MODEL 4116A, 4118A, 4120A
Contents
1. KYORITSUKEIKI TOKYO URL http www kew Itd co jp E mail info kew ltd co jp Factories Uwajima amp Ehime2. ranges the fault voltage may become high and dangerous due to the D LOK current therefore the unit is designed to lock out PSC ranges showing Uf Hi symbol Normally PSC tests are conducted at point of origin e g distribution boards between phase and neutral When conducting PSC tests at socket outlets a test will be conducted between phase and earth due to the fixed wiring of the moulded mains plug N WARNING Q This instrument is intended only for use in single phase operation at 230V 10 15 AC phase to earth or for use in OLD TT system phase to neutral 6 DETAILED EXPLANATION 6 1 Measurement of Fault Loop Impedance and Prospective Fault Current If the electrical installations are protected by over current protection devices or by fuses the Fault loop impedance should be measured In the event of a fault the Fault loop impedance should be low enough and the Prospective Fault current higher enough in order to have the automatic disconnection of supply by the installed protection device within prescribed time interval Every circuit must be tested to make sure that the fault loop impedance does not exceed that specified for the over current protection device concerned For TT system the Fault loop impedance is the sum of the following partial impedances e Impedance of power transformer s secondary e Phase conductor resistance from power transformer to fault location e Protection conductor resistance from
3. the _ Safety barriers on the test leads Q Be sure to remove the test lead from the mains power supply promptly after measurement Do not leave the instrument connected to the mains power supply for a long time N WARNING Q Never open the instrument case there are dangerous voltages present If a fault develops return the instrument to your distributor for inspection and repair if the overheat symbol appears in the display Eg disconnect the instrument from the mains supply and allow to cool down if abnormal conditions of any sort are noted such as a faulty display unexpected readings broken case cracked test leads etc do not use the tester and return it to your distributor for repair Q Never attempt to use the instrument if the instrument or your hand is wet 4118A all RCD s RCCB ELCB in the circuit must be by passed for the duration of the test except loop 2000 Q range _ Do not operate the RCD Test Button with the RCD by passed Q During testing it is possible that there may be a momentary degradation of the reading due to the presence of excessive transients or discharges on the electrical system under test Should this be observed the test must be repeated to obtain a correct reading If in doubt contact your distributor Use a damp cloth and detergent for cleaning the instrument Do not use abrasives or solvents 2 2 PROCEDURE OF REMOVING COVER M
4. 1667 500 167 100 50 RA at 25V 2500 833 250 83 50 25 Note The loop tester models 4120A 4118A 4116A measure the fault loop impedance that is a value normally a little bit higher of RA But if the electrical installation is protected considering the loop impedance value also the RA formula will be fulfilled Practical example of verification of the protection in a TT system according to the international Standard IEC 60364 i RCD 30mA C For this example max value is 16670 the loop tester reads 12 740 it means that the condition RA lt 50 la is respected It is fundamental for this example to test also the RCD to ensure that operation takes place quickly enough to respect the safety requirements In order to do it can be used the RCD tester model 5406A According to the international Standard IEC 60364 for TN system the following condition shall be fulfilled for each circuit Zs lt Uolla Where e Zs is the Fault loop impedance e Uo is the nominal voltage between phase to earth e la is the current causing the automatic disconnection of the protective device within the time stated in table as follows Uo Volts T seconds Note For a distribution circuit a disconnection time not exceeding 5s is permitted When the protection device is a residual current device RCD la is the rated residual operating current An For instance in a TN system wit
5. INSTRUCTION MANUAL DIGITAL PSC LOOP TESTER MODEL 4116A 4118A 4120A KYORITSU ELECTRICAL INSTRUMENTS WORKS LTD CONTENTS 1 2 PROCEDURE OF REMOVING COVER 3 SOBEATUBHES E EE 4 SNMP sU RR 4 ee We cd E 5 oM I II MEC EE 5 4 SPECIFICATIONS 7 5 OPERATING INSTRUCTIONS 8 5 1 Initial CHECKS 8 5 2 Measurement of the Loop Impedance 9 5 3 Measurement of Prospective Short Circuit Current 10 6 DETAILED EXPLANATION 10 6 1 Measurement of Fault Loop Impedance and Prospective Fault Current 10 6 2 Measurement of OLD TT System 15 6 3 Measurement of Line Impedance and Prospective Short Circuit Current 16 uelc 17 8 CASE AND STRAP BELT ASSEMBLY irati crenasiezmutents 17 1 SAFE TESTING Electricity is dangerous and can cause injury and death Always treat it with the greatest of respect and care If you are not quite sure how to proceed stop and take advice from a qualified person This instruction manual contains warnings and safety rules which must be observed by the user to ensure safe opera
6. K operates is as shown in the table below Range D LOK Operating Voltage Loop200 Q PSC200A 190 253V Loop20 Q PSC2000A 20kA 205 253V 3 3 2 Applied Standards Instrument operation IEC EN 61557 1 IEC61557 3 Safety IEC EN 61010 1 CAT III 300V instrument IEC EN 61010 2 31 CAT III 300V test lead Protection degree IEC60529 IP 54 5 3 3 3 Model 4116A 4118A and 4120A have the following features Battery is not used Wiring check Over temperature protection Overload protection D LOK circuit 15mA Loop measurement Display All models are not battery operated but operate by the voltage supplied from the system Three LEDs indicate if the wiring of the circuit under test is correct The P E and P N LEDs illuminate when the wiring polarity of the circuit under test is correct Reverse LED is lit when and are reversed Detects overheating of the internal resistor displaying a warning symbol Eg and automatically halting further measurements Halts measurement to prevent damages to the body when voltage between VL PE is 260V or more VL PE Hi is shown on the display Model 4120A with unique D LOK circuit avoids the need to by pass most RCD s Loop impedance 20000 range measurement is carried out with low test current 15mA The current will not cause tripping out involved RCD even the one with the lowest nominal differential current 30mA The
7. ate units A bleep will sound on completion of the test For best results always test on the lowest possible range For example a loop impedance measured on the 2000 range may give an indication of 0 3 whereas on the 200 range it may read 0 28 In the event of the reading being in excess of the range e g more than 200 on the 200 range the appropriate over range symbol OL will appear on the display No harm will be done to the instrument by selecting too low a range 9 5 3 Measurement of Prospective Short Circuit Current Models 4118A and 4120A 1 Set the instrument to the 20kA range 2 Connect the test lead to the instrument 3 Attach the plug to the socket to be tested 4 Check that the LED s are lit in the sequence indicated in section 5 1 If not disconnect from the mains and check the wiring at the socket 5 Press the Press to Test button The prospective short circuit current PSC will be directly displayed on the LCD with the appropriate units This will remain for 3s and then revert to AC voltage display An audible beep will sound on completion of the test For best results always test on the lowest possible range For example a PSC measured on the 2000A range may read 60A whilst on the 200A range it may read 56 0A To hold the reading keep the button held down or turn clockwise to lock for Auto Test Note For loop impedance greater than 2100 PSC 200A range and 25 Q on 2000A 20kA
8. fault location to local earth system e Resistance of local earth system H e Resistance of power transformer s earth system Ro The figure below shows in marked line the Fault loop impedance for TT system L1 L2 L3 rr Dm m mm omm m m UR mal Dm m 1 Ro m mmm I I I I I I I 1 I I I I I I I L I I I I A I I I I I I I For TN system the Fault loop impedance is the sum of the following partial impedances e Impedance of power transformer s secondary e Phase conductor resistance from power transformer to fault location e Protection conductor resistance from fault location to power transformer The figure below shows in marked line the Fault loop impedance for TN system According to the international Standard IEC 60364 for TT system the following condition shall be fulfilled for each circuit RA lt 50 la Where e RA is the sum of the resistances of the local earth system and protection conductor connecting it to the exposed conductive part 50 is the max contact voltage limit it could be 25V in particular cases e la is the current causing the automatic disconnection of the protective device within 5 s When the protection device is a residual current device RCD la is the rated residual operating current Z n For instance in a TT system protected by a RCD the max RA values are 1000 at 50V 5000
9. h nominal mains voltage Uo 230 V protected by gG fuses the la and max Zs values could be Rating Disconnecting time 5s Disconnecting time 0 4s A 6 10 16 20 25 32 40 50 63 80 0 54 840 100 0 39 1020 0 22 Using the current ranges on models 4120A and 4118A can be also tested the Prospective Fault current Prospective Fault current measured by instruments must be higher than la of the protective device concerned Practical example of verification of the protection in a TN system according to the international Standard IEC 60364 p use gG 16A L1 Max value of Zs for this example is 2 1 Q 16A gG fuse 0 45 the loop tester reads 1 14Q or 202 A on Fault current range it means that the condition Zs Uolla is respected In fact the Zs of 1 14Q is less than 2 1Q or the Fault current of 202 A is more than la of 110A Z WARNING This instrument is intended only for use in single phase operation at 230V 10 15 AC phase to earth or for use in OLD TT system phase to neutral If the overheat symbol appears in the display KA disconnect the instrument from the mains supply and allow to cool down 6 2 Measurement of OLD TT System OLD TT system is a TT system with phase to phase voltage of 220 V instead of 400 V and phase to earth of 127 V instead of 230V and normally the neutral conductor is not used Connecting the loop testers to t
10. his system all three wiring check LEDs should be lit and the display reads a value of 127 V Only if all these conditions are respected the test can be carry out U Rs D A F i Z WARNING OLD TT system only DO NOT PRESS the Test button if the display reads a value of 220V The RCD could trip during the tests also with model 4120A CAUTION The D LOK circuit of 4120A can not works with 127V between phase to earth 6 3 Measurement of Line Impedance and Prospective Short Circuit Current Line Impedance on single phase system is the impedance measured between phase and neutral terminals Measurement principle used inside the instrument is exactly the same as at Fault Loop Impedance measurement but the measurement is carried out between L and N terminals Breaking current capacity of installed over current protection devices should be higher than Prospective Short Circuit current otherwise it is necessary to change the rated current of involved over current protection device Practical example of line impedance test and prospective short circuit current test only for models 4120A and 41184 The figure below shows in marked line the Line impedance phase to neutral for TN system Z WARNING This instrument is intended only for use in single phase operation at 230V 10 15 AC phase to earth or for
11. liquid crystal display has 3 1 2 digits with a decimal point and units of measurement Q A V Manual and Autotest mode Manual Press and release the Press to Test button The result will be displayed for 3s and then the display will revert to AC voltage Autotest The Press to Test button can be turned clockwise to lock it down In this auto mode when using distribution board lead M 7121 tests are conducted by simply disconnecting and reconnecting the red phase prod of the M 7121 avoiding the need to physically press the test button i e hands free CAUTION The D LOK circuits may not by pass some RCD s and this will result in the RCD tripping out as they would do with a conventional loop tester Also in the case of high sensitivity RCD s rated at 10mA or less the D LOK circuits may not function 4 SPECIFICATIONS Measurement Specification Loop Impedance IEC61557 3 Nominal test current Range Measuring range at 00 external loop Accuracy 20Q 0 00 19 99Q 25A 20ms 2000 0 0 199 90 2 3A 40ms 29erdg 4dgt 20000 Prospective Short circuit Current M 4118A M 4120A Accuracy Consider accuracy of Loop Impedance Instrument dimensions Instrument weight Reference conditions Operating temperature and humidity Storage temperature and humidity Symbols used on the instrument Range Measuring range 200 0 0 199 9 2 3A 40
12. ms 2000A 0 1999A 25 20ms 20kA 0 00 4 00kA 25A 20ms Voltage Measuring range Accuracy 110 260V 2 rdg 4dgt 186X167 89 4120 960g M 4116A and M 4118A 750g Specifications are based on the following conditions except where otherwise stated 1 Ambient temperature 23 5 2 Relative humidity 45 to 75 3 Position horizontal 4 AC power source 230V 50Hz 5 Altitude Up to 2000m 0 to 40C relative humidity 80 or less no condensation 20 to 60 C relative humidity 75 or less no condensation n Equipment protected throughout by DOUBLE INSULATION or REINFORCED INSULATION A Caution refer to accompanying instruction manual 7 Operating Error of Loop Impedance 61557 3 Measuring range to keep Maximum percentage operating error operating error 0 20 19 990 20 0 199 90 30 200 19990 The influencing variations used for calculating the operating error are denoted as follows Temperature 0 C and 40 C Phase angle At a phase angle 0 to 18 System frequency 49 5Hz to 50 5Hz System voltage 230V 10 15 5 OPERATING INSTRUCTIONS 5 1 Initial Checks To be carried out before any testing 1 Test Lead Connection Insert the lead plug into the connector on the instrument correctly as shown below Fig 5 N CAUTION Q Always inspect your test instrument and lead accessories for abnormality or damage If abnormal conditions exis
13. odel 4116A 4118A and 4120A have a dedicated cover to protect against an impact from the outside and prevent the operation part the LCD and the connector socket from becoming dirty The cover can be detached and put on the back side of the main body during measurement 2 1 Method of removing the cover Fig 1 Fig 2 3 3 FEATURES 3 1 Instrument Layout IT SU y Wiring correct Reversed L N terminals Red LED oas sov 23012105 50Hz LCD Connector Fig 3 LCD display c Wiring check LEDs m Test button d sucus Range switch c REND Connector N DANGER Use original test lead only Max allowed voltage between mains test terminals and ground is 300V Q This instrument is intended only for use in single phase operation at 230V 10 15 AC phase to earth or for use in OLD TT system phase to neutral 3 2 Test Lead The instrument is supplied with Model 7125 lead at socket outlets and Model 7121 distribution board lead 1 Model 7125 Black Neutral Red Phase n Green Earth 3 3 Features 3 3 1 Test Range Function Model 4120 M 4118A 4116 D LOK Circuit x x Loop 0 19 99Q 0 199 9 Q 0 1999 0 O O O PSC 0 199 9A 0 1999A 0 4 00kA O O x Note D LOK Automatic device RCD lock D LOK dose not operate on the Loop 2000 Q Mains voltage with which D LO
14. t DO NOT PROCEED WITH TESTING 2 Wiring Check Before pressing the Test Button always check the LED s for the following sequence P E Green LED must be ON P N Green LED must be ON t Red LED must be OFF N WARNING the above sequence is NOT displayed or the RED LED is on for any reason DO NOT PROCEED AS THERE IS INCORRECT WIRING The cause of the fault must be investigated and rectified 3 Voltage Measurement When the instrument is first connected to the system it will display the phase neutral voltage which is updated every 1s This mode is cancelled whenever the test button is pressed If this voltage is not normal or as expected DO NOT PROCEED N WARNING Q This instrument is intended only for use in single phase operation at 230V 10 15 AC phase to earth or for use in OLD TT system phase to neutral 5 2 Measurement of the Loop Impedance 1 Set the instrument to the 2000 or 20000 range If the instrument is set to the 200 range slight sparking may occur when testing with the distribution board lead although the unit has been designed to minimize this 2 Connect the lead to the instrument 3 Plug the moulded mains plug to the socket being tested 4 Check the LED s are lit as indicated in section 5 1 If not DO NOT PROCEED check wiring 5 Note the mains voltage if required 6 Press the Press to Test button The value of loop impedance will be displayed with the appropri
15. tion of the instrument and retain it in safe condition Therefore read through these operating instructions before using the instrument IMPORTANT 1 This instrument must only be used by a competent and trained person and operated in strict accordance with the instructions KYORITSU will not accept liability for any damage or injury caused by misuse or non compliance with the instructions or with the safety procedures 2 It is essential to read and to understand the safety rules contained in the instructions or with the safety procedures 3 The symbol indicated on the instrument means that the user must refer to the related sections in the manual for safe operation of the instrument Be sure to carefully read instructions following each symbol in this manual N DANGER is reserved for conditions and actions that are likely to cause serious or fatal injury NWARNING is reserved for conditions and actions that can cause serious or fatal injury CAUTION is reserved for conditions and actions that can cause a minor injury or instrument damage DANGER _ This instrument is intended only for use in single phase operation at 230V 10 15 AC phase to earth or for use in OLD TT System phase to neutral When conducting tests do not touch any exposed metalwork associated with the installation Such metalwork may become live for the duration of the test When testing always be sure to keep your fingers behind
16. use in OLD TT system phase to neutral lf the overheat symbol appears in the display Ed disconnect the instrument from the mains supply and allow to cool down When testing installation that has a large current capacity such as a power line be sure not to short live conductors with the tip of a probe Failure to follow these instruction can cause hazards to the user 7 SERVICING If this tester should fail to operate correctly return it to your distributor stating the exact nature of the fault Please remember to give all the information possible concerning the nature of the fault as this will mean that the instrument will be serviced and returned to you more quickly 8 CASE AND STRAP BELT ASSEMBLY Correct assembly is shown in Fig 12 By hanging the instrument round the neck both hands will be left free for testing Pass the strap belt down through the side panel of the Pass the strap through the main body from the top and up A buckle adjust the strap for through the slots of the probe Fig 12 length and secure case from the bottom DISTRIBUTOR 92 1483 01 05 Kyoritsu reserves the rights to change specifications or designs described in this manual without notice and without obligations KYORITSU ELECTRICAL INSTRUMENTS WORKS LTD No 5 20 Nakane 2 chome Meguro ku Tokyo 152 0031 Japan Phone 03 3723 0131 Telex 0246 6703 Fax 03 3723 0152 Cable Address
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