Carlo Gavazzi EM24-DIN

Compatibility

Compatible with EpiSensor Edge over Modbus RTU.

Connect its RS-485 port to a Modbus Interface or to a serial interface on the Gateway. Edge polls it with its Modbus client.

Edge reads 32 values from it, listed under Interface.

Connect it with

• 
  Modbus Interface ZMB-3X
  From €399 ex VAT Configure Modbus Interface
• 
  Gateway ZGW-20
  From €899 ex VAT Configure Gateway

Specifications

The EM24-DIN is a three-phase energy analyser in a 4-module DIN-rail housing, with a joystick and LCD for local readout and set-up. Carlo Gavazzi builds it for active and reactive energy metering and for cost allocation. It measures phase and system voltage, current, active, apparent and reactive power, power factor and frequency, and keeps total and partial kWh and kvarh counters, with up to four tariffs.¹

Power

Self-powered from the measured supply. AV2 and AV9 models are powered from the measured supply. AV5 and AV6 models need an auxiliary supply of 18 to 60 V AC/DC (L) or 115/230 V AC (D).¹

Active energy accuracy

Class 1 (EN 62053-21); Class B (EN 50470-3)¹

Reactive energy accuracy

Class 2 (EN 62053-23)¹

Voltage and current accuracy

±0.5 % of reading¹

Direct connection (AV2, AV9)

10(65) A per phase¹

CT connection (AV5, AV6)

1/5(10) A secondary¹

Voltage (AV5)

160 to 480 V L-N, 277 to 830 V L-L¹

Systems (standard versions)

3-phase 4-wire and 3-wire, 2-phase 3-wire, 1-phase 2-wire¹

RS-485 port (IS option)

Modbus RTU, 4800 or 9600 bit/s, up to 160 devices and 1,000 m per bus¹

Legal metrology

MID certified with the PF option; only the total imported energy counter is certified¹

Dimensions

71 × 90 × 64.5 mm, 4 DIN modules¹

Protection

IP50 front, IP20 terminals¹

Operating temperature

-25 to 55 °C, 0 to 90 % RH non-condensing¹

Where it is used

• Tenant and departmental submetering, where the MID-certified PF version gives a billing-grade kWh register.

  Tenant submetering and cost allocation

• Distribution board and feeder monitoring through current transformers, with the AV5 range.

  Transformer and distribution board monitoring

• Bringing existing meters on a Modbus bus into a BMS or SCADA system through Edge.

  Modbus meter integration for a BMS or SCADA system

Interface

Setup

1. Check the order code

   Only models with the IS option have the RS-485 Modbus port. M1 models speak M-Bus and DP models speak Dupline; the EM24 Ethernet model uses a different register definition.¹

2. Wire the bus

   Run a two-wire RS-485 bus from the meter to a ZMB-31 or the Gateway’s serial interface, up to 1,000 m, and terminate it with 120 Ω between A and B at both ends.¹

3. Set address and speed

   Use the front joystick to give the meter a unique Modbus address from 1 to 247 and a baud rate of 4800 or 9600 bit/s, then set Edge to match.¹

4. Read one register

   Import the Edge template, then read Voltage L1-N (input register 0) and compare it with the meter’s display. A value of 7FFFh in the high word means the meter is signalling overflow.²

5. Enable the map

   Once voltage, current and total power match the display, enable the remaining registers and watch several fresh readings before you add exports or alarms.

Common questions

Which EM24-DIN models have Modbus?

Models with the IS option in the order code have an RS-485 port that speaks Modbus RTU, plus three digital inputs. The M1 option is M-Bus and the DP option is Dupline, and neither speaks Modbus.¹

Are the EM24 register addresses zero-based?

Yes. The addresses on this page are the protocol document’s hexadecimal addresses used as zero-based PDU addresses, so Voltage L1-N is input register 0. A master that uses 30001-style numbering shows it as 30001.²

How are 32-bit values ordered?

Carlo Gavazzi sends the least significant word first, with the most significant byte first inside each word. In Edge that is big-endian bytes with word swap on every INT32 register.²

Can the EM24-DIN be used for billing?

The PF version is certified under the Measuring Instruments Directive for fiscal metering. Only its total imported energy counter is certified; exported energy and the other values are not.¹

What baud rates does the RS-485 port support?

4800 and 9600 bit/s, set from the front joystick. Up to 160 devices can share one bus of up to 1,000 m.¹