Lovato DMG7000 to DMG9000

Compatibility

Compatible with EpiSensor Edge over Modbus TCP or Modbus RTU

The DMG7500, DMG8000 and DMG9000 are compatible with EpiSensor Edge over Modbus RTU on the built-in RS-485 port (DMG7500, DMG9000), read through a ZMB-31 Modbus Interface or a Gateway serial port, and over Modbus TCP on port 502 of the built-in Ethernet port (DMG8000, DMG9000). Lovato publishes one register map with addresses, word counts, units and formats for read functions 03 and 04, and states big-endian word order.

DMG7000, DMG7500, DMG8000 and DMG9000, read with Modbus manual I676IGB10_25 and instruction manual I674IGB09_26. The DMG7000 has no built-in port and needs an EXP communication module; the DMG7501 speaks BACnet MS/TP only on its built-in port and is outside this guide. Energy totals are four-register counters that Edge's Modbus client does not read. Site check: read L1 phase voltage at table address 0x0002 and compare it with the display. Read-only monitoring: no writes to parameters, commands, the clock or remote variables.

Connect it with

• Modbus Interface ZMB-3X From €399 ex VAT Configure
• Gateway ZGW-20 From €899 ex VAT Configure
• Evaluation Gateway on a Raspberry Pi Edge with one device licensed Free Set up

Models

Specifications

The DMG7000 to DMG9000 suit a switchboard door with a standard 92 x 92 mm cut-out where a colour display and remote readings are wanted. They are three-phase analysers for systems with or without neutral, read through external CTs, and take up to three EXP modules for communication, digital and analog I/O.²

Order codes

DMG7000 (EAN 8013975271391), DMG7500 (8013975271407), DMG8000 (8013975271414) and DMG9000 (8013975271421); DMG9000D048 for a 12 to 48 VDC supply.^2, 3, 4

Built-in ports

DMG7000 none; DMG7500 RS-485 (COM1); DMG7501 BACnet MS/TP (COM1); DMG8000 Ethernet (COM1); DMG9000 RS-485 (COM1) and Ethernet (COM2). Up to three independent COM ports with EXP modules.²

Modbus settings (M07)

Node address 1 to 255 (default 1); 1200 to 115200 bit/s (default 9600); 8 bits with no, odd or even parity, or 7 bits for ASCII; one or two stop bits; Modbus RTU (default), ASCII or TCP; IP address 192.168.1.1, subnet 255.255.255.000 and port 502 from the factory.²

Modbus TCP sessions

At most two clients at the same time on the built-in Ethernet port.^1, 2

Voltage inputs

600 V phase to phase (347 V phase to neutral) maximum rated; measuring range 40 to 830 V phase to phase and 5 to 480 V phase to neutral; 45 to 66 Hz and 360 to 440 Hz.²

Current inputs

External CTs with 5 A or 1 A secondary, measuring range 0.004 to 6 A. Six CT terminals, eight on the DMG9000 for the neutral CT.²

Accuracy

Voltage and current class 0.2 (IEC/EN 61557-12); active power class 0.5; active energy class 0.5S (IEC/EN 62053-22); reactive energy class 1 (IEC/EN 62053-24); frequency class 0.02. Classification PMD/SD/K70/0,5.^2, 3

Auxiliary supply

100 to 240 VAC or 110 to 250 VDC, 15 VA or 6 W; DMG9000D048 12 to 48 VDC, 11 W.²

Housing

Panel mount, 92 x 92 mm cut-out to IEC 61554, 118 x 96 mm front; IP65 at the front with gasket, IP20 at the housing and terminals.²

Environment

Operating -20 to +60 °C, storage -30 to +80 °C, relative humidity below 80%.²

Certifications

CE, UKCA, EAC and cETLus. Manual I674IGB09_26 does not yet show cETLus as granted for the DMG9000D048.²

Interface

Documented measurements and integration boundaries for DMG7000 to DMG9000.

• Addresses are the table addresses printed by Lovato in hex. Send each one minus one: the manual's own examples send 0x28F9 for the register it lists at 0x28FA, and 0x4FFF for 0x5000. Read with function 03 or 04, at most 120 registers per request.
• Byte and word order are big-endian: high word first and high byte first. Two-register values are 32-bit, signed or unsigned as the format column says.
• Phase voltages L1, L2 and L3 at 0x0002, 0x0004 and 0x0006 and line voltages L1-L2, L2-L3 and L3-L1 at 0x000E, 0x0010 and 0x0012: unsigned 32-bit, V/100.
• Phase currents at 0x0008, 0x000A and 0x000C: unsigned 32-bit, A/10000. The calculated neutral current is at 0x00D6; on the DMG9000 the current from the fourth CT is at 0x006C and the neutral voltage V4-N at 0x006A.
• Phase active power at 0x0014, 0x0016 and 0x0018 and total (equivalent) active power at 0x003A: signed 32-bit in kW/100000, so one count is 0.01 W. Reactive power from 0x001A and total at 0x003C in kvar/100000 (signed); apparent power from 0x0020 and total at 0x003E in kVA/100000 (unsigned).
• Phase power factor at 0x0026, 0x0028 and 0x002A and total power factor at 0x0040: signed 32-bit, divide by 10000.
• Frequency at 0x0032: unsigned 32-bit, Hz/1000. Voltage and current unbalance at 0x0042 to 0x0046 and THD of voltage at 0x0054 to 0x0058 and current at 0x005A to 0x005E, in %/100.
• Maximum values start at 0x0400 and minimum values at 0x0600, in the same units. Hour counters are at 0x1E00 to 0x1E06 (unsigned 32-bit, seconds) and the serial number at 0x1FF0.
• Energy totals at 0x1B20 (active import), 0x1B24 (active export), 0x1B28 and 0x1B2C (reactive import and export) and 0x1B30 (apparent), the partial counters from 0x1B34, the tariff counters from 0x1B48 and the per-phase counters from 0x1B98 take four registers each in kWh/100. Edge's Modbus client reads 16- and 32-bit values only, so it does not read them; take energy from an EpiSensor meter on the same feeder.
• EASY BRANCH points (EXS4000 or EXS4001 modules behind a DMG7500, DMG7501, DMG8000 or DMG9000) answer as their own Modbus nodes, 2, 3, 4 and so on from the factory, with the rows marked for EXS4 in the same map.
• Writes: parameters through 0x5000 to 0x5004, commands at 0x2FF0 and 0x2F03 (function 06), the clock at 0x28F0 and remote variables at 0x4F00. Keep all of them out of a monitoring poll.

Setup

1. Identify the model and its ports

   Read the model on the system information page. A DMG8000 or DMG9000 has an RJ45 port, a DMG7500 or DMG9000 has RS-485 terminals A, B and SG, and a DMG7000 has neither. If your tool supports function 17 (Report slave ID), the model code is 0x70 (DMG7000), 0x75 (DMG7500), 0x80 (DMG8000) or 0x90 (DMG9000).

2. Check CT, VT and wiring settings

   Compare menu M01 with the installation: CT primary and secondary, VT use and ratio, and the wiring type. Run the wiring test on a loaded circuit to catch phase sequence and CT polarity errors before readings are collected.

3. Check the remote password

   Look at P03.04 in menu M03. Lovato describes it as a code that must be entered first before the communication interface gives access to settings, commands and measurements; it is off from the factory. Agree with the site owner that it stays off on the channel Edge reads, because Edge does not write it.

4. Set the communication channel

   In menu M07 open the COM channel you will use. For Ethernet choose Modbus TCP, set the site IP address, subnet mask and gateway and keep port 502. For RS-485 keep Modbus RTU and copy the node address, speed, data format and stop bits into Edge or the ZMB-31.

5. Start with the voltage read

   Read L1 phase voltage with the example below and compare it with the display. Then add currents, power in kW/100000, power factor and frequency, checking each against the matching display page.

Common questions

Why send 0x0001 for L1 voltage when the map says 0x0002?

Lovato's examples in the same manual send the listed address minus one: the clock is applied at 0x28FA with a frame addressed to 0x28F9, and parameter selection at 0x5000 with a frame addressed to 0x4FFF. A client that asks for one-based register numbers takes the table value; one that sends the raw address takes the table value minus one.¹

Why is power in kW/100000?

The DMG7000 to DMG9000 map gives active, reactive and apparent power in kW/100000, kvar/100000 and kVA/100000. One count is 0.01 W, the same resolution as the W/100 rows of earlier DMG meters, but expressed in kilowatts. Divide the signed 32-bit value by 100000 for kW.¹

Can Edge read the energy counters?

Not from this map. Every energy row from 0x1B20 is four registers long, and Edge's Modbus client reads 16- and 32-bit values only. Read power, voltage, current and quality values from the DMG and take energy totals from an EpiSensor meter on the same feeder.¹

Does the DMG7501 work with Edge?

Not on its built-in port, which runs BACnet MS/TP. The DMG7500 is the version with a built-in RS-485 Modbus port, and the DMG8000 and DMG9000 add Ethernet with Modbus TCP.²

How many systems can poll a DMG9000 over Ethernet?

Lovato states a maximum of two Modbus TCP connections on the built-in Ethernet port of the DMG8000 and DMG9000. If two clients already hold connections, Edge cannot add a third; use the RS-485 port on a DMG9000 or the gateway function between its ports instead.^1, 2