Contrel EMM-m3-VA User manual

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 1
INSTRUCTION MANUAL
IM425-U v3.1
EMM-R3-VA
EMM-µ3-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
EMM-R3-VA
EMM-µ3-VA
ACCESSORI ED OPZIONI
accessories: transparent cover for frontal protection.
options: C1 auxiliary power supply 230 V
C2 auxiliary power supply 115 V
1A current inputs for CT ../1Amp.
Tcurrent inputs with galvanic insulation (not for direct connection line insertion)
Pn.2 digital output alarm signal (Photomos ca/cc).
INTRODUCTION
The EMM-R3-VA and EMM-µ3-VA models are only featured for visualising the electrical parameters. The power supply is
taken from the measured voltage or self-supplied.
MESURED PARAMETERS
Parameters Measuring units Identification Symbols
Phase and three phase voltage [V-kV] V L1-N V L2-N V L3-N V L-N
Phase to phase and three phase system voltages [V-kV] V L1-L2 V L2-L3 V L3-L1 V L-L
Phase and three phase currents [A-kA] I L1 I L2 I L3 I
Frequency [Hz] Hz L1
Hour meter [hr] hr1 hr2 hr3
STORED PARAMETERS
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)
checks Check phase rotation

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 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 (option C2)
Vn 230V = 220-240V 50-60Hz (option C1)
Vn 400V = 380-415V 50-60Hz (standard)
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
L2-L3 (phase to phase power supply) 400V 300÷500V phase to phase (175÷290V phase-neutral)
230V 175÷290V phase to phase (130÷170V phase-neutral)
110V 85÷145V phase to phase (50÷85V phase-neutral)
L3-N (phase – neutral power supply) 230V 300÷500V phase to phase (175÷290V phase-neutral)
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 absolutely required.
The transformation rate of the external transducer can be set in the SETUP of the instrument and the visualisation allows
the reading of current 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.
REAR PANEL (connections side)
ENERGYCOUNTERS
EMM-R3-VA EMM-µ3-VA

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 3
WIRING DIAGRAM
LOAD
INSERTION ON THREE PHASE
LINE WITH 4 WIRES WITH 3 TV
EMM
P1
S1
P1
P1
P2
S1
S1 S2
INSERTION ON THREE-PHASE
LINE WITH 3 or 4 WIRES
On line with 3 wires (without neutral or
with neutral not supplied)
the N terminal must not be connected
LOAD
EMM
P1
S1
P1
P1
P2
S1
S1 S2
N
L1
L2
L3
N
L1
L2
L3

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 4
LOAD
EMM
P1
S1
P1 P2
S1 S2
N
L1
L2
L3
CURRENT INSERTION
ON THREE PHASE LINE WITH 2 CT
(insertion AARON)
V
OLTAGE INSERTION ON
THREE PHASE LINE WITH 3 WIRES
WITH 2 VT
This insertion is possible only with
the internal CT version (-t suffix).
LOAD
EMM
L1
L2
L3
S2 S2S1 S1
P2P2 P1P1

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 5
LOAD
EMM
P1 P2
S1 S2
INSERTION ON BALANCED THREE
PHASE LINE WITH 3 or 4 WIRES
On line with 3 wires (without neutral or
with neutral not supplied)
the N terminal must not be connected
L1
L2
L3
LOAD
EMM
P1 P2
S1 S2
INSERTION ON SINGLE PHASE
LINE
Only for model with phase-neutral
power supply (Vaux L3-N)
N
L

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 6
FRONT PANEL DESCRIPTION
V L-N
V L-L
A
electrical multi meter
L1
L1-2
L2
L2-3
L3
L3-1
Hz
k
k
 L
max
avg
MAX
h
B
CD
E
A
 L
L1
L1-2
L2
L2-3
L3
L3-1
electrical multi meter
MAX
max
avg
A
V
L-N
V L-L
k
Hz
k
h
 L
L1
L1-2
L2
L2-3
L3
L3-1
electrical multi meter
MAX
max
avg
A
V
L-N
V L-L
k
Hz
k
h
B
C
E
A
D
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 Lbe 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 EMM-μ3VA instruction manual IM425-U v3.1 pag. 7
MENU OF INSTRUMENT PROGRAMMING (SETUP)
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 A
during 5 seconds, when the message seT UP will appear on the display E.
The values set are hold also in absence of the auxiliary power supply.
SET GENERAL PARAMETER (SET UP)
Entry to menu: seT UP seT Up
RESET
SET DO1
SET DO2
SET HR_
DO_ OFF OFF
SET CT Increase
Set CT ratio
from1to 2000 Decrease
SET VT Increase
Set VT ratio
from0.1 to 400.0 Decrease
seT AV9 T Increase
Set average time
from1to 30 minutes Decrease
seT 3pH BALANC
Set connection UN_BAL
Type 1PH L3
seT MDE -3-
Set wiring connection
type -4-
seT SYN MDE L3
Set synchronism 50
type 60
seT SCHROLL ON
OFF
SET PAS Increase
Set Password
OFF - 0002 ÷ 9999 Decrease
Confirm and end of general settings
- 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.
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 while to reduce the value press the Abutton with
Balready pressed (the variation is unit for unit). To increase the speed up the value setting, it’s necessary to hold
pressed the Bor the couple Aand Bbuttons, 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.

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 8
- Programming of the transformation ratio of the external voltage transformers
After the precedent programming phase, on Edisplay will appear the inscription VT (voltage transformer) and the value
of the transformation rate of the external TV (set to 1 from the constructor), considered as the rate between primary and
secondary (example with TV 15/0.1 kV the value will be 150).
In the same way at the programming of the CT rate will be possible to set this value. If the external TV are not used the
value to set will be 1. To confirm the value press the Abutton.
Programming of the average time (seT AVG T’)
After the programming phase previously described, pressing another time the Akey, on the Edisplay will appear the
message AVG T’ and the average time settable from 1 to 30 minutes. To increase the value press the Bkey. To
decrease it, press the Aand Bkeys together (from the condition of Bpressed). To confirm it press the Akey.
The average time is the time used to calculate the average parameters (avg) and the maximum demand (maxD).
Programming insertion mode
It’s possible to set the following mode of insertion: UN_BAL in a unbalanced three-phase system (default), BALANC in
a balance three phase system and 1PH L3 in a single phase insertion.
In the 1PH mode are displayed only the measures of l3 phase and the relative hour counter; the status of phase rotation
is not displayed.
In the BALANC the current and the power factor of the L3 phase are used for the calculation of L1 and L2 measures.
Programming wiring connection mode
This setting allows to definite the wiring type connection. It’s possible to chose 3 wires or 4 wires. With the 4 wires
connection the neutral parameter are displayed and enabled to use for the digital outputs settings.
Programming of the synchronism type
In this setting for the synchronization type, it’s possible to choose L3 to use the external frequency (on L3 phase) or 50,
60 Hz to use the internal clock.
Activating or cancelling the automatic scrolling
This allows selecting ON for activating or OFF for cancelling the automatic scrolling of the measures visualisation.
Programming of the Password
The instrument is supplied without password. When a password (from 0002 to 9999) is set, using the B(to increase), Ae
B(to decrease) and A(to confirm) keys, only who know this value can to enter in the setup. The password, in fact, is
required all the time that someone try to enter in the setup (pressing the Akey at least 5 seconds). If the password is
wrong, the message PASS ERR will appear on Fdisplay and the instrument go back to the measures visualization. To
input the password, when required by the instrument, at the enter of the setup, use the A, Band Ckeys as the same way
done previously.
PEAK VALUES AND ENERGY COUNTERS RESET (RESET)
Enter in setup mode, press the Bkey up to show the message ReseT on the Edisplay, press the Akey, on the display
will appear RES ALL NO, press the Bkey another time, the message commute in RES ALL yes, confirming with
the Akey all stored data will be deleted. Automatically the instrument come back to the measure visualization.
Entry to menu:
seT UP seT Up
RESET
SET DO1
SET DO2
SET HR_
--- OFF OFF (the visualization depends on the settings and the I/O status)
To enable the chosen type, press the Bkey to change the indication on display Gfrom NO to yes. Confirm enabling
cancellation, by pressing the Akey. The indication on Edisplay change from yes to --- .

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 9
PROGRAMMING OF THE DIGITAL OUTPUT (SET DO1 SET DO2)
This setting is enabled only in the model with digital outputs (-p suffix in the order).
The DO1 and DO2 digital outputs can be used to signal alarms (ALR) using a comparing with two adjustable threshold
for each output. The DO1 modality setting is independent from DO2. In the menu SET DO1 and SET DO2 it’s possible
to program the function of all digital outputs. In these menus are available the following modality: ALR SYS 3PH and
ALR SYS 123. With ALR SYS 3PH the digital output will function as alarm verifying that the three phase value
(average) doesn’t exceed the threshold set (ALR HI and ALR LO). With ALR PH_ 123 the digital output will
function as alarm verifying that the maximum value of the single phases doesn’t exceed the maximum threshold set
(ALR HI) and that the minimum value of the single phases doesn’t come down the minimum threshold set (ALR LO).
The activation of the alarm output will come after some seconds of delay set (ALR DL).
Enter to menu:
seT UP seT Up
RESET
SET DO1
SET DO2
SET HR_
--- OFF OFF (the visualization depends on the settings and the I/O status)
ALR SYS 3PH To choose the output modality
ALR PH_ 123
ALR SEl uLN To chose the parameter
ALR SEl AMP to control
ALR SEl VLL (see variable list)
ALR SEL FRE (only for ALR SYS 3PH)
AlR sel PH_
Set maximum alarm threshold Increase
ALR HI Decrease (after 0there is OFF)
Set minimum alarm threshold Increase
ALR LO Decrease (after 0there is OFF)
Set delay Increase
ALR Dl Decrease
Confirm and end of digital output settings.
ENTER IN THE SETUP
Fromthemeasuresvisualization,presstheAkeyforatleast5seconds,themessageSeT UpwillappearontheEdisplays.
CHOOSE THE DIGITAL OUTPUT TO PROGRAM
Press repeatedly the Bkey until the message SET DO1 (DO1 output) or SET DO2 (DO2 output) appears on the E
display. Press the Akey to select this setting.
SELECT THE MODALITY OF FUNCTIONING OF THE DIGITAL OUTPUT
To select the functioning mode, using the Bkey: ALR SYS 3PH, (alarm on three phase value) and ALR PH_ 123
(alarm on minimum and maximum single phase value). Press Akey to confirm.
CHOOSE THE PARAMETER TO LINK TO THE DIGITAL OUTPUT
With an alarm modality set, it’s necessary to select the parameters associated to the alarm output; by pressing the Bkey
until the parameter choice appears on the third part (L3) of Edisplay and the glowing the corresponding led on the Dbar.
Press Akey to confirm the set.
SET THE HIGH AND THE LOW THRESHOLDS
On Edisplay will appear the message ALR Hi with the high threshold value; confirming with the Akey on the same
display will appear the message ALR LO with low threshold value. The Bkey (to increase), Aand Bkeys together (to
decrease) are used to set the high and the low thresholds values. The range depends by the parameter and it is linked to
the CT and VT ratios. Pressing Akey to confirm.
The threshold set is linked with CT and VT ratios, for this reason it’s necessary to make this operation after the
programming of the CT and VT. The end scale value must be confirmed when CT and VT ratios are modified.
The low threshold will be lower than high threshold. If the high threshold is set as OFF the low threshold will have the
range of the high threshold.

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 10
t < delay
Digital
output
Threshold HI
delay
HysteresisHI
Alarm
SET THE DELAY TO THE DIGITAL OUTPUT ACTIVATION
Now it’s possible to set the delay that will pass between the alarm condition set and the activation of digital output. On E
display will appear ALR DLY and the value expressed in seconds (range 1÷900). The modification of the value is done
in the same way of the threshold set. With the confirmation (Akey) the set is complete.
The programming will be referred to the digital output indicated on Edisplay (DO1 o DO2).
With only the HI threshold set, the alarm condition is activated when the parameter set in alarm exceed the threshold.
The digital output is enabled only if the alarm condition remain activated for all delay time set. From the activation of the
digital output, the restore is automatic when the parameter decreases below the hysteresis value.
With only the LO threshold set, the alarm condition is activated when the parameter set in alarm drop below the
threshold. The digital output is enabled only if the alarm condition remain activated for all delay time set. From the
activation of the digital output, the restore is automatic when the parameter grow above the hysteresis value.
With both LO and HI threshold set, the alarm condition is activated when the parameter set in alarm is outside from the
values band limited by LO and HI thresholds. The digital output is enabled only if the alarm condition remain activated for
all delay time set. From the activation of the digital output, the restore is automatic when the parameter return inside the
values band limited by LO and HI thresholds.
t <delay
Digital
output
ThresholdLO
delay
HysteresisLO
Threshold HI
Alarm delay
HysteresisHI
t < delay
Digital
output
ThresholdLO
delay
HysteresisLO
Alarm
Functioning for
exceeding the
maximum threshold
Functioning for
dropping above
minimum threshold
Functioning for
exceeding or dropping
by the band defined by
maximum and
minimum threshold

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 11
PROGRAMMING OF THE HOURS COUNTER (SET HR_)
The hour counter will be increased when the measure of the parameter will exceed the set threshold value. The threshold
set is applied to the system value of the parameter selected. For the frequency the referring it’s the same to the measure
of the L3 phase.
seT UP seT Up
RESET
SET DO1
SET DO2
SET HR_
--- OFF OFF (the visualization depends on the settings and the I/O status)
HR_ SEl VLN
HR_ SEl AMP To chose the parameter
HR_ SEl VLL (see the variable list)
HR_ SEL FRE
Set the threshold Increase
HR_ HI Decrease
Confirm and end of hour counter settings.
SELECT THE PARAMETER TO LINK TO THE HOURS COUNTER
From the previous setting, pressing the Bkey it’s possible to set the hours counter: the message SET HR_ appears on
the Edisplay. Press the Akey to define the parameter to link to the hours counter. Press more time the Bkey to select
the parameter and the Akey to confirm it.
SET THE THRESHOLD
Subsequently it’s necessary to set the threshold using the Bkey (to increase) and Aand Bkeys (to decrease). Confirm
with Akey.
I/O INFO PAGE
After the hour counter set, the I/O info page appears in Edisplays: on the second part (L2) the status of the first digital
output (DO1), on the third part (L3) the status of the second digital output (DO2).
VARIABLE LIST
VLN three-phase voltage
AMP three-phase current
VLL phase to phase voltage
FRE frequency
PH_ check the rotation phase voltage connection

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 12
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 CLED.
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.
WithLEDLturnedoffandunbalancedthreephasesystemmode(UNBALANC)aredisplayedinthefollowingsequence:
- LED VL-N ON: On the display are showed the phase voltages
- LED VL-L ON: On the display are showed the phase to phase voltages
- LED A ON: On the display are showed the phase current
- LED Hz ON: on L3 display is showed the frequency measured on L3 phase, on L1 display will appear the
message PHASE ROTATION with a bright dash that rotate clockwise to indicate that the
phase rotation is correct, or the message ERR if the phase rotation is wrong.
- LED h ON: On the display are showed the phase hour counters HR1, HR2, HR3. The reading of the
meters uses the 6 digits (maximum reading 99999.9) of the Edisplay the measure comes
visualised in such a way that, the display L1 will show the first 3 digits, the display L2 the second
3 digits and the display L3 the identification of the corresponding hour meter (HR1, HR2, HR3).
Each hour counter is activated when the measure of phase corresponding to the selected
parameter exceed the threshold set (see SET HR_). The measure is expressed in hour
(integer) and tenths of hours (decimal).
By pressing the Akey the LED L is enabled and the system values are displayed.
Please note that the unit value may be expressed in kilo, when the corresponding LED Care glowing (indicated in the
front plate as k).
The visualised frequency is referred to the line L3.
EMM-R3-VA
V L-N
V L-L
A
L1
L2
L3
Hz
k
k
L
h
EMM-R3-VA
V L-N
V L-L
A
L1
L2
L3
Hz
k
k
L
h
[1] Visualization
PHASE VOLTAGES
EMM-R3-VA
V L-N
V L-L
A
L1
L2
L3
Hz
k
k
L
h
[2] Visualization
PHASE TO PHASE VOLTAGES
EMM-R3-VA
V L-N
V L-L
A
L1
L2
L3
Hz
k
k
L
h
[3] Visualization
PHASE CURRENTS
EMM-R3-VA
V L-N
V L-L
A
L1
L2
L3
Hz
k
k
L
h
[6] Visualization
HOUR COUNTER 3
215h and 30’
EMM-R3-VA
V L-N
V L-L
A
L1
L2
L3
Hz
k
k
L
h
[4] Visualization
PHASE ROTATION CORRECT [4] Visualization
PHASE ROTATION WRONG

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 13
Visualizations parameter of system (LED L on),
In balanced three phase system mode (BALANC) are available only the visualization [7] and [8]:
In single phase mode (!PH L3) the pages displayed are the following:
EMM-R3-VA
V L-N
V L-L
A
L1
L2
L3
Hz
k
k
L
h
[9] Visualization measure of L3 phase.
L1: AVERAGE PHASE VOLTAGE
L2: AVERAGE PHASE CURRENT
L3: FREQUENCY
EMM-R3-VA
V L-N
V L-L
A
L1
L2
L3
Hz
k
k
L
h
[10] Visualization
HOUR COUNTER 3
215h and 30’
EMM-R3-VA
V L-N
V L-L
A
L1
L2
L3
Hz
k
k
L
h
[7] Visualization measure of system
L1: AVERAGE PHASE VOLTAGE
L2: AVERAGE PHASE CURRENT
L3: FREQUENCY
EMM-R3-VA
V L-N
V L-L
A
L1
L2
L3
Hz
k
k
L
h
[8] Visualization measure OF system
L1: AVERAGE PHASE TO PHASE VOLTAGE
L2: AVERAGE PHASE CURRENT
L3: FREQUENCY

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 14
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 average time.
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 PEA HI VL-N
VL-N minimum instantaneous Pea LO VL-N
VL-L maximum instantaneous PEA HI VL-L
I phase maximum instantaneous PEA LO A
I phase average maximum AVG HI A
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.
V L-N
V L-L
A
electrical multi meter
L1
L1-2
L2
L2-3
L3
L3-1
Hz
k
k

L
max
avg
MAX
h
142
148
142
B
C
C
E
A
D

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 15
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: 45÷65Hz
accuracy: ±0,5% ±1 digit
AUXILIARY POWER SUPPLY -INPUTS
Aux. power supply Standard 380-415V ±15% - options 100-125 / 220-240V ±15%
Frequency 45-65Hz - 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 M
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 –
EMM-R3-VA: Flush mounting DIN 96x96mm, depth 56mm
EMM-µ3-VA: Flush mounting DIN 72x72mm, depth 95mm
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

EMM-R3-VA EMM-μ3VA instruction manual IM425-U v3.1 pag. 16
DIMENSIONS
68
68
R3
72
72
Drill panel
 L
L1
L1-2
L2
L2-3
L3
L3-1
electrical multi meter
MAX
max
avg
A
V L-N
V L-L
k
Hz
k
h
 L
L1
L1-2
L2
L2-3
L3
L3-1
electrical multi meter
MAX
max
avg
A
V L-N
V L-L
k
Hz
k
h
81 149
65,8
888
888
888
V L-N
V L-L
A
electrical multi meter
L1
L1-2
L2
L2-3
L3
L3-1
Hz
k
k
 L
max
avg
MAX
h
92
92
R3
96
96
90
96
56
9
20
Drill panel
EMM-R3-VA
EMM-µ3-VA
For other applications, please contact with CONTREL technical assistance department.