Lumel ND20 Manuale utente

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METER OF NETWORK PARAMETERS

ND20

USER’S MANUAL

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3

Contents

1. APPLICATION ................................................................... 5

2. METER SET ...................................................................... 6

3. BASIC REQUIREMENTS AND OPERATIONAL SAFETY ..................... 6

4. INSTALLATION .................................................................. 7

5. METER DESCRIPTION .......................................................... 8

6. ND20 PROGRAMMING ........................................................ 12

7. UPDATING OF SOFTWARE.................................................... 35

8. RS-485 INTERFACE ............................................................ 37

9. ERROR CODES ................................................................. 60

10. TECHNICAL DATA .............................................................. 62

11. VERSION CODES ............................................................... 66

12. MAINTENANCE AND GUARANTEE ........................................... 68

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5

1. APPLICATION

The N20D meter is a digital programmable panel meter destined for

the measurement of single-phase power network parameters (2-wire

network) and 3-phase, 3,4-wire network in balanced and unbalanced

systems with the simultaneous display of measured quantities on a LCD

display. The meter enables the control and optimization of power elec-

tronics devices, systems and industrial installation operations.

The meter ensures the measurement of: rms values of voltage and

current, active, reactive and apparent power, active, reactive ener-

gy, power factors, frequency, 15, 30, 60 minutes’ mean active power,

archive of power profile, THD and harmonic measurements. Additio-

nally, the current value in the neutral wire is calculated. Voltages and

currents are multiplied by given voltage and current ratios of measuring

transformers. Indications of power and energy take into consideration

values of programmed ratios. The value of each measured quantity

can be transmitted to the master system through the RS-485 interface.

The relay output signals the overflow of the chosen quantity, and the

pulse output can be used for the consumption check of 3-phase active

and reactive energy.

The meter has additionally a continuous current output.

The meter has a galvanic separation between respective blocks:

- supply,

- measuring inputs,

- voltage and current inputs,

- analog output,

- RS-485 output,

- impulse output.

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2. METER SET

3. BASIC REQUIREMENTS AND

OPERATIONAL SAFETY

The set of the ND20 meter is composed of:

1. ND20 meter ........................................... 1 pc.

2. user’s manual ....................................... 1 pc.

3. guarantee card ...................................... 1 pc

4. seal........................................................ 1 pc.

5. holders to fix the meter in the panel... 4 pcs

In the safety service scope, the ND20 meter meets to requirements of

the EN 61010 -1 standard.

Observations Concerning the Operational Safety:

· All operations concerning transport, installation, and commissioning

as well as maintenance, must be carried out by qualified, skilled per

sonnel, and national regulations for the prevention of accidents must

be observed.

· Before switching the meter on, one must check the correctness

of connection to the network.

· Before removing the meter housing, one must switch the supply off

and disconnect measuring circuits

· The removal of the meter housing during the guarantee contract pe-

riod may cause its cancellation.

· The ND20 meter is destined to be installed and used in industrial

electromagnetic environment conditions.

· One must remember that in the building installation, a switch or a cir-

cuit-breaker should be installed. This switch should be located near

the device, easy accessible by the operator, and suitably marked.

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Fig. 1. Meter fitting

Fig. 2 Meter overall dimensions

4. INSTALLATION

The ND20 meter is adapted to be fixed on a panel by means of holders.

The fitting way is presented on the fig.1.

Housing overall dimensions: 96 x 96 x 77 mm. At the rear side of the

meter, there are screw terminal strips which enable the connection of

external wires with a cross-section up to 2.5 mm2.

One must prepare a 92.5+0.6 x 92.5+0.6 mm cut-out in the panel. The material

thickness which the panel is made from should not exceed 15 mm.

Insert the meter from the frontal panel side with the disconnected sup-

ply voltage. After the insertion into the hole, fix the meter by means of

holders.

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5. METER DESCRIPTION

5.1 Current Inputs

All current inputs are galvanically isolated (internal current transfor-

mers). The meter is adapted to co-operate with external measuring cur-

rent transformers. Displayed current values and derivative quantities

are automatically recoun in relation to the introduced external current

transformer ratio. Current inputs are defined in the order as 1 A or 5 A.

5.2 Voltage Inputs

Quantities on voltage inputs are automatically converted acc. to the

introduced ratio of the external voltage transformer. Voltage inputs are

defined in the order as 3 x 57.7/100 V, 3 x 230/400 V.

5.3 Connection Diagrams

a)

Direct, semi-direct

and indirect

single-phase

measurement

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Direct measure-

ment in a 3-wire

network

b)

Supply OUpulse OUA1

Semi-indirect

measurement

in a 3-wire

network

10

c)

Direct measurement

in a 4-wire network.

Supply OUA1

OUpulse Indirect measurement

with the use of 2 current

transformers and 2 or 3

voltage transformers

in a 3- wire network

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