ANALYZER OF THE QUALITY OF
ELECTRIC POWER SUPPLY
QNA-303
(Code 771 131 / 771 133)
USER’S MANUAL
( M98155201-20 / 03A )
(c)
CIRCUTOR S.A.
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QNA-303 MANUAL CONTENTS page
1.- BASIC INSTRUCTIONS....................................................................................3
1.1.- Checking the contents of your package...........................................................3
1.2.- QNA-303 Models.............................................................................................3
1.3.- Safety warnings...............................................................................................4
1.4.- Operation instructions...................................................................................... 4
2.- MAIN FEATURES..............................................................................................5
2.1.- Basic features..................................................................................................5
2.2.- Electrical features............................................................................................6
3.- ANALYSIS MODES...........................................................................................7
3.1.- Instantaneous values of L1, L2 & L3 (4-wire connection)................................7
3.2.- Instantaneous values of L1, L2 & L3 (3-wire connection)................................7
4.- DATA COLLECTION IN MEMORY (AUTOMATIC MODE)................................ 8
5.- INSTALLATION & STARTUP............................................................................9
5.1.- Selecting the connection mode........................................................................9
5.1.1.- Selecting the connection mode (3 wires / 4 wires)................................... 10
5.1.2.- Selecting the supply voltage....................................................................10
5.2.- Connection cables.........................................................................................11
5.3.- Starting the QNA-303 analyzer up................................................................. 13
5.4.- Connection diagrams o f the QNA-303 analyzer.............................................14
5.4.1.- Direct connection.....................................................................................14
5.4.1.1.- Connection diagram for L.V. 4-wire power systems...........................14
5.4.1.2.- Connection diagram for 3-wire power systems.................................. 15
5.4.2.- Through voltage transformers:.................................................................16
5.4.2.1.- Two voltage transformers..................................................................16
5.4.2.2.- Three voltage transformers................................................................ 17
5.5.- On-board battery of the QNA-303 analyzer ................................................... 18
6.- SETTING THE QNA-303 UP...........................................................................18
6.1.- Operation setup of the QNA-303 analyzer..................................................... 19
6.1.1.- Transformation ratios of voltage transformers........................................19
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6.1.2.- Features of the monitored electrical network...........................................19
6.1.3.- Data collection process features.............................................................. 19
6.1.4.- Statistical processing...............................................................................21
6.1.5.- Quality parameters .................................................................................. 22
6.2.- Choosing the parameters to be recorded ...................................................... 23
6.2.1.- Standard File (STD).................................................................................23
6.2.2.- Events file (EVQ).....................................................................................24
6.2.3.- Incidents file (EVE)..................................................................................25
7.- QNA-303 COMMUNICATIONS........................................................................26
7.1.- Demand format..............................................................................................26
7.2.- Commands....................................................................................................27
7.2.1.- Setup commands.....................................................................................27
7.2.2.- Commands for parameter readout...........................................................28
7.2.3.- File managing commands........................................................................28
7.3.- Connections of communication cables ..........................................................29
8.- TECHNICAL SPECIFICATIONS...................................................................... 31
9.- SAFETY CONSIDERATIONS.......................................................................... 33
10.- MAINTENANCE............................................................................................... 33
11.- TECHNICAL SERVICE....................................................................................33
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1.- BASIC INSTRUCTIONS
This manual is aimed to familiarize the user with the operation of the power
supply quality analyzer model QNA-303 in order to get the best from its features.
The QNA-303 is an analyzer expressly developed for the supervision of the
quality of electric power supply, which has been built with components incorporating
the most advanced technology in microelectronics, and offer benchtop features for
the market in terms of measuring and recording of electrical magnitudes in industrial
power supply networks.
You are kindly requested to carefully read this manual before connecting
and powering the analyzer in order to avoid irreversible damage which might be
caused by an improper utilization.
1.1.- Checking the contents of your package
After receiving the analyzer, please check the following points:
a) The delivered material meets your order specifications.
b) After unpacking, check that the instrument has not been damaged in
transit.
c) The standard set includes the following items:
1 7-pin female connector.
1 4-pin female connector.
1 9-pin female connector.
1 female DB9 connector.
1 User’s guide for the QNA-303.
1 User’s guide for the Software.
1 CD containing the software for PC.
1 GSM antenna (only for the GSM model).
1.2.- QNA-303 Models
Code Model
771 131
QNA-303 RS-232/RS-485
771 133
QNA-303 GSM (Free – SIM not included)
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1.3.- Safety warnings
The manual you hold in your hands contains information and
warnings about the QNA-303 that the user should respect in order to
guarantee a proper operation of all the instrument functions and
keep its safety conditions.
If the instrument is not used as manufacturer’ s speci ficatio ns, the
protection of the instrument can be damaged.
When any protection failure is suspected to exist (for example, it presents
external visible damages), the instrument must be immediately powered OFF. In this
case contact a qualified service representative.
1.4.- Operation instructions
The QNA-303 is a programmable instrument, so offering diverse operation
modes which can be selected from the available programming menus.
Please, before initiating works with the QNA-303, thoughtfully read the paragraphs
involving INST ALLATION & ST ARTUP AND SETTING THE QNA-303 UP, in o rder
to select the most suitable operation mode for your requirements.
Note that with the instrument powered on, the terminals could be dangerous to
touching, and cover opening actions or elements removal may allow the
access to dangerous parts. Therefore, the instrument must not be used until
this is completely installed.
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2.- MAIN FEATURES
The QNA-303 is an analyzer expressly developed for the supervision of the
quality of electric power supply. Among their main characteristics, we can remark
following:
• High protection level against severe electrical conditions:
− Wide range of both supply and measuring voltages.
− High protection level against overvoltage and transient events.
• Connection to either 3 or 4-wire distribution systems.
• Inner battery which permits the instrument to go on recording works even in
case of supply voltage loss.
• Inner memory for saving all parameters measured by the QNA-303.
• Communication via GSM / RS-232 / RS-485 (according to the model).
• IP-55 rated instrument. High protection against adverse environmental
conditions.
2.1.- Basic features
The QNA-303 series analyzer is an instrument specially designed for the analysis
of the electric power quality, for that reason, it only provides voltage inputs (isolated
by means of transformers).
Moreover, the great variety of available models makes the QNA-303 suitable for
any situation and communication mode.
The inner battery of the instrument assures the continuity of the measuring
process by the QNA-303 in case of any supply voltage loss event (short or long-term
line interruption).
The QNA-303 is equipped with three A.C. voltage inputs which permit a
simultaneous measurement of the voltage from all three phases, together with the
frequency, in any power system.
To perform the analysis of the quality of the electric power supply, the QNA-303
will analyze all cycles from all three voltage phases to detect the occurrence of any
event (voltage dip, voltage swell, short and long line interruptions,...).
QNA-303 analyzers are equipped with an on-board memory (1 Mb or 3 Mb
according to the model) for the collection of quality parameters as well as events.
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The different information recorded by the QNA-303 into its on-board
memory is distributed between three file types:
• *.STD files: This file contains all values which are periodically
recorded (voltage, frequency, voltage harmonic distortion and the
harmonic content).
• *.EVE files: File which contains all incidents referred to the QNA-303
itself (file readout, setup modification, memory erasure, power
supply on/off, battery on/off...).
• *.EVQ: This file contains all events observed in the electric power
supply (voltage dips, voltage swells, interruptions) together with
some supplementary information about these events (instant of the
event occurrence, maximum/minimum voltage, average voltage,...).
2.2.- Electrical features
The application of the QNA-303 as a recording instrument for the evaluation of
the quality of the electrical power supply implies the need that this analyzer must
deliver a high protection degree against severe electrical conditions:
• Protective devices in voltage inputs: Special type fuses able to withstand
short-term pulses, which considerably increases the instrument efficiency.
• High-energy varistors for the absorption of surges in order to avoid
possible costly repairs.
• Noise filters in voltage and current inputs to assure reliable measurements
even under most adverse operation conditions.
• Power supply: transformers with an over power dissipation and insulation.
• Power supply by built-in battery to assure a voltage supply to the QNA-303
in case of voltage loss failure.
• Insulation transformers to guarantee the proper insulation of inputs.
• Enclosure: The case made of aluminium casting provides a great
mechanical toughness, but also an exceptional shield against external
electromagnetic fields which might appear in extreme situations. Logical
and measuring boards are placed inside a separated zone which even
increases the screening of sensitive components by “Faraday’s cage”
effect.
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3.- AN ALY SI S MODE S
QNA-303 series analyzers can perform under different operation modes
according to the previous setting.
Most remarkable operation settings are these following:
• Measurement and collection in memory of main power quality parameters
(voltage values, flicker and harmonics) .
• Setting of a voltage threshold to define diverse event occurrences (voltage
sags, voltage swells and interruptions). Also an optional setting of a hysteresis
value for each individual threshold.
• The QNA-303 can perform quality analysis either over 3-wire or 4-wire
distribution systems. In accordance to the choice, all quality measurement will
be referred to the line-to-neutral or line-to-line voltage..
3.1.- Instantaneous values of L1, L2 & L3 (4-wire connection)
- Line-to-neutral VOLTAGE of every phase, RMS value: V1, V2, V3.
∫
⋅== dttu
T
VrmsVn
2
)(
1
;
∑
=
N
U
N
Vrms
1
2
)(
1
- FREQUENCY: F (Hz) Measured over L1 voltage phase.
3.2.- Instantaneous values of L1, L2 & L3 (3-wire connection)
- Line-to-line VOLTAGE of every phase, RMS value: V12, V23, V31.
∫
⋅== dttu
T
VrmsVn
2
)(
1
;
∑
=
N
U
N
Vrms
1
2
)(
1
- FREQUENCY: F (Hz) Measured over L1 voltage phase.
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4.- DATA COLLECTION IN MEMORY (AUTOMATIC MODE)
The QNA-303 is equipped with an internal clock for both date and time that
permits the automatic data recording process in memory to be set (available capacity
according to the model) at regular time periods.
So, the different information recorded by the QNA-303 into its on-board
memory is distributed between three file types:
• *.STD files: This file contains all values which are periodically
recorded (voltage, frequency, voltage harmonic distortion and the
harmonic content).
• *.EVE files: File which contains all incidents referred to the QNA-303
itself (file readout, setup modification, memory erasure, power
supply on/off, battery on/off...).
• *.EVQ: This file contains all events observed in the electric power
supply (voltage dips, voltage swells, interruptions) together with
some supplementary information about these events (instant of the
event occurrence, maximum/minimum voltage, average voltage,...).
The QNA-303 is equipped with an on-board rotary memory for data collection;
which means that once this memory is full, new values overwrite oldest ones.
Therefore, if no data is wanted to be lost, data must be retrieved from the memory
before oldest values will be overwritten.
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5.- INSTALLATION & STARTUP
The manual you hold in your hands contains information and warnings
that the user should respect in order to guarantee a proper operation of
all the instrument functions and keep its safety conditions.
If the instrument is not used as manufacturer’s specifications, the
protection of the instrument can be damaged. Notice that with the instrument
powered on, the terminals could be dangerous to touching and cover opening actions
or elements removal may allow the access to dangerous parts.
When any protection failure is suspected to exist (for example, it presents
external visible damages), the instrument must be immediately powered OFF.
In this case contact a qualified service representative.
5.1.- Selecting the connection mode
The QNA-303 is a fully user-configurable instrument in terms of the kind of
network to be monitored and the supply voltage of the analyzer.
The QNA-303 can be indistinctly installed in a three-phase distribution line with
neutral conductor (4 wires) or without neutral conductor (3 wires). According to the
system, the QNA-303 voltage supply will have to be also properly selected between
230 V~ or 400 V~, depending on the existence or not of the neutral conductor.
The choice of the voltage supply and the connection mode is carried out by
means of some bridges placed inside the QNA-303 casing. Please always check the
appropriate position of this bridges before connecting and powering the QNA-303.
Before any adjustment operation is carried out, the QNA-
303 must be completely disconnected from any power
supply source.
*(D-1)
*(D-2) M2
*(D-3)
M3
M4
*(D-6)
*(D-7)
M5
M6
PF8
PF6
PF7
PF5
PF4
PF2
PF3
PF1
*(C-3)
*(C-1)
M7
M8
*(C-2)
*(B-3)
M9
M10
*(A-3)
*(B-1)
*(B-2)
M11
M12
M13
*(A-2)
*(A-1)
M14
M15
*(X-N)
*(X-N)
*(X-N)
(TIERRA)
*(D-4)
MODEM
3 / 4 WIRES
CONNECTION
TERMINAL
POWER SUPPLY
CONNECTION
TERMINAL
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5.1.1.- Selecting the connection mode (3 wires / 4 wires)
The arrangement of the distribution system to be monitored by the QNA-303
can be selected by means of an inner bridge placed inside the QNA-303 casing.
Thus, the QNA-303 will perform the analysis of the voltage incidences
according to the position of this bridge, that is, voltage events will be detected
between phase and neutral for the 4-wire arrangement, and, on the other side, these
events will be detected over line-to-line voltages for the 3-wire arrangement.
To change the position of the bridge, first of all check that the QNA-303 is
completely disconnected from the monitored main (both power supply and measuring
circuits), and then remove the frontal cover of the QNA-303. Verify that the position
of the bridge agrees with the desired system arrangement.
Finally, set also the selected configuration in the PC software, since
both settings must always fully coincide.
4-wire configuration
3-wire configuration:
Connector position:
Up
Connector position:
Down
Connector position:
Up (J1)
Connector position:
Down (J4)
5.1.2.- Selecting the supply voltage
The supply voltage of the QNA-303 for any particular application can be
selected by means of an inner bridge placed inside the QNA-303 casing.
First of all, check that the QNA-303 is completely disconnected from the
monitored main (both power supply and measuring circuits), and then remove the
frontal cover of th e Q NA-303. Verify that the position of the bridge agrees with the
desired voltage supply.
Power supply:
230 V~
Connector position:
Up
Power supply:
400 V
Connector position:
Down
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