Contrel Emm-r3 va User manual

EMM-R3 VA instruction manual IM425-U v2.0 pag. 1

INSTRUCTION MANUAL

IM425-U v2.0

EMM-R3 VA MULTIFUNCTION VOLT/AMMETER

GENERAL

The digital Multifunction Volt/Ammeter series EMM-VA allow

monitoring the main electrical parameters present on a

distribution line. The local display of the electrical parameters

is being made through 3 display with red LED, which grant a

good and simultaneous reading of various measures. The

intuitive selection of the measures to visualise, which are

signalled by their corresponding LED, completes a clear and

simple front panel, which offer a lot of useful information.

On top of the instantaneous measuring, these instruments

visualise the maximum peak of the main parameters

(maximum peak and maximum demand or maximum average

value).

Multifunction Volt/Ammeter series EMM-VA replace, in an

unique device, all the functions of voltmeters, ammeters and

frequency meters, permitting a great economic saving, due to

reducing of dimension and wiring, so as optimising the

instruments management, since one has most of all in one,

for electrical boards, switch-boards and Gen-Sets.

AVAILABLE MODELS

Several models, with various optional functions and outputs are available, either for flush mounting on front panel and for

DIN rail mounting.

INTRODUCTION

The EMM-3VA is only featured for visualising the electrical parameters. The power supply is taken from the measured

voltage or self-supplied.

ACCESSORIES and OPTIONS

Accessories: transparent cover for frontal protection type COP-96.

Options: power supply and measure voltages different than standard

measuring current inputs with internal CT’s

MESURED PARAMETERS

Parameters Measuring units Identification Symbols

Phase and three phase voltage [V-kV] V L1-N V L2-N V L3-N ΣV L-N

Phase to phase and three phase system voltages [V-kV] V L1-L2 V L2-L3 V L3-L1 ΣV L-L

Phase and three phase currents [A-kA] I L1 I L2 I L3 ΣI

Frequency [Hz] Hz L1

Instantaneous Values:

Maximum phase voltage [V-kV] V L1-N max V L2-N max V L3-N max

Minimum phase voltage [V-kV] V L1-N min V L2-N min V L3-N min

Maximum phase to phase voltage [V-kV] V L1-L2 max V L2-L3 max V L3-L1 max

Maximum phase current [A-kA] I L1 max I L2 max I L3 max

Measured value in 15’

Average phase current (maximum demand) [A-kA] I L1 max (avg) I L2 max (avg) I L3 max (avg)

EMM-R3 VA instruction manual IM425-U v2.0 pag. 2

INSTALLATION

WARNING FOR THE USER

Read carefully the instructions/indications contained in this manual before installing and using the instrument.

The instrument described in this manual is intended for use by properly trained staff only.

SAFETY

This instrument has been manufactured and tested in compliance with EN 61010-1 standards. In order to maintain these conditions and

to ensure safe operation, the person must comply with the indications and markings contained in the manual. When the instrument is

received, before beginning installation, check that it's OK And it has not suffered any damage during transport. When starting

installations make sure that the operating voltage and mains voltages are compatible with the device instructions. The instrument power

supply must not be earthen. Only qualified and authorised personnel must carry out maintenance and/or repair. If there is ever the

suspicious that, that there is a lack of safety, during operation, the instrument must be disconnected and cautions taken against

accidental use.

Operation is no longer safe when: The instrument doesn't work. - There is clearly visible damage. - After serious damage

incurred during transport. - After a storage under unfavourable conditions.

WIRING

For a correct use of the device, the wiring diagram contained in the present manual must be respected.

The connections are available on the screw terminal:

- Auxiliary power supply:

The power supply is take from voltage inputs.

There are 3 different auxiliary supplies:

Vn 110V = 100-125V 50-60Hz

Vn 230V = 220-240V 50-60Hz

Vn 400V = 380-415V 50-60Hz

In the standard version the voltage is 400V and it’s taken between the phases L2-L3.

In the following table it’s possible to see the measurable voltage depending of the type of power supply.

Power supply terminals Rated voltage Range of measurable voltage

400V 300÷500V phase to phase (175÷290V phase-neutral)

230V 175÷290V phase to phase (130÷170V phase-neutral)

L2-L3 (phase to phase power supply)

110V 85÷145V phase to phase (50÷85V phase-neutral)

230V 300÷500V phase to phase (175÷290V phase-neutral)

L3-N (phase – neutral power supply) 110V 175÷290V phase to phase (100÷170V phase-neutral)

The standard version allows applying the instrument at all the three-phase network 400V with or without neutral supplied.

For example for application on single phase 230V it will need the L3-N / 230V. While for applications in medium voltage

(for example using external voltage transformer 15 / 0.1 kV phase to phase) it will need the version L2-L3 / 110V.

- measuring voltage inputs:

4 terminals are available for the connection to the 3 phase and

neutral of the measuring network, the maximum voltage phase to

phase shouldn't be over 500 V rms and it will always be depending

on the auxiliary power supply.

In case of a 3 phase system without neutral, or non-distributed

neutral, to leave terminal N free.

It’s possible to use external voltage transformer. In fact the

transformation rate of the external transducer can be set in the

SETUP of the instrument and the visualisation allows the reading of

voltage up to 40,0 kV.

- measuring current inputs:

4 terminals are available for the connection to 3 external CT’s with

secondary 5A, it’s possible to use 2 CT’s on 3 wires system (three

phases Aaron wiring). The use of external CT’s is always necessary.

The transformation rate of the external transducer can be set in the

SETUP of the instrument and the visualisation allows the reading of

voltage up to 9,99 kA.

NOTE: It's a must to respect the phase sequence. The connections between current and voltage phase inputs must not be inverted (for

example, CT placed on phase L1 must correspond to the I1 input). So as it is not correct to invert S1 and S2 terminals.

To fix the device at the panel, insert the two brackets into their corresponding grove holes, at the side of the enclosure and fix up the

screws. It’s better to put an external protection with fuses for the voltage inputs and to use adapted cables for the working currents and

voltages: section from 0.5 to 2.5 mm2.

ENER GY C OUN TE RS

PANNELLO POSTERIORE (lato connessioni)

morsettiera a vite

EMM-R3 VA instruction manual IM425-U v2.0 pag. 3

WIRING DIAGRAM

C.I.

measure current inputs

measure voltage inputs

on lines with 3 wires (without neutral or with neutral

not supplied) the N terminal must not be connected

THREE PHASE LINE

WITH 3 OR 4 WIRES

THREE PHASE LINE

WITH 3 WIRES AND 2 CT’s

( AARON wiring)

*the voltage wiring with 2 VT is

possible only for the version with

internal CT’s

P1 P2

THREE PHASE LINE

WITH 4 WIRES AND 3 VT

P1 P2

S1 S2

SINGLE PHASE LINE

If the instruments are used on single phase line, the

measures are referred to the L3 phase.

Don’t consider the other data displayed regarding to

the three phase value system.

LOAD

C.I.

measure current inputs

measure voltage inputs

EMM-R3VA

C.I.

measure current inputs

measure voltage inputs

C.I.

measure current inputs

measure voltage inputs

EMM-R3VA

LOAD

EMM-R3VA

LOAD

EMM-R3VA

LOAD

EMM-R3 VA instruction manual IM425-U v2.0 pag. 4

FRONT PANEL DESCRIPTION

DESCRIPTION:

A: Push-button for visualising of the three phase system parameters with the corresponding indication LED.

By pressing during 5 seconds, user accedes to programming the instrument (SETUP).

B: Push-button for selecting the measures to visualise on display E.

C: LED’s for indicating the measures visualised on display Eand the eventual multiplier factor of each parameter

(reading k =kilo x1000).

D: LED for indicating the visualisation of the memorised peak values.

E: Three displays for visualising the measures, subdivided by phases. Should the LED ΣLbe glowing,it indicates

the three-phase system value of the selected parameter.

A+B: By pressing the two keys simultaneously at the visualisation mode, it accedes to the visualisation of the

memorised peak values.

EMM-R3 VA instruction manual IM425-U v2.0 pag. 5

MENU OF INSTRUMENT PROGRAMMING (SETUP)

For a correct use of the instruments it’s necessary to program the transformation rate of the CT’s and the transformation

rate of the eventually voltage transformers. The values set are hold also in absence of the auxiliary power supply.

- Programming of the transformation rate of the external CT’s

The programming of the CT’s rate considered as the rate between

primary and secondary (example: with CT 1000/5, we must set 200),

must be done with the push-button on the front panel.

After the connecting the power supply to the instrument and waiting few

seconds (all LED’s will glow and the first indication of the firmware

appears on the display and all segments will glow later), press and keep

pressing the key Aduring 5 seconds, when the message set up will

appear on the display E. By pressing the key Aagain it will appear the

message CT (current transformer) and the value of the transformation

rate (set to 1 by the manufacturer).

To increase the value press the Bbutton or Abutton reduce the value

(the variation is unit for unit).

To increase the speed up the value setting, it’s necessary to hold pressed

the Bor Abutton, the variation will happen successively by tens and

hundreds.

To come back to increase or to reduce the value on unit by unit way, it’s

necessary to release and to press the key again.

To confirm the value set press the Abutton; in this way the instrument will pass to the successive programming.

If no key is pressed during a 10-second interval of time, the instrument will exit automatically from programming, without

saving the selected value.

- Programming of the transformation rate of the external voltage transformers

After the precedent programming, the message VT (voltage transformer) will appear on display Etogether with the value

of the transformation rate of the external VT (set to 1 by the manufacturer), considered as the rate between primary and

secondary (example with VT 15/o.1 kV the value will be 150).

In the same way as programming the CT’s rate, it will be possible to set this value. If external VT are not used the value

to set will be 1.

To confirm the value press the Abutton. The instrument will exit from programming and it will enter in the visualisation

modality.

-Activating or cancelling the automatic scrolling

This allows selecting ON for activating or OFF for cancelling the automatic scrolling of the measures visualisation.

MEASURES VISUALISATION

The measures reading is visualised on the display E, showing the three phase measures (L1, L2 y L3 respectively) of the

indicated parameter by the CLED. For measuring the phase to phase voltage (V L-L), the three measures are understood

V L1-L2, V L2-L3, V L3-L1 respectively, as indicated on the front plate.

The selection of the parameter to be visualised is made by pressing the key B. It will be indicated by the C LED.

By pressing the key A, the selected parameters will be visualised on display E, as three phase values (average of the

individual phases for voltages and currents) with the corresponding lighting of the LED, placed internally in the key. In

This case, by pressing the key Bit will be possible to show: either the three-phase voltage, calculated as the average of

the phase voltage, or the phase to phase voltages (it will be indicated by the corresponding LED C). In the mode of

visualisation of the three-phase system (LED ΣL glowing), we will have following lights and readings:

- LED VL-N or (VL-L) and the display L1 will show the average phase voltage (or average phase to phase)

- LED Aand the display L2 will show the average current

- LED Hz and the display L3 will show the frequency on line L1

By pressing the Akey again, it will return to visualise the phase values.

Please note that the unit value may be expressed in kilo, when the corresponding LED C are glowing (indicated in the

front plate as k).

The visualised frequency is referred to the line L1.

L-N

L-L

electrical multi meter

L1-2

L2-3

L3-1

MAX

max

avg

EMM-R3 VA instruction manual IM425-U v2.0 pag. 6

VISUALISING THE INSTANTANEOUS AND AVERAGE PEAK (MAXIMUM) VALUES

By pressing the Aand Bkeys simultaneously, the instrument enters

into the visualisation of the peak (maximum) values: The LED Dwill

glow. The memorised peak (maximum) values, which might be

selected by the Bkey, will be shown on the display E.

The indication of the value and the value itself will be visualised

alternatively on the display E.

If no key is pressed during an interval of time of 10 seconds, the

instrument will return automatically to the visualisation of measures.

There are two types of the maximum memorised values:

The instantaneous maximum memorised value is the maximum

reached value of the parameter, during 1-second al least.

The average maximum values (maximum demand) memorise the

maximum average value of the parameter, reached during the last

15 minutes.

The integration for calculating the average values is synchronised

every time that the instrument is switched on.

During the visualisation of the maximum memorised values, the

values are visualised by alternating the indication of the visualised

parameter with the measured values.

The maximum values of the parameters, which are selectable with the Bkey, are as follows:

Parameter Display Signalling LED

VL-N maximum instantaneous IST HI VL-N

VL-N minimum instantaneous IST LO VL-N

VL-L maximum instantaneous IST HI VL-L

I phase maximum instantaneous IST LO A

I phase average maximum 15’ HI A

Cancellation of the peak values

Enter in programming mode (SETUP), press the key Buntil the message reset appears on the display E, then press

the key Aand the message RES ALL no will appear on display E. By pressing the key Bthe message will change to

RES ALL yes. If confirmation is made with the key A, all memorised data will be cancelled. The exit of the

cancellation menu is made automatically.

NOTE regarding the measures

The refresh time of display is lower than 1 second and it corresponds to the processing time of measure according to the used

measuring methodology, allowing a comfortable reading of values, also in presence of unexpected deviation of the measured

parameters.

Should the case be that the instrument is being used in a single-phase line, please bear on mind that the valid values are referred to

phase L3. Other visualised values shouldn’t be considered, since they correspond to three-phase system.

In case that the indicated measures aren’t reliable or they are absurd, it’s important to check carefully the current and voltage inputs

connection, so as the phase sequence. Check that current and voltage correspond to the same phase (on input L1 it will be connected

phase voltage L1 and the CT will be placed on phase L1), thence terminal S1 of CT will be wired to the relative terminal S1 on the

instrument.

If the secondary of the CT is connected to other instruments also, it can be experienced some measuring problems, according with the

typology of current inputs. Should that be the case, the user should select the option of the instruments type (T) with internal CT’s.

L-N

L-L

elec trical multi meter

L1-2

L2-3

L3-1

MAX

max

avg

EMM-R3 VA instruction manual IM425-U v2.0 pag. 7

TECHNICAL CHARACTERISTICS

MEASURES, ACCURACY

Voltage True rms for the phase, phase to phase and three-phase voltage

Total measuring range: 20÷500V trms phase-phase - 290V rms phase-neutral, depending always to the

power supply voltage.

Visualization (0,02÷50,0kV) – measuring accuracy: ±0,5% ±1 digit

Current True rms for the phase and three-phase currents.

Measuring range: 0,02÷5A trms - accuracy: ±0,5% ±1 digit

Visualization 0,02÷9990A

Frequency Frequency of the phase L1 – measuring range: 30÷500Hz

accuracy: ±0,5% ±1 digit

AUXILIARY POWER SUPPLY -INPUTS

Aux. power supply Standard 380-415V ±15% - options 100-125 / 220-240V ±15%

Frequency 50-60Hz - absorption 3VA

Voltage taken from the measuring voltage inputs

Voltage inputs from 20 to 500V phase-phase (always depending on the auxiliary supply); permanent overload +20% -

impedance at the input: 1 MΩ

Three-phase wiring with 3 or 4 wires, and single-phase wiring

MV connection through external VT with programmable transformation ratio from 1 to 400

Current inputs From 0,02 to 5A; permanent overload 30% - from external CT’s with secondary 5A

primary programmable from 5 to 10000A – self consumption <0,5VA

GENERAL

Display and keyboard 3 display with red LED of 10 mm each, made of 3 digits of 7 segments

2 keys for selection of measures and programming

Mechanical Protection degree: IP52 frontal - IP20 enclosure and terminals - weight: approx. 0,5 kg.

Wiring through terminals for screws, cross section cable of 2,5 mm2

Self-extinguishing plastic enclosure –Flush mounting DIN 96x96mm, depth 56mm

Environment Working temperature: -10÷60°C; relative humidity <90%

Storage temperature: -25÷70°C

Isolation test: 3 kV during 1 minute

Standards of reference

and Marking

CEI EN 50081-2; CEI EN 61000-6-2;

CEI EN 61010-1

DIMENSIONES

mult i met er

L- N

cos

VAr

L-L

L-N

°CHz

L-L

PEAk

foratura pannello

L-L

L-N

°C

electrical

multi met er

P.F.

VAr

L-N

L-L

pea

L-N

L-L

electrica l multi m eter

L1-2

L2-3

L3-1

MAX

max

avg

For other applications, please contact with CONTREL technical assistance department.

NOTE

Due to the continuous evolution of standards and products, the company reserves itself the rights of modifying the characteristics of the present product,

at any time.

The manufacturer’s liability due to damages caused by defects of the product...” might be reduced or superseded (...) when the damage has been

caused jointly, by a product’s defect or/and by cause of the injured party or a person under the injured party’s responsibility” (Article 8, 85/374/CEE).