Lumel N20 Manuel utilisateur
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DIGITAL PANEL METER
N20
USER’S MANUAL
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3
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
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5
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
conguration 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 overows
– 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
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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 qualied, 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.
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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
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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
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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 overow of the range value, a mes-
sage described in the section 6 will be displayed on the display.
Overows 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
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5.3. Meter Configuration by Means of the eCon
software
The eCon software is destined for the N20 meter conguration.
One must connect the PC computer through the PD14 programmer and
congure 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. Conguration of the connection with the N20 meter
Autres manuels pour N20
1
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