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EMM-R4h EMM-

μ

4h 

instruction manual 

IM441-U v0.7 

pag. 15  

COMMUNICATION INTERFACE EIA485 (RS485)

 

It is possible to exchange information between the instrument and a PC, PLC or other compatible system, through the 
asynchronous serial line RS485. The interface EIA485 allows a multi-drop connection, in order to connect various 
instruments in the same network. The maximum suggested length for a RS485 connection is 1200m. For longer 
distances provide the use of low attenuation cables or signal amplifiers. On the same RS485 it is possible to install up to 
32 units, beyond this number of units it is required to place a signal repeater, each one of them will be able to manage up 
to 32 instruments. The higher is the number of connected instruments on the same serial line, the lower will be their 
response speed. 

 
 

Not shielded connection 

As shown in the diagram, it is necessary to place a serial 
RS232/485 converter between the RS232 PC's outlet and 
the instrument/s. 
it’s necessary to insert a line termination resistance 
(Rt=100÷120 ohm) between the twisted pair of cables, 
placing it between the converter and the end of the network 
(last instrument connected). Use always twisted cables with 
minimum section of 0,36mm

2

 (22AWG) and lower capacity 

of 60 pF/m (i.e.: BELDEN cable type EIA RS485-
Ref.3105A). 
 
 
 
 

Shielded connection 

Should it be the case of long distance networks, ambiences 
where there have been placed energy transporting cables or 
ambiences subject to be electrically disturbed, it is 
suggested to use 100÷120ohm 1/2W resistors, placed 
between the common of the RS485 outlet and the shielded 
cable. 
 
 
 
 
For other information on the serial line it’s better to see the manual of EMI1 serial converter. 
 

DIMENSIONS 

R S48 5/2 32   con ve rte r 

Max 32 EMM; max  300 meters

R=120

A1

B1

A2

B2

serial converter

C1

R1*

R2*

C2

LINE 1

LINE 2

]

]

RS232

RS485

CONNECTION WITH NOT SHIELDED CABLE

PERSONA

L COMPUT

ER

RS485/ 232 converter 

PERSONA

L COMPU

TER

Max 32 EMM; max  1200 meters

R=120

A1

B1

A2

B2

serial converter

C1

R1*

R2*

C2

LINE 1

LINE 2

]

]

RS232

RS485

CONNECTION WITH SHIELDED CABLE

68

68

R3

72

72

cut panel

72

81

14

9

65

.8

EMM-µ4h

L

L1

L2

L3

electrical

multi meter

kWh

kVArh

...h

V

A

P.F.

W

VAr

VA

V

L-N

L-L

V

L-N

Hz °C

V

L-L

alarm

k

max

avg

maxD

max

avg

K

M

92

92

R3

96

96

90

96

56

9

20

cut panel

k

M

k

V

L-N

L1

L2

L3

L

Hz

electrical

multi meter

V

A

P.F.

W

VAr

VA

V

L-N

L-L

°C

V

L-L

alarm

kWh

kVArh

...h

max

avg

max

maxD

avg

EMM-R4h

Содержание EMM-M4H

Страница 1: ...c OPTIONS internal CT digital output in alternative to the serial port serial port in alternative to the digital output power supply different from standard version current input 1A MEASURED PARAMETERS parameters unit of measurement initial identification phase and three phase voltages 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...

Страница 2: ...tage 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 to apply the ins...

Страница 3: ...TION ON THREE PHASE LINE WITH 4 WIRES AND 3 VT 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 conneccted LOAD EMM P1 S1 P1 P1 P2 S1 S1 S2 N L1 L2 L3 N L1 L2 L3 ...

Страница 4: ... P2 S1 S2 N L1 L2 L3 AMPEROMETRIC INSERTION ON THREE PHASE LINE WITH 2CT AARON insertion VOLTAGE INSERTION ON THREE PHASE LINE WITH 3 WIRES AND 2 VT This voltage insertion is possible only with the version with internal CT t suffix LOAD EMM L1 L2 L3 S2 S2 S1 S1 P2 P2 P1 P1 ...

Страница 5: ...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 Only for models with power supply phase neutral Vaux L3 N N L ...

Страница 6: ...D E energy counters excluded The voltage values are referred to the three phase system The k LED displays the reading in kilo x1000 Using the C key the display indicates the type of the energy displayed Using the A and B keys the display indicates the type of average or maximum value A C when pressing simultaneously the instrument pass to the following menu instrument programming SETUP energy coun...

Страница 7: ...0 kW kVAr pulse version with digital output 01 0 kW kVAr pulse 0 10 kW kVAr pulse 0 01 kW kVAr pulse seT TPL Increase from 100 to 500 mS in step by 100 mS Decrease version with digital output seT ID ADR Increase Set address of network from 001 to 127 Decrease version with serial output seT SER BDR Set baud rate 19200 baud 19 2 serial interface 9600 baud 9 60 version with serial output 4800 baud 4 ...

Страница 8: ... energy visualization type after the visualization of the temperature With TOT PAR will have the visualization of the partial and total energy counters With NORMAL there will be only the visualization of total counters that it s possible to reset from RESET menu Programming insertion mode 3PH In a unbalance three phase system it s necessary to set UN_BAL unbalance while in a balance system only on...

Страница 9: ...um values and all energy hours counters 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 RESET PEA NO YES Confirm Reset Deleting maximum values max RESET AVG NO YES Confirm Reset Deleting average values avg and maximum demand maxD RESET EN NO YES Confirm Reset Deleting energy counters RESET ALL NO YES Confirm Reset Delet...

Страница 10: ...ress A key 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 B and C keys until the parameter choice appears on the third part L3 of F display and the glowing the corresponding led on the D bar Press A key to confirm the set SET THE HIGH AND THE LOW THRESHOLDS On F display ...

Страница 11: ...eresis 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 condit...

Страница 12: ...ore time the B key to select the parameter and the A key to confirm it SET THE THRESHOLD Subsequently it s necessary to set the threshold using the B to increase and C to decrease keys Confirm with A key I O INFO PAGE After the hour counter set the I O info page appears in F displays on the second part L2 the status of the first digital output DO1 on the third part L3 the status of the second digi...

Страница 13: ...same way of the section 1 press the C button to select the parameter that can be displayed and indicated from E LED The voltage values are of the three phase system the frequency is of the L3 channel Visualization energy and hours counters With the C key it s possible to visualize on F display the active reactive and apparent energy counters One segment of the right digit of the G display in corre...

Страница 14: ...hase currents I L1 max avg I L2 max avg I L3 max avg max maxD avg maximum of average phase currents max demand three phase power W max avg VAr max avg VA max avg max maxD avg maximum of average three phase powers maximum demand phase currents I L1 avg I L2 avg I L3 avg max maxD avg average phase currents three phase power W avg Var avg VA avg max maxD avg average three phase powers NOTE relative t...

Страница 15: ...verter and the end of the network last instrument connected Use always twisted cables with minimum section of 0 36mm2 22AWG and lower capacity of 60 pF m i e BELDEN cable type EIA RS485 Ref 3105A Shielded connection Should it be the case of long distance networks ambiences where there have been placed energy transporting cables or ambiences subject to be electrically disturbed it is suggested to u...

Страница 16: ...ires 4 wires and single phase insertion in MT with external TV and transforming rate programmable from 0 1 to 400 0 current inputs from 0 02 to 5A permanent overload 30 from external TA with secondary 5A primary programmable from 5 to 10000A auto consumption 0 5VA INPUTS OUTPUTS digital outputs Two outputs with common optomos 12 230Vac dc max 150mA Insulation 3kV for 60 second Pulse Function Weigh...

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