Energy Management
Energy Meter
Type EM21 72D
• Multi-use housing: for both DIN-rail and panel
mounting applications
• Class B (kWh) according to EN50470-3
• Class 1 (kWh) according to EN62053-21
• Class 2 (kvarh) according to EN62053-23
• Accuracy ±0.5 RDG (current/voltage)
• Energy meter
• Instantaneous variables readout: 3 DGT
• Energies readout: 6+1 DGT
• System variables: W, var, PF, Hz, Phase-sequence.
• Single phase variables: VLL, VLN, A, PF
• Energy measurements: total kWh and kvarh
• TRMS measurements of distorted sine waves
(voltages/currents)
• Self power supply
• Dimensions: 4-DIN modules and 72x72mm
• Protection degree (front): IP50
• Application adaptable display and programming
procedure (Easyprog function)
• Easy connections management
• Detachable display
Product Description
How to order EM21 72D AV5 3 X O X X
Three-phase energy meter
with removable front LCD
display unit. The same unit
can be used either as a
DIN-rail mounting or a panel mounting energy meter.
This general purpose threephase energy meter is suitable for both active and
reactive energy metering
for cost allocation but also
for main electrical parameter
measurement
and
retransmission (transducer
function). Housing for DINrail mounting with IP50
(front) protection degree.
Current measurements carried out by means of external current transformers
and voltage measurements
carried out either by means
of direct connection or by
means of potential transformers. EM21-72D is provided, as standard, with a
pulsating output for active
energy retransmission. In
addition a 2-wire RS485
communication
port
is
available as an option.
Model
Range code
System
Power supply
Output 1
Output 2
Option
Range codes
System
Power supply
Output 1
AV5 (*): 400VLL AC, 5(6)A or
1(6)A (***)
(CT connection)
AV6 (**):120VLN/230VLL AC
5(6)A or 1(6)A (***)
(VT/PT and
CT connections)
3 (*):
X (*): Self power supply
from 18V to 260VAC
VLN, 45 to 65 Hz
(connection VL1-N)
O (*):
Output 2
Options
X (*): None
S (**): RS485 port
X (*):
Type Selection
balanced and
unbalanced load:
3-phase, 4-wire;
3-phase, 3-wire;
2-phase, 3-wire;
1-phase, 2-wire
None
Specifications are subject to change without notice
Single static output
(opto-mosfet)
(*) as standard.
(**) on request.
(***) the range 1(6)A
is available but not in
compliance with the
EN50470-3 standard.
EM2172D DS ENG 280708
1
EM21 72D
Input specifications
Rated inputs
Current type
Current range (by CT)
Voltage (direct or by VT/PT)
Accuracy (Display + RS485)
(@25°C ±5°C, R.H. ≤60%,
48 to 62 Hz)
AV5 model
AV6 model
Current AV5, AV6 models
Phase-neutral voltage
Phase-phase voltage
Frequency
Active power
Power Factor
Reactive power
Active energy
Reactive energy
Energy additional errors
Influence quantities
Temperature drift
Sampling rate
Display refresh time
Display
Type
Instantaneous variables read-out
2
System type: 3
Not isolated (shunt inputs).
Note: the external current
transformers can be connected to earth individually.
AV5 and AV6: 5(6)A. The
“1(6)A” range is available
but not in compliance with
the EN50470-3 standard.
AV5: 400VLL;
AV6: 120/230VLL
In: see below, Un: see below
Energies
Overload status
Max. and Min. indication
LEDs
In: 5A, Imax: 6A; Un: 160 to
260VLN (277 to 450VLL).
In: 5A, Imax: 6A; Un: 40 to
144VLN (70 to 250VLL).
From 0.002In to 0.2In:
±(0.5% RDG +3DGT).
From 0.2In to Imax:
±(0.5% RDG +1DGT).
In the range Un: ±(0,5%
RDG +1DGT).
In the range Un: ±(1% RDG
+1DGT).
Range: 45 to 65Hz;
resolution: ±1Hz
±(1%RDG +2DGT).
±[0.001+1%(1.000 - “PF
RDG”)].
±(2%RDG +2DGT).
class B according to
EN50470-1-3;
class 1 according to
EN62053-21.
class 2 according to
EN62053-23.
In: 5A, Imax: 6A; 0.1 In:
0.5A.
Start up current: 10mA.
According to EN62053-21,
EN50470-1-3, EN62053-23
≤200ppm/°C.
1600 samples/s @ 50Hz,
1900 samples/s @ 60Hz
1 second
2 lines
1st line: 7-DGT,
2nd line: 3-DGT or
1st line: 3-DGT + 3-DGT,
2nd line: 3-DGT.
LCD, h 7mm.
3-DGT.
Max frequency
Measurements
Method
Coupling type
Crest factor
Current Overloads
Continuous
For 500ms
Voltage Overloads
Continuous
For 500ms
Current input impedance
5(6)A
Voltage input impedance
Self-power supply
Frequency
Key-pad
Imported Total: 6+1DGT or
7DGT
EEE indication when the
value being measured is
exceeding the “Continuous
inputs overload” (maximum
measurement capacity)
Max. instantaneous variables: 999; energies:
999 999.9 or 9 999 999.
Min. instantaneous variables: 0; energies 0.0.
Red LED (Energy consumption)
0.001 kWh by pulse if CT
ratio x VT ratio is <7;
0.01 kWh by pulse if CT
ratio x VT ratio is ≥ 7.0
< 70.0;
0.1 kWh by pulse if CT
ratio x VT ratio is ≥ 70.0
< 700.0;
1 kWh by pulse if CT ratio
x VT ratio is ≥ 700.0;
16Hz, according to
EN50470-3
Green LED (on the terminal
blocks side) for power on
(steady) and communication status: RX-TX (in case
of RS485 option only)
blinking.
See “List of the variables
that can be connected to:”
TRMS measurements of
distorted wave forms.
By means of external CT’s.
In 5A: ≤3 (15A max. peak).
6A, @ 50Hz.
120A, @ 50Hz.
1.2 Un
2 Un
< 0.3VA
Power consumption: <2VA.
45 to 65 Hz.
Two push buttons for variable selection and programming of the instrument working parameters.
Specifications are subject to change without notice
EM2172D DS ENG 280708
EM21 72D
Output specifications
Pulse output
Number of outputs
Type
Pulse duration
Output
Load
Insulation
RS485
Type
Connections
Addresses
1
Programmable from 0.01 to
9.99 kWh per pulses. Output connectable to the
energy meters (kWh)
≥100ms < 120ms (ON),
≥120ms (OFF), according
to EN62052-31.
Static: opto-mosfet.
VON 2.5 VAC/DC max. 70 mA,
VOFF 260 VAC/DC max.
By means of optocouplers,
4000 VRMS output to measuring inputs.
Protocol
Data (bidirectional)
Dynamic (reading only)
Static (reading and writing)
Data format
Baud-rate
Driver input capability
Insulation
MODBUS/JBUS (RTU)
System and phase variables: see table “List of
variables...”
All the configuration
parameters.
1 start bit, 8 data bit, no
parity,1 stop bit.
9600 bits/s.
1/5 unit load. Maximum
160 transceiver on the
same bus.
By means of optocouplers,
4000 VRMS output to measuring input.
Multidrop, bidirectional
(static and dynamic variables)
2-wire. Max. distance
1000m, termination directly
on the instrument.
247, selectable by means
of the front keypad
Software functions
Password
1st level
2nd level
Programming lock
System selection
System 3-Ph.n unbalanced load
System 3-Ph.1 balanced load
System 2-Ph
System 1-Ph
Numeric code of max. 3
digits;
2 protection levels of the
programming data:
Password “0”, no protection;
Password from 1 to 999, all
data are protected
By means of potentiometer
(back-side of the display
module) it is possible to
lock the access to all the
configuration parameters.
3-phase (4-wire)
3-phase (3-wire)
• 3-phase (3-wire) one current and 3-phase to phase
voltage measurements.
Note: the phase to phase
voltage is calculated multiplying by 1.73 the virtual
phase to neutral voltage.
• 3-phase (4-wire) one current and 3-phase to neutral
voltage measurements.
Note: the phase to phase
voltage is calculated multiplying by 1.73 the virtual
phase to neutral voltage.
• 3-phase (2-wire) one current and 1-phase (L1) to
neutral voltage measurement.
2-phase (3-wire)
1-phase (2-wire)
Specifications are subject to change without notice
Transformer ratio
VT (PT)
CT
Displaying
Reset
Easy connection function
EM2172D DS ENG 280708
1.0 to 99.9 / 100 to 999 /
1.00k to 6.00k
1.0 to 99.9 / 100 to 999 /
1.00k to 9.99k / 10.0k to
60.0k.
The maximum power being
measured cannot exceed
210 MW calculated as
maximum input voltage
and current, (see the
“Accuracy” paragraph).
The maximum VT by CT
ratio is 48.600. For MID
complaint applications the
maximum power being
measured is 25 MW.
Up to 3 variables per page.
See « Display pages » , 3
different set of variables
available (see « Display
pages ») according to the
metering function being
selected.
By means of the front keypad: total energies (kWh,
kvarh).
Wrong phase detection
and displaying. For all the
display selections, both
energy and power measurements are independent
from the current direction.
The displayed energy is
always “imported”.
3
EM21 72D
General specifications
Operating temperature
Storage temperature
Installation category
Insulation (for 1 minute)
Dielectric strength
Noise rejection CMRR
EMC
Electrostatic discharges
Immunity to irradiated
Electromagnetic fields
Burst
Immunity to conducted
disturbances
-25°C to +55°C (-13°F to
131°F) (R.H. from 0 to 90%
non-condensing @ 40°C)
according to EN62053-21
and EN62053-23.
-30°C to +70°C (-22°F to
158°F) (R.H. < 90% noncondensing @ 40°C)
according to EN62053-21
and EN62053-23.
Cat. III (IEC60664,
EN60664).
4000 VRMS between measuring inputs and digital
output.
4000 VRMS for 1 minute.
100 dB, 48 to 62 Hz.
According to EN62052-11
15kV air discharge;
Test with current: 10V/m
from 80 to 2000MHz;
Test without any current:
30V/m from 80 to
2000MHz;
On current and voltage
measuring inputs circuit: 4kV
Surge
Radio frequency suppression
Standard compliance
Safety
Metrology
Pulse output
Approvals
Connections
Cable cross-section area
Housing
Dimensions (WxHxD)
Material
Mounting
Protection degree
Front
Screw terminals
Weight
On current and voltage
measuring inputs circuit:
6kV;
According to CISPR 22
IEC60664, IEC61010-1
EN60664, EN61010-1
EN62052-11
EN62053-21, EN62053-23,
EN50470-3
DIN43864, IEC62053-31
CE
Screw-type
2.4 x 3.5 mm
Min./Max. screws tightening torque: 0.4 Nm / 0.8 Nm
72 x 72 x 65 mm
Noryl PA66,
self-extinguishing: UL 94 V-0
Panel and DIN-rail
IP50
IP20
Approx. 400 g (packing
included)
10V/m from 150KHz to
80MHz
Power supply specifications
Self power supply
18 to 260VAC (48-62Hz).
Across input “VL1” and “N”
Power consumption
≤2VA/1W
Insulation between inputs and outputs
Measuring Inputs
Opto-Mosfet output
Communication port
Self power supply
-
4kV
4kV
0kV
Opto-Mosfet output
4kV
-
-
4kV
Communication port
4kV
-
-
4kV
Self power supply
0kV
4kV
4kV
-
Measuring Inputs
NOTE: all the models have, mandatorily, to be connected to external current transformers.
4
Specifications are subject to change without notice
EM2172D DS ENG 280708
EM21 72D
Accuracy (According to EN50470-3 and EN62053-23)
kWh, accuracy (RDG) depending on the current
kvarh, accuracy (RDG) depending on the current
Percentage error limits for class index B
Percentage error limits
+1,5%
+1%
+2,5%
+2%
0%
0%
-1%
-1,5%
-2%
-2,5%
PF=1
0.05A(Imin) 0.25A(Itr)
5A (In)
6A (Imax)
sinϕ=1 0.1A
0.25A
5A (In)
6A (Imax)
PF=L0.5
to C0.8
0.25A(Itr)
5A (In)
6A (Imax)
sinϕ=0.5 0.25A
0.5A
5A (In)
6A (Imax)
Accuracy limits (Active energy)
Start-up current: 10mA
Accuracy limits (Reactive energy)
Start-up current: 10mA
EN50470-3 compliance
Accuracy
0.9 Un ≤ U ≤ 1.1 Un;
0.98 fn ≤ f ≤ 1.02 fn;
fn: 50 or 60Hz;
cosϕ: 0.5 inductive to 0.8
capacitive.
Class B
I st: 0.01A;
I min: 0.05A;
I tr: 0.25A;
Operating temperature
EMC compliance
I n: 5A
I max: 6A.
-25°C to +55°C (-13°F to
131°F) (R.H. from 0 to 90%
non-condensing @ 40°C)
E2
Used calculation formulas
Phase variables
System variables
Instantaneous effective voltage
Equivalent three-phase voltage
Instantaneous active power
Voltage asymmetry
Three-phase power factor
(TPF)
Energy metering
Instantaneous power factor
Instantaneous effective current
Instantaneous apparent power
Three-phase active power
Instantaneous reactive power
Three-phase apparent power
Specifications are subject to change without notice
EM2172D DS ENG 280708
Where:
i= considered phase (L1, L2 or L3)
P= active power; Q= reactive power;
t1, t2 =starting and ending time points
of consumption recording; n= time
unit;∆t= time interval between two
successive power consumptions;
n1, n2 = starting and ending discrete
time points of consumption recording
5
EM21 72D
List of the variables that can be connected to:
• RS485 communication port
• Pulse outputs (only “energies”)
No
Variable
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
kWh
kvarh
V L-N sys (1)
V L1
V L2
V L3
V L-L sys (1)
V L1-2
V L2-3
V L3-1
A L1
A L2
A L3
VA sys (1)
VA L1 (1)
VA L2 (1)
VA L3 (1)
var sys
var L1 (1)
var L2 (1)
var L3 (1)
W sys
W L1 (1)
W L2 (1)
W L3 (1)
PF sys
PF L1
PF L2
PF L3
Hz
Phase sequence
1-ph.
sys.
2-ph.
sys.
x
x
o
x
o
o
o
o
o
o
x
o
o
x
x
o
o
x
x
o
o
x
x
o
o
x
x
o
o
x
o
x
x
x
x
x
o
x
x
o
o
x
x
o
x
x
x
o
x
x
x
o
x
x
x
o
x
x
x
o
x
o
3-ph. 4-wire
balanced
system
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
3-ph. 3-wir
balanced
system
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
3-ph. 4-wire
unbalanced
system
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
3-ph. 3-wir
unbalanced
system
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Notes
Total
Total
sys=system (∑)
sys=system (∑)
sys=system (∑)
sys=system (∑)
sys=system (∑)
sys=system (∑)
(x) = available
(o) = not available (zero indication on the display)
(1) = Variable available only through the serial communication port RS485
Display pages
No
1st variable
(1st half-line)
2nd variable
(2nd half-line)
3rd variable
(2nd line)
The phase sequence tringle appears in
any page only if there is a phase reverse
Phase sequence
Total kWh
Total kvarh
1
2
3
W sys
kvar sys
PF sys
Hz
4
PF L1
PF L2
PF L3
5
6
7
A L1
V L1-2
V L1
A L2
V L2-3
V L2
A L3
V L3-1
V L3
6
Applications
A
B
C
Note
Indication of C, -C, L, -L depending on
the quadrant
Indication of C, -C, L, -L depending on
the quadrant
Specifications are subject to change without notice
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
EM2172D DS ENG 280708
EM21 72D
Additional available information on the display
Type
Meter information 1
Meter information 2
Meter information 3
Meter information 4
Meter information 5
Meter information 6
Meter information 7
1st line
2nd line
note
Y. 2007
value
SYS [3P.n]
Ct rAt.
Ut rAt.
PuLSE (kWh)
Add
r.A0
LEd (kWh)
value
value
value
value
value
Year of production and firmware release
KWh per pulse of the LED
System type and connection type
Current transformer ratio
Voltage transformer ratio
Pulse output: kWh per pulse
Serial communication address
List of selectable applications
Description
Notes
A
Active energy meter
Active energy measurement with some minor parameters
B
Active and reactive energy meter
Active and reactive energy measurement with some minor parameters
C
Full set of variables
Full set of available variables can be displayed
One instrument with double mounting capability
By means of the patented detachable display it is possible to configure the same instrument either as a panel
mounting meter or...
... as DIN-rail mounting meter.
Specifications are subject to change without notice
EM2172D DS ENG 280708
7
EM21 72D
Wiring diagrams
(6A) Self power supply, system type selection: 3P.n
3-ph, 4-wire, unbalanced load Fig. 1
V inputs
7 10 6
8
9
5
4
3
2
1
9
8
7 10 6
5
4
3
2
1
St
at
ic
R
S4
85
ou
tp
ut
6A inputs
3-ph, 4-wire, unbalanced load Fig. 2
3-CT connection
3-CT and 3-VT/PT connections
(6A) System type selection: 3P.n
Fig. 3
3-ph, 3-wire, unbalanced load
9
8
7 10 6
5
4
3
2
1
Fig. 4
3-ph, 3-wire, unbalanced load
9
8
7 10 6
5
4
3
2
3-ph, 3-wire, unbalanced load Fig. 5
9
1
8
(*)
(*)
3-CT connection
7 10 6
5
4
3
2
1
(*)
3-CT and 2-VT/PT connections
2-CT connections (ARON)
(6A) Self power supply, system type selection: 3P.1
3-ph, 3-wire, unbalanced load Fig. 6
3-ph, 3-wire, balanced load
Fig. 7
3-ph, 3-wire, balanced load
Fig. 8
1-CT connection
9
8
7 10 6
5
4
3
2
1
9
8
7 10 6
5
9
8
5
(*)
(*)
2-CT and 2-VT/PT connections ARON
7 10 6
NOTE: a 2-wire connection for voltage measurement is available accross 9 and 10 .
1-CT and 2-VT/PT connections
(*) NOTE: For a correct power supply of the instrument, the neutral must always be connected.
8
Specifications are subject to change without notice
EM2172D DS ENG 280708
EM21 72D
Wiring diagrams
(6A) System type selection: 2P
Fig. 9
2-ph, 3-wire
9
8 10
(6A) System type selection: 1P
6
5
4
3
9
2-CT connection
Fig. 10
2-ph, 3-wire
8 10
6
5
4
Fig. 11
1-ph, 2-wire
9
3
10
6
5
1-CT connection
2-CT and 2-VT/PT connections
Static output wiring diagram
(6A) System type selection: 1P
1-ph, 2-wire
9
10
Fig. 12
6
Opto-mosfet
VDC/AC
5
17
1-CT and 1-VT connections
18
VDC/AC supply
RS485 port wiring diagram
RS485 port
16
16
B+
15
B+
15
B+
A-
14
A-
14
A-
13
13
RS485 NOTE: additional devices provided with RS485 are connected as per the picture above. The termination of the serial
output is carried out only on the last instrument of the network, by means of a jumper between (B+) and (T).
Specifications are subject to change without notice
EM2172D DS ENG 280708
9
EM21 72D
Front panel description
5
4
1
2
3
1
4
1. Keypad
To program the configuration parameters and scroll the
variables on the display.
2. Pulse output LED
Red LED blinking proportional to the energy being
measured.
3. Display
LCD-type with alphanumeric indications to display all the
measured variables.
4. Connections
Screw terminal blocks for instrument wiring.
5. Green LED
Lit when power supply is available
Dimensions (DIN configuration)
Dimensions and panel cut out (72x72 panel mounting configuration)
68x68mm
-0 +0.7mm
10
Specifications are subject to change without notice
EM2172D DS ENG 280708