ST N30U User manual

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DIGITAL PANEL METER
N30U TYPE
USER’S MANUAL

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Contents
1. APPLICATION AND METER DESIGN ........................................5
2. METER SET..................................................................................6
3. BASIC REQUIREMENTS, OPERATIONAL SAFETY .................7
4. INSTALLATION............................................................................8
5. SERVICE ....................................................................................11
6. RS-485 INTERFACE ..................................................................28
7. UPDATING OF SOFTWARE......................................................42
8. ERROR CODES .........................................................................44
9. TECHNICAL DATA ....................................................................45
10. ORDER CODES .........................................................................48
11. MAINTENANCE AND GUARANTEE.........................................50
User’s manual for meters with firmware version 2.00

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1. APPLICATION AND METER DESIGN
The N30U meter is a programmable digital panel meter destined for
measurements of signals originating from standard sensors destined
for temperature measurements and for the measurement of analog
standard signals applied in automation. Additionally, the meter enables
the indication of the current time. The readout field is a LED display,
which allows the exposition of results in colours: red, green and orange.
The measured input signal can be arbitrary converted by means of a
21-point individual characteristic.
Features of the N30U meter:
ldisplay colour individually programmed in three intervals,
lprogrammable thresholds of displayed overflows,
l2 NOC relay alarms operating in 6 modes,
l2 switched relay alarms with a switching contact operating
in 6 modes (option),
lsignaling of measuring range overflow,
lautomatic setting of the decimal point,
lprogramming of alarm and analog outputs with the reaction on the
selected input quantity (main or auxiliary input),
lreal-time clock with the function of the clock supply support in case
of the meter supply decay,
lprogrammed averaging time – function of walking window with the
averaging time up to 1 hour,
lmonitoring of set parameter values,
llocking of introduced parameters by means of a password,
lrecount of the measured quantity on the base of the 21-point
individual characteristic,
lservice of the interface with MODBUS protocol in the
RTU mode (option),
lconversion of the measured value into a standard – programmable
current or voltage signal (option),
lhighlight of any measuring unit acc. to the order,

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2. METER SET
The set is composed of:
- N30U meter........................................................................1 pc
- User’s manual ....................................................................1 pc
- Guarantee card..................................................................1 pc
- Set of clamps to fix the meter in the panel.........................4 pcs
- Set of labels with units .......................................................2 pcs
- Seal ....................................................................................1 pc
When unpacking the meter, please check whether the type and execu-
tion code on the data plate correspond to the order.
lsignaling of alarm operation – switching the alarm on causes the
highlight of the output number,
lgalvanic separation between connections: alarm, supply, input,
analog output, output of the auxiliary supply, RS-485 interface.
Protection grade from frontal side: IP65
Meter overall dimensions: 96 x 48 x 93 mm (with terminals).
The meter casing is made of plastic.
Fig. 1 View of the N30U Digital Meter

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3. BASIC REQUIREMENTS,
OPTIONAL SAFETY
In the safety service scope, the N30U meter meets the requirements of
the EN 61010-1 standard.
Mentioned below applied symbols mean:
- especially important , one must acquaint with this
information before connecting the meter. The non-
observance of notices marked by this symbol can
occasion injures of the personnel and a damage of the
instrument.
- One must take note of this when the instrument is
working inconsistently to the expectations. Possible
consequences if disregarded.
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.
· 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 meter is designed to be installed and exploited in
electromagnetic industrial environment conditions.
· 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 opera-
tor, 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.

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Fig. 3. Overall Dimensions
Fig. 2. Meter Fixing
4. INSTALLATION
The meter has separable strips with screw terminals, which enable the
connection of external wires of 1.5 mm2cross-section for input signals
and 2.5 mm2for other signals.
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 is adapted to be mounted in a panel. The meter must be
introduced from the panel front with disconnected supply voltage. Be-
fore 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.2).

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4.1. Lead-out of Signals
Signals led out on the meter connectors are presented on the fig. 4.
Circuits of successive groups of signals are separated between them.
Fig. 4. Description of Signals on Connection Strips
· 0...10 V – input for the measurement ±10 V voltage,
· GND – mass for the 0...10 V input and 0...20 mA input,
· 0...20 mA – input for the measurement of ±20 mA current,
· 60 mV TC – input for the measurement of 60 mV voltage, or for the
connection of RTD sensors,
· R, PT – input for the resistance measurement or for the connection
of RTD sensors. The compensation wire has been marked by
a broken line,
· OC – open collector output of npn type– signaling of the measuring
range overflow.

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4.2. Examples of Connections
An example of the N30U meter connection to different signals is pre-
sented on the fig. 5.
Fig. 5. Ways of the meter Connection
For the connection of input signals in environments with a high noise
level, one must apply shielded wires.

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5. SERVICE
5.1. Display Description
Fig. 6. Description of the Meter Frontal Plate
5.2. Messages after Switching the Supply on
After switching the supply on, the meter displays the meter name N30U
and next the program version in the „r x.xx” shape – where x.xx is the
number of the current program version or the number of a custom-made
execution. Next, the meter carries out measurements and displays the
value of the input signal. The meter sets up automatically the decimal
point position when displaying the value. The format (number of places
after the decimal point) can be limited by the user.

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5.3. Functions of Buttons
- Acceptation button:
Þentry in programming mode (hold down ca 3 seconds)
Þmoving through the menu – choice of level,
Þentry in the mode changing the parameter value,
Þacceptation of the changed parameter value,
Þstop the measurement – when holding down the button, the result
is not updated. The measurement is still carried out.
- button increasing the value:
Þdisplay of maximal value, The pressure of the button causes the
display of the maximal value during ca 3 seconds.
Þentry in the level of the parameter group,
Þmoving through the chosen level,
Þchange of the chosen parameter value – increasing the value.
- Button to change the digit:
Þdisplay of minimal value, The pressure of the button causes the
display of the maximal value during ca 3 seconds.
Þentry in the level of parameter group,
Þmoving through the chosen level,
Þchange of chosen parameter value – shift on the next digit,
- resignation button:
Þentry in the menu monitoring the meter parameters (by holding
down ca 3 seconds),
Þexit from the menu monitoring meter parameters,
Þresignation of the parameter change,
Þabsolute exit from the programming mode (by holding down
ca 3 seconds).

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The pressure of the button combination and holding
them down ca 3 seconds, causes the reset of alarm signaling. This
operation acts only when the support function is switched on.
The pressure of the button combination causes the era-
sing of the minimal value.
The pressure of the button combination causes the era-
sing of the maximal value.
The pressure and holding down the button ca 3 seconds cau-
ses the entry in the programming matrix. The programming matrix can
be protected by the safety code.
The pressure and holding down the button during 3 seconds
causes the entry in the menu monitoring meter parameters. One must
move through the monitoring menu by means of and
buttons. In this menu, all programmable meter parameters are only ava-
ilable for readout. In this mode, the menu Ser is not available. The exit
from the monitoring menu is carried out by means of the button.
In the monitoring menu, parameter symbols are displayed alternately
with their values.
The service algorithm of the meter is presented on the fig. 7.

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Fig. 7. Service Algorithm of the N30U Meter

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5.4. Programming
The pressure of the button and holding it down through ca 3
seconds causes the entry to the programming matrix. If the entry is pro-
tected by a password, then the safety code symbol SEC is displayed
alternately with the set value 0. The write of the correct code causes the
entry in the matrix, the write of an incorrect code causes the display of
the ErCod symbol. The matrix of transitions to the programming mode
is presented on the fig. 8. The choice of the level is made by means of
the button, however the entry and moving through the para-
meters of the chosen level is carried out by means of the and
buttons. Parameter symbols are displayed alternately with their
current values. In order to change the value of the chosen parameter,
one must use the button. For resignation from change, one must
use the button. In order to exit from the chosen level, one must
chose the ----- symbol and press the button. To exit from the
programming matrix, one must press the button during ca 1
second. Then, the symbol End appears for ca 3 seconds and the meter
transits to the display of the measured value. In case of leaving the
meter in the parameter programming mode, the automatic abandon of
the programming mode follows (parameter, and next the menu) after 30
seconds and the meter transits to display the measured value.
5.4.1. Value Change Way of the Selected Parameter
In order to increase the value of the selected parameter, one must
press the button. A single pressure of the button, causes the
increase of the value of 1. The increase of value when displaying the
digit 9 causes the set of 0 on this digit. The change of the digit follows
after pressing the button. In order to accept the set parameter,
one must hold down the button. Then, the write of the parameter
follows and the display of its symbol, alternately with the new value. The
pressure of the button during the change of the parameter value
will cause the resignation of the write.

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Fig. 8. Programming Matrix.

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Table 1
5.4.2. Changing Floating-Point Values
The change is carried out in two stages (the transition to the next stage
follows after pressing the button):
1) setting the value from the range -19999M...99999, similarly as for
integral values;
2) setting of the decimal point position (00000., 0000.0, 000.00,
00.000, 0.0000); the button shifts the decimal point to the
left, however the button shifts the decimal point to the right;
The pressure of the button during the change of the parameter
value will cause the resignation of the write.
5.4.3. Characteristic of Programmed Parameters
Programmed parameters and the range of their quantity changes are
presented in the table below.
InP 1
Parameter
symbol Description Range of changes
tYP1 Kind of the connected input
signal
Pt1 – Pt100
Pt5 – Pt500
Pt10 – Pt1000
rEZL – measurement of
resistance up to 400 W
rEZH – measurement of
resistance up to 4000 W
tE-J – J (Fe-CuNi)
tE-h – K (NiCr-NiAl)
tE-n – N (NiCrSi-NiSi)
tE-E – E (NiCr-CuNi)
tE-r – R (PtRh13-Pt)
tE-S – S (PtRh10-Pt)
0_10U – voltage measurement,
range 10 V.
0_20A – current measurement,
range 20mA
0_60n – voltage measurement,
range 60mV.
HOUr – current time.

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Table 2
Ind
Parameter
symbol Description Range of changes
IndCp
Number of points of the individual
characteristic. For a value lower than 2,
the individual characteristic is switched
off. The number of segments is the
number of points decreased of one.
The individual characteristic is not taken
into consideration in the CountH and
HoUr modes.
1...21
Hn The point value for which we will expect
Yn (n-point number) -19999...99999
Yn Expected value for Xn. -19999...99999
cd. Table 1
Con
Choice of the measured value
compensation. Concerns only the
work in the mode of temperature
or resistance measurement. The
wire linking the meter with the
sensor defines the resistance
for RTD sensors, however for
thermocouples, the compensa-
tion is defined by the cold junc-
tion temperature. The choice of a
value beyond the range causes
the switching of the automatic
compensation on.
-19999...99999
Introduction of values:
0..20 W- causes the switching
of the manual compensation on
for the resistance or tempera-
ture measurement by means of
RTD (resistance thermometers).
0...60oC– causes the switching
of the manual compensation on
for thermocouples.
Cnt1
The measurement time is
expressed in seconds. The result
on the display presents the mean
value counted in the Cnt1 period.
This parameter is not taken into
consideration during the
measurement in counter modes.
1...3600

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dISP
Parameter
symbol Description Range of changes
d_P
Minimal position of the decimal point
When displaying the measured value
- display format. This parameter is not
taken into consideration during tCountH
and HoUr modes.
0.0000 – 0
00.000 – 1
000.00 – 2
0000.0 – 3
00000 – 4
CoLdo Display colour, when the displayed
value is ower than CoLLo
rEd – red
grEEn – green
orAnG - orange
CoLbE
Display colour, when the displayed
value is higher than CoLLo and lower
than CoLHi
CoLuP Display colour when the displayed value
is higher than CoLHi
CoLLo Lower threshold of colour change -19999..99999
CoLHi Upper threshold of colour change -19999..99999
ovrLo
Lower threshold of display narrowing
Values below the declared threshold
are signaled on the display by the
-----
symbol.
-19999..99999
ovrHi
Upper threshold of display narrowing
Values above the declared threshold
are signaled on the display by the
-----
symbol.
-19999..99999
Table 3
Table 4
ALr1, ALr2, ALr3, ALr4
Parameter
symbol Description Range of changes
P_A1
P_A2
P_A3
P_A4
Input quantity, steering the alarm.
InP1 – Main input (indicated
value).
HoUr – Real-time clock.

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tYP1
tYP2
tYP3
tYP4
Alarm type. Fig. 11 presents the
graphical imaging of alarm types
n-on – normal (transition from
0 na 1),
n-oFF – normal (transition
from 1 na 0),
on - switched on,
oFF – switched off,
H-on – manually switched
on; till the change time of the
alarm type, the alarm output
remains switched on
H-oFF – manually switched
off; till the change time of
the alarm type the output
alarm remains switched off
for good.
PrL1
PrL2
PrL3
PrL4
Lower alarm threshold. -19999...99999
PrH1
PrH2
PrH3
PrH4
Upper alarm threshold. -19999...99999
dLY1
dLY2
dLY3
dLY4
Delay of alarm switching. 0...32400
cd. Table 4