ST N30H User manual

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DIGITAL PANEL METER
N30H 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 ..................................................................27
7. SOFTWARE UPDATE................................................................27
8. ERROR CODES .........................................................................41
9. TECHNICAL DATA ....................................................................42
10. ORDER CODES .........................................................................44
11. MAINTENANCE AND GUARANTEE.........................................46

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1. APPLICATION AND METER DESIGN
The N30H meter is a programmable digital panel meter destined for
the measurement of d.c. voltage or d.c. current. 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 N30H 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 the measuring range overflow,
lautomatic setting of the decimal point,
lprogramming of alarm and analog outputs with the reaction
on the chosen 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,
linterlocking of introduced parameters by means of a password,
lrecount of the measured quantity on the base of a 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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Fig. 1. View of the N30H meter
lsignaling of alarm operation – switching the alarm on causes
the highlight of the output number,
lgalvanic separation between connectors: alarm, supply, input,
analog output connections and RS-485 interface.
Protection degree from frontal side: IP65
Meter overall dimensions: 96 x 48 x 93 mm (with terminals).
The meter casing is made of plastics.
2. METER SET
The set is composed of:
- N30H meter..........................................................1 pc
- User’s manual ......................................................1 pc
- Guarantee card....................................................1 pc
- Clamps to fix in the panel ....................................4 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.

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3. BASIC REQUIREMENTS, OPERATIONAL
SAFETY
In the safety service scope, the N30H meter meets the requirements of
the EN 61010-1 standard.
Observations concerning the operational safety
lAll operations concerning transport, installation, and commissioning
as well as maintenance, must be carried out by qualified, skilled per-
sonnel, and national regulations for the prevention of accidents must
be observed.
lThe programming of N30H meter parameters must be carried out
after disconnecting measuring circuits
lBefore switching the meter on, one must check the correctness of
connections.
lDo not connect the meter to the network through an autotransformer.
lBefore removing the meter housing, one must switch the supply off
and disconnect measuring circuits.
lThe meter is designed to be installed and exploited in electromag-
netic industrial environment conditions.
lNon-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.
lWhen 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 operator, and
suitably marked as an element switching the meter off.

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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 2.5 mm2cross-section. Strips of input
signals are protected against any accidental disconnection by means
of a screw joint.
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. Signals Leads
Signals led out on the meter connectors are presented on the fig. 4.
All input signals are separated between them from remaining circuits.
Analog outputs are not separated between them. One don’t have to
take simultaneously advantage of voltage and current measure-
ments, since measuring circuits of voltage and current are not galva-
nically isolated.
Fig. 4. Description of signals on connection strips
· 1 A, 5 A – terminals for the current measurement on the 1 A
or 5 A range.
· 100 V, 500 V – terminals for the voltage measurement on the 100 V
or 500 V range.
· OC –output of open collector type with an npn output transistor.
The output is turned on in case of a measuring range overflow.

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4.2. Examples of Connections
An example of the N30H meter connection for current measurement is
presented on the fig. 5.
However, an example of the meter connection in the configuration for
voltage measurement is presented on the fig. 6.
Fig. 5. Meter connection in the configuration for current measurement
Fig. 6. Meter connection in the configuration for voltage measurement