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Introduction

This document provides instructions for installation,

operation, and maintenance.

Device description

The energy meter (device) measures and displays

important electrical parameters in three-phase four-wire

(3p4w), three-phase three-wire (3p3w), single-phase

two-wire (1p2w), and single-phase three-wire (1p3w) grid

systems. The energy measurement is bidirectional, i.e.

imported and exported energy are measured separately, so

that, for example, the solar gain of a PV system can also

be recorded.

The maximum demand of current and power can be

measured over preset periods of up to 60minutes.

The device has measurement inputs for voltages and

currents. External current transformers (CT) are required

for current measurement. A wide range of CTs is available,

giving the device a wide range of applications. Use

calibrated transformers if the MID-certified device is used

for billing purposes!

The device can be supplied by a separate auxiliary voltage

(AC or DC). Alternatively, it can also be supplied from the

monitored grid system, where appropriate.

Intended use

The MID-certified device is intended for the following uses:

• Measurement of power and cumulative energy in the

specified grid systems.

• Installation in wheather-protected switchboard cabinets

and small distribution boards in industrial and residential

environments. The installation position is arbitrary.

• For indoor use only.

• Use in accordance with national specifications.

Improper use:

The following is considered improper use:

• Operation outside the specifications, e.g., regarding

operating/measuring voltage or current, environmental

specifications, etc.

• Too high or wrong external back-up fuse (fig.5).

• Installation in vehicles! Use of the device in non-

stationary equipment constitutes an exceptional

environmental condition and is only permissible by

special agreement.

• Installation in environments with harmful oils, acids,

gases, vapors, dusts, radiation, etc.

Safety precautions

• During normal operation, life-threatening voltages may

be present at some terminals of this device. Installation,

operation, and maintenance must only be carried out by

qualified and trained personnel in compliance with local

regulations.

Ensure that all power supplies are de-energized before

connecting the device or performing any other work.

• After installation, the terminals must not be accessible

to the user. The external installation precautions must be

sufficient to prevent hazards under fault conditions.

• This device is not intended to function as part of a

system that serves as the sole means of protection

against faults – good engineering practice requires

that each critical function is protected by at least two

independent and different means.

• The device does not have an internal fuse. An external

1A/300VAC fast-blow fuse at terminal5 (Fig.5) is

required. If the circuit is faulty or abnormal, the fuse will

blow quickly for line protection and safety.

• Never operate current transformers (CTs) open on the

secondary side, as dangerously high voltages can occur.

Short-circuit the secondary connections of the CTs if you

disconnect the secondary circuits.

• The CTs connected to this device must meet double

insulation requirements. The secondary connection

can be grounded depending on the CT (refer to the CT

documentation).

• Install and operate the device according to the Technical

Data specified in this manual.

Start-up displays

ImpExp

MaxMin

m

3

C

The first display lights up

all display segments and

can be used as a display

check.

The second display

indicates the firmware

installed in the device and

its build number.

The next display indicates

an additional internal

version number.

The device performs a self-

test and indicates the result

if the test passes.

*After a short delay, the display shows the measurement

display for active energy.

Button functions

The buttons operate as follows:

ESC

V/A

Selects the Voltage and Current

displays.

In the setup menu, this is the “Left” or

“Back” button.

MD

PF Hz

Selects the Frequency and Power

factor displays.

In the setup menu, this is the “Up”

button.

P

Selects the Power displays.

In the setup menu, this is the “Down”

button.

E

Selects the Energy displays.

In the setup menu, this is the “Enter” or

“Right” button.

Measured value displays

Voltage and current

Each time you press the

ESC

V/A

button, the next display is

shown:

Phase to neutral voltages

Phase to phase voltages

Current on each phase

Neutral current

Phase to neutral voltage

THD% (total harmonic

distortion)

Current THD% for each

phase

Frequency, power factor, max. demand

Each time you press the

MD

PF Hz

button, the next display is

shown:

Frequency and power

factor (total)

Power factor of each phase

Maximum current demand

of each phase

Maximum power demand

Power

Each time you press the

P

button, the next display is

shown:

Instantaneous active power

in kW

Instantaneous reactive

power in kVAr

Instantaneous apparent

power in kVA

Total kW, kVArh, kVA

Energy

Each time you press the

E

button, the next display is

shown:

Total active energy in kWh

Total reactive energy in

kVArh

Imp

Imp: Imported active

energy in kWh

Exp

Exp: Exported active

energy in kWh

Imp

Imp: Imported reactive

energy in kVArh

Exp

Exp: Exported reactive

energy in kVArh

Digital input 1 counter

value

Digital input 2 counter

value

Digital input 1 state (on/off)

Digital input 2 state (on/off)

Energy values can only be reset via modbus.

Underrange and overrange

Indication on the display

On the voltage, current and power displays, etc., when the

measured values are below the measurement range, the

display shows “0”.

When the measured values are above the measurement

range, two displays alternate. One shows the actual

measured value and the other shows “-“ symbols.

Example: If the voltage is exceeded, the display alternates

at short intervals between the following two displays:

Display 1

(measured value)

Display 2

(overrange indication)

Defined thresholds

UnderrangeOverrange

Voltage< 30V

(for L-N / L-L)

> 317V (for L-N)

> 550V (for L-L)

Current< 0.004A

(for L-N / L-L)

> 6A

(for L-N / L-L)

Power< 1W (VAr)(VA)

(for L-N / L-L)

> 1830W(VAr)(VA)

(for L-N)

> 3180W(VAr)(VA)

(for L-L

Note: The threshold values of underrange and overrange

are the secondary values of the meter. CT and PT ratios are

not included.

For example: If the CT ratio is 10, it is underrange when

the current is less than 0.04A (=0.004*10). It is overrange

when the current is over 60A (=6*10).

Setting-up the device

The setup menu is password-protected. To enter the

setup menu, press the

E

button for 3seconds until the

password display appears:

Enter the password (default ‘1000’).

Use the

MD

PF Hz

and

P

buttons to set

the flashing digit.

When the password is entered, press

the

E

button for 3seconds.

If an incorrect password is entered,

the display shows: PASS Err

To exit the setup menu, press the

ESC

V/A

button repeatedly

until the measurement display is shown.

Input methods for setting up

Some menu items, such as password and CT, require the

entry of four-digit number (A), while others, such as grid

system, require a selection from a list of options (B).

(A) Entering numbers

When setting up the device, some displays require to enter

a number. In particular, on entry to the setting up section, a

password must be entered. Digits are set individually from

left to right. The procedure is as follows:

1) The current digit to be set flashes. Use the

MD

PF Hz

and

P

buttons to set the currently flashing digit.

2) Press the

E

button to confirm setting of each digit.

3) Press the

E

button for 3seconds to confirm an entry.

4) After setting, press

ESC

V/A

to exit the setting routine.

• If this device is manipulated or used in a manner not

specified by the manufacturer, the protection provided by

the device may be impaired.

Characteristics

The device can measure and display:

• Grid voltage and grid frequency

• Voltage THD% (total harmonic distortion) of all phases

• Current, current demand and current THD% of all phases

• Power, maximum power demand, and power factor

• Active and reactive energy (imported and exported)

The password-protected setup menu allows to:

• Select the grid system: 1p2w, 1p3w, 3p3w, 3p4w

• Configure the device, e.g., Modbus parameters, display

settings, demand interval time

• Reset the maximum demand values (power/current)

• Change the password

Features

• Certified according to the Measuring Instruments

Directive (MID) 2014/32/EU.

• Bidirectional measurement IMP & EXP

• Two digital inputs as counters

• RS485 Modbus RTU for remote monitoring and setup

• Din rail mounting 35mm (DINEN60715)

• ..1/..5A current transformer (CT) connection

• Accuracy class 0.5 active energy

Dimensions

Installation

WARNING

Risk of injury from electrical voltage!

Touching live wires or exposed conductors and

touching dangerous device inputs can cause

severe physical harm or death.

·Switch off your installation before starting

any work! Secure the equipment against

being switched on!

·Verify that it is disconnected from power!

Ground and short-circuit!

·Cover or block any nearby live parts!

Observe all safety precautions before installation!

• Mount the device on a 35mm mounting rail in a

switchboard cabinet or small distribution board.

• Connect the voltage inputs to terminals 1-4 and the

external CTs to the three current inputs (fig. 1 to 4). The

terminals have 2.5mm² connecting capacity.

Figure 1. Three-phase four-wire (3p4w)

1p2w3p4w3p3w

Figure 2. Three-phase three-wire (3p3w)

1p2w3p4w3p3w

L2L1L3N

Figure 3. Single-phase (split-phase) three-wire (1p3w).

Note:This grid system is not covered by MID directive.

Figure 4. Single-phase two-wire (1p2w)

1p2w3p4w3p3w

• Connect the auxiliary supply via an external fuse (fig.5,

terminal has 2.5mm² connecting capacity).

A

RS485

B

LN

91011121314

DI1

COM

DI2

TX-

A

TX+

B

56

Auxiliary supply

Figure 5. Supply and communication connections

Doc. no. 2.100.142.1.c 10/2025Part. no. 3303909

MID Energy Meter

EMD485-CT3-A

User manual

www.janitza.com

Janitza electronics GmbH

Vor dem Polstück 6

D-35633 Lahnau | Germany

Support +49 6441 9642-22

[email protected] | www.janitza.com

The device front may deviate!

Product specificaties