Lumel NA3 Manuel utilisateur
1
DIGITAL-TO-ANALOGUE
METER WITH A MULTICOLOUR
BARGRAPH
+ SERIAL INTERFACE
NA3
SERvICE MANUAL
2
3
DIGITAL-TO-ANALOGUE
METER WITH A MULTICOLOUR
BARGRAPH
+ SERIAL INTERFACE
NA3 TYPE
CONTENTS Page
1. APPLICATION .............................................................................................5
2. SET OF THE METER ..................................................................................6
3. BASIC REQUIREMENTS, OPERATIONAL SAFETY..................................6
4. INSTALLATION............................................................................................7
5. SERVICING...............................................................................................10
6. RS-485 INTERFACE .................................................................................26
7. TECHNICAL DATA.....................................................................................43
8. BEFORE A FAILURE HAS BEEN DECLARED .........................................47
9. EXAMPLES OF NA3 METER PROGRAMMING.......................................48
10. ORDERING PROCEDURE .......................................................................51
4
5
1. APPLICATION
NA3 series meters with a multicoloured bargraph have an universal input destined
to measure temperature, resistance, voltage from shunts, standard signals, d.c.
voltage and d.c. current.
NA3 meters can optionally have a continuous analogue output, relays, OC type
(Open Collector) and digital RS-485 outputs.
They can find application in various industrial fields, e.g. food industry, intermediate
pumping stations, sewage treatment plants, chemical industry, weather stations,
breweries.
The NA3 meter is made in the version:
with a 4-digit LED readout field (digit height: 7 mm) and a multicolour
bargraph.
The type choice is made in the execution code.
They are programmed by means of the keyboard and through RS-485. Meters only
with the bargraph can be programmed through RS-485.
NA3 meters realise following functions:
– measurement of the input quantity and displaying it on the display and/or the
bargraph,
– evaluation of the input signal into indication on the base of the individual linear
characteristic,
– programming of the colour and bargraph resolutions,
– signalling of alarm value setting exceeding,
– recording of the measured signal in programmed time segments,
– storage of maximal and minimal values,
– programming of the indication resolution,
– programming of the measurement averaging time,
– locking of the parameter introduction by means of a password,
– conversion of the measured quantity into a voltage or current output signal,
– service of the RS-485 interface in MODBUS protocol, both in ASCII and RTU
mode.
Fig.1. View of the NA3 meter.
6
2. SET OF THE NA3 METER
We deliver in the set:
- NA3 meter .................................................... 1 pc.
- user’s guide.................................................. 1 pc.
- plug with screw terminals ............................. 1 pc
- holders to fix the indicator in the panel......... 2 pcs
When unpacking the meter, please check whether the type and execution code
on the data plate correspond to the order.
3. BASIC REQUIREMENTS, SAFETY INFORMATION
Symbols located in this service manual mean:
WARNING!
Warning of potential, hazardous situations. Especially important. One must
acquaint with this before connecting the NA3 meter. The non-observance
of notices marked by these symbols can occasion severe injuries of the
personnel and the damage of the instrument.
CAUTION!
Designates a general useful note. If you observe it, handling of the
meter is made easier. One must take note of this when the instrument is
working inconsistently to the expectations.
Possible consequences if disregarded !
In the security scope the NA3 meter meets the requirements of the EEC
Low-Voltage directive (EN 61010 -1 issued by CENELEC).
Remarks concerning the operator safety:
All operations concerning 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 connection
to the network.
Before taking the meter housing out, one must turn the supply off.
The removal of the instrument housing during the guarantee contract period
may cause its cancellation.
7
4. INSTALLATION
4.1. Fitting
Prepare a ( 22.2+0.5 x 92+0.5) mm hole in the panel. The thickness of the material from
which the panel is made should be in the range 1...15 mm.
The meter has screw terminal strips which enable the connection of 2.5 mm2cross-
section external conductors.
Meter dimensions are shown on the fig. 2.
4.2. External connection diagrams
The description of terminal strips are shown on the fig. 3a.
5
96
24
110
max115
Fig. 2. Meter overall dimension and fixing way.
a/ Description of the terminal strip
8
2 A and 5 A
current input
b/ Connection way of input signals
Resistance
thermometer in
two-wire system
Resistance
thermometer in
three-wire system
Thermocouple
or
0... 60 mV voltage
voltage input 5 mA and 20 mA
current input
RS-485 + 1 relay RS-485
+ 1 OC type output
(open collector)
2 relays
2 OC type outputs
Current or voltage
analogue output
c/ Connection way of digital and
analogue output signals,
depending on the execution code
9
1
2
5
3
4
supply
NA3 meter
1
2
5
3
4
...
AGND
B
B
A
PC Computer
PD51
3
10
9
2
1
GND
GND
A
B
RxD
TxD
DB9
2
5
PC Computer
with RS-485 card
DB9
61
95
supply
NA3 meter
3
d/ Connection way of the RS-485 interface
Fig.3 External connections of the NA3 meter
Taking into consideration electromagnetic interference it is recommended to use
shielded conductors for the connection of input and output signals.
The power supply must be connected by means of a two-wire conductor with a
suitable cross-section ensuring its protection by means of a fuse element.
Requirements concerning the power supply cable are regulated by EN 61010-1
p. 6.10. standard.
10
5. SERVICING
After connecting external signals and switching the meter on, its name
and also the current version of the program, e.g. are displayed.
After ca 3 seconds, the meter is transiting automatically into the working mode
in which it carries out the measurement and the display of the measured value
on the display and the bargraph. Depending on alarm and bargraph parameter
settings, alarm thresholds are also displayed on the bargraph. The meter blanks
automatically insignificant zeros.
Key functions:
- acceptation key
- entry into the programming mode (hold down during ca 3 seconds),
- entry into the chosen parameter level,
- entry into the changing mode of the parameter value,
- acceptation of the changed parameter value.
NA3
0102030405060708090 100
Lower alarm threshold
Escape key Acceptation
key
Increasing value key
45-element bargraph (in three-colour execution)
25-element bargraph (in seven-colour execution)
Upper alarm threshold
Fig. 4 Description of the NA3 frontal plate.
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1
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