ANALYZER OF POWER SUPPLY QUALITY
CAVA Series
(251 / 252 / 253)
USER’S MANUAL
( M98120201-03-03A )
(c)
CIRCUTOR S.A.
----- Analyzer of power supply quality CAVA-251 / CAVA-252 / CAVA-253 ------- Page No. 1
CONTENTS OF THE CAVA-251 USER’S MANUAL
page
1.- BASIC INSTRUCTIONS...........................................................................................................................2
1.1.- Check the contents of your package...........................................................................................................2
1.2.- Safety conditions........................................................................................................................................3
1.3.- Connection instructions..............................................................................................................................3
2.- MAIN FEATURES ....................................................................................................................................4
3.- CAVA MODELS........................................................................................................................................5
4.- VARIABLES MEASURED AND RECORDED BY THE CAVA............................................................6
4.1.- Instantaneous variables measured and calculated.......................................................................................6
4.2.- Parameters referred Power Supply Quality ................................................................................................7
4.2.1.- Harmonics.........................................................................................................................................7
4.2.2.- Flicker ................................................................................................................................................7
4.2.3.- Voltage sags.....................................................................................................................................8
4.2.4.- Voltage dropouts............................................................................ ¡Error! Marcador no definido.
4.2.5.- Percentage of Voltage Quality .......................................................................................................8
5.- DATA RECORDING IN MEMORY (Automatic mode)...........................................................................9
5.1.- Data recording............................................................................................................................................9
5.2.- Event file....................................................................................................................................................9
6.- INSTALLATION AND STARTUP.........................................................................................................10
6.1.- Installing the CAVA.................................................................................................................................10
6.2.- CAVA connection procedure ...................................................................................................................11
7.- OPERATION MODE...............................................................................................................................12
7.1.- Communications.......................................................................................................................................12
7.2.- Setup procedure........................................................................................................................................13
8.- SPECIFICATIONS ..................................................................................................................................15
9.- SAFETY CONSIDERATIONS
...........................................................................................16
10.- MAINTENANCE.....................................................................................................................................16
11.- TECHNICAL SERVICE..........................................................................................................................16
----- Analyzer of power supply quality CAVA-251 / CAVA-252 / CAVA-253 ------- Page No. 2
1.- BASIC INSTRUCTIONS
This manual is aimed to familiarize de user with the operation of the
measuring analyzers model CAVA in order to get the best from its features.
CAVA analyzers have been built with components incorporating the most
advanced technology in microelectronics and offer benchtop features over the
market in measurement and recording of electrical magnitudes for the control of the
quality of L.V. power systems.
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 connection.
1.1.- Check the contents of your package
After receiving the analyzer, please check the following points:
a) The analyzer model corresponds with 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 CAVA unit (Ordered model)
1 Power supply cord
1 RS-232 communication cable.
1 Instruction manual.
3.5” floppy disks with the software for PC
----- Analyzer of power supply quality CAVA-251 / CAVA-252 / CAVA-253 ------- Page No. 3
1.2.- Safety conditions
The manual you hold in your hands contains information and
warnings about the CAVA that the user should respect in order to
guarantee a proper operation of all the instrument functions and keep
its safety conditions.
1.3.- Connection instructions
Before powering and connecting the analyzer check the following points:
a) Supply voltage: 230 V a.c., ± 15 %
b) Frequency: 50...60 Hz.
c) Maximum measurable current: according to the ammeter clamp used
Clamp CP-2000-200 20 to 2000 A a.c. (switch at 2000)
2 to 200 A a.c. (switch at 200)
Clamp CPR-1000 10 to 1000 A a.c.
Clamp CPR-500 5 to 500 A a.c.
Clamp CP-200 (M1-U) 2 to 200 A a.c.
Clamp CP-100 (M1-U) 1 to 100 A a.c.
Clamp CP-5 50 mA to 5 A a.c.
NOTE: It is advisable to measure close to full-scale value to get better accuracy.
----- Analyzer of power supply quality CAVA-251 / CAVA-252 / CAVA-253 ------- Page No. 4
2.- MAIN FEATURES
CAVA series meters for the analysis of power supply quality are programmable
instruments that measure, calculate and save in memory the main quality
parameters of single-phase power systems. The set-up procedure of this instruments
is performed by means of a P.C..
Before powering the analyzer, please carefully read sections referred to
CONNECTIONS AND SET-UP to choose the most appropriate operation mode for
your requirements.
The CAVA measures in true R.M.S. mode, through the own power supply and
external, .../2V c.a., ammeter clamps (the input current is not used in the CAVA-251)
The CAVA collects data in a 1 Mb internal memory for a further
downloading to a PC. Measured and calculated data are periodically saved on that
memory at user-definable time intervals (from 5 s to 4 h).
----- Analyzer of power supply quality CAVA-251 / CAVA-252 / CAVA-253 ------- Page No. 5
- OTHER FEATURES
- Low size instrument.
- True R.M.S. measuring mode.
- Recording of maximum and minimum value.
- Led for communication indication.
- Led for indication of recording process state (Store on/Store off)
- Capture of voltage sags and voltage dropouts.
- Measurement of harmonic distortion (THD or D).
- Measurement of Flicker.
3.- CAVA MODELS
Different CAVA models are available according to measured and recorded
parameters:
CAVA Model
Features
7 71 091 CAVA-251 Voltage Quality + Voltage
7 71 092 CAVA-252 Voltage Quality + Voltage + Current
7 71 093 CAVA -253 Voltage Quality + Voltage + Power
Voltage Quality involves detection of voltage sags and voltage dropouts, as
well as, harmonic distortion and flicker measurement.
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