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:
l display colour individually programmed in three intervals,
l programmable thresholds of displayed overflows,
l 2 NOC relay alarms operating in 6 modes,
l 2 switched relay alarms with a switching contact operating
in 6 modes (option),
l signaling of measuring range overflow,
l automatic setting of the decimal point,
l programming of alarm and analog outputs with the reaction on the
selected input quantity (main or auxiliary input),
l real-time clock with the function of the clock supply support in case
of the meter supply decay,
l programmed averaging time – function of walking window with the
averaging time up to 1 hour,
l monitoring of set parameter values,
l locking of introduced parameters by means of a password,
l recount of the measured quantity on the base of the 21-point
individual characteristic,
l service of the interface with MODBUS protocol in the
RTU mode (option),
l conversion of the measured value into a standard – programmable
current or voltage signal (option),
l highlight 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 execution code on the data plate correspond to the order.
l signaling of alarm operation – switching the alarm on causes the
highlight of the output number,
l galvanic 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 mm2 cross-section for input signals
and 2.5 mm2 for 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. 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.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 presented 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:
Þ entry in programming mode (hold down ca 3 seconds)
Þ moving through the menu – choice of level,
Þ entry in the mode changing the parameter value,
Þ acceptation of the changed parameter value,
Þ stop the measurement – when holding down the button, the result
is not updated. The measurement is still carried out.
- button increasing the value:
Þ display of maximal value, The pressure of the button causes the
display of the maximal value during ca 3 seconds.
Þ entry in the level of the parameter group,
Þ moving through the chosen level,
Þ change of the chosen parameter value – increasing the value.
- Button to change the digit:
Þ display of minimal value, The pressure of the button causes the
display of the maximal value during ca 3 seconds.
Þ entry in the level of parameter group,
Þ moving through the chosen level,
Þ change of chosen parameter value – shift on the next digit,
- resignation button:
Þ entry in the menu monitoring the meter parameters (by holding
down ca 3 seconds),
Þ exit from the menu monitoring meter parameters,
Þ resignation of the parameter change,
Þ absolute 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 protected 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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