Lumel N20 Manuale utente

DIGITAL PANEL METER

N20

USER’S MANUAL

Contents

1. APPLICATION AND METER DESIGN ........................................ 5

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

3. BASIC REQUIREMENTS, OPERATIONAL SAFETY ................. 6

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

5. SERVICE...................................................................................... 9

6. ERROR CODES ........................................................................ 18

7. TECHNICAL DATA .................................................................... 19

8. EXECUTION CODES ................................................................ 22

9. MAINTENANCE AND GUARANTEE ........................................ 26

1. APPLICATION AND METER DESIGN

The N20 meter is a digital programmable panel instrument destined

for measurements of d.c. voltages or d.c. currents: unipolar or bipolar,

temperature through thermocouples (J, K) and Pt100 resistance

thermometers.

The readout eld is a LED display which enables the exposition of results

in red, green or orange colours. The eCon software is destined for the

conguration of the N20 meter. The N20 meter must be connected to the

PC computer through a PD14 programmer.

Following parameters can be reprogrammed:

– display colour, individually in three intervals,

– thresholds of displayed overows

– display precision of the result (decimal point),

– highlight of the unit,

– automatic or manual compensation: temperature of ends in

measurements with thermocouples, or wire resistance in Pt100

measurements,

– averaging time of the measurement,

– recalculation of indications (individual characteristic),

– two alarms of OC type operating in six working modes.

The alarm output switching on is signaled by the highlight of the triangular

alarm index situated at the left display side, for the suitable alarm digit.

The highlight colour is always different from the colour of the displayed

(measured) value. The meter has a galvanic separation between the

supply, measuring inputs and the programmer input.

The protection level from the frontal side is IP65.

Meter overall dimensions: 96 ´ 48 ´ 64 mm (including terminals).

Fig. 1. view of the N20 meter

2. METER SET

The set is composed of:

- N20 meter.................................................. 1 pc

- user’s manual............................................ 1 pc

- guarantee card .......................................... 1 pc

- clamps to x in the panel......................... 4 pcs

- seal............................................................ 1 pc

- set of labels with units ............................... 1 pc

When unpacking the meter, please check whether the type and execution

code on the data plate correspond to the order.

3. BASIC REQUIREMENTS

AND OPERATIONAL SAFETY

In the safety service scope, the N20 meter meets the

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 qualied, skilled

personnel, 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.

▪ The programming of meter parameters must be carried out when

measuring circuits are switched off.

▪ 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

period may cause its cancellation.

▪ The meter is destined to be installed and used in industrial

electromagnetic environment conditions.

4. INSTALLATION

The meter has separable strips with screw terminals which enable the

connection of external wires of 2.5 mm2. One must prepare a hole of

92+0.6 ´ 45+0.6 mm in the panel which the thickness should not exceed 6

mm. The meter must be introduced from the panel front with disconnected

supply voltage. Before the insertion into the panel, one must check the

correct placement of the seal. After the meter insertion into the hole, x

the meter by means of the clamps (g. 2.).

▪ One must remember that in the building installation, a switch or a

circuit-breaker should be installed. This switch should be located

near the device, easy accessible by the operator, and suitably

marked.

Fig. 2. Meter xing.

Fig. 3. Meter overall dimensions

4.1. Connection Diagrams

Resistance thermometer RTD

in a two-wire system with manual

compensation

Resistance thermometer RTD

in a three-wire system with automatic

compensation

Thermocouple J, K Current input

Voltage input

The supply must be connected by a two-wire cable, of a suitable wire

diameter, ensuring its protection by means of an installation cut-out.

Fig. 4. Electrical connections of the N20 meter

Fig. 5. Connections of measurement inputs

5. SERVICE

5.1. Display Description

5.2. Messages after the Supply Connection

After connecting the supply, the meter displays the N20 - L meter name

– where L is the letter marking the execution: U– voltage measurement,

I– current measurement, r– measurement of Pt100 temperature,

t – measurement of the temperature by thermocouples, s– custom-made

execution. Next, the program version is displayed in the shape r x.xx

– where x.xx is the number of the actual program version or the number

of the custom-made execution.

Till the time to obtain the required number of correct measurements (acc.

to the table 1), the actual value from the measurement 1 is displayed,

signaled by the highlighted index of the actual value.

In case of an error occurrence or an overow of the range value, a mes-

sage described in the section 6 will be displayed on the display.

Overows of the measuring range are additionally signaled by the actual

value signal index.

Alarm

indexes

Highlighted

unit

Measured

value

Indexes of actual value

displaying

Fig. 6. Frontal panel

5.3. Meter Configuration by Means of the eCon

software

The eCon software is destined for the N20 meter conguration.

One must connect the PC computer through the PD14 programmer and

congure the connection choosing Communication -> Serial port from

the menu (for the N20 meter we choose the address 1, baud rate 9600

kb/s, the mode RTU 8N2, timeout 1000ms and the appropriate port COM

under which the controller of the PD14 programmer has been installed).

CAUTION! One must carry out the programming of meter parameters

when measuring circuits are switched off!

Fig.7. Conguration of the connection with the N20 meter

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