.
2. Contact Technical Support for assistance.
Siemens Industry, Inc.
1000 Deerfield Parkway
Buffalo Grove, IL 60089
800-877-7545 (Dial 2)

Installation
Maintenance
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Installation
Figure 4: Power Meter Components and Connections.
WARNING
Remove the meter from all power sources before mounting.

Installation
Mounting the MD-P1 and MD-P1D Power Meters
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Mounting the MD-P1 and MD-P1D Power Meters
The MD-P1 and MD-P1D Power Meters must be installed in an approved electrical
panel or enclosure using proper installation practices according to the NEC and local
electrical codes.
1. To mount the meter, use the two tabs provided at each end of the case or mount
on a 35 mm Top Hat mounting DIN rail (EN 50022).
Figure 5: Mounting Options.
2. Securely mount the meter near a dedicated circuit disconnect breaker.
Connecting the MD-P1 and MD-P1D Power Meters
All wiring added must be rated for 600V CAT III applications.
The MD-P1 and MD-P1D Power Meters have the following wiring connections:
●An RS-485 connection with plus, minus and shield for the P1 network wiring.
●Four connections for voltage sources (L1, L2, L3, and Neutral). These connections
are on the red wiring connector.
The MD-P1 and MD-P1D Power Meters are self-powered from L1 and L2.
–Up to three current transducers (CTs) can be used with the three green 3-input
wiring connectors (one CT per each green connector).
–Digital output port. The port can be used to output kWh, kVARh, or kVAh
pulses to external devices, or to toggle on and off to control a remote device or
relay.
–USB port. This is located on the side of the meter and can be connected to a
PC Service Tool with a USB type AB cable.

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Connecting the MD-P1 and MD-P1D Power Meters
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Figure 6: Power Meter Connections.
Completing the Wiring Connections - RS-485,
Voltage Leads and CTs
WARNING
The FLN cable within electric panels and switchgear should be jacketed, shielded,
twisted triad wire BELDEN 1121A. The jacket insulation rating should be 600V.
DO NOT connect the FLN cable to the field panel yet.
WARNING
At this time, DO NOT connect the FLN cable to the FLN trunk.
Doing so may damage FLN devices or cause personal injury.
1. Mechanically secure the FLN cable where it enters the cabinet or panel. Remove
the black RS-485 connector from the MD-P1 or MD-P1D Power Meter and wire the
FLN cable to the RS-485 connector. Connect positive (+), and negative (-) wires to
the FLN connector using the daisy-chain method (see Figure 6). Keep length of
exposed wire to a minimum.
2. Connect the COMMON wire to the RS-485 connector (S) terminal (see Figure 6).
3. Tape back one of the FLN cable shields and connect the other shield to the Utility
Panel Ground.
4. If the MD-P1 or MD-P1D is the last FLN device, install the end of line terminator on
the positive (+) and negative (-) terminals. See APOGEE Wiring Guidelines for
Field Panels and Equipment Controllers (125-3002) for additional information.
5. Tape or shrink wrap all FLN wire terminations and insulate any other exposed FLN
wiring. Ensure that insulation complies with local and National Electrical Codes.

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Connecting the MD-P1 and MD-P1D Power Meters
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6. Plug the terminal block back into the MD-P1 or MD-P1D Power Meter and
mechanically secure the FLN wire terminations to the power meter to prevent
accidental removal.
Figure 7: Connecting and Insulating FLN Cable on MD-P1/D FLN Connector.
WARNING
Carefully insulate all FLN lines, including shield, to prevent accidental contact to high
voltage conductors.
After wiring FLN cable, remove all scraps of wire or foil shield from electrical utility
panel.
7. Energize the MD-P1 or MD-P1D Power Meter. It is powered through the red power
connector (see wiring connections in Figure 3).
8. Verify proper power meter operation. For normal operation, the RS-485 LED blinks.
9. Close the electric equipment housing.
10. Using a voltmeter, check for high voltage. There should be no significant voltage
(no more than 5V AC or DC) from either FLN leg to ground. If voltage is higher than
5V, check for incorrect wiring.
WARNING
To avoid personal injury or damage to FLN trunk devices, verify no significant voltage
(no more than 5V) exists on the FLN. The MD-P1 and MD-P1D Power Meters are
designed to be located inside high voltage switchgear. They measure electrical use,
and connect directly to the FLN.
11. Insert the CT wires into the green connector/s. See Figure 7.

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Connecting the MD-P1 and MD-P1D Power Meters
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Figure 8: Wiring Connections.
12. Attach the CTs on the power meter's connections labeled CT 1, CT 2 and CT 3.
13. Place the CTs on the phase wires of the load to be monitored and corresponding to
the phase of the voltage leads. The CT labeled CT 1 must be placed on L1 phase
voltage wire; CT 2 must be on the L2 voltage and CT 3 on the L3 voltage. See
Checking Phases for information about the CT LEDs and verifying the CT
installation.
When using the MD-P1 or MD-P1D Model Power Meter with Rogowski Coils (or CTs),
unused CT input(s) should be shorted with a jumper wire if all three coils are not
connected. An unconnected CT input may not show "zero" current due to stray pickup
on the open input.