Lumel N32U User manual

DIGITAL PANEL METER
N32U
USER’S MANUAL

N32U User's manual 2
Contents
1 Application.......................................................................................................................................3
2 Meter set...........................................................................................................................................5
3 Basic requirements, operational safety.............................................................................................5
4 nstallation........................................................................................................................................5
4.1 nstallation method...................................................................................................................5
4.2 External connection diagram....................................................................................................7
4.3 Examples of connecting the external transducers ..................................................................10
5 Service............................................................................................................................................11
5.1 Description of the frontal plate...............................................................................................11
5.2 Buttons' functions...................................................................................................................13
5.3 Programming meter parameters..............................................................................................14
5.3.1 How to change quantity of a selected parameter............................................................16
5.3.2 Programmable meter parameters, default parameters.....................................................17
5.4 Meter functions.......................................................................................................................21
5.4.1 Measurement...................................................................................................................21
5.4.1.1 Averaging the measuring quantity...........................................................................22
5.4.1.2 Minimum and maximum measuring values............................................................23
5.4.1.3 Mathematical functions...........................................................................................23
5.4.1.4 ndividual characteristic..........................................................................................23
5.4.2 Analog output..................................................................................................................25
5.4.3 Alarm outputs..................................................................................................................26
5.5 RS-485 interface.....................................................................................................................27
5.5.1 Connection......................................................................................................................27
5.5.2 Description of the MODBUS protocol implementation.................................................28
5.5.3 mplemented functions of MODBUS protocol...............................................................28
5.5.4 Map of the registers.........................................................................................................29
5.5.4.1 Registers 4000 – 4054.............................................................................................29
5.5.4.2 Registers 4200 – 4233.............................................................................................34
5.5.4.3 Registers 7500 – 7515 and 7000 – 7031.................................................................35
5.5.4.4 Registers 7600 – 7677 and 7200 – 7355.................................................................35
6 Error codes......................................................................................................................................38
7 Technical data.................................................................................................................................39
8 Ordering code.................................................................................................................................42

N32U User's manual 3
1 Application
The N32U meter is a digital panel meter adapted to be fixed to the panel. The N32U
meters are designed to measure standard analog signals used in automation and enable
the measurement of standardized voltage and current signals, the signals from RTD and
thermocouple sensors. The measuring value can be freely converted into the required
value using the mathematical functions or an individual characteristic.
Additionally, the meter supports the programmable alarms with the delay activation and
deactivation function as well as a memory of the alarm event. The functionality of the
meter is complemented by a programmable analog output - RS-485 interface.
The user interface consists four buttons and the high contrast L D display with backlight.
Thanks to the two-line display, it is possible to set the selected unit, display simultaneously
the measuring value and the current time, as well as a clear and user friendly menu with
simultaneously visible the parameter name and its value.
Features of the N32 meter:
•Universal measuring input including the standard signals used in automation.
•Measuring sensor failure indication.
•High contrast L D display with built-in backlight.
•Two-line display.
•Programmable unit of measuring value.
•Possibility to simultaneously display a measuring value and time or not converted
quantity.
•Programmable displayed precision with automatic setting of a decimal point.
•Possibility to program the measuring range (narrowing).
•Additional measurement of minimum and maximum values during the moving
window, with the possibility of programming one of these values to be displayed as
the basic one.
•Programmable alarms with the functions of programmable delays of alarm
activation and deactivation, triggered by a specific controlling value. Up to 4 relays
including up to 3 relays with a switching contact. Possibility to configure each of the
alarms to work in a selected mode and to react to any measuring quantity including
the current time.
•Possibility to control the alarm outputs (relay) via the RS-485 interface.
•Programmable standard analog outputs enabling the retransmission of a measuring
quantity or a selected parameter. Freely programmable output type and conversion

N32U User's manual 4
range.
•Built-in by default RS-485 interface with MODBUS RTU protocol support.
•Built-in real-time clock with a built-in automatic change of DST and inversely. The
clock can be a parameter which controls the alarms and the value of the analog
output signal.
•Possibility to password protect the settings against unauthorized modification.
•Monitoring of set parameters.
•Measuring quantity conversion using the mathematical functions.
•Measuring quantity conversion using the 32 points individual characteristic.
•Programmed averaging time - averaging algorithm in a specified time using
standard averaging (determining the number of measurements to be averaged) and
averaging based on the moving window algorithm with a given averaging time.
•Signaling of alarm operation by highlighting the number of the active alarm.
•Registration of minimum and maximum measuring value.
•Galvanic separation of the connections: alarm, measurement, analog outputs,
auxiliary supply outputs, RS-485 interface and supplying input.
•Protection degree from the front IP65.
•Meter overall dimensions 96 x 48 x 100 (with the terminals).
•The casing is made of a self-extinguishing plastics.
•Wide range of supply voltages.
The view of the N32U meter is shown in Fig. 1.
Fig. 1: View of the N32U meter.

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2 Meter set
The meter set includes:
•Meter N32U – 1 pc
•User's manual – 1 pc
•lamps to fix in the panel – 4 pcs
•Seal – 1 pc
3 Basic requirements, operational safety
In terms of a user safety, the N32U meter meets the requirements of the EN61010-1
standard for the devices intended for use in facilities compliant with the third category of
installations.
Comments concerning safety
•Assembly and installation of the electrical connections should conducted only by a
person authorised and certificated to perform assembly of electric devices.
•Always check the connections before turning the meter on.
•The meter is designed to installation and usage in the industrial electromagnetic
environment.
•A switch or a circuit-breaker should be installed in the building or facility. It should
be located near the device, easily accessible by the operator, and suitably marked.
•Removal of the meter electronics during the warranty period voids the warranty.
4 Installation
4.1 Installation method
The N32U meters are designed to be mounted in a panel. Prior to installation a 92 +0.6 x
45+0.6 mm slot must be made in the panel. The maximum thickness of the panel material
cannot exceed 6 mm. The meter should be mounted from the front of the panel with
disconnected meter connection strips.
Before inserting the meter into the panel check the correct position of the meter seal and
make sure that the edges of the panel are not sharp what could damage the seal. After
inserting the meter into the slot, mount it with the mounting brackets provided in the meter
set (Fig. 2).

N32U User's manual 6
Electrical connections of the meter should be made with the wires with the cross-section
up to 2.5 mm2. Detachable sockets with the plugs of 5.08 mm pitch can be used for the
connections.
The external dimensions of the meter are shown in Fig. 3.
Fig. 2: Meter fixing.
Fig. 3: Meter overall dimensions.

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4.2 E ternal connection diagram
The N32U meter has two detachable terminal strips to connect the wires of a cross-section
up to 2.5 mm2. The view of the meter from the connectors' side is shown in Fig. 5. The
upper terminal strip is optional and depends on the accessories of the meter.
The circuits of successive groups of the terminals are separated from each other, as
shown in Fig. 4.
Note: Unused terminals of the terminal strips (NC) must not be connected to any signals.

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Detailed description of the signals is shown in the table below, and the connection of the
measuring signals is shown in Fig. 6.
Terminal Function Description
1, 2, 3, 4,
5
Measuring inputs Measuring inputs for connecting sensors, transducers or
output signals from the other devices. Examples of the
connections are shown in Fig. 6.
6, 7 Supply output Auxiliary supplying output (24 V) for supplying the
transducers, e.g. head-mount transducers supplied by a
current loop. Maximum current carrying capacity of the
output is 30 mA.
9, 10, 11 RS-485 RS-485 interface signals
12, 13 Alarm 1 Alarm output 1, which is NO relay contact.
15, 16 Power supply Meter power supply connection. Range of supply voltages
Fig. 5: ignals on the terminal strips.

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supported by the meter depends on the ordering code. It
is required to check if the rated range of the meter
corresponds to the installation to which the meter will be
connected before installing the meter.
20...28 Alarms 2, 3, 4
(optional)
The alarm outputs 2, 3 and 4 use a relay with a switching
contact.
30...34 Analog output Analog output. The output must be properly connected
according to the type of output selected in the
configuration (voltage or current): the terminals 30 and 31
for the current output or the terminals 32 and 33 for the
voltage output. It is not possible to use the voltage and
current outputs at the same time - the correct value in
accordance with the configuration, will be available only
for the selected output type.
35, 36 Binary output Open collector binary output for future applications. The
output should be left unconnected.
8, 14, 29 N Unused terminals. Should be left unconnected.
The connection of the basic measured signals is shown below. The inputs not used in the
configuration should be left unconnected.

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Standard signals 0...10 V
(Range -13…13 V)
Standard signals 0/4...20 mA
(Range -24…24 mA).
Thermocouples, thermocouple sensors
(thermocouple)
Standard shunts: 60 mV, 150 mV,
300 mV
(Measuring range respectively:
-75...75 mV, -155...155 mV,
-310...310 mV).
RTD sensors or resistor in 3-wire
system.
RTD sensors or resistor in 2-wire
system.
4.3 E amples of connecting the e ternal transducers
onnections of the head-mount transducers when the transducers are supplied directly
from the N32 meter are shown below. In the case of the transducers with a voltage output,
the maximum current carrying capacity of the auxiliary supply output is 30 mA.