CARLO GAVAZZI EM21 - COMMUNICATION PROTOCOL V1 REV0 Bedienungsanleitung PDF herunterladen (Seite 3)

Specifications are subject to change without notice EM2172D DS ENG 280708 3

EM21 72D

Protocol MODBUS/JBUS (RTU)

Data (bidirectional)

Dynamic (reading only) System and phase vari-

a

bles: see table “List of

variables...”

Static (reading and writing) All the configuration

parameters.

Data format 1 start bit, 8 data bit, no

parity,1 stop bit.

Baud-rate 9600 bits/s.

Driver input capability 1/5 unit load. Maximum

160 transceiver on the

same bus.

Insulation By means of optocouplers,

4000 VRMS output to mea-

suring input.

Pulse output

N

umber of outputs 1

T

ype Programmable from 0.01 to

9.99 kWh per pulses. Out-

put connectable to the

energy meters (kWh)

Pulse duration

≥100ms < 120ms (ON),

≥120ms (OFF), according

to EN62052-31.

Output Static: opto-mosfet.

L

oad V

ON

2

.5 VAC/DC max. 70 mA,

V

O

FF

2

60 VAC/DC max.

Insulation By means of optocouplers,

4000 VRMS output to mea-

suring inputs.

RS485

Type Multidrop, bidirectional

(static and dynamic vari-

ables)

Connections 2-wire. Max. distance

1000m, termination directly

on the instrument.

Addresses 247, selectable by means

of the front keypad

Output specifications

Transformer ratio

VT (PT) 1.0 to 99.9 / 100 to 999 /

1.00k to 6.00k

CT 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.

Displaying 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.

Reset By means of the front key-

pad: total energies (kWh,

kvarh).

Easy connection function Wrong phase detection

and displaying. For all the

display selections, both

ener

gy and power mea

-

surements are independent

from the current direction.

The displayed energy is

always “imported”.

Password Numeric code of max. 3

digits;

2 protection levels of the

programming data:

1st level Password “0”, no protec-

tion;

2nd level Password from 1 to 999, all

data are protected

Programming lock By means of potentiometer

(back-side of the display

module) it is possible to

lock the access to all the

configuration parameters.

System selection

System 3-Ph.n unbalanced load 3-phase (4-wire)

3-phase (3-wir

e)

System 3-Ph.1 balanced load

•

3-phase (3-wire) one cur

-

rent and 3-phase to phase

voltage measurements.

Note: the phase to phase

voltage is calculated multi-

plying by 1.73 the virtual

phase to neutral voltage.

• 3-phase (4-wire) one cur-

r

ent and 3-phase to neutral

voltage measurements.

Note: the phase to phase

voltage is calculated multi-

plying by 1.73 the virtual

phase to neutral voltage.

• 3-phase (2-wire) one cur-

rent and 1-phase (L1) to

neutral voltage measur

e-

ment.

System 2-Ph 2-phase (3-wire)

System 1-Ph 1-phase (2-wire)

Software functions

1 2 3 4 5 6 7 8 9 10

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