ICP DAS USA PM-3133i-MTCP User Manual
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ICP DAS USA PM-3133i-MTCP User Manual

Smart power meter
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PM-3133i User's Manual v1.02
Last Revised: Apr. 2023
Page: 1
 E-mail: service@icpdas.com
Copyright © ICP DAS Co., Ltd. All Rights Reserved.
www.icpdas.com

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  • Page 1 PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 1  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...

  • Page 2: Table Of Contents

    Chapter 1 Introduction ........4 Chapter 4 Wiring Diagrams ......13 1.1. PM-3133i introduction ..4 4.1. Connection ...... 13 1.2. Caution ......5 4.2. Wiring ......15 1.2.1. Danger ......5 Chapter 5 LED Indicator ........ 17 1.3. Warning ......5 5.1.
  • Page 3 Chapter 8 CANopen communication ..... 37 8.2.3 NMT Introduction ..... 53 CANopen setting ..... 37 8.2.3.1 Module Control Protocol .. 53 CANopen Protocol ..40 8.2.3.2 Error Control Protocol ..55 8.2.1 SDO Introduction .... 40 8.2.4 Special Functions for PM-3133i-CPS ....

  • Page 4: Chapter 1 Introduction

    Chapter 1 Introduction 1.1. PM-3133i introduction ICP DAS brings the most powerful, cost-effective, advanced Smart Power Meters PM-3133i series that gives you access to real-time electric usage for three-phase power measurement. With its high accuracy (<0.5%, PF=1 ), the PM-3133i series can be applied to both low voltage primary side and/or medium/high voltage secondary side and enables the users to obtain reliable and accurate energy consumption readings from the monitored equipments in real time under operation.

  • Page 5: Caution

    1.2. Caution 1.2.1. Danger The meter contains hazardous voltages, and should never be disassembled. Failing to follow this practice will result in serious injury or death. Any work on or near energized meters, meter sockets, or other metering equipment could induce a danger of electrical shock.

  • Page 6: Limitation Of Warranty

    1.4.1. Limitation of Warranty This warranty does not apply to defects resulting from unauthorized modification, misuse, or use for reason other than electrical power monitoring. The supplied meter is not a user-serviceable product. PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 6 ...

  • Page 7: Chapter 2 Specifications

    Chapter 2 Specifications 2.1. Specifications Model PM-3133i PM-3133i-MTCP AC Power Measurement Wiring 1P2W-1CT, 1P3W-2CT, 3P3W-2CT, 3P3W-3CT and 3P4W-3CT Measurement Voltage 10 ~ 600 V (CAT III) CTØ 10 mm (0.05 A~60 A); CTØ 16 mm (0.1 A~100 A); Measurement Current CTØ...
  • Page 8 Aux Power Input Range +12 ~ 48 VDC Power Consumption Dimensions (W x L x H) 127 mm x 105 mm x 33 mm Environment Operating Temperature -20 ~ +70 °C Storage Temperature -40 ~ +80 °C Field Wiring Terminal Markings: 3.81mm (For Measurement Current and Communication): Use Copper Conductors Only, wires range 16-26 AWG, torque value 3.0 lb-in.

  • Page 9: Chapter 3 Installation

    Chapter 3 Installation 3.1. Inspection The instrument is no longer safe when, a) Shows clear signs of damage b) Does not work c) Long storage under extreme conditions d) Damage during shipment 3.2. Safety Please use the soft dry clothes to clean the instrument. Please do not use any chemical or detergent or volatile solvents to clean the instrument, in order to avoid any possibility of the cover damage.

  • Page 10: Dimension And Latch

    3.3. Dimension and Latch PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 10  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...

  • Page 11: Mounting And Dismounting 7.2.1

    3.3.1. Mounting and Dismounting  Mounting Assembly: Place the PM-3133i on the DIN-Rail. Push the front of the PM-3133i toward the mounting surface until it audibly snaps into place. Dismantling: Pull out the latch and then remove the PM-3133i from the DIN-rail ...

  • Page 12: Ct's Installation Steps

    3.3.2. CT’s installation steps  At the bottom of the CT, there is a “K→L” mark.  Open the CT clip.  Make sure the power current  Installation steps finished. direction follow the “K→L” mark on the CT and then close the CT clip. PM-3133i User’s Manual v1.02 Last Revised: Apr.

  • Page 13: Chapter 4 Wiring Diagrams

    Chapter 4 Wiring Diagrams 4.1. Connection Please firstly check the current input terminal, and then in white black, white black, white black wire sequences (CT1-K, CT1-L, CT2-K, CT2-L,CT3-K,CT3-L). Then connect the CT’s, and close the CT clip. Make sure the arrow direction sign on CT’s follows current flow direction（K→L）...
  • Page 14 Voltage Input PM-3133i series: Input Voltage up to 600V. For any higher Input Voltage large than 600V, please add the PT (power transformer), and Change PT RATIO setup. Confirm the RST (ABC) phase sequence. Current Input The external CT’s are fragile, please handle with care. The current input of PM-3133i series is in mA range.

  • Page 15: Wiring

    4.2. Wiring  1P2W-1CT(PM-3133i)  1P3W-2CT(PM-3133i)  3P3W-2CT(PM-3133i) PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 15  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...
  • Page 16  3P3W-3CT(PM-3133i) DIP switch: Wiring mode SW 9 SW 10 3P3W-3CT  3P4W-3CT(PM-3133i) DIP switch: Wiring mode SW 9 SW 10 3P4W-3CT PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 16  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...

  • Page 17: Chapter 5 Led Indicator

    Chapter 5 LED Indicator 5.1. LED Indicator The PM-3133i has 2 LED to indicate the unit power status, communication, and power data calculation.  RUN: Green, light up after communication ready. LED will flash when the unit is processing RS-485 communication. ...

  • Page 18: Chapter 6 Modbus-Rtu Communication

    Chapter 6 Modbus-RTU Communication 6.1 RS-485 setting  Default setting for RS-485: 19200, n, 8, 1  DIP switch (SW1-SW6) is used for Modbus address setting, default is 1, i.e. all OFF For example: Modbus address is 10，find the table of DIP switch 1-6 is ON, OFF, OFF, ON, OFF, OFF 6.1.1 SW1－SW6 setting Setting Modbus-RTU address for communication (1-64)
  • Page 19 PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 19  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...
  • Page 20  SW7－SW8 setting PM-3133i：For Baud Rate Setting Baud Rate SW 7 9600 bps 19200 bps (Default) 38400 bps 115200 bps Add the Bias Resistor on RS-485 Network for stable signal The RS-485 master is required to provide the bias for PM-3133i series. Otherwise, the tM-SG4 or SG-785 should be added to provide the bias.

  • Page 21: Modbus-Rtu Setting

    6.2 Modbus-RTU setting 6.2.1 Specifications Protocol Modbus-RTU Transmission Bits per Byte： Specifications 1 start bit 8 data bits, least significant bit sent first None Parity 1 stop bits Error Check： Cyclical Redundancy Check (CRC) Baud Rate 9600, 19200 (Default), 38400, 115200 Modbus slave address 1-64 (Default = 1) ...
  • Page 22 IEEE 754 Format Definition of the floating format of the Bits Data Hi Word， Data Hi Word， Data Lo Word， Data Lo Word， Hi Byte Lo Byte Hi Byte Lo Byte SEEE EEEE EMMM MMMM MMMM MMMM MMMM MMMM E -127 Value = (- 1) x (1.M) x 2 0 <...

  • Page 23: Modbus Register

    6.2.2 Modbus Register  Modbus Module #1 –Coil: Relay Value: N/A  Modbus Module #2 – Holding Register : System Parameter Setting Modbus Register Data Default Parameter name Range Units Comment Modicom Type value Format 0: None Only work for Parity 44098 0x1001...
  • Page 24 0: Disable Harmonic Phase 1: Phase A 44114 0x1011 Word UInt Select 2: Phase B 3: Phase C 0: Automatic Refer to Q12 Display Voltage 44115 0x1012 Word UInt 1: Show as Vln 2: Show as Vll PM-3133i User’s Manual v1.02 Last Revised: Apr.
  • Page 25  Modbus Module #3 － Input Register : System Information Modbus Register Data Default Parameter name Range Units Comment Modicom Type value Format 9: 1P2W (HW)： set 10: 1P3W wiring by 11: 3P3W2CT hardware Dip 12: 3P3W3CT Switch 13: 3P4W 14: 3P3W2CT Wiring Type 30513...
  • Page 26  Modbus Module #4 － Input Register :Power value (Float) Modbus Register Parameter Data Type Range Units Comment name Modicom Format Refer to Q12 0x1100- 0x1101 34353-34354 DWord Float Volt 34355- 34356 0x1102- 0x1103 DWord Float 34357- 34358 0x1104- 0x1105 DWord Float kW_a...
  • Page 27 34417-34418 0x1140-0x1141 PF_tot DWord Float 34419-34420 0x1142-0x1143 kWh_tot DWord Float 34421-34422 0x1144-0x1145 kvarh_tot DWord Float 34423-34424 0x1146-0x1147 kVAh_tot DWord Float 34425-34426 0x1148-0x1149 Freq_a DWord Float 45~65 34427-34428 0x114A-0x114B Freq_b DWord Float 45~65 34429-34430 0x114C-0x114D Freq_c DWord Float 45~65 34431-34432 0x114E-0x114F Freq_max DWord Float...
  • Page 28  Modbus Module #5 － Input Register :Power value (Inverse Integer) Modbus Register Parameter Data Range Units Comment name Type Modicom Format 34609- 34610 0x1200-0x1201 DWord UInt32 0.1 Volt 34611- 34612 0x1202-0x1203 DWord UInt32 0.1A 34613- 34614 0x1204-0x1205 kW_a DWord Int32 0.1kW 34615- 34616...
  • Page 29 34668-34669 0x123B-0x123C kVA_tot DWord Int32 0.1kVA 34670 0x123D PF_tot Word 0~1000 0.001PF 0~1.000 34671-34672 0x123E-0x123F kWh_tot DWord Int32 ±0~99999999 0.1kWh ±0~9999999.9 34673-34674 0x1240-0x1241 kvarh_tot DWord Int32 0~99999999 0.1kvarh 0~9999999.9 34675-34676 0x1242-0x1243 kVAh_tot DWord Int32 ±0~99999999 0.1kVAh ±0~9999999.9 34677 0x1244 Freq_a Word 45~65 45~65...
  • Page 30  Modbus Module #6 － Input Register :Power value (Integer) Modbus Register Parameter Data Range Units Comment name Type Modicom Format 34865- 34866 0x1300- 0x1301 DWord UInt32 0.1 Volt 34867- 34868 0x1302- 0x1303 DWord UInt32 0.1A 34869- 34870 0x1304- 0x1305 kW_a DWord Int32...
  • Page 31 34924- 34925 0x133B- 0x133C kVA_tot DWord Int32 0.1kVA 34926 0x133D PF_tot Word 0~1000 0.001PF 0~1.000 34927-34928 0x133E-0x133F kWh_tot DWord Int32 ±0~99999999 0.1kWh ±0~9999999.9 34929-34930 0x1340-0x1341 kvarh_tot DWord Int32 0~99999999 0.1kvarh 0~9999999.9 34931-34932 0x1342-0x1343 kVAh_tot DWord Int32 ±0~99999999 0.1kVAh ±0~9999999.9 34933 0x1344 Freq_a Word...

  • Page 32: Chapter 7 Modbus-Tcp Communication

    Chapter 7 Modbus-TCP Communication 7.1 Default settings Ethernet default settings： IP Address 192.168.255.1 Subnet mask 255.255.0.0 Gateway 192.168.0.1 Port For recovering to default settings, dip Init/Run Switch (SW 4) to Init position for 10 seconds after power on, the settings will be changed as default values. Must dip back to Run position and repower on after settings changed.

  • Page 33: Ethernet Configurations

    7.1.1 Ethernet configurations In the Power Meter Utility, please select “Modbus TCP” in the Communication Interface. Click “Search” to enter the “Communication Interface Setting” window. Click ”Search” button to search the available power meter. PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 33 ...
  • Page 34 Select the power meter which you want to modify parameters from the meter list, then click ”Configuration” button to setup the meter parameters. After complete all setting, click “OK”, and return to the meter list windows. PM-3133i User’s Manual v1.02 Last Revised: Apr.

  • Page 35: Specifications

    7.2 Specifications Modbus-TCP structure Byte 00~05 Byte 06~11 6-byte header RTU Data Modbus-TCP( Byte 00~05) Byte 00 Byte 01 Byte 02 Byte 03 Byte 04 Byte 05 Transaction identifier Protocol identifier Data length Data length upper byte lower byte Transaction identifier = Assign by Modbus/TCP Master (Client) Protocol identifier = 0 Data length (upper byte) = 0 Data length (lower byte) = Depend on the number of the RTU Data bytes...

  • Page 36: Connecting The Power And

    7.3 Connecting the Power and Host PC (without PoE) PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 36  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...

  • Page 37: Chapter 8 Canopen Communication

    Chapter 8 CANopen communication 8.1 CANopen setting  Default setting for CANopen: Baud rate:125 K b.p.s. , Node ID:1  DIP switch (SW1-SW6) is used for Node ID setting, default is 1, i.e. all OFF For example: Node ID is 10，find the table of DIP switch 1-6 is ON, OFF, OFF, ON, OFF, OFF SW1－SW6 setting ...
  • Page 38 PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 38  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...
  • Page 39  SW7－SW8 setting PM-3133i：For CANopen Baud Rate Setting Baud Rate SW 7 125 K bps(Default) 250 K bps 500 K bps 1M bps  SW9－SW10 setting PM-3133i-CPS：Select the different wiring mode (Please select the Software setting, if 1P2W-1CT or 1P3W-2CT is used) Wiring SW 9 SW 10...

  • Page 40: Canopen Protocol

    8.2 CANopen Protocol The CANopen is a kind of network protocols evolving from the CAN bus, used on car control system in early days, and has been greatly used in various applications, such as vehicles, industrial machines, building automation, medical devices, maritime applications, restaurant appliances, laboratory equipment &...
  • Page 41 scs: server command specified 2: initiate upload response n : Only valid if e = 1 and s = 1, otherwise 0. If valid, it indicates the number of bytes in d that do not contain data. Bytes [8-n, 7] do not contain segment data.

  • Page 42: Download Sdo Protocol

    ccs: client command specified 3: upload segment request scs: server command specified 0: upload segment response t: toggle bit. This bit must alternate for each subsequence segment that is uploaded. The first segment will have the toggle bit set to 0. The toggle bit will be equal for the request and response message.
  • Page 43 ccs: client command specified 1: initiate download request scs: server command specified 3: initiate download response n: Only valid if e = 1 and s = 1, otherwise 0. If valid, it indicates the number of bytes in d that do not contain data. Bytes [8-n, 7] do not contain segment data.
  • Page 44 x: not used, always 0 reserved: reserved for further use , always 0 PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 44  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...
  • Page 45 Download Segment Protocol ccs: client command specified 0: download segment request scs: server command specified 1: download segment response seg-data: It is at most 7 bytes of segment data to be downloaded. The encoding depends on the type of the data referenced by index and sub-index. n: It indicates the number of bytes in seg-data that do not contain segment data.

  • Page 46: Abort Sdo Transfer Protocol

    8.2.1.3 Abort SDO Transfer Protocol In some conditions, the SDO client or SDO server will terminate the SDO transmission. For example, the value of entries that users want to modify does not exist or is read-only, even users wouldn’t continue the uncompleted SDO protocol under some special situations.
  • Page 47 Abort Code Description 0503 0000h Toggle bit not alternated. 0504 0000h SDO protocol timed out. 0504 0001h Client/server command specified not valid or unknown. 0504 0002h Invalid block size (block mode only). 0504 0003h Invalid sequence number (block mode only). 0504 0004h CRC error (block mode only).
  • Page 48 generation fails because of an file error). PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 48  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...

  • Page 49: Pdo Introduction

    8.2.2 PDO Introduction 8.2.2.1 PDO COB-ID Parameters Before the real-time data are transmitted by the PDO, it is necessary to check the COB-ID parameter of this PDO in the PDO communication objects. This parameter setting controls the COB-ID of the PDO communication, which is in 32 bits, and each bit with its meaning is given in the table follow.

  • Page 50: Transmission Type

    Note: 1. Users can also define the PDO COB-ID by themselves. Actually, all COB-ID can be defined by users except the reserved COB-ID described in the table of the section 3.1. It is important to avoid the conflict with the defined COB-ID used in the same node.
  • Page 51 The PDO, including the DI value, will be sent when the DI value is changed. And both transmission types will directly trigger an update of the mapped data when receiving the RxPDO.  The PM-3133i-CPS doesn’t support RxPDO. 8.2.2.3 PDO Communication Rule The PDO related objects are indicated from index 0x1400 to 0x1BFF.
  • Page 52 COB-ID: the default PDO COB-ID, or the PDO COB-ID defined by users L: the data length about how many bytes the PDO message has PDO-msg: the real-time data or the data which can be mapped into the PDO mapping objects PM-3133i User’s Manual v1.02 Last Revised: Apr.

  • Page 53: Nmt Introduction

    8.2.3 NMT Introduction 8.2.3.1 Module Control Protocol The NMT communication set can be applied for changing the NMT slave status. The following figure shows how to change the different NMT statuses for the PM-3133i-CPS. Start Remote Node Protocol cs: NMT command specified 1: start Node ID: the node ID of the NMT slave device Stop Remote Node Protocol...
  • Page 54 Enter Pre-Operational Protocol cs: NMT command specified 128: enter PRE-OPERATIONAL Node ID: the node ID of the NMT slave device Reset Node Protocol cs : NMT command specified 129: Reset_Node Node ID : the node ID of the NMT slave device PM-3133i User’s Manual v1.02 Last Revised: Apr.

  • Page 55: Error Control Protocol

    Reset Communication Protocol cs: NMT command specified 130: Reset_Communication Node ID: the node ID of the NMT slave device 8.2.3.2 Error Control Protocol Error Control Protocol is a kind of the solution to check whether the CANopen device is still alive or not. And its related objects include 0x100C and 0x100D. The 0x100C is the guard time, and the 0x100D is the life time factor.

  • Page 56: Pm-3133I-Cps

    s: the state of the NMT Slave 4: STOPPED 5: OPERATIONAL 127: PRE_OPERATIONAL 8.2.4 Special Functions for PM-3133i-CPS 8.2.4.1 Power Meter Data Table The PM-3133i-CPS Manufacturer in the Specific Profile Area defines some entries, which are used for the power meter data. The objects with index 0x3200~0x3208 will map to the PDOs as below table.

  • Page 57: Object Dictionary Of

    8.3 Object Dictionary of PM-3133i-CPS 8.3.1 Communication Profile Area The following tables are regarding each entry of the communication profile area is defined in PM-3133i-CPS. For the convenient purpose, all communication entries are divided into several tables. They are “General Communication Entries”, “TxPDO Communication Entries”, and “TxPDO Mapping Communication Entries”.
  • Page 58 SDO Communication Entries Sidx Description Type Attr Default 1200h 0h largest sub-index supported UNSIGNED 8 RO 2 for “server SDO parameter” COB-ID form client to server UNSIGNED 32 RO 600h+Node-ID (RxSDO) COB-ID form server to clien UNSIGNED 32 RO 580h+Node-ID t(TxSDO) TxPDO Communication Entries Sidx Description...
  • Page 59 inhibit time UNSIGNED 16 … … … Reversed event timer UNSIGNED 16 1804h largest sub-index supported UNSIGNED 8 for “receive PDO parameter” COB-ID used by PDO (Tx) UNSIGNED 32 80000000h transmission type UNSIGNED 8 inhibit time UNSIGNED 16 … … …...
  • Page 60 mapping” read Kw_c data INTEGER 32 3200 0320h read kWh_c data INTEGER 32 3201 0320h 1A03h largest sub-index UNSIGNED 8 supported for “transmit PDO mapping” read Kw_tot data INTEGER 32 3200 0420h read kWh_tot data INTEGER 32 3201 0420h 1A04h largest sub-index UNSIGNED 8 supported for...
  • Page 61 mapping” read kvar(kvar_a) INTEGER 32 3204 0120h data read kVA(Kva_a) INTEGER 32 3205 0120h data 1A09h largest sub-index UNSIGNED 8 supported for “transmit PDO mapping” read kvar(kvar_b) INTEGER 32 3204 0220h data read kVA(Kva_b) INTEGER 32 3205 0220h data 1A0Ah 0 largest sub-index UNSIGNED 8 supported for...
  • Page 62 1A0Eh 0 largest sub-index UNSIGNED 8 supported for “transmit PDO mapping” read PF_c data INTEGER 32 3206 0320h read kVAh_c data INTEGER 32 3207 0320h 1A0Fh 0 largest sub-index UNSIGNED 8 supported for “transmit PDO mapping” read PF_tot data INTEGER 32 3206 0420h read kVAh_tot data INTEGER 32...

  • Page 63: Profile Area

    read Freq_avg data INTEGER 32 3209 0420h 8.3.2 Manufacturer Specific Profile Area In the following table, there is information about some special functions for the PM-3133i-CPS. The index from 0x3200 to 0x3209 records the power meter measurement parameters. The number of these entries will be automatically updated when the PM-3133i-CPS boot up.

  • Page 64: Amp(I_Avg)

    Amp(I_c) INTEGER32 Amp(I_avg) INTEGER32 3204h largest sub-index supported for UNSIGNED 8 “kvar” kvar(kvar_a) INTEGER32 kvar(kvar_b) INTEGER32 kvar(kvar_c) INTEGER32 kvar(kvar_tot) INTEGER32 3205h largest sub-index supported for UNSIGNED 8 “kVA” kVA(Kva_a) INTEGER32 kVA(Kva_b) INTEGER32 kVA(Kva_c) INTEGER32 kVA(Kva_tot) INTEGER32 3206h largest sub-index supported for UNSIGNED 8 “PF”...
  • Page 65 Freq _c INTEGER32 Freq _avg INTEGER32 320Ah largest sub-index supported for UNSIGNED 8 object PT Ratio UNSIGNED 16 RW CT Ratio UNSIGNED 16 RW PM-3133i User’s Manual v1.02 Last Revised: Apr. 2023 Page: 65  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...
  • Page 66 Software Wiring UNSIGNED 8 (Only work when SW9-SW10 is all off) (1: 1P2W 2: 1P3W 3P3W2CT 3P3W3CT 3P4W3CT) 320Bh largest sub-index supported for UNSIGNED 8 object Set Energy to Zero UNSIGNED 16 RW 0x0055 Reset to Factory Settings UNSIGNED 16 RW 0x0055 Default Frequency UNSIGNED 16 RW...

  • Page 67: Application Object

    8.3.3 Application Object The users can write the object the value 65766173h to object with index 1010h and subindex 1 to save the application setting, or write the value 64616F6Ch to object with index 1011h and subindex 1 and reboot the module to load the factory default. PM-3133i User’s Manual v1.02 Last Revised: Apr.

  • Page 68: Appendix 1: Questions & Answers

    Appendix 1: Questions & Answers Q1. Can we use the other 5A CT’s (like 300/5) to directly connect to the input current terminals of PM-3133i series? No, because the input current is only mA size on PM-3133i series，definitely not to directly use other 5A CT’s to connect and apply （like100/5…）...
  • Page 69 Q6. PC and meter cannot make the connection with RS-485？ (1) Confirm the Modbus Address, default is 1. (2) Confirm the Band Rate, default is 19200. (3) Confirm the stop bit, default is 1. (4) Confirm the RS-485 connection, make sure the D+/D- is right. (5) Confirm the RS-485 master have to provide the bias for PM-3133i series.
  • Page 70 Q9. How to measure the current large than 400A? The CT of PM-3133i maximum range is 400A. If the target is more than 400A, we suggest the solution as follow. For example the target is to measure maximum 800A current. We can measure big CT output and set a CT Ratio.
  • Page 71 Q10. Can I use CT's that I currently own with PM-3133i Power Meter? You can use CT's that you currently own with PM-3133P (without CTs) Power Meter. The CT inputs of the PM-3133P can handle a maximum of 333mV (Rogowski coils are not supported) of AC current.
  • Page 72 Q11. What is the difference between line to line voltages to line to ground voltage? On a three phase wye connected system line to line voltages will be the voltages between the terminals A - B, B - C, A - C. On a three phase wye connected system line to ground voltages will be the voltages between the terminals A - N, B - N, C - N.
  • Page 73 Q12. How to set up [Display Voltage] register value to correctly display line to ground voltage or line to line voltage? The voltage [V_x] register in Modbus register table can be used to show line-to-ground voltage or line-to-line voltage value by setting [Display Voltage] register value. According to different wiring types, it is required to set different [Display Voltage] value.
  • Page 74 Q14. How to measure the Voltage large than 600V? For service voltage above 600 Vac, voltage transformers (PTs) are used to step down the voltage to a lower range that will work with a PM-3133i meter. Selecting a Transformer: Selecting the right voltage transformer is simple. Review the following considerations to determine the best fit for your application.
  • Page 75 Q15. The Power Meter can be connected to a remote display (via RS-485). A: Power Meter can be connected to VPD-13x or VPD-14x series via RS-485: B: Two Masters Share One Slave (via tSH-735): This function allows two master devices connected to different serial ports to share slave devices.

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