CARLO GAVAZZI EM21 - COMMUNICATION PROTOCOL V1 REV0 Manual de usuario descargar pdf (Pagina 2)

2 Specifications ar

e subject to change without notice EM2172D DS ENG 280708

EM21 72D

R

ated inputs

S

ystem type: 3

C

urrent type Not isolated (shunt inputs).

Note: the external current

transformers can be con-

nected to earth individually.

Current range (by CT) AV5 and AV6: 5(6)A. The

“1(6)A” range is available

but not in compliance with

t

he EN50470-3 standard.

V

oltage (direct or by VT/PT) AV5: 400VLL;

A

V6: 120/230VLL

Accuracy (Display + RS485) In: see below, Un: see below

(@25°C ±5°C, R.H.

≤60%,

48 to 62 Hz)

AV5 model In: 5A, Imax: 6A; Un: 160 to

260VLN (277 to 450VLL).

AV6 model In: 5A, Imax: 6A; Un: 40 to

144VLN (70 to 250VLL).

Current AV5, AV6 models From 0.002In to 0.2In:

±(0.5% RDG +3DGT).

From 0.2In to Imax:

±(0.5% RDG +1DGT).

Phase-neutral voltage In the range Un: ±(0,5%

RDG +1DGT).

Phase-phase voltage In the range Un: ±(1% RDG

+1DGT).

Frequency Range: 45 to 65Hz;

resolution: ±1Hz

Active power ±(1%RDG +2DGT).

Power Factor ±[0.001+1%(1.000 - “PF

RDG”)].

Reactive power ±(2%RDG +2DGT).

Active energy class B according to

EN50470-1-3;

class 1 according to

EN62053-21.

Reactive energy class 2 according to

EN62053-23.

In: 5A, Imax: 6A; 0.1 In:

0.5A.

Start up curr

ent: 10mA.

Energy additional err

ors

Influence quantities According to EN62053-21,

EN50470-1-3, EN62053-23

T

emperature drift

≤200ppm/°C.

Sampling rate 1600 samples/s @ 50Hz,

1900 samples/s @ 60Hz

Display refresh time 1 second

Display 2 lines

1

st

line: 7-DGT,

2

nd

line: 3-DGT or

1

st

line: 3-DGT + 3-DGT,

2

nd

line: 3-DGT.

Type LCD, h 7mm.

Instantaneous variables read-out 3-DGT.

Energies Imported Total: 6+1DGT or

7DGT

O

verload status EEE indication when the

v

alue being measured is

exceeding the “Continuous

inputs overload” (maximum

measurement capacity)

Max. and Min. indication Max. instantaneous vari-

ables: 999; energies:

999 999.9 or 9 999 999.

Min. instantaneous vari

-

a

bles: 0; energies 0.0.

LEDs Red LED (Energy con-

sumption)

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;

Max frequency 16Hz, according to

EN50470-3

Green LED (on the terminal

blocks side) for power on

(steady) and communica-

tion status: RX-TX (in case

of RS485 option only)

blinking.

Measurements See “List of the variables

that can be connected to:”

Method TRMS measurements of

distorted wave forms.

Coupling type By means of external CT’s.

Cr

est factor

In 5A: ≤

3 (15A max. peak).

Current Overloads

Continuous 6A, @ 50Hz.

For 500ms 120A, @ 50Hz.

V

oltage Overloads

Continuous 1.2 Un

For 500ms 2 Un

Curr

ent input impedance

5(6)A < 0.3V

A

Voltage input impedance

Self-power supply Power consumption: <2VA.

Frequency 45 to 65 Hz.

Key-pad T

wo push buttons for vari-

able selection and pro-

gramming of the instru-

ment working parameters.

Input specifications

1 2 3 4 5 6 7 8 9 10

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