ICP DAS USA PM-3133-RCT2000P CR User Manual
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ICP DAS USA PM-3133-RCT2000P CR User Manual

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PM-3133-RCT User's Manual v1.05
Last Revised: Apr. 2024
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-3133-RCT User’s Manual v1.05 Last Revised: Apr. 2024 Page: 1  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...
  • Page 2 Revision History The table below shows the revision history: Revision Date Description  1.05 2024/04/25 Fix the Integer type value rage of kVAh,kVARh  Fix the Bi_xxx_kWh modbus address number  Change the Display Voltage definition “automatic” to “default” PM-3133-RCT User’s Manual v1.05 Last Revised: Apr.

  • Page 3: Table Of Contents

    Chapter 1 Introduction ........5 Chapter 4 Wiring Diagrams ......14 1.1. PM-3133-RCT introduction 5 4.1. Connection ...... 14 1.2. Caution ......6 4.2. Wiring ......16 1.2.1. Danger ......6 Chapter 5 Relay output & LED Indicator ..18 1.3.
  • Page 4 Chapter 8 CANopen communication ..... 38 8.2.3.1 Module Control Protocol .. 53 CANopen setting ..... 38 8.2.3.2 Error Control Protocol ..55 CANopen Protocol ..40 8.2.4 Special Functions for PM-3133-CPS ....56 8.2.1 SDO Introduction .... 41 8.2.4.1 Power Meter Data Table .. 56 8.2.1.1 Upload SDO Protocol ..

  • Page 5: Chapter 1 Introduction

    Chapter 1 Introduction 1.1. PM-3133-RCT introduction ICP DAS brings the most powerful, cost-effective, advanced Smart Power Meters PM-3133-RCT that gives you access to real-time electric usage for three-phase power measurement. With its high accuracy (<1%, PF=1; Input Current >50A), this series can be used to both low voltage primary side and 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 6: 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 7: 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-3133-RCT User’s Manual v1.05 Last Revised: Apr. 2024 Page: 7 ...

  • Page 8: Chapter 2 Specifications

    Chapter 2 Specifications 2.1. Specifications Model PM-3133-RCT PM-3133-RCT-MTCP AC Power Measurement Wiring 1P2W-1CT, 1P3W-2CT, 3P3W-2CT, 3P3W-3CT and 3P4W-3CT Measurement Voltage 10 ~ 500 V (CAT III) Measurement Current CTØ 55 mm (500 A), CTØ 80 mm (1000 A), CTØ 105 mm (2000 A) Measurement Frequency 50-60 Hz W Accuracy...
  • Page 9 Aux Power +12 ~ 48 VDC or PoE Input Range +12 ~ 48 VDC PoE Pin Assignments: + (Pin 1, 2), V- (Pin 3, 6) Power Consumption Dimensions (W x L x H) 127 mm x 105 mm x 33 mm Environment Operating Temperature -20 ~ +70 °C Storage Temperature...

  • Page 10: 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 11 Models PM-3133-RCT500P 55.0 68.5 PM-3133-RCT1000P 80.0 93.5 PM-3133-RCT2000P 105.0 118.5  Products come with external split type clip-on CT’s. Disconnect the CT’s or use other CT’s is highly prohibited.  Please read this operation manual carefully before using.  Please re-confirm the measure position. ...

  • Page 12: Mounting And Dismounting 7.2

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

  • Page 13: Positional Accuracy

    3.2.3. Positional Accuracy 1. W Accuracy Better than 1% (PF=1; Input Current >50A; the “A” area). 2. Due to small variations in the winding density and coil cross-sectional area the transducer output varies slightly depending on the position of the current within the coil loop.

  • Page 14: 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 15 Voltage Input PM-3133 series: Input Voltage up to 500V. For any higher Input Voltage large than 500V, 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-3133 series is in mA range.

  • Page 16: Wiring

    4.2. Wiring  1P2W-1CT(PM-3133)  1P3W-2CT(PM-3133)  3P3W-2CT(PM-3133) PM-3133-RCT User’s Manual v1.05 Last Revised: Apr. 2024 Page: 16  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...
  • Page 17  3P3W-3CT(PM-3133) DIP switch: Wiring mode SW 9 SW 10 3P3W-3CT  3P4W-3CT(PM-3133) DIP switch: Wiring mode SW 9 SW 10 3P4W-3CT PM-3133-RCT User’s Manual v1.05 Last Revised: Apr. 2024 Page: 17  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...

  • Page 18: Chapter 5 Relay Output & Led Indicator

    Chapter 5 Relay output & LED Indicator 5.1. Relay Relay type Power Relay, Form A (SPST N.O.) Operating Voltage Range 250 VAC/30 VDC Max. Load Current 5 A at 25 °C Operate Time 6 ms Release Time 3 ms 5.2. LED Indicator The PM-3133 has 4 LED to indicate the unit power status, RS-485 communication, and power data calculation.

  • Page 19: 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 20 PM-3133-RCT User’s Manual v1.05 Last Revised: Apr. 2024 Page: 20  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...
  • Page 21  SW7－SW8 setting PM-3133：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-3133 series. Otherwise, the tM-SG4 or SG-785 should be added to provide the bias.

  • Page 22: 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 23 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 24: Modbus Register

    6.2.2 Modbus Register  Modbus Module #1 – Coil: Relay Value Modbus Register Data Default Parameter name Range Comment Modicom value Type Format 0 = OFF DO 0 04097 0x1000 Word Byte 1 = ON 0 = OFF DO 1 04098 0x1001 Word...
  • Page 25 Re-power the 0x0055: Auto module after Default Frequency 44110 0x100D Word UInt 0x0064: 50Hz 0x0055 setting or 0x0078: 60Hz changing the frequency Energy Absolute 0: Enable 44113 0x1010 Word UInt Accumulated Mode 1: Disable 0: Disable Harmonic Phase 1: Phase A 44114 0x1011 Word...
  • Page 26  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 27  Modbus Module #4 － Input Register :Power value (Float) Modbus Register Parameter Data Type Range Units Comment name Modicom Format Refer to Q9 0x1100- 0x1101 34353-34354 DWord Float Volt 34355- 34356 0x1102- 0x1103 DWord Float 34357- 34358 0x1104- 0x1105 DWord Float kW_a...
  • Page 28 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 29  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 30 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 31  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 32 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 45~65 45~65...

  • Page 33: 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 34: 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-3133-RCT User’s Manual v1.05 Last Revised: Apr. 2024 Page: 34 ...
  • Page 35 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-3133-RCT User’s Manual v1.05 Last Revised: Apr.

  • Page 36: 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 37: Connecting The Power And

    7.3 Connecting the Power and Host PC (without PoE) Power over Ethernet (PoE): The PM-3133-xxx-MTCP module can be powered by an IEEE802.3af compliant PoE switch. Both Ethernet and power can be carried by an Ethernet cable eliminating the need for additional wiring and power supply.

  • Page 38: 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 39 PM-3133-RCT User’s Manual v1.05 Last Revised: Apr. 2024 Page: 39  E-mail: service@icpdas.com Copyright © ICP DAS Co., Ltd. All Rights Reserved. www.icpdas.com...

  • Page 40: Canopen Protocol

     SW7－SW8 setting PM-3133：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-3133-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 41: Sdo Introduction

    8.2.1 SDO Introduction 8.2.1.1 Upload SDO Protocol Initiate SDO Upload Protocol Before transferring the SDO segments, the client and server need to communicate with each other by using the initiate SDO upload protocol. Via the initiate SDO upload protocol, the SDO client will inform the SDO server what object the SDO client wants to request.
  • Page 42 0: normal transfer 1: expedited transfer If the e=1, it means that the data of the object are equal or less than 4 bytes, and only initiate SDO upload protocol is needed. If e=0, the upload SDO segment protocol is necessary. s: size indicator 0: Data set size is not indicated.

  • Page 43: 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 44 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 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-3133-RCT User’s Manual v1.05 Last Revised: Apr. 2024 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: Pdo Communication Rule

    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-3133-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-3133-RCT User’s Manual v1.05 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-3133-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-3133-RCT User’s Manual v1.05 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-3133-Cps

    s: the state of the NMT Slave 4: STOPPED 5: OPERATIONAL 127: PRE_OPERATIONAL 8.2.4 Special Functions for PM-3133-CPS 8.2.4.1 Power Meter Data Table The PM-3133-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-3133-CPS 8.3.1 Communication Profile Area The following tables are regarding each entry of the communication profile area is defined in PM-3133-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-3133-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-3133-CPS boot up.
  • Page 64 Amp(I_c) REAL32 Amp(I_avg) REAL32 3204h largest sub-index supported for UNSIGNED 8 “kvar” kvar(kvar_a) REAL 32 kvar(kvar_b) REAL 32 kvar(kvar_c) REAL 32 kvar(kvar_tot) REAL 32 3205h largest sub-index supported for UNSIGNED 8 “kVA” kVA(Kva_a) REAL 32 kVA(Kva_b) REAL 32 kVA(Kva_c) REAL 32 kVA(Kva_tot) REAL 32 3206h...
  • Page 65 Freq _c REAL 32 Freq _avg REAL 32 Number of entries for “Total 320Ah UNSIGNED 8 Harmonic Distortion” VTHD REAL 32 ITHD REAL 32 Number of entries for “System 320Bh UNSIGNED 8 Parameter Setting” PT Ratio UNSIGNED 16 CT Ratio UNSIGNED 16 Wiring Mode UNSIGNED 8...

  • Page 66: 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. The following table lists the relative objects which will be stored or restored after writing these two objects: Index...

  • Page 67: Appendix 1: Questions & Answers

    Appendix 1: Questions & Answers Q1. If I want to replace the failed CT, can I just detach it? Anything I should pay more attention to? In any circumstance, please make sure the CT had been disconnected with the power cable of monitoring equipments before the CT lines detach from the terminals of the smart meter.
  • Page 68 Q5. 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-3133 series.
  • Page 69 Q8. 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 70 Q9. 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 71 Q11. How to measure the Voltage large than 500V? 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-3133 meter. Selecting a Transformer: Selecting the right voltage transformer is simple. Review the following considerations to determine the best fit for your application.
  • Page 72 Q12. 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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