Lumel NA3 User manual

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DIGITAL-TO-ANALOGUE
METER WITH A MULTICOLOUR
BARGRAPH
+ SERIAL INTERFACE
NA3
SERvICE MANUAL

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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

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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.

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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.

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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

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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

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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
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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.

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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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- Key to increase the value
- display of the minimal value (first pressure), maximal (second pressure),
return to measurement (third pressure),
- mowing on the preview menu or programming matrix,
- change of the chosen parameter value - increasing of the value.
- Escape key
- entry into the menu of parameter preview (hold down ca 3 seconds),
- exit from the preview menu or programming matrix,
- escape from the parameter change.
The pressure and hold down the key during 3 seconds causes the entry
into the programming mode. The programming mode is protected by the
safety code.
The pressure and hold down the key during 3 seconds causes the entry
into the preview menu. One must move on the preview menu by means of the
key. In this menu, only all programmed parameters, except servicing
parameters, are accessible to readout. The exit from the preview menu is operated
by means of the key.
In the preview menu, it is also possible to review recorded resl values. The
pressure of the key on the resl parameter causes the entry into the
preview menu of recorded values. The number of the recorded result is displayed
alternately with the value e.g. The moving on recorded values
takes place by means of the key. The hold down of this key longer than ca
2 seconds will cause the acceleration of the review. The pressure of the key
in any time will cause the display of the number of recorded results. The exit from
the review of recorded values is operated by means of the key.
The algorithm of the meter servicing is presented on the fig. 5.

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Fig 5. Servicing algorithm of the NA3 meter.

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The appearance of the following symbols and inscriptions on the display means:
It is possible to change meter parameters:
- from the meter keyboard ..................................................................... - p. 5.1
- through RS-485.................................................................................... - p.6.
5.1. Change of the NA3 meter parameters from the keyboard
The pressure of the key during ca three seconds causes the display
of the seC inscription alternately with the set value 0 by the manufacturer. The
introduction of the correct code causes the entry into the programming mode. The
fig.6 represents the transition matrix into the programming mode. One can move on
groups of main parameters eg: Chn, bAr1, Al1, Al2, etc, by means of the key.
The pressure of the key on the given level, causes the entry into parameters
of this level. The moving on the given level is operated by means of the key.
In order to change the value, one must use the key. In order to escape
from the parameter change, one must press the key.
By means of the key, one can exit from the selected level and programming
matrix to the measurement.
During the meter operation in the programming mode the measurement result is
displayed on the bargraph, except the selection of the display testing function.
Exceeding of the lower measuring range or short-
circuited sensor
Error of the conductor resistance compensation.
No connected conductor or damaged conductor.
Incorrectly introduced safety code
Exceeding of the upper measuring range or lack
of sensor

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Parameters of the selected level
Item Main menu
1Input
type Math.
functions Kind of
compens. Decim.
points Measur.
time Input
individ.
charact.
Param.
of ind.
charact.
Bargraph
type Bargraph
colour Lower
bargraph Upper
bargraph
Lower
threshold Upper
threshold Alarm
type Alarm
delay Alarm
support Lower
colour Upper
colour
Lower
threshold Upper
threshold Alarm
type Alarm
delay Alarm
support Lower
colour Upper
colour
Output
indiv.
charac.
Param.
of indiv.
charac.
Baud
rate Kind of
transm. Device
adress
Inscrip.
of state
param.
Password
change Test of
display +
bargr.
Time
change
Erasing
of min.
value
Erasing
of max.
value
Recording Start of
recording Record
date. Record
interval
Lower
threshold Upper
threshold Alarm
type Alarm
delay Alarm
support Lower
colour Upper
colour
Param.
of indiv.
charac.
Param.
of indiv.
charac.
Param.
of indiv.
charac.
2 3 4 5 6 7 8
Param.
of ind.
charact.
Param.
of ind.
charact.
Param.
of ind.
charact.
Fig. 6. Transition matrix into the programming mode

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Fig. 7.

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Programmable parameters of NA3 meter Table 1
Range of changes
Kind of input
Input parameter
Reesistance thermometers:
pt1 - Pt100
pt5 - Pt500
pt10 - Pt1000
Thermocouples:
te-j - thermocouple, type J
te-h - thermocouple, type K
te-n - thermocouple, type N
te-e - thermocouple, type E
te-r - thermocouple, type R
te-s - thermocouple, type S
te-t - thermocouple, type T
re2l - resistance to 400 
re2H - resistance to 4 k
nap - voltage from shunt:
0... 60 mV
Standart signals:
3U - voltage up to 3 V
0U - voltage up to 10 V
nnal - current up to 5 mA
nnaH - current up to 20 mA
High signals:
200U - voltage up to 200 V
600U - voltage up to 600 V
2a - current up to 2 A
5a - current up to 5 A
Symbol
on the
display Parameter description
Mathematical functions
made in the channel 0ff - mathematical functions
switched off;
s)r - raising to a power (result)2
s)rt - extraction of roots result
typ
func
Chn

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Con
d_p
Cnt
1 n d1
Kind of compensation of sensor
working conditions changes:
- In case of a resistance thermometer
and resistance measurement it
concerns the compensation of the
resistance changes of the conductor
linking the sensor with the meter,
- In case of a thermocouple it concerns
the compensation of reference
junction temperature changes.
The automatic compensation does
not operate in case of a resistance
measurement up to 4 k, Pt1000
and Pt100
auto - automatic compensation
(in case of resistance thermometers and
resistance measurement it requires a
3-wire line.)
0.0...60.0C- value of the reference
temperature for thermocouples.
0.0...40.0 - resistance of two conduc-
tors for resistance thermometers and
resistance measurement.
The writing of a value beyond the interval
of manual compensation will cause the
automatic compensation switching
Setting possibility:
0000
000.0
00.00
0.000
Auto - automatic choice of the
decimal point
Setting of the decimal point. The
setting operates both when the
individual characteristic is switched
off and on. The introduction of the
decimal point making impossible
the display of four characters on the
display will cause the display of the
lower or upper exceeding.
0,0...999,9 s
The writing of 0 causes the switching of
the measurement off and the stoppage
of the meter operation. In this state, the
meter displays the hour. The bargraph
is blank.
Averaging time of the
measurement.
0n - characteristic switched on,
0ff - characteristic switched off.
When the characteristic is switched off,
the meter operates with the maximal
range depending on the kind of input.
The switching off or on of the indi-
vidual linear user’s characteristic.
- („individual characteristic of the
display”).
Parameters of the display
individual characteristic.
On the base of given by the user
coordinates of two points the meter
determines (from the system of
equations) a and b coefficients of
the individual characteristic.
Where:
I_H1 i I_H2 - measured value
d_Y1 i d_Y2 - expec-
ted value on
the display.
Fig.9 shows the way of the individual
1_H1
d_y1
1_H2
d_y2
Setting possibility: -1999...9999
Input parameter Chn

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typb
Bargraph Parameters bar
Bargraph type 0neC - „ one colour „ bargraph,
:ntr - „ interval „ bargraph,
sect - „ sector” bargraph,
p:nt - „ point bargraph,
tren -”trend” bargraph.
Fig. 10 explains bargraph types. .
Bargraph colour
colr 0ff - bargraph switched off,
r- red,
g- green,
rg - red + green
other colours are accessible only in
meters with a 7-colour bargraph.
b- blue,
rb - red + blue,
gb - green + blue,
rgb - red + green + blue.
brl Parameter to set the „magnifier”
on the bargraph. Lower threshold.
The value of the input signal at
which the bargraph is to be blank.
- 1999... 9999
brH Parameter to set the „magnifier”
on the bargraph. Upper threshold.
The value of the input signal at
which the bargraph is to be lighted.
- 1999... 9999
Parameters of alarm1, alarm2 and alarm 3
prl
prH
typa
- 1999... 9999
- 1999... 9999
Lower alarm threshold
Upper alarm threshold
Alarm type
Fig. 8 shows alarm types nor - normal,
0n - switched on,
0ff - switched off,
H_0n - manually switched on. Till
the time of the alarm type change,
the alarm output is being permanently
switched on.

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H_0f - manually switched off. Till
the time of the alarm type change,
the alarm output is being permanently
switched off.
dly
H0ld
Curl
CurH
0.0... 999.9
Introduction of 0.0 causes the ope-
ration at the moment of the alarm
occurrence.
Delay of the alarm operation. The
parameter is defined in seconds, i.e.
one must give the time in seconds
after which the alarm will operate after
its occurrence.
The alarm operation follows after
the measurement averaging.
The alarm switching off follows
without delay..
0ff - The maintenance of the alarm
output is switched off.
0n - The maintenance of the alarm
output is switched on.
Support of alarm signalling.
In the situation when the holding
function is switched on, after the
alarm state stoppage, the alarm is
still switched on (alarm diode, relay
or OC contacts).
The alarm state is active till the
moment of erasing it by means
of the combination of and
keys. Hold down within ca 3
seconds.
Parameters of alarm1, alarm2 and alarm 3 al1 al2 al3
Colour of the upper threshold
alarm marker.
Colour of the lower threshold
alarm marker. 0ff - alarm marker switched off.
r- red,
g- green,
rg - red + green,
Other colours are accessible only in
meters with a 7-colour bargraph.
b- blue,
rb - red + blue,
gb - green + blue,
rgb - red + green + blue,
Fig. 10 explains the idea of CurL and
CurH... parameters

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Output parameters 0ut
0n - characteristic switched on,
0ff - characteristic switched off .
When the characteristic is switched
off, the meter operates at the maximal
range depending on input and range
output.
Switching off or on of the individual
linear user’s characteristic - („indivi-
dual characteristic of the analog
output”).
:nd0
d-H1
0-y1
d-H2
0-H2
where:
d_H1 and d_H2 - displayed value
O_Y1 and O_Y2 - expected value
on the analog output.
Fig. 9 represents the graphical
illustration explaining the idea of the
individual characteristic.
Parameters of the individual cha-
racteristic of the analog output.
On the base of given coordinates of
two points by the user, the meter
determines (from the equation
system) coefficients a and b of the
individual characteristic.
Setting possibility: - 1999... 9999
baud
tryb
adr
Baud rate of the RS-485 interface.2400 - 2400 b/s
4800 - 4800 b/s
9600 - 9600 b/s
0ff - interface switched off
a8n1 - ASCII 8N1
a7e1 - ASCII 7E1
a7o1 - ASCII 7O1
r8n2 - RTU 8N2
r8e1 - RTU 8E1
r8o1 - RTU 8O1
r8n1 - RTU 8N1
Kind of transmission through the
RS-485 interface.
0...247
Device address