Lumel N21 User manual

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PANEL MOUNTED METER
N21
USER’S MANUAL

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Contents
1. APPLICATION AND METER DESIGN.............................................. 5
2. METER SET .......................................................................... 6
3. BASIC REQUIREMENTS, OPERATIONAL SAFETY .............................. 6
4. INSTALLATION ...................................................................... 8
4.1. Mounting ....................................................................... 8
4.2. External Connection Diagrams ............................................. 9
5. SERVICE............................................................................. 11
5.1 Display description........................................................... 11
5.2 Power-on status indication.................................................. 11
5.3 Device configuration using e-Con program...............................12
5.3.1 Configuration parameters................................................. 14
5.3.2 Alarm output operating modes...........................................18
5.3.3 Individual characteristic .................................................. 20
5.3.4 BArgraph configuration.................................................... 21
5.3.5 Preview of the measuring values........................................ 23
5.3.6 Editor of the measuring unit.............................................. 23
6. CONFIGURATION INTERFACE.................................................... 25
6.1 USB Interface – list of parameters ......................................... 25
6.2 Map of N21 meter registers ................................................. 25
7. ERROR CODES ..................................................................... 32
8. SOFTWARE UPDATE .............................................................. 34
9. TECHNICAL DATA.................................................................. 36
10. ORDERING CODE................................................................. 40

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1. APPLICATION AND METER DESIGN
The N21 meter is a digital programmable panel mounted instrument
designed to measure d.c. voltages or d.c. currents: unipolar or bipolar,
temperature with use of thermocouples J (Fe-CuNi), K (NiCr-NiAl)
and Pt100 resistance thermometers. The readout field is an OLED
graphic display with a resolution of 32x128 points.
The eCon program is designed for the configuration of the N21 meter.
The meter should be connected to a PC via a miniUSB connector
located on the rear of the meter. Following parameters can be set:
• measuring input
• display precision of the result (decimal point)
• relay output operating mode
• thresholds triggering the relay output
• time delays of the relay output triggering
• individual characteristic for measuring signal
• automatic or manual temperature compensation of cold junctions
• averaging time of the measurement
• user-defined units of measured signal
• display language
• bargraph configuration.
Meter output signals are isolated from the input signals and power supply.
Figure 1. View of the meter
a) horizontal b) vertical

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2. METER SET
Complete set of the meter includes:
- N21 meter.................................................. 1 pc
- clamps to fix in the panel......................... 4 pcs
- seal............................................................ 1 pc
- user’s manual............................................ 1 pc
- guarantee card .......................................... 1 pc
3. BASIC REQUIREMENTS,
OPERATIONAL SAFETY
The symbols in the manual mean:
Warning!
Warning of potentially hazardous situations. Especially
important to be aware of before connecting the device.
Failure to follow the directions marked by this symbol
could result in serious injuries of the personnel and dama-
ge of the device.
Caution!
Useful notes. The notes should facilitate the operation
of the device. Should pay attention, if the device is not
working as expected.
Possible consequences in case of ignoring informa-
tion!
Accessories:
For the N21 meter you can order:
– USB CABLE A/miniUSB-B - 1m BLACK; Order code 20-069-00-
00150.

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In terms of operational safety the meter meets the requirements
of the EN 61010-1 standard.
Comments concerning safety:
• Assembly and installation of the electrical connections should be
made only by people authorized to perform assembly of electric
devices.
• The person installing the meter is responsible for ensuring
the safety of the implemented system.
• Always check the connections before turning the meter on.
• Opening the meter housing gives access to the live parts.
The supply must be switched off and the measuring circuits discon-
nected before removing the meter housing.
• Removal of the meter housing cover during the warranty period
voids the warranty.
• The meter is designed to be installed and used in the industrial
electromagnetic environment conditions.
• The building installation should have a switch or a circuit-breaker
installed. This switch should be located near the device, easy
accessible by the operator and suitably marked.
• In case of damage, the meter can to repaired only by manufacturer’s
authorized service.
• Check the correct operation of the meter before it is used for mea-
suring after a repair.
• Connection and/or using the meter in a way which is not compliant
with the user’s manual, may cause deterioration of the degree
of protection.

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Figure 2. Meter fitting
Figure 3. Meter dimensions
4. INSTALLATION
4.1. Mounting
The N21 meter has separable strips with the screw terminals which
enable the connection of external supply wires of 2.5 mm2and signal
wires of 1.5 mm2.
You must prepare a 92+0,6 x 45+0,6 mm cut-out in the panel. The thi-
ckness of the panel material should not exceed 6 mm. The meter
should be mounted from the panel front with disconnected supply volta-
ge. Check the correct position of the seal before placing the meter into
the panel. When the panel is inserted in the slot, mount it in the panel
with the mounting brackets (Fig. 2).

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4.2.External Connection Diagrams
USB
conguration
+
measurement signals
24 V d.c.
30 mA max
(supply of object transducers)
alarm 24 V N 230 V
supply
Figure 4. Electrical connections of the N21 meter
Comment concerning safety:
The meter is provided with a universal power supply that allows
operation in a wide range of input voltages 22..253V a.c / 20..300V d.c.
Life-threatening voltage also appears at the terminal 12 of the meter
in the case of the use of the input terminals 13-14.

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123
456
-+
123
456
-+
current input ±20mA voltage input ±10V
Figure 5. Connections of measuring signals
123
456123
456
Resistance thermometer
in a 2-wire system
Resistance thermometer
in a 3-wire system
123
456
123
456
thermocouple J,K voltage input ±75mV