Lumel N20Z TYPE User manual

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USER’S MANUAL
DIGITAL
PANEL METER
N20Z TYPE

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Contents
1. APPLICATION and METER DESIGN........................................... 5
2. METER SET ...................................................................... 5
3. BASIC REQUIREMENTS, OPERATIONAL SAFETY .......................... 6
4. INSTALLATION .................................................................. 7
5. SERVICE.......................................................................... 9
6. ERROR CODES ................................................................. 19
7. TECHNICAL DATA .............................................................. 19
8. ORDER CODES ................................................................. 22
9. MAINTENANCE and GUARANTEE ............................................ 26

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2. METER SET
The set is composed of:
- N20Z meter ......................................... 1 pc
- User’s manual ..................................... 1 pc
- Guarantee card................................... 1 pc
- Clamps to fix in the panel ................... 4 pcs
1. APPLICATION and METER DESIGN
The N20Z meter is a digital programmable panel instrument destined
for measurements of a.c. voltages, a.c. currents, or frequency.
The readout display is a LED display which enables the exposition of
results in red, green or orange colour.
The LPCon program is destined for the configuration of the N20Z meter.
The meter must be connected with the PC computer through a PD14
converter.
Parameters which can be reprogrammed are as follows:
- display colour, individually in three intervals,
- thresholds of displayed overflows,
- display precision of the result (decimal point),
- highlight of the unit,
- kind of the measured signal a.c. or a.c. + d.c. (True RMS),
- averaging time of the measurement,
- recounting of indications (individual characteristic),
- two alarms of OC type operating in six working modes.
The switching of the output alarm on is signaled by the highlight of the
triangular alarm index, at the left side of the display for the suitable
alarm digit
The highlight colour is always different from the colour of the displayed
(measured) value. The protection level from the frontal side is IP 65.
Meter overall dimensions: 96 48 64 mm (including terminals).

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3. BASIC REQUIREMENTS,
OPERATIONAL SAFETY
In the safety service scope, the 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 qualified, skilled
personnel, and national regulations for the prevention of accidents
must be observed.
· Before switching the meter on, one must check the correctness
of connections to the network.
· Do not connect the meter to the network through an
autotransformer.
· 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 fulfills requirements related to electromagnetic
compatibility in the industrial environment
· When connecting the supply, one must remember that a switch or a
circuit-breaker should be installed in the building. This switch should
be located near the device, easy accessible by the operator, and
suitably marked as an element switching the meter off.
· Non-authorized removal of the housing, inappropriate use,
incorrect installation or operation, creates the risk of injury to
personnel or meter damage.
For more detailed information, please study the User’s Manual.
- 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.

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Fig. 1 Meter fixing.
Fig. 2 Overall meter dimensions
4. INSTALLATION
The meter has separable strips with screw terminals which enable the
connection of external wires of 2.5 mm2cross-section. In execution for
current measurement, the plug enables a permanent fixing to the so-
cket by means of screws.
One must prepare a hole of 92 +0.6 x 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 insertion into the hole, fix the meter by means of clamps (fig. 1).

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4.1. Connection diagrams
Fig. 3 Electrical connections of the N20Z meter for voltage
and frequency measurements
Fig. 4 Electrical connections of the N20Z meter for a.c. current
measurements

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5. SERVICE
5.1. Display description
Fig. 5 frontal panel
5.2. Messages after the supply connection
After connecting the supply, the meter displays the N20ZL meter name
– where Lis the letter marking the execution: U– voltage measurement,
I– current measurement, F– frequency measurement, 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 dis-
played, signaled by the highlighted index of the actual value.
In case of an error occurrence or an overflow of the range value on the
display, a message described in the section 6, will be displayed.
Overflows of the measuring range are additionally signaled by the actual
value signal index.
Alarm
indexes
Highlighted
unit
Measured
value
Index displaying the
current value

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5.3. Meter configuration by means of the
LPCon program
The LPCon program is destined to configure the N20Z meter. One must
connect the meter to the PC computer through the PD14 programmer and
after choosing the menu Options-> Connection configuration, configure
the connection (we choose for the N20Z meter, the address 1, baud rate
9600 kb/s, RTU 8N2 mode, timeout 1000 ms and the suitable COM port
under which the PD14 programmer controller has been installed).
CAUTION! One must carry out the programming of meter parame-
ters when measuring circuits are switched off!
Fig.6. Configuration of the connection with the N20Z meter