Lumel ND20CT User manual

ND20CT-09AUser's manual
1

ND20CT-09AUser's manual
2
Contents
1 APPLICATION.................................................................................................................................... 3
2 METER SET....................................................................................................................................... 3
3 BASIC REQUIREMENTS, OPERATIONAL SAFETY.......................................................................... 3
4 INSTALLATION .................................................................................................................................. 4
5 METER DESCRIPTION...................................................................................................................... 5
5.1 Current inputs ............................................................................................................................. 5
5.2 Voltage inputs ............................................................................................................................. 5
5.3 Connection diagrams.................................................................................................................. 5
6 ND20CT PROGRAMMING................................................................................................................. 9
6.1 Frontal panel............................................................................................................................... 9
6.2 Messages after Switching the Supply on....................................................................................10
6.3 Monitoring of Parameters...........................................................................................................10
6.4 Operating Modes: ......................................................................................................................13
6.5 Parameter Settings ....................................................................................................................14
6.5.1 Setting of Meter Parameters.............................................................................................. 16
6.5.2 Setting of Output Parameters ............................................................................................ 17
6.5.3 Setting of Alarm Parameters.............................................................................................. 18
6.5.4 Setting displayed quantities............................................................................................... 22
7 UPDATING SOFTWARE...................................................................................................................23
8 RS-485 INTERFACE .........................................................................................................................24
8.1 MAP OF ND20CT REGISTERS.................................................................................................26
9 ERROR CODES................................................................................................................................34
10 TECHNICAL DATA ..........................................................................................................................35
11 ORDERING CODES........................................................................................................................38
12 ACCESSORIES...............................................................................................................................38
12.1 LJ series current transformers with RJ12 connector.................................................................38
12.2 Current transformers of L3xx series for screw terminal connection ..........................................40
12.3 Splitter......................................................................................................................................42

ND20CT-09AUser's manual
3
1 APPLICATION
ND20CT meter is a digital programmable panel meter designed to measure parameters of single-
phase 2-wire and three-phase 3 and 4-wire power networks, working with external current
transformers:
- 3-phase with RJ12 connector and 100 mA output, LJ series integrated in one housing,
- 1 phase with RJ11 connector and 100 mA LJ output, via splitter,
- 3-phase with wires for screw terminals and 250 mA output, L3xx series integrated in one housing,
The use of RJ12 connectors makes the connection of the current transformers fast, easy, reliable and
eliminates faulty connections.
Measured values are shown on a dedicated LCD display. The meter enables controlling and optimizing
the operation of power electronics devices, systems and industrial installations.
It provides measurement of: RMS voltage and current, active, reactive and apparent power, active and
reactive energy, power factor, frequency, 15-, 30-, 60-minute mean active power, THD measurement.
Additionally, the current value in the neutral wire is calculated. Voltages and currents are multiplied by
given voltage and current ratios of measuring transformers Indications of power and energy take into
consideration values of programmed ratios. The value of each measured quantity can be transmitted to
the master system through the RS-485 interface. The relay output signals the overflow of the chosen
quantity, and the impulse output can be used for the consumption check of 3-phase active and reactive
energy. The meter has the detection and signaling of an incorrect phase sequence.
The meter has a galvanic separation between respective blocks:
- power supply,
- RS-485 output,
- impulse output,
- analog output,
- voltage and current inputs.
The voltage and current inputs are not separated from each other - they are on a common potential.
2 METER SET
Complete set of the Analyzer includes:
- ND20CT meter 1 pc.
- User’s Manual: 1 pc.
- warranty card 1 pc
- seal 1 pc
- holders to fix the meter in the panel 4 pcs.
3 BASIC REQUIREMENTS, OPERATIONAL SAFETY
In terms of operational safety, the meter meets the requirements of EN 61010-1.
Safety instructions:
The meter installation and connection should be made by qualified personnel. All available
protection requirements must by taken into consideration.
Before turning on the meter verify the connections.
Prior to removing the meter housing, always turn the supply off and disconnect the measurement
circuits.
Before removing the connection cable from the RJ12 connector, make sure that the circuit is
disconnected because hazardous voltage can occur on the plug of the connecting cable.
Removal of the meter housing during the warranty period voids the warranty.
The meter meets the requirements for electromagnetic compatibility in industrial environment.
A switch or a circuit-breaker should be installed in the building or facility. It should be located near
the device, easily accessible to the operator, and suitably marked.

ND20CT-09AUser's manual
4
4 INSTALLATION
The synchronizing unit is adapted to be fixed to the panel by means of holders, according to fig. 1.
The housing of the meter is made of plastic.
Housing dimensions are 96 x 96 x 77 mm. Outside the meter there are screw terminal strips that allow
connection of external wires with a cross-section up to 2.5 mm2.
A cut-out of 92.5+0.6 x 92.5+0.6 mm must be made in the panel. The thickness of the material from
which the panel is made must not exceed 6 mm. The meter should be inserted from the front of the
panel with the power supply disconnected. After inserting into the hole, fix the meter by means of
holders
1
2
Fig. 1: Meter fitting
Fig. 2: Meter overall dimensions

ND20CT-09AUser's manual
5
5 METER DESCRIPTION
5.1 Current inputs
The meter is adjusted to work with external measuring current transformers with 100 mA outputs (RJ12
connector) or 250 mA outputs (screw terminals). Displayed values of currents and derivative quantities
are automatically converted according to the introduced external current transformer ratio.
5.2 Voltage inputs
Quantities on voltage inputs are automatically converted acc. to the introduced ratio of the external
voltage transformer Voltage inputs are defined in the order as 3 x 57.7/100 V or 3 x 230/400 V.
5.3 Connection diagrams
a)
CT Input
LN
211 8 5
L
N
47 19
1819202123 2224252627
+
WYimp
13141517 16
AL1
Zasilanie +
WYA1
BA GNDI
RS485
12
ND20CT
supply
OUpulse
OUA1

ND20CT-09AUser's manual
6
b)
L1L2L3N
211 8 5
L1
L2
L3
N
47 19
1819202123 2224252627
+
WYimp
13141517 16
AL1
Zasilanie +
WYA1
BA GNDI
RS485
12
ND20CT
1S1
1S2
2S1
2S2
3S1
3S2
A
A
CT Input
supply
OUpulse
OUA1

ND20CT-09AUser's manual
7
c)
CT Input
L1L2L3N
211 8 5
L1
L2
L3
N
47 19
1819202123 2224252627
+
WYimp
13141517 16
AL1
Zasilanie +
WYA1
BA GNDI
RS485
12
ND20CT
CT3
CT2
CT1
CT OUT
Splitter ND20CT-303
supply
OUpulse
OUA1

ND20CT-09AUser's manual
8
d)
CT Input
L1
L2
L3N
211 8 5
L1
L2
L3
N
47 19
1819202123 2224252627
+
WYimp
13141517 16
AL1
Zasilanie +
WYA1
BA GNDI
RS485
12
ND20CT
1S1
2S13S1
COM
Fig. 3: Examples of meter connections:
a) with a 1-phase current transformer with RJ12 output,
b) with a 3-phase current transformer with RJ12 output,
c) with 3 1-phase current transformers connected via a splitter,
d) with a 3-phase current transformer with an output for screw terminals.
supply
OUpulse
OUA1

ND20CT-09AUser's manual
9
6 ND20CT PROGRAMMING
6.1 Frontal panel
Fig. 4: Frontal panel
Description of the frontal panel:
1 –abandon push-button –ESC
2 –push-button to displace to the left
3 –push-button to decrease the value
4 –push-button to increase the value
5 –push-button to displace to the right
6 –acceptance push-button ENTER
7 –symbol of displayed value of averaged active
power
8 –display field of mean values, frequency, time, power
guard
9 –display field of basic quantities, energy, THD
10 –symbols indicating the display of power factor,
power tangent and THD (row 4)
11 –units of displayed values
12 –symbols of digital data transmission
13 –multipliers of basic values
14 –symbols of alarm switching on /
occurrence
15 –symbols of THD value display
16 –symbols of energy flow
17 –symbols of min / max quantities
18 –symbols of quantity affiliation to respective
phase
19 –symbols of power, energy character
20 –symbol of 3-phase quantity display

ND20CT-09AUser's manual
10
6.2 Messages after Switching the Supply on
After switching the supply on, the meter performs the display test and displays the ND20CT meter
name, version, serial number and the current program version.
Fig. 5: Messages after starting the meter
where: oooooooo is the serial number, r n.nn is the number of the current program version or the
number of the custom-made version, bnnn is the bootloader version number.
Caution! If the display shows the message Err Cal or Err EE, it is necessary to contact
the service.
6.3 Monitoring of Parameters
In the measuring mode, quantities are displayed acc. to settled tables Pushing the push-button
(left) or push-button (right) causes the transition between displayed quantities. Pushing the
push-button (Enter) causes the transition between mean and additional displayed values. Pushing the
push-button (down) causes the monitoring of the minimum value, however the pressure of the
push-button (up) causes the monitoring of the maximum value. Pushing the (ESC) push-
button during the monitoring of these values, erases minimum or maximum values respectively.
Through the RS-485 interface one can set up the values, that would be visualized.
The error display is described in the chapter 8.
When displaying the reactive power, a marker indicating the load character is displayed, capacitive ( )
or inductive ( ).
Displayed quantities in the field 9 (fig. 5.) for 3-phase 4-wire measurement mode 3Ph/4W
and single-phase 1Ph/2W are presented in the table 1a and 1b.
Table 1a
Displayed symbols
L1,V
L2,V
L3,V
L1-2,V
L2-3,V
L3-1,V
L1,A
L2,A
L3,A
L1,W
L2,W
L3,W
L1,var
L2,var
L3,var
L1,VA
L2,VA
L3,VA
L1,PF
L2,PF
L3,PF
L1,tg
L2,tg
L3,tg
kWh
Displayed
values
row 1
U1
U12 1
I1
P1
Q1
S1
PF1
tg1
Imported
active
energy
2
row 2
U2 1
U231
I21
P21
Q21
S21
PF21
tg21
row 3
U31
U311
I31
P31
Q31
S31
PF31
tg31
Displaying
option
al
optiona
l
option
al
option
al
optional
option
al
option
al
option
al
optional