Lumel ND20 network parameter meter User’s Manual
Below you will find brief information for network parameter meter ND20. The ND20 is a digital programmable panel meter designed for measuring 3-phase 4-wire network parameters in balanced and unbalanced systems. It simultaneously displays measured quantities and digitally transmits their values. The meter enables the control and optimization of power electronics devices, systems, and industrial installation operations. It measures RMS values of voltage and current, active, reactive, and apparent power, active and reactive energy, power factors, frequency, mean active power (15, 30, 60 minutes), power profile archive, THD, and harmonic measurements. The ND20 features a galvanic separation between supply, measuring inputs, voltage and current inputs, analog output, RS-485 output, and impulse output.
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METER OF NETWORK
PARAMETERS
ND20 TYPE
USER’S MANUAL
CONTENTS
1. APPLICATION ............................................................................................................... 3
3. BASIC REQUIREMENTS AND OPERATIONAL SAFETY ........................................... 3
4. INSTALLATION ............................................................................................................. 4
9. TECHNICAL DATA ..................................................................................................... 30
10. ORDERING CODES ................................................................................................... 33
1. APPLICATION
The N20D meter is a digital programmable panel meter destined for the measurement of 3-phase 4-wire network parameters in balanced and unbalanced systems with the simultaneous display of measured quantities and digital transmission of their values. The meter enables the control and optimization of power electronics devices, systems and industrial installation operations
The meter ensures the measurement of: rms values of voltage and current, active, reactive and apparent power, active, reactive energy, power factors, frequency, 15,
30, 60 minutes’ mean active power, archive of power profile, THD and harmonic measurements. 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 additionally a continuous current output.
The meter has a galvanic separation between respective blocks:
- supply,
- measuring inputs,
- voltage and current inputs,
- analog output,
- RS-485 output,
- impulse output.
2. METER SET
The set of the ND20 meter is composed of:
1. ND20 meter 1 pc.
2. user’s manual 1 pc.
3. guarantee card 1 pc
4. seal 1 pc.
5. holders to fix the meter in the panel 4 pcs
3. BASIC REQUIREMENTS AND OPERATIONAL SAFETY
In the safety service scope, the ND20 meter meets to requirements of the
EN 61010 -1 standard.
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
3
regulations for the prevention of accidents must be observed.
▪ Before switching the meter on, one must check the correctness
of connection to the network.
▪ Before removing the meter housing, one must switch the supply off and
disconnect measuring circuits.
▪ The removal of the meter housing during the guarantee contract period may
cause its cancellation.
▪ The ND20 meter is destined to be installed and used in industrial
electromagnetic environment conditions.
▪ One must remember that in the building installation, a switch or a circuit-breaker
should be installed. This switch should be located near the device, easy accessible
by the operator, and suitably marked.
4. INSTALLATION
The ND20 meter is adapted to be fixed on a panel by means of holders. The fitting way is presented on the fig.1.
Housing overall dimensions: 96 x 96 x 77 mm.
At the rear side of the meter, there are screw terminal strips which enable the connection of external wires with a crosssection up to 2.5 mm².
One must prepare a 92.5
+0.6
x 92.5
+0.6 mm cut-out in the panel. The material thickness which the panel is made from should not exceed 15 mm. Insert the meter from the frontal panel side with the disconnected supply voltage. After the insertion into the hole, fix the meter by means of holders.
1
2
Fig. 1. Meter fitting
4
Fig. 2 Meter overall dimensions
5. METER DESCRIPTION
All current inputs are galvanically isolated (internal current transformers). The meter is adapted to co-operate with external measuring current transformers. Displayed current values and derivative quantities are automatically recoun in relation to the introduced external current transformer ratio. Current inputs are defined in the order as 1 A or 5 A.
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, 3 x 230/400 V.
5
Direct measurement in a 4-wire network.
Semi-indirect measurement in a 4-wire network.
6
Indirect measurement with the use of 3 current transformers and 2 or 3 voltage transformers in a
4-wire network.
Fig 4. Meter connection diagrams in a 4-wire network.
7
6. ND20 ProgramMING
17
16 15 14 13 12
18
19
20
1 2 3 4 5 6
9
8
7
Fig 5. 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, harmonics, date (rows 1, 2, 3)
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 harmonic value, THD 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
8
6.2. Messages after Switching the Supply on
After switching the supply on, the meter performs the display test and display the
ND20 meter name, rated current and voltage, the current program version, and next displays the measured values. where: n.nn is the number of the current program version or the number of the custom-made version.
Fig. 6. Message after starting the meter
Caution! If on displays the message Err Cal or Err EE appears, one must contact
the service shop.
6.3. Monitoring of Parameters
In the measuring mode, quantities are displayed acc. to settled tables.
The pressure of the push-button (left) or
push-button (right) causes the transition between displayed quantities. The pressure of the
push-button
(Enter) causes the transition between mean and additional displayed values. The pressure of 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.
The pressure of the (ESC) push-button during the monitoring of these values, erases suitably minimum or maximum values. During the operation in the measuring mode of all harmonics (ALL-table 3), instead of harmonic energy, harmonic percentage values are displayed.
Through
and
push-buttons, one can switch between successive harmonics. The harmonic no is alternately displayed with the value.
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 (
)
9
Displayed quantities in the field 9 (fig. 5.)
Table 1
Backlit symbols
L
L
1
,V
2
,V
L
3
,V row 1 U1 U12
Displayed
L
L
L
1-2
,V
2-3
,V
3-1,
V values
L
1
L
2
L
3
,A
,A
,A
I1
L
L
L
1
,W
2
,W
3
,W
P1
L
1
L
2
L
3
,Var
,Var
,Var
Q1
L
1
L
2
L
3
,VA
,VA
,VA
S1
L
1
L
2
L
3
,PF
,PF
,PF
PF1
L
1
L
2
L
3
,tg
,tg
,tg tg1 kWh
Imported row 2 row 3
U2 U23 I2 P2 Q2 S2 PF2 tg2
U3 U31 I3 P3 Q3 S3 PF3 tg3 active energy
EnP
Backlit symbols
-, kWh kVarh kVarh
L
1
L
2
L
3
, THD U
, THD U
, THD U
L
1
L
2
L
3
, THD I
, THD I
, THD I
Displayed values row 1 row 2 exported active energy reactive inductive energy
/ reactive positive energy reactive capacitive energy
/ reactive negative energy
Uh1 V /
THD1 %
Uh2 V /
THD2 %
Ih1 A /
THD1 %
Ih2 A /
THD2 % row 3 Uh3 V /
THD3 %
Ih3 A /
THD3 %
Displayed symbols
Displayed values row 1 row 2 row 3 kWh
THD imported harmonic active. energy
L
L
L
1
2
3
, THD I
, THD I
, THD I kWh
THD
Uh1n* % exported
Uh2n* % harmonic active
Uh3n* % energy
L1, THD I
L3, THD I c
L2, THD I
Ih1n* % cos(ϕ1)
Ih2n* % year cos( ϕ2) month
Ih3n* % cos( ϕ3) day
*
Harmonic voltage (current) of L1, L2, L3 phases for n-harmonic
Displayed quantities in the field 8 (fig. 5.)
Table 2
Displayed symbols
Displayed values in the row 4
3L A A
I mean
3-phase
I
(N)
W
ΣP
3- phase
Var
ΣQ
3-phase
VA
ΣS
3-phase
PF
PF
3-phase tg tg
3-phase
W
ΣP 3-phase
(15 min or
30 min or 60 min)
Backlit symbols
Displayed values in the row 4 c cos( ϕ)
3-phase hour : minutes
Hz frequency
%
Consumption of ordered power
(in 15, 30 or 60 minutes’ time)
10
The exceeding of the upper indication range is signaled on the display by upper horizontal lines, however the exceeding of the lower range is signaled by lower horizontal lines.
In case of averaged power measurement ΣP
3-phase
, single measurements are carried out with a 15 seconds’ quantum. Suitably to the 15 min, 30 min, 60 min selection, 60,
120 or 240 measurements are averaged. After starting the meter or the power erasing, the first value will be calculated after 15 seconds since the meter switching on or erasing. Till the time to obtain all active power samples, the value of averaged power is calculated from already measured samples.
The current in the neutral wire I
(N) is calculated from phase current vectors
The value of consumed ordered power can be used for a previous warning against the exceeding of ordered power and to escape of fines related with it. The consumption of ordered power is calculated on the base of time interval set for the synchronization of the mean active power and the value of ordered power (section
6.5.1). the consumption example is presented in the section 6.5.3.
The alarm switching on is signaled by the lighting of the AL1 inscription ( in the mode
AL1-3: of AL1, AL2, AL3 inscriptions). The end of alarm duration at the alarm signaling support switched on, is indicated by the pulsation of the AL1 inscription ( in the mode AL1-3: of AL1, AL2, AL3 inscriptions).
11
Fig. 7. Operating modes of the ND20 meter.
12
For the configuration of ND20 meters, a free LPCon software is destined and is available on the www.lumel.com.pl
/en/ web site
Fig 8. Setup menu
The entry in the programming mode is carried out through the pressure and holding down of the
push-button during ca 3 sec. The entry in the programming mode is protected by the access code. If there is not such a code, the program transits into the programming option. The inscription SET is displayed (in the first row) and the first group of PAr parameters. The monitoring of parameters is always available through the pressure and holding down the push-button during ca 3 sec.
6.5.1. Setting of Meter Parameters
Select the PAr mode in options (by choice by the
or
push-button.
push-buttons) and approve the
Table 3
Item Parameter name
Designation
Range
SECU oFF,
1… 60000
Notes/description
0 – without code
Manufac- turer’s value
0 1 Introduction the access code
2 Ratio of the current transformer
3
4
Ratio of the voltage transformer
Synchronization of mean active power tr_I 1 … 10000 tr_U 0.1…4000.0
1
1
15
5 Number of the measured harmonic/THD
Syn 15, c_15, c_30, c_60
Synchronization of mean active power:
15 - 15 minutes’ walking window (record synchronized with the clock every 15 minutes) c_15 – measurement synchronized with the
clock every 15 minutes. c_30 – measurement synchronized with the
clock every 30 minutes, c_60 – measurement synchronized with the
clock every 60 minutes,
ALL,
2…21, tHd – THD
ALL – successive calculations of harmonics inserted in registers tHd
13
6 Storage of minimum and maximum values with errors to calculate reactive power erLi oFF, on
2…21 – harmonic number ( in this mode, the active energy is calculated) oFF – storage of only correct values (from the measuring range). on – storage of also error occurrences in measurements (values in registers 1e20 and
1e20)
TrGle: sinUs:
Q
=
Q i k
∑
=
1
U i
=
*
I i
S
2
−
P
2
* sin
(
∠
U i
,
I i
) on trGLE k – harmonic number, k = 21 for 50 Hz, k = 18 for 60 Hz
8
10
Way to calculate reactive energy
Erasing of watt-hour meters
En_q
En 0
PA 0 cAP, sIGn no, EnP,
Enq, EnH,
ALL no, yES cAP – inductive and capacitive energy sIGn – positive and negative energy backlit diSP oFF,1…60, off – disabled, on – enabled, 1..60 – time in on seconds of backlit support since the pushbutton pressure. no – lack of actions, EnP – erasing of active energy, Enq – erasing of reactive energy,
EnH – erasing of harmonic energy. ALL – erasing of all energy. yES – erasing of power of mean active power
12 Erasingof mean active
PAr0 no, yES yES – erasing of archive power archive
13 Ordered power PAor 0…144.0
14 Manufacturer’s parameters dEf no, yES
Ordered power for forecasting the power consumption in % of the rated value
Restoration of manufacturer’s parameters of the group.
The automatic erasing of energy is carried out:
- for active energy when changing: voltage or current ratio;
- for reactive energy when changing: voltage or current ratio, the way of reactive
power calculation;
- for energy of harmonics when changing: voltage or current ratio, when changing
the measured harmonic number.
Values are set by means of set digit is selected by means of
and
and
push-buttons, however the position of the
push-buttons. The active position is signaled by the cursor. The value is accepted by the
push-button and resigned cAP on no no no
100.0 no by the pressure of the push-button. During the acceptation, the value insertion possibility in the range is checked. In case when the value is set beyond the range, the meter remains in the parameter edition mode, however the value is set on the maximum value (when the value is too higher) or on the minimum value (when the value is too lower).
14
Item
6.5.2. Setting of Output Parameters
Select the out mode in options and approve the choice by the
Parameter name DesiRange
push-button.
Table 4
Notes/description Manufac- gnation turer’s
1 Quantity on the continuous output (code acc. to the table 6)
2 Type of continuous output
An_A 0_20, 4_20 The selection 4_20 causes the switching on of the minimum output current limitation on the level ca 3.8 mA.
AnIL -144.0…144.0 in % of the rated quantity value
value
oFF
0_20
3 Lower value of the input range
4 Upper value of the input range
5 Lower value of the output range
AnIH
AnOL
-144.0…144. 0
0.00 … 24.00 w % of the rated quantity value in mA
0
100.0
0
6 Upper value of the output range
7 Output operation mode
AnOH
Antr
0.00 … 24.00 nor,
AnOL,
AnOH in mA
Operating mode of the continuous output:
nor – normal work,
AnoOL – set value AnOL,
AnOH – set value AnOH,
20 nor
8
9
10
11
12
Output value at error
Number of impulses
Address in MODBUS network
Transmission mode
Baud rate
13 Manufacturer’s parameters
AnEr
Io_n
Adr
0 … 24
5000 … 20000
1…247 trYb 8n2, 8e1, 8o1,
8n1 bAUd dEf
4.8 k, 9.6 k,
19.2 k, 38.4 k no, yES in mA
Number of impulses for 1 kWh
24
5000
1
8n2
Restoration of manufacturer’s parameters of the group
9.6 k no
6.5.3. Setting of Alarm Parameters
Select the ALr mode in options and approve the choice by the push-button.
Table 5
Item Parameter name Designation
Range Notes/description Manufac- turer’s value
P 1 Quantity in the alarm
2 output (code acc. to the table 6 )
Alarm type n-on
3
AL_t n-on, n-oFF, on,oFF, Hon,
Fig. 9.
HoFF, AL1-3
ALoF -144.0…144.0 in % of the rated quantity value 99
4
Lower value of the input range
Upper value of the input range
ALon -144,0…144,0 in % of the rated quantity value 101
15
Item/ value in register
4015
08
09
10
11
12
13
04
05
06
07
00
01
02
03
5
6
Time delay of the switching reaction
ALdt
AL_S
0 … 900 oFF, on in seconds ( for quantities
AL._n =P_ord. the delay occurs only when switching the alarm on.
In the situation when the support function is enabled, after the retreat of the alarm state the alarm symbol is not blanked but begins to pulsate.
In the AL1-3 alarm mode, the signaling support is always enabled, independently of the setting. The signaling exists till the moment of blanking it by
Support of the alarm occurrence signaling means of the and
push-buttons combination (during 3 seconds).
The function concerns only and exclusively the alarm signaling, then relay contacts will be active without support,
7 Interlocking of a renewed alarm switching on
8 Manufacturer’s parameters acc. to the selected type of alarm.
AL._b 0…900 dEf no, yES Restoration of manufacturer’s parameters of the group.
The write of the value ALon lower than ALoF switches the alarm off.
Selection of the monitored value:
Table 6
Displayed parameter
off
U_1
I_1
P_1 q_1
S_1
PF1 tg1
U_2
I_2
P_2 q_2
S_2
PF2
Kind of quantity
lack of quantity /alarm disabled/ voltage of phase L1 current in the phase wire L1 active power of phase L1 reactive power of phase L1 apparent power of phase L1 active power factor of phase L1 tg ϕ coefficient of phase L1 voltage of phase L2 current in the phase wire L2 active power of phase L2 reactive power of phase L2 apparent power of phase L2 active power factor of phase L2
0 oFF
0 no
Value for the percentage conversion of alarm values and outputs
(100%)
none
Un [V] *
In [A] *
Un x In x cos(0°) [W] *
Un x In x sin(90°) [var] *
Un x In [VA] *
1
1
Un [V] *
In [A] *
Un x In x cos(0°) [W] *
Un x In x sin(90°) [var] *
Un x In [VA] *
1
1
16
15
16
17
18
19
20
21
22
23
24
U_3
I_3
P_3 q_3
S_3
PF3 tg3
U_A
I_A
P voltage of phase L3 current in the phase wire L3 active power of phase L3 reactive power of phase L3 apparent power of phase L3 active power factor of phase L3 tg ϕ coefficient of phase L3 mean 3-phase voltage mean 3-phase current
3-phase active power
(P1 + P2+ P3)
25
26 q
S
3-phase reactive Power
(Q1 + Q2 + Q3)
3-phase apparent Power
(S1 + S2 + S3 )
27 PF_ A 3-phase active power factor
28 Tg_ ϕ coefficient
29
30
FrEq
U12 frequency phase-to-phase voltage L1-L2
31
32
33
34
U23
U31
U4_A
P_At phase-to-phase voltage L2-L3 phase-to-phase voltage L3-L1 mean phase-to-phase voltage mean active power
35
P_ord
Used percentage of the ordered active power (consumed energy)
*Un, In – rated values of voltages and currents
Un [V] *
In [A] *
Un x In x cos(0°) [W] *
Un x In x sin(90°) [var] *
Un x In [VA] *
1
1
Un [V] *
In [A] *
3 x Un x In x cos(0°) [W]
*
3 x Un x In x sin(90°)
[var] *
3x Un x In [VA] *
1
1
100 [Hz]
3
Un [V] *
3
Un [V] *
3
Un [V] *
3
Un [V] *
3 x Un x In x cos(0°) [W]
*
100% a) n-on b) n-OFF
17
c) On d) OFF
Fig. 9. Alarm types: a),b) normal c) disabled d) enabled.
Remaining types of the alarm:
− H-on – always enabled;
− H-oFF – always disabled,
− AL1-3 – in this mode, the alarm quantity must be from the range:0-7. When the alarm appears on whichever phase, the relay will be enabled and the suitable symbol will be lighted
− ( AL1 – phase 1, AL2 – phase 2,
AL3 – phase 3. It will be disabled only when all alarms disappear. Alarms operate in the n-on mode with identical hysteresis thresholds ALof and ALon for each phase.The alarm condition withdraw is signaled by the pulsation of the alarm symbol regardless of the set support value of the alarm signaling. The blanking of the signaling support follows after pressing and
pushbuttons (during 3 sec).
Example no 1 of alarm setting:
Set the alarm of n-on type for the monitored quantity P – 3-phase active power, version: 5 A; 3 x 230/400 V. Switching the alarm on, after exceeding 3800 W, switching the alarm off after decreasing 3100 W.
Calculate
: rated 3-phase active power: P = 3 x 230 V x 5 A = 3450 W
3450 W – 100 % 3450 W – 100 %
3800 W – ALon % 3100 W – ALoF %
It appears: ALon = 110 % ALoF = 90 %
Set: Monitored quantity: P; Kind of alarm: n-on, ALon 110, ALoF 90.0.
Example no 2 of alarm setting:
Set the alarm of earliest warning about the possibility to exceed the ordered 1 MW power on the level 90% at the hourly accounting. Measuring current transformer
2500:5 A, voltage : 230 V, Instantaneous maximum import of power: 1.5 MW.
Calculate:
rated 3-phase active power of the ND20 meter: P = 3 x 230 V x 2500 A
(500 * 5 A) = 1.725 MW (500 * 3450 W) – 100%;
90% of ordered power / rated power = 90.0% * 1 MW / 1.725 MW = 52.1 % of the rated meter value (rounding down).
The’ ordered hourly power (energy for consumption): 1 MWh / 4 quarters = 900 MWs,
90% - 810 MWs. Remaining 10% at maximum power import would be used in time:
900 MWs / 1.5 MW = 60 s
18
Fig 10. Measurement of used ordered 15 minutes’ active power consumption
synchronized with the clock, with alarm set on a 90% consumption.
Set
: Monitored quantity:P_ord, Kind of alarm: n-on, ALon = 90.0, ALoF = 89.9,
Tr_1 = 500, Syn = c_60, Time delay ALdt = 0 or 240 s.
An example of the parameter value utilization of ordered active power to switch the alarm on is presented on the fig. 10.
The time delay is set on 0 sec.
In the calculated example, for remaining 10% of ordered power, at the maximum power consumption, devices could still work during 60 sec without exposing customers to fines. when setting the time delay ALdt on 60 sec, the alarm would not be enabled.
6.5.4. Setting Date and Time
Select the dAtE mode in options and approve the choice by the
Seconds are reset after setting hour and minute values.
1
2
3
Hour, minute
Month, day
Year t_H t_d t_y
push-button.
Table 7 range Remarks/description Manufacturer’s value
0…23, 0..59
1…12, 1…31
2001 … 2100
0.00
1.01
2001
19
6.6. Configuration of THD Measurement, Harmonics and
Energy for the Harmonic
The meter has 3 work modes related to the THD and harmonic calculation. When setting the parameter of the harmonic number:
- tHd – the meter measures every 1 second only the THD value for currents and voltages, the result is exposed on the display and expressed in registers in percentages. Energy of harmonics is reset and particular harmonics include the error value (1e20);
- All – the meter measures harmonics from 2 up to 21, for 50 Hz frequency (from 2 up to 18 for 60 Hz frequency). Energy of harmonics is reset.
- 2 – 21 – measurement of the selected harmonic value, every 1 second, the result is exposed on the display and in basic units (V, A) in registers. Energy for the given harmonic is counted up.
The switching of the harmonic number or the change of voltage or current ratio resets energy for harmonics.
6.7. Archive – Active Power Profile
The ND20 meter is equipped with an archive allowing to store up to 9000 measurements of mean active power. Mean active power P
AV
is archived with a 15,
30, 60 minutes’ interval of time, synchronized with the real time clock. In case of operation in the 15 minutes’ walking window mode, the archiving is performed in the same way as for the 15 minutes’ interval of time (fig. 11). The direct access to the archive is for 15 records including the date, time and value placed in the range of addresses 1000 -1077. The position of the first (oldest) archived sample is placed in the register 1000, however the position of the last archived sample (youngest) is placed in the register 1001. the value of the first record, from 15 available records placed in registers 1003 – 1077, is written in the register 1002. The write of the first read out record value (1 – 9000) causes the data updating of 15 records for readout.
In registers, in which samples were not already been written, are 1e20 values.
The archive is organized in the shape of a circular buffer. After writing the 9000 th value, the next overwrites the oldest with number 0, and the successive, the next with number 1, etc.
If the value of the register 1000 is higher than 1001, that means that the buffer was overflowed one time at least. Eg, the value 15 in the register 1000, and 14 in the register 1001 means, that there were already more than nine thousand samples and oldest samples are from the record 15 up to 9000, next from the record 1 to the youngest record with number 14.
The change of the current or voltage ratio, kind of mean power, causes the archive erasing.
The reset of averaged power or the change of averaging time does not erase the archive.
The automatic erasing of the archive and averaged power is performed when changing the voltage or current ratio.
20
Fig. 10. Measurement of 15 minutes’ mean active power synchronized with the clock.
7. RS-485 INTERFACE
Parameter set of the serial ND20 meter link:
▪ identifier: 0xBC
▪ meter address:1..247
▪ baud rate: 4.8, 9.6, 19.2, 38.4 kbit/s,
▪ working mode: Modbus RTU,
▪ information unit: 8N2, 8E1, 8O1, 8N1,
▪ maximum response time when requesting for
archive: 1000 ms.
▪ maximum response time at remaining
requests: 750 ms.
▪ maximum quantity of read out registers in one request
- 40 registers – 4-byte registerss
- 80 registers – 2-byte registers
▪ implemented functions: 03, 16, 17,
- 03 - readout of registers,
- 16 - write of registers,
- 17 - device identification,
Manufacturer’s settings: address 1, baud rate: 9600 baud, RTU 8N2 mode,
Map of ND20 meter registers
In the ND20 meter, data are placed in 16 and 32-bit registers. Process variables and meter parameters are placed in the address area of registers in a way depended on the variable value type. Bits in 16-bit registers are numbered from the youngest to the oldest (b0-b15). 32-bit registers include numbers of float type in IEEE-754 standard. Sequence of 3210 bytes – the oldest is transmitted as the first.
21
Table 8
Address range
1000 – 1077
4000 – 4053
Type of value
Integer
(16 bits)/ record
Integer
(16 bits)
Description
Archive of the averaged power profile. The table 9 includes the register description.
The value is placed in one 16-bit register. The table 10 includes the register description. Registers for write and readout.
7000 – 7121
7500 – 7659
Float
(2x16 bits)
Float
(32 bits)
Value placed in two successive 16-bit registers. Registers include the same data as 32-bit registers from the area 7500 – 7659.
Registers for readout. Sequence of bytes (3-2-1-0).
Value placed in one 32-bit register. The table 11 includes the register description. Registers for readout.
7800 – 8038
7660 – 7779
Float
(2x16 bits)
Float
(32 bits)
Value placed in two successive 16-bit registers. Registers include the same data as 32-bit registers from the area 7660 – 7779.
Registers for readout. Sequence of bytes (3-2-1-0).
Value placed in one 32-bit register. The table 11 includes the register description. Registers for readout.
Address of 16 bit- registers
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
Operations
R
R
R/W First available record – NrBL (range 1…9000)
R
R
R
R
R
R
R
R
Description
Position of oldest archived mean power.
Position of youngest archived mean power
Year of archived mean power with number NrBL + 0
Month * 100 + day of archived mean power with number NrBL + 0
Hour * 100 + minute of archived mean power with number NrBL + 0
Value of archived mean power with number NrBL + 0 float type – 4 bytes in sequence 3-2-1-0
Year of archived mean power with number NrBL + 1
Month * 100 + day of archived mean power with number NrBL + 1
Hour * 100 + minute of archived mean power with number NrBL + 1
1011 R Value of archived mean power with number NrBL + 1
1012 R
…
1073
1074
1075
…
R
R
R
…
Year of archived mean power with number NrBL + 14
Month, day of archived mean power with number NrBL + 14
Hour, minute of archived mean power with number NrBL + 14
1076 R Value of archived mean power with number NrBL + 14
1077 R
Table 9
Table 10
Register address
4000
4001
4002
4003
Operation
RW
RW
RW
RW
Range
0…60000
0…900 [s]
0…1200 [‰]
0
Description
Protection - password
Interlocking time of the renewed switching of the relay output on
Ordered mean power *10 of nominal signals
Current transformer ratio
By default
0
0
1000
0
22
4002
4003
4004
4005
4006
4007
RW
RW
RW
RW
RW
RW
0
1...10000
1...40000
0..3
0…22
0,1
Reserved
Current transformer ratio
Voltage transformer ratio *10
Synchronization of mean active power:
0 – 15 minutes’ walking window (record
synchronized every 15 minutes with the clock)
1 – measurement synchronized every 15 minutes
with the clock
2 – measurement synchronized every 30 minutes
with the clock
3 – measurement synchronized every 60 minutes
with the clock
Number of the measured harmonic/
0 – THD, 1 – all harmonics are successively measured and placed in registers 7660-7780, 2…21
– harmonic number with energy.
Storage way of minimum and maximum values
0 – without errors, 1 – with errors
Way to calculate reactive power:
0 -
Q
=
S
2
−
P
2
4008 RW 0.1
4009
4011
4012
4013
4014
RW 0.1
4010 RW 0…61
RW
RW
RW
RW
0…4
0.1
0.1
0.1
1 -
Q
=
i k
∑
=
1
U i
*
I i
* sin
(
∠
U i
,
I i
) k – harmonic number, k = 21 for 50 Hz k = 18 dla 60 Hz
Way to calculate reactive energy:
0 – inductive and capacitive energy
1 – positive and negative energy
Display backlit: 0 – disabled, 1-60 – backlit time in seconds since the push-button pressure,
61 – always enabled
Erasing of watt-hour meters:
0 – without changes, 1- erase active energy,
2 – erase reactive energy, 3 – erase energy of harmonics, 4 – erase all energy.
Erasing of mean active power P
AV
Erasing of the averaged power archive
Erase min and max
4015
4016
RW
RW
0.1..35
0..6
Quantity on the alarm relay output
(code acc. to the table 6)
Output type: 0 – n-on, 1– n-oFF, 2 – on, 3 - oFF,
4 – H-on, 5 – H-oFF, 6 - AL1-3
4017
4018
RW
RW
-1440...0...1440
[
o
/ oo
]
-1440...0…440
[
o
/ oo
]
Lower alarm switching value of the ratek input range
Upper alarm switching value of the ratek input range
4019
4020
4021
4022
4023
RW
RW
RW
RW
RW
0..900 s
0.1
0,1..35
0.1
-1440..0..1440
[
o
/ oo
]
Delay of the alarm switching ( for quantity AL_n =
P_ord – rgister 4015 =35, the delay occurs only when the alarm is switched on.
Alarm signaling support
Quantity on the continuous output no 1/ code acc. to the table 6 /
Continuous output type: 0 – 0...20 mA; 1 – 4…20 mA
Lower value of the input range in [
o
input range.
/ oo
] of the rated
0
0
0
1
10
0
0
0
61
0
0
0
0
24
0
990
1010
0
0
24
0
0
23
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
R
R
R
R
R
R
R
R
R
R
R
4024
4025
4026
4027
RW
RW
RW
RW
0..3
0.1
0...2359
101…1231
2009…2100
0,1
0..15258
0..65535
0..15258
0..65535
0..15258
0..65535
0..15258
0..65535
0..15258
0..65535
0..15258
0..65535
0..65535
0..65535
0..65535
0..65535
-1440..0..1440
[
o
/ oo
]
-2000..0..2000
[10 uA]
1..2000 [10 uA]
0..2
0…24 [mA]
1000…20000
1..247
0..3
Upper value of the input range in [
o
/ oo
] of the rated input range.
Lower output range value of the output [10 uA]
Upper output range value of the output [10 uA]
Manual switching of the analog output 1:
0 – normal work,
1 – set value from the register 4026,
2- set value from the register 4027,
Analog output value when error
Number of impulses for the impulse output
Address in the MODBUS network
Transmission mode: 0->8n2, 1->8e1, 2->8o1,
3 ->8n1
Baud rate: 0->4800, 1->9600 2->19200,
3 ->38400
Update the transmission parameter change
Hour *100 + Minutes
Month * 100 + day
Year
Record of standard parameters (together with the reset of energy and min, max, averaged power)
Imported active energy, two older bytes
Imported active energy, two younger bytes
Exported active energy, two older bytes exported active energy, two younger bytes
Reactive inductive energy, two older bytes
Reactive inductive energy, two younger bytes
Reactive capacitive energy, two older bytes
Reactive capacitive energy, two younger bytes
Imported harmonic active energy, two older bytes
Imported harmonic active energy, two younger bytes
Exported harmonic active energy, two older bytes
Exported harmonic active energy, two younger bytes
Status register – description below
Serial number, two older bytes
Serial number, two younger bytes
Program version (*100)
In parenthesis [ ], suitably is placed: resolution or unit.
1000
0
2000
0
Energy is made available in hundreds of watt-hours (var-hours) in double 16-bit register, and for this reason, one must divide them by 10 when calculating values of particular energy from registers, ie:
Imported active energy = (register 4038 value x 65536 + register 4039 value) /10 [kWh]
Exported active energy = (register 4040 value x 65536 + register 4041 value) /10 [kWh]
Reactive inductive energy = (register 4042 value x 65536 + register 4043 value) /10 [kVarh]
Reactive capacitive energy = (register 4044 value x 65536 + register 4045 value) /10 [kVarh]
Imported active harmonic energy = (register 4046 value x 65536 + register 4047 value) /10 [kWh]
Exported active harmonic energy = (register 4048 value x 65536 + register 4049 value)/ 10 [kWh]
24
5000
1
0
1
0
0
101
2009
0
0
0
0
0
0
0
0
0
0
0
0
-
-
-
24
Status register:
Bit 15 – „1” – damage of the non-volatile memory Bit 7 – „1” – the interval of averaged power is not
Bit 14 – „1” – lack of calibration or erroneous
calibration
Bit 13 – „1” – error of parameter values elapsed
Bit 6 – „1” – frequency for THD calculation beyond intervals
− 48 – 52 for frequency 50 Hz,
− 58 – 62 for frequency 60 Hz
Bit 5 – „1” – voltage too low for frequency measurements
Bit 12 – „1” – error of energy values
Bit 4 – „1” – too low voltage of phase C
Bit 11 – „1” – error of phase sequence
Bit 10 – current range „0” – 1 A~; 1” – 5 A~
Bit 9 Bit 8
0 0
0 1
Voltage range
Bit 3 – „1” – too low voltage of phase B
Bit 2 – „1” – too low voltage of phase A
Bit 1 – the RTC time battery is used up
Bit 0 – state of relay output „1” – On, „0” - off
Table 11
Address of 32-bit
7515
7516
7517
7518
7519
7520
7521
7522
7523
7524
7525
7526
7527
registers
7500
7501
7502
7503
7504
7505
7506
7507
7508
7509
7510
7511
7512
7513
7514
Address of 16-bit
7030
7032
7034
7036
7038
7040
7042
7044
7046
7048
7050
7052
7054
registers
7000
7002
7004
7006
7008
7010
7012
7014
7016
7018
7020
7022
7024
7026
7028
Operation
Description
R Voltage of phase L1
R Current in phase L1
R Active power of phase L1
R Reactive power of phase L1
R Apparent power of phase L1
R Power factor (PF) of phase L1
R Ratio of reactive power/active power of phase L1
R Voltage of phase L2
R Current in phase L2
R Active power of phase L2
R Reactive power of phase L2
R Apparent power of phase L2
R Power factor (PF) of phase L2
R Ratio of reactive power/active power of phase L2
R Voltage of phase L3
R Current in phase L3
R Active power of phase L3
R Reactive power of phase L3
R Apparent power of phase L3
R Power factor (PF) of phase L3
R Ratio of reactive power/active power of phase L3
R Mean 3-phase voltage
R Mean 3-phase current
R 3-phase active power
R 3-phase reactive power
R 3-phase apparent power
R Mean power factor (PF)
R Mean ratio of reactive power/ active power
Unit
7058
7060
7062
7064
7066
7529
7530
7531
7532
7533
R Phase-to-phase voltage L
1-2
R Phase-to-phase voltage L
R Phase-to-phase voltage L
2-3
3-1
R Mean phase-to-phase voltage
R 3-phase 15, 30, 60 minutes’ active Power (P1 + P2 + P3)
W var
VA
-
-
V
A
W var
VA
-
-
Hz
V
V
V
V
W
-
-
V
A
A
W var
VA
V
A
W var
VA
-
-
V
25
7104
7106
7112
7114
7138
7140
7142
7144
7146
7148
7150
7152
7154
7156
7116
7118
7120
7122
7124
7126
7128
7130
7132
7134
7068
7070
7072
7074
7076
7078
7080
7082
7534
7535
7536
7537
7538
7539
7540
7541
R Harmonic U1 / THD U1
R HarmonicU2 / THD U2
R Harmonic U3 / THD U3
R Harmonic I1 / THD I1
R Harmonic I2 / THD I2
R Harmonic I3 / THD I3
R Cosinus of angle between U1 and I1
R Cosinus of angle between U2 and I2
7084
7086
7088
7090
7542
7543
7544
7545
R Cosinus of angle between U3 and I3
R 3-phase mean cosinus
R Angle between U1 and I1
R Angle between U2 i I2
7092
7094
Imported 3-phase active energy (number of overflows in
7096 7548 R register 7549, reset after exceeding 99999999.9 kWh)
7098
7546
7547
7549
R Angle between U3 i I3
R Current in neutral wire (calculated from vectors)
R
Imported 3-phase active energy ( counter totting up to
99999.9 kWh)
V / %
V / %
V / %
A / %
A / %
A / %
-
-
°
°
-
-
°
A
100 MWh kWh
100 MWh
7102
7108
7110
7569
7570
7571
7572
7573
7574
7575
7576
7577
7578
7551
7553
R
R
Exported 3-phase active energy (counter totting up to
99999.9 kWh)
3-phase reactive inductive energy ( counter totting up to
99999.9 kVarh) kWh
100
Mvarh kvarh
100
Mvarh kvarh
7560
7561
7562
7563
7564
7565
7566
7567
7555 R
3-phase reactive capacitive energy ( counter totting up to
99999.9 kVarh)
Imported 3-phase active harmonic energy (number of
7556 R
99999999.9 kWh)
7557 R
Imported 3-phase active harmonic energy ( counter totting up to 99999.9 kWh)
Exported 3-phase active harmonic energy (number of overflows in register 7559, reset after exceeding
99999999.9 kWh)
7559 R
Exported 3-phase active harmonic energy ( counter totting up to 99999.9 kWh)
R Time – hours, minutes
R Time – month, day
R Time – year
R Analog output control
R Voltage L1 min
R Voltage L1 max
R Voltage L2 min
R Voltage L2 max
100 MWh kWh
100 MWh kWh
R
R
R
R
R
R
R
R
R
R
Voltage L3 max
Current L1 min
CurrentL1 max
Current L2 min
Current L2 max
Current L3 min
Current L3 max
Active power L1 min
Active power L1 max
Active power L2 min
V
V
V
V
-
-
-
Ma
A
A
A
A
V
V
A
A
W
W
W
26
7206
7208
7210
7212
7214
7216
7218
7220
7190
7192
7194
7196
7198
7200
7202
7204
7174
7176
7178
7180
7182
7184
7186
7188
7158
7160
7162
7164
7166
7168
7170
7172
7222
7224
7226
7228
7230
7232
7234
7236
7238
7240
7242
7244
7246
7248
7250
7254
7256
7258
7260
7262
7264
7266
7268
7270
7272
7274
7603
7604
7605
7606
7607
7608
7609
7610
7595
7596
7597
7598
7599
7600
7601
7602
7587
7588
7589
7590
7591
7592
7593
7594
7579
7580
7581
7582
7583
7584
7585
7586
7611
7612
7613
7614
7615
7616
7617
7618
7619
7620
7621
7622
7623
7624
7625
7627
7628
7629
7630
7631
7632
7633
7634
7635
7636
7637
R Active power L2 max
R Active power L3 min
R Active power L3 max
R Reactive power L1 min
R Reactive power L1 max
R Reactive power L2 min
R Reactive power L2 max
R Reactive power L3 min
R Reactive power L3 max
R Apparent power L1 min
R Apparent power L1 max
R Apparent power L2 min
R Apparent power L2 max
R Apparent power L3 min
R Apparent power L3 max
R Power factor (PF) L1 min
R Power factor (PF) L1 max
R Power factor (PF) L2 min
R Power factor (PF) L2 max
R Power factor (PF) L3 min
R Power factor (PF) L3 max
R Ratio of reactive/active power L1 min
R Ratio of reactive/active power L1 max
R Ratio of reactive/active power L2 min
R Ratio of reactive/active power L2 max
R Ratio of reactive /active power L3 min
R Ratio of reactive/active power L3 max
R Phase-to-phase voltage L
R Phase-to-phase voltage L
1-2
min
R Phase-to-phase voltage L
1-2 max
R Phase-to-phase voltage L
2-3
min
R Phase-to-phase voltage L
2-3
max
3-1
min
R Phase-to-phase voltage L
3-1
R Mean 3-phase voltage min
max
R Mean 3-phase voltage max
R Mean 3-phase current min
R Mean 3-phase current max
R 3-phase active power min
R 3-phase active power max
R 3-phase reactive power min
R 3-phase reactive power max
R 3-phase apparent power min
R 3-phase apparent power max
R Power factor (PF) min
R Power factor (PF) max
R Ratio of mean 3-phase reactive/active power min
R Ratio of mean 3-phase reactive/active power max
R Frequency max
R Mean phase-to-phase voltage min
R Mean phase-to-phase voltage max
R Mean active power min
R Mean reactive power max
R Harmonic U1 / THD U1 min
R Harmonic U1 / THD U1 max
R Harmonic U2 / THD U2 min
R Harmonic U2 / THD U2 max
R Harmonic U3 / THD U3 min
R Harmonic U3 / THD U3 max
Hz
V
V
W
W
V / %
V / %
V / %
V / %
V / %
V / %
A
W
W var
V
V
V
A var
VA
VA
-
-
-
-
Hz
V
V
V
V
-
-
-
V
-
-
-
-
-
-
-
- var
VA
VA
VA
VA
VA
VA
-
W
W
W var var var var var
27
7838
7840
…
7878
7880
…
7918
7920
7308
7310
7312
7314
7316
7318
7800
…
7292
7294
7296
7298
7300
7302
7304
7306
7276
7278
7280
7282
7284
7286
7288
7290
7958
7960
7998
8000
7679
7680
…
7699
7700
…
7719
7720
7654
7655
7656
7657
7658
7659
7660
…
7646
7647
7648
7649
7650
7651
7652
7653
7638
7639
7640
7641
7642
7643
7644
7645
7739
7740
7759
7760
R Harmonic I1 / THD I1 min
R Harmonic I1 / THD I1 max
R Harmonic I2 / THD I2 min
R Harmonic I2 / THD I2 max
R Harmonic I3 / THD I3 min
R Harmonic I3 / THD I3 max
R Cosinus of angle between U1 i I1 min
R Cosinus of angle between U1 i I1 max
R Cosinus of angle between U2 i I2 min
R Cosinus of angle between U2 i I2 max
R Cosinus of angle between U3 i I3 min
R Cosinus of angle between U3 i I3 max
R Mean 3-phase cos min
R Mean 3-phase cos max
R Angle between U1 i I1 min
R Angle between U1 i I1 max
R Angle between U2 i I2 min
R Angle between U2 i I2 max
R Angle between U3 i I3 min
R Anlgle between U3 i I3 max
R Current in neutral wire min
R Current in neutral wire max
R U1 – harmonic 2
… …
R U1 - harmonic 21
R U2 - harmonic 2
… …
R U2 - harmonic 21
R U3 - harmonic 2
… …
R U3 - harmonic 21
R I1 - harmonic 2
R I1 - harmonic 21
R I2 – harmonic 2
R I2 - harmonic 21
R I3 - harmonic 2
8038
8040
7779
7780
R I3 - harmonic 21
R Consumed ordered power
In case of a lower exceeding the value -1e20 is written in, however after an upper exceeding or error occurrence, the value 1e20 is written.
%
…
%
%
%
%
…
%
A
A
%
…
°
°
°
°
°
°
-
-
-
-
-
-
A / %
A / %
A / %
A / %
A / %
A / %
-
…
%
%
…
%
%
…
%
%
28
8. ERROR CODES
During the meter operation, messages about errors can occur. Reasons of errors are presented below.
- Err1 – when the voltage or current is too small when measuring:
- Pf
- f i
, tg ϕ i
, cos, THD, harmonic below 10% U n
, I n,
- I
(n), below 10% U n,. below 10% I n;
- bAd Freq – When measuring harmonics and THD, if the frequency value is beyond the interval 48 – 52 Hz for 50Hz i 58 – 62 for 60 Hz;
- Err bat – is displayed when the battery of the internal RTC clock is used up. The measurement is carried out after switching the supply on and every day at midnight.
One can disable the message by the push-button.
The disabled message remains inactive till the renewed switching of the meter on.
- Err CAL, Err EE – are displayed when the meter memory is damaged. The meter must be sent to the manufacturer.
- Err PAr – are displayed when operating parameters in the meter are incorrect. One must restore manufacturer’s parameters
(from the menu level or through RS-485.
- Err Enrg –
One can disable the message by the are displayed when energy values in the meter are incorrect.
One can disable the message by the
Incorrect energy values are reset.
push-button.
push-button.
- Err L2 L3 – error of phase sequence, one must interchange the connection of phase 2 and phase 3
- - - - or - - - - - lower overflow. The measured value is smaller
than the lower measuring quantity range
- - - - or
- - - -
- upper overflow. The measured value is higher
than the upper measuring quantity range or
measurement error.
________
29
9. TECHNICAL DATA
Measuring ranges and admissible basic errors
Table 12
Measured value Indication range* Measuring range L1 L2 L3 ∑ Basic error
Current 1/5A
L1..L3
Voltage L-N
0.00 .. 60 kA 0.02 .. 6 A~ • • • ± 0.2%
Voltage L-L
0.0 .. 1.04 MV
0.0 .. 1.92 MV
2.9 .. 276 V~
10 .. 480 V~
• • •
• • •
Frequency
Active power
Reactive power
47.0 .. 63.0 Hz
-9999 MW ..0.00 W
.. 9999 MW
-9999 Mvar ..0.00 var
.. 9999 Mvar
47.0 .. 63.0 Hz
-1.65 kW ..1.4 W ..
1.65 kW
-1.65 kvar ..1.4 var ..
1.65 kvar
• • •
• • • •
• • • •
Apparent power 0.00 VA .. 9999 MVA 1.4 VA .. 1.65 kVA • • • •
Power factor PF -1 .. 0 .. 1 -1 .. 0 .. 1
• • • •
Tangent ϕ
Cosinus ϕ
-1.2 .. 0 .. 1.2
-1 ... 1
-180 ... 180
-1.2 .. 0 .. 1.2
-1 ... 1
-180 ... 180
• • • •
• • • •
• • • ϕ
Imported active energy
0 ..99 999 999,9 kWh •
± 0.2%
± 0.5%
± 0.2%
± 0.5%
± 0.5%
± 0.5%
± 2%
± 2%
± 1%
± 0.5%
± 0.5%
Exported active energy
Reactive inductive energy
Reactive capacitive energy
0 ..99 999 999,9 kWh
0 ..99 999 999,9 kVarh
0 ..99 999 999,9 kVarh
•
•
•
THD 0...400% 0...400% •
± 0.5%
± 0.5 %
± 0.5%
± 5%
* Depending on the set tr_U ratio (ratio of the voltage transformer: 0.1…4000.0)
and tr_I ratio (ratio of the current transformer: 1…10000)
Caution!
For the correct current measurement the presence of a voltage higher than
0.05 Un is required at least in one of the phase.
Power input:
- in supply circuit
≤ 6 VA
- in voltage circuit
- in current circuit
Display field
≤ 0.05 VA
≤ 0.05 VA
dedicated
Relay output
relay, voltageless NO contacts
load capacity: 250 V~/ 0.5 A~ (AC1)
Analog output
0(4)…20…24 mA
load resistance
≤ 250 Ω
basic 0.2%
30
Serial interface RS-485:
address: 1..247 mode: 8N2, 8E1, 8O1,8N1 baud rate: 4.8, 9.6, 19.2, 38,4 kbit/s transmission protocol: Modbus RTU response time: 1000 ms (requests about
archive) response time: 750 ms (remaining requests)
Energy impulse output
output of O/C type (NPN), passive of class A acc.to EN 62053-31; supply voltage 18...27V, current 10...27mA
Constant of O/C type output impulse
5000 - 20000 imp./kWh independently of set tr_U, tr_I ratios
Protection grade ensured by the casing
Weight
from frontal side from terminal side
IP 65
IP 20
0.3 kg
Overall dimensions
96 x 96 x 77 mm
Reference and rated operating conditions
- supply voltage 85…253 V d.c or a.c. (40...400 Hz)
20…40 V d.c. or a.c. (40…400 Hz)
- input signal:
- power factor
- ambient temperature
0 .. 0.005..1.2I
n
; 0.05..1.2U
n
for current, voltage
0 .. 0.1..1.2I
n
; 0..0.1..1.2U
n
; for power factors
Pf i
, t ϕ i frequency 45..63 Hz; sinusoidal ( THD
≤ 8% )
-1…0…1
-25..23..+55
°C
-30..+70
°C
- storage temperature
- relative humidity
- admissible peak factor :
- current intensity
25 ... 95 % (condensation inadmissible)
2
- external magnetic field 0...40...400 A/m
- short duration overload (5 s)
- voltage inputs 2 Un (max.1000 V)
- current inputs 10 In
- preheating time 5 min.
Battery of the real time clock:
CR2032
31
Additional errors:
in % of the basic error
- from frequency of input signals < 50%
- from ambient temperature changes < 50%/10 ºC
- for THD > 8%
Standards fulfilled by the meter:
< 100%
Electromagnetic compatibility:
- noise immunity acc. to EN 61000-6-2
- noise emissions acc. to EN 61000-6-4
Safety requirements:
according to EN 61010 -1 standard
▪ isolation between circuits: basic
▪ installation category: III
▪ pollution level: 2
▪ maximum phase-to-earth voltage:
- for supply and measuring circuits 300 V
- for remaining circuits 50 V
▪ altitude above sea level: < 2000 m
32
10. ORDERING CODES
Table 13
Meter of network parameters ND20 X X X X XX X X
Current input In:
1 A (X/1)
5 A (X/5)
1
2
Voltage input (phase/phase-to-phase) Un:
3 x 57.7/100 V
3 x 230/400 V
1
2
Analog current output:
without analog output
0 with programmable output: 0(4)…20 mA
1
Supply voltage:
85…253 V d.c. or a.c. (40…400 Hz)
20…40 V d.c. or a.c. (40…400 Hz)
Kind of version:
standard custom-made*
Language:
Polish
English other
Acceptance tests:
without extra quality requirements
*After agreeing with the manufacturer. with an extra quality inspection certificate acc. to customer’s requirements*
1
2
00
XX
P
E
X
0
1
X
Example of Order:
When ordering please respect successive code numbers.
The code: ND20- 2-2-1-1- 00- E-1 means:
ND20
– meter of network parameters of ND20 type
2
– current input In : 5 A (x/5),
2
-- input voltage (phase/phase-to-phase) Un = 3 x 230/400 V,
1
– with programmable analog output,
1
– supply voltage: 85…253 V a.c./d.c.,
00
– standard version
E
– all descriptions and user’s manual in English,
1
– with an extra quality inspection certificate.
33
11. MAINTENANCE AND GUARANTEE
The ND20 meter does not require any periodical maintenance.
In case of some incorrect operations:
After the dispatch date and in the period stated in the guarantee card:
One should return the instrument to the Manufacturer’s Quality Inspection Dept.
If the instrument has been used in compliance with the instructions, we guarantee to repair it free of charge.
The disassembling of the housing causes the cancellation of the granted guarantee.
After the guarantee period:
One should turn over the instrument to repair it in a certified service workshop.
Our policy is one of continuous improvement and we reserve the right to make changes in design and specifications of any products as engineering advances or necessity requires and to revise the above specifications without notice.
34
ND20- 09/01 (20.09.2010)
35

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Key features
- 3-phase 4-wire network parameter measurement
- Simultaneous display of measured quantities
- Digital transmission of measured values
- Measurement of RMS values of voltage and current
- Active, reactive, and apparent power measurement
- Active and reactive energy measurement
- Power factor, frequency, and mean active power measurement
- Power profile archive
- THD and harmonic measurements
- Galvanic separation between functional blocks