Lumel N27P User manual

1
RAIL MOUNTED NETWORK METER
N27P
USER’S MANUAL

2

3
Contents
1. APPLICATION.................................................................................. 5
2. METER SET..................................................................................... 6
3. BASIC REQUIREMENTS, SAFETY OF USE.................................. 7
4. INSTALLATION................................................................................ 8
4.1 Mounting method...................................................................... 8
4.2 Connections............................................................................ 10
5. OPERATION ...................................................................................11
5.1 Description of front panel.......................................................11
5.2 Messages after switching the power supply on ...................11
6. MENU............................................................................................. 12
6.1 Display..................................................................................... 12
6.2 Menu structure........................................................................ 15
6.3 Programming the inputs ........................................................ 18
6.4 Reseting counters .................................................................. 20
6.5 Display settings ...................................................................... 21
6.6 Programming the alarms ....................................................... 22
6.7 Programming the outputs...................................................... 29
6.8 Service settings ...................................................................... 31
7. SERIAL INTERFACES................................................................... 33
7.1 RS485 – list of parameters..................................................... 33
7.2 USB – list of parameters ........................................................ 34
7.3 Map of N27P meter registers ................................................. 34
8. ERROR CODES............................................................................. 49

4
9. FIRMWARE UPDATING ................................................................ 50
9.1 Software L1 level update........................................................ 50
9.2 Software L2 level update........................................................ 53
10. TECHICAL SPECIFICATION....................................................... 54
11. ORDERING CODE ....................................................................... 59

5
1. APPLICATION
The N27P is a programmable digital device used to
measure the parameters of single-phase electrical networks.
The meter measures and calculates the following values:
• phase voltage
• 10 minutes’ mean voltage
• current
• active power
• reactive power
• apparent power
• active power factor
• ratio of reactive/active power
• mean active power
• phase shift
• input of active energy
• output of active energy
• input of reactive energy
• output of reactive energy
• apparent energy
• frequency
• 10 seconds’ mean frequency
• time
• maximum and minimum values of:
- phase-to-neutral voltage;
- current;
- active power;
- reactive power;
- apparent power;
- active power factor;
-tangentφ;
- frequency;
- average active power;

6
2. METER SET
The meter set comprises:
- N27P meter ............................. 1 pc
- User Manual............................ 1 pc
- Warranty Card ......................... 1 pc
- CD ........................................... 1 pc
Accessories:
The following accessories can be ordered for the N27P meter:
- USB A/miniUSB cable – 1 m, black; order code: 1126-271-028
It is possible to enter transformer ratio of used external current
or voltage transformers which will be accounted for in the mea-
surementandcalculationofallvalues.Allvaluesandcongu-
ration parameters are accessible through the RS485 and USB
interfaces.The meter output signals are galvanically isolated
from the input and power supply signals.
Figure 1. Meter for direct measurements (left)
Meter for indirect measurements (right)

7
3. BASIC REQUIREMENTS, SAFETY OF USE
The symbols used in the manual have the following meaning:
Warning!
Potentially hazardous situations. Read
before connecting the device! Failure
to observe recommendations marked with
this symbol can result in heavy personal
injuries and device damage
Caution!
Generally useful notes. Read them to make
the device use easier. Pay attention to these
notes when the device is not working correctly.
Possible consequences if the information
is disregarded!
In terms of safety of use the meter conforms
to EN 61010-1.
Safety notes:
• Electrical connections should be made by a person with
required licences to install electrical devices.
• Check the correctness of connections before turning
the meter on.
• Removal of the meter cover during the warranty period makes
the warranty null and void.

8
4. INSTALLATION
4.1. Mounting method
The N27P meter can be installed in modular distribu-
tion boards on the 35 mm rail bracket. The meter enclosure is
made of plastic and its dimensions are 53 x 110 x 60.5 mm.
On the outside of the meter there are screw terminal blo-
cks to connect the measurement signals using the leads
up to 5.3 mm2in cross section (1 A / 5 A), and up to 16 mm2
(32 A / 63 A) and the remaining signals using the leads
up to 2.5 mm2. The meter dimensions are shown in Figure 2.
• The meter is intended for installation and use in industrial
electromagnetic environments.
• The building electrical installation should have a switch
or a circuit breaker located near the device, easily
accessible and properly marked.

9
Figure 2. Meter dimensions
The meters shall not be installed on the rail
in direct contact with other heat emitting devices
(e.g. successive N27P meters). Leave the minimum
5-mm space between devices to enable radiation
of heat from the enclosure to the ambient air.
Otherwise, the temperature in direct vicinity
of the meter may exceed the rated operating
temperature.

10
4.2 Connections
The meter connections are shown in Figure 3.
Figure 3. N27P wiring diagrams
63 A
123456
ab
AB
Range 1 A / 5 A
Range 32 A / 63 A