CAVA Series USER`S MANUAL
Contents
1. 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 771091 CAVA 251 Voltage Quality Voltage 771 092 CAVA 252 Voltage Quality Vol2. 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 acc 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 4 2 MAIN FEATURES
3. Supply measuring circuit Single phase 230 V c a Voltage tolerance 15 Frequency 50 60 Hz Burden 3 VA Current measurement according to ammeter clamp Accuracy class Voltage cete eere 0 5 or readout Current iin Qe eee 0 5 or readout FOWOLS 1 or readout Test conditions for accuracy determination Ammeter clamps not included Ambient temperature from 5 C to 45 C Dimensions 136 x 70 x 57 mm S8lely Category IIl as per EN 61010 Standards EN 60664 VDE 0110 UL 94 EN 60801 EN 50081 1 EN 61010 1 EN 50082 1 EN 60868 Analyzer of power supply quality CAVA 251 CAVA 252 CAVA 253 Page No 16 9 SAFETY CONSIDERATIONS The user should take into account all installation instructions referred in sections INSTALLATION AND START UP and SPECIFICATIONS of this manual Note that with the instrument powered on the terminals could be dangerous to touching and cover opening actions or elements removal may allow accessing dangerous parts 10 MAINTENANCE The CVM 96 does not require any special maintenance No adjustment maintenance or repairing action should be done over the instrument open and powered and should those actions are essential high qualified operators must perform them Before any adjustment replacement maintenance or repairing operation is carried out the instrument must be disconnected from any power sup
4. I nme dere pe He e der eg 9 5 22 tete eret eed eee ete dese e e 9 6 INSTALLATION AND STARTUBD tette ote iret e et eet tat e ete e ette tate 10 6 1 Installing the CAV Av iiit REIR ertet edente 10 6 2 CAVA connection procedure ue eer ete ee Ptr 11 7 OPERATION ttti te e 12 7 1 12 1 2 2 Setup procedure etre e pte vetere rp edere TEESI 13 8 SPECIEICATIQONS ect eter mete ones e etuer tat eee aval ones tive es 15 9 SAFETY CONSIDERATIONS dun dens Aes AR en de ides 16 10 5 MAINTENANCE ette rie acte Dna a Pe RS 16 11 TECHNICA D SERVIGE iere etate 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
5. m CIRCUTOR ANALYZER OF POWER SUPPLY QUALITY CAVA Series 251 252 253 USER S MANUAL M98120201 20 09A 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 BASIGINS TRUGTIONS 2 1 1 Check the contents of your package eeseeesccessesseeeecescecsseeceseecesaeecsseesaeecs ceaeessaeecsaeecseesseeesteeees caters 2 T 2 Safety conditiOns s uite teet t dtt temet 3 1 3 Connection instructions eiecti m eret cre 3 2 MAIN FEATURES greed ree dee bud e vetere levet tio pio 4 3 CAVA MODEES onhpRIUBIdeuinnIGmue UBI ennt 5 4 VARIABLES MEASURED AND RECORDED BY THE 6 4 1 Instantaneous variables measured and calculated sese 6 4 2 Parameters referred Power Supply Quality eese eene nren neret 7 7 42 2 Ol is C 7 4 2 3 VOltage sags eet tete ete ete ettet e t be bet rete ettet eue 8 4 2 4 Line interruptions inna ener enne enne enne nein meet nennen enne enne 8 4 2 5 Percentage of Voltage Quality sss eene nnne 8 5 DATA RECORDING IN MEMORY Automatic mode eese eren nennen nennen 9 5 T Data recording iuis aee este euo ed ee
6. the weighted Flicker value due to each frequency 2 RMS naa SFC 1 n Severity Pst From perceptivity values obtained and at the end of each period the analyzer calculates the severity Pst which gives a short term flicker measurement Severity Pst 0 0314P 0 0525P 0 0657P 0 28P 0 08P Where Poi Pi Ps Pio y Pao are coefficients that indicate the maximum perceptivity reached during the 0 196 196 396 1096 amp 5096 of the defined Pst period Perceptivity RMS _ FLICKER Analyzer of power supply quality CAVA 251 CAVA 252 CAVA 253 Page No 8 4 2 3 Voltage sags Voltage sags are defined as these cases where the R M S value of a voltage semicycle is lower a pre defined voltage value The CAVA will inform about the number of semicycles having a R M S value lower than the preset value that have been detected The CAVA will also provide the number of intervals these voltage sags have occurred within 4 2 4 Line interruptions The CAVA is also equipped with a counter to give the number of cycles within the last period where a voltage dropout has occurred The CAVA will also provide the number of intervals these voltage dropouts have occurred within Moreover the CAVA will save into an internal file all above mentioned events together with the type and occurrence time of each event 4 2 5 Percentage of Voltage Quality The CAVA provides a v
7. alue of the percentage of cycles presenting no event incidence nor voltage sag neither voltage dropout referred to the total of cycles within the set period No of cycles wih no event Voltage Quality x 100 Total of cycles in the period 5 DATA RECORDING IN MEMORY Automatic mode 5 1 Data recording Page No 9 The CAVA has an on board clock with date and time that permits to program the automatic data recording in memory at regular time intervals The size of each record will depend on the number of variables to be stored in CAVA 251 CAVA 252 CAVA 253 Electric parameters R M S Voltage Current x X Apparent power x Active power X Reactive power x Power Factor Frequency x x x Voltage sags No of cycles x x x Voltage dropouts Intervals x x x Line interruptions No of cycles x x x Power on off Intervals x x x Voltage Quality 96 cycles with no event x x x Flicker WA x X Pst x X X Harmonics THD maximum minimum and average values of the period are saved in memory 5 2 Event file The event file saves different types of incidences that might be of interest for the user Most relevant incidences are Power On Power Off Set up modification File deletion Analyzer of power supply quality CAVA 251 CAVA 252 CAVA 253 Page No 10 6 INSTALLATION AND STARTUP The manual you h
8. ctor This connector is used for the input of the ammeter clamp in models CAVA 252 amp 253 Since the model CAVA 251 does not measures current this connector is not used The primary of the ammeter clamp in use must be set During the installation process note that the current direction through the line must coincide with the arrow marked on the clamp otherwise no power value will be recorded by the CAVA 253 Hold Run led This led indicates several operation modes Whether the led is quickly blinking a reset action is being carried out Whether the led is blinking once per second the analyzer has detected the switch at the Run position and this is storing data into the internal memory Whether the led is always on and is not blinking the analyzer has detected the switch at the Hold position and no data is being stored into the internal memory Communications led This led must be on while the analyzer is communicating with the P C Hold Run switch The position of this switch is only considered when powering up the analyzer If at this moment the switch is at Run the analyzer will record data into the internal memory otherwise if the switch is at Hold no data will be stored into the internal memory RS 232 Connector for the communication and data downloading to a P C Analyzer of power supply quality CAVA 251 CAVA 252 CAVA 253 Page No 12 7 OPERATION MODE Before conn
9. ecting the analyzer to a single phase power system in order to record data or to transfer data to a P C check the Hold Run switch to be at the right position The position of this switch is only considered when powering up the analyzer No later modification of the switch position will be effective once the analyzer is already running It is advisable to observe the Hold Run led to check that the analyzer is at the right operation mode according to our requirements See section 6 2 The position of this switch is only considered when powering up the analyzer 7 1 Communications Setup procedure and data retrieval can only be performed through the RS 232 serial port in the CAVA therefore the configuration of the serial port of the PC and the CAVA must entirely coincide The default configuration of the CAVA serial port is Peripheral 00 Communication parameters 9 600 7 N 1 The CAVA only permits to modify the baud rate Available baud rates are 2400 4800 9600 amp 19200 bauds When setting the data management software for the CAVA in the PC the serial port used to communicate to the CAVA Com 1 Com 2 must be correctly defined The software will automatically check at different baud rates whether a CAVA is connected to the set port Analyzer of power supply quality CAVA 251 CAVA 252 CAVA 253 Page No 13 7 2 Setup procedure A correct operation of the CAVA will depend on a r
10. ight setup and connection actions Parameters to be user programmed through the appropriate PC software are following ones Time Time of the on board analyzer clock A right set is important to get correct information about the time that difference incidences occurred Communications To modify the baud rate when communicating to the P C Rated voltage The rated voltage of the single phase power system to be monitored by the CAVA This point is very important since determine limits for the analysis of power supply quality Time constant for voltage measurement seg The CAVA is set by default to provide the average value of the voltage for a period of one second If required this integration time can be modified just setting at this option the desired period is seconds Voltage threshold For some application it is not effective to monitor the maximum minimum absolute value of the voltage but to record the percentage related to the whole period x of the period that a maximum value has been exceeded or that a minimum value has not been exceeded If the maximum voltage value of reference is desired to be the absolute one then the value 096 must be set Quality threshold of the rated voltage The analyzer counts the number of cycles whose R M S value is within these limits According to the number of right cycles the CAVA will give the percentage of voltage quality Voltage sag and dropout threshold of the rated voltage Ever
11. old 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 Whether the instrument is not used according to manufacturer s specifications the protection of the instrument can be damaged When any protection failure is suspected to exist or external damages are observed the instrument must be immediately put out of service Contact then with a qualified service representative 6 1 Installing the CAVA Before powering and connecting the analyzer check the following points a Supply measuring voltage Single phase voltage 230 V a c 15 26 Frequency 50 60 Hz Burden 3VA b Maximum measurable current according to the ammeter clamp used c Working conditions Operation temperature 0 to 50 C Operation humidity 25 to 80 RH e Safety Designed to meet class as per EN 61010 Note that with the instrument powered on cover opening or elements removal actions may allow accessing dangerous parts Page No 11 3 Hold Run led 5 Hold Run switch 6 RS 232 Supply Measurement Voltage measurement is done from the own instrument s supply Check that the monitored power system is within allowable voltage limits of the analyzer Clamp conne
12. ply source When any protection failure is suspected to exist the instrument must be immediately put our of service 11 TECHNICAL SERVICE For any inquiry about the instrument performance or whether any failure happens contact to CIRCUTOR s technical service CIRCUTOR S A After sales service Vial Sant Jordi s n 08232 Viladecavalls Spain Tel 34 93 745 29 00 amp fax 34 93 745 29 14 E mail central circutor es
13. tage Current 771 099 CAVA 253 Voltage Quality Voltage Power Voltage Quality involves detection of voltage sags and voltage dropouts as well as harmonic distortion and flicker measurement 4 Analyzer of power supply quality CAVA 251 CAVA 252 CAVA 253 Page No 6 VARIABLES MEASURED AND RECORDED BY THE CAVA 4 1 Instantaneous variables measured and calculated VOLTAGE RMS value Vn Vrms Vrms gt t uy CURRENT RMS value CAVA 252 amp CAVA 253 1 2 1 N yd In Ims 4 Ji t dt Ims J i ACTIVE POWER CAVA 253 1 1 N Pn zf u t x t dt gt Pera u i POWER FACTOR of each phase PF1 PF2 amp PF3 Pn Irms Urms REACTIVE POWER Inductive and capacitive CAVA 253 Value measured from the current signal 90 shifted with respect to voltage signal Qn Xf ult FREQUENCY Hz Analyzer of power supply quality CAVA 251 CAVA 252 CAVA 253 Page No 7 4 2 Parameters referred Power Supply Quality 4 2 1 Harmonics The CAVA provides the measurement of the harmonic distortion of the voltage wave This distortion can be referred either to the fundamental amplitude D or to the RMS value of the signal THD 4 2 2 Flicker The CAVA measures and records both the flicker WA and the severity Pst RMS Flicker WA Value of the Flicker RMS that is defined as the average result of
14. y cycle whose R M S value is below this limit is stated to be voltage sag or dropout Analyzer of power supply quality CAVA 251 CAVA 252 CAVA 253 Page No 14 Primary of the current transformer CAVA 252 amp CAVA 253 The primary of the ammeter clamp used for measuring must be set to obtain proper measured values Time constant for current measurement CAVA 252 y CAVA 253 The CAVA is set by default to provide the average value of the current for a period of one second If required this integration time can be modified just setting at this option the desired period is seconds Rated frequency The rated frequency of the monitored power system must be set to obtain right data when measuring instantaneous values Time constant for frequency measurement CAVA 252 amp CAVA 253 The CAVA is set by default to provide the average value of the frequency for a period of one second If required this integration time can be modified just setting at this option the desired period is seconds THD D Set here the distortion value measuring method 96D distortion referred to the fundamental value THD gt Harmonic distortion referred to the R M S value Period Integration period for data recording in memory Campaign This option enables to set different measurements into the same file Analyzer of power supply quality CAVA 251 CAVA 252 CAVA 253 Page No 15 8 SPECIFICATIONS
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