ST N30U Manuale utente
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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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