INSTRUCTION MANUAL DIGITAL LOOP/PFC/PSC TESTER ＫＥＷ 4140
CONTENTS 1. 2. 3. 4. 5. Safe Testing ･･･････････････････････････････････････････ 1 Instruments Layout ･･････････････････････････････････････ 3 Accessories ････････････････････････････････････････････ 6 Features ･･･････････････････････････････････････････････ 7 Specification･ ･･････････････････････････････････････････ 8 5.1 Measurement Specification ･･････････････････････････ 8 5.2 Operating Error ･････････････････････････････････････ 9 5.3 General Specification ･･････････････････････････････10 5.
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 warning and safety rules which must be observed by the user to ensure safe operation of the instrument and retain it in safe condition. Therefore, read through these operating instructions before using the instrument.
# DANGER ● T his instrument is designed to work in distribution systems where the line to earth has a maximum voltage of 300V 50/60Hz and for some ranges where line to line has a maximum voltage of 500V 50/60Hz. Be sure to use it within this rated voltage. ● When conducting tests do not touch any exposed metalwork associated with the installation. Such metalwork may become live for the duration of the test.
2. Instrument Layout 1. Front View ④ ⑥⑤ ① ⑦ ⑧ ⑨ ⑩ ② ③ Fig.2-1 Name Operation ① Display(LCD) -- ② Test Switch Start measurements.
2. Input Terminal ① ② Fig.2-2 ① Terminal Names for : LOOP, VOLTS L : Line PE : Protective Earth N : Neutral (for LOOP) ② Terminal Name for L1 : Line1 PHASE ROTATION L2 : Line2 L3 : Line3 3. LCD Sub Display Main Display Fig.
List of Display Message Battery symbol Displayed when the measured values exceed the displayable range. (over-range) e.g. The display shows “>1999Ω” at a LOOP test when a test result exceeds 1999Ω. Displayed when “L-PE ATT ON” function is selected to indicate ATT is on. The LCD indicates “L-PE” when “L-PE ATT ON” or “ATT OFF” is selected and “L-N/L-L” when “L-N/L-L” is selected. Indicating what the values displayed on the Sub Display.
3. Accessories 1. Main Test Lead (Model 7218) Fig.3-1 2. Distribution Board Test Lead (Model 7246) Fig.3-2 3. Soft Case Model 9156…x1 4. Strap Belt Model 9155…x1 5.
4. Features The KEW4140 LOOP/PFC/PSC tester performs three function in one instrument. 1 Loop impedance tester 2 Voltage tester 3 Phase rotation tester The KEW4140 have the following features: ATT (Anti Trip Technology) ATT enables a measurement without tripping the RCDs with the rated residual current of 30mA or more. Wiring check Three Wiring symbols indicate if the wiring of the circuit under test is correct.
5. Specification 5.1 Measurement Specification Loop Impedance Rated Voltage Function (Operating Voltage) Guaranteed Voltage Range 230V(50／60Hz) ATT OFF (100∼280Ｖ) (45∼65 Hz) 230 V (+10%/-15%) (50/60 Hz)±1% L-PE L-PE LOOP: 20Ω: 0.00-19.99Ω 200Ω: 20.0-199.9Ω 2000Ω: 200-1999Ω PFC/PSC: 2000A：0-1999A 20kA：2.00-19.99kA Nominal Test Current at 0Ω External Loop: Magnitude/Duration (＊1) L-PE: 20Ω: 6A/20ms 200Ω: 2.
PHASE ROTATION Rated Voltage Remarks mark 50∼500V Correct phase sequence : displayed “1.2.3” and mark 45~65Hz Reversed phase sequence : displayed “3.2.1” and Volts Range Display Range 500V Volt：0 ∼ 525V Frequency：40.0 ∼ 70.0Hz Guaranteed Voltage Range 25 ∼ 500Vrms 45 ∼ 65Hz Accuracy Volt：±(2%rdg+4dgt) Frequency：±(0.5%rdg+2dgt) Possible number of tests with fresh alkaline batteries. LOOP/PFC/PSC :Approx. 3000 times min (ATT) VOLT/PHASE ROTATION :Approx. 100H. 5.
5.3 General specification Instrument dimensions 84 X 184 X 133mm Instrument weight:860g (including batteries.) Reference conditions Specifications are based on the following conditions except where otherwise stated:1. Ambient temperature: 23±5°C: 2. Relative humidity 45% to 75% 3. Position: horizontal 4. AC power source 230V, 50Hz 5. DC power source: 9.0 V 6. Altitude up to 2000m, Indoor use Battery type Six 1.5V AA batteries Use of alkaline batteries (LR6) is recommended.
6. Preparation for Measurement Check of Battery voltage (1)See “12. Battery replacement” and install batteries in KEW4140. (2) Press the Power switch on KEW4140 for at least 1 sec to power on the instrument. * P ower switch is activated only when the switch is pressed for 1 sec or more. Press the switch for at least 1 sec to power off the instrument. (3) Power on KEW4140 and check the Battery symbol displayed at the upper left on the LCD.
7. LOOP/ PSC/PFC Test 7.1 Principles of measurement of fault loop impedance and PFC If an electrical installation is protected by over-current protective devices including circuit breakers or fuses, the earth loop impedance should be measured. In the event of a fault the earth fault loop impedance should be low enough (and the prospective fault current high enough) to allow automatic disconnection of the electrical supply by the circuit protection device within a prescribed time interval.
According to the International Standard IEC 60364, for TT systems the characteristics of the protective device and the circuit resistance shall fulfill the following requirements: Ra x Ia ≤ 50V Where: Ra is the sum of the resistances in Ω of the local earth system and the protective conductor for the exposed conductive parts. 50 is the maximum safety touch voltage limit (it can be 25V in particular cases like construction sites, agricultural premises, etc.).
For this example the max permissible value is 1667Ω(RCD =30mA and contact voltage limit of 50 V). The instruments reads 12.74Ω, thus the condition RA ≤ 50/Ia is respected. However, considering that the RCD is essential for protection, it must be tested (Please refer to RCD TESTS section). TN System For TN systems the earth fault loop impedance is the sum of the following impedances. ● Impedance of the power transformer secondary winding.
- 400 ms for final circuits not exceeding 32A (at 230 / 400V AC) - 5 s for distribution circuits and circuits over 32A (at 230 / 400V AC) The compliance with the above rules shall be verified by: 1) Measurement of the fault loop impedance Zs by Loop tester. 2) Verification of the characteristics and/or the effectiveness of the associated protective device. This verification shall be made: - for circuit-breakers and fuses, by visual inspection (i.e.
Fig.7-4 Max value of Zs for this example is 1.44 Ω (MCB 16A, characteristic C), the Instrument reads 1.14 Ω (or 202 A on Fault current range) it means that the Condition Zs x Ia ≤ Uo is respected. In fact the Zs of 1.14 Ω is less than 1.44 Ω (or the Fault current of 202 A is more than Ia of 160A). In other words, in case of fault between phase and earth, the wall socket tested in This example is protected because the MCB will trip within the disconnection time required. 7.
Fig.7-5 7.3. Operating instructions for LOOP and PSC/PFC 7.3.1 Initial Checks: to be carried out before any testing 1. Preparation A lways inspect your test instrument and lead accessories for abnormality or damage: If abnormal conditions exist DO NOT PROCEED WITH TESTING. Have the instrument checked by your distributor. (1) Operate the Power switch and turn on the instrument. (Press the Power switch for at least 1 sec.) Press any of the following switches to select a function.
or symbol is indicated on the LCD, DO NOT PROCEED AS THERE IS INCORRECT WIRING. The cause of the fault must be investigated and rectified. 3. Voltage Measurement W hen the instrument is first connected to the system, it will display the line-earth Voltage (L-PE ATT ON /ATT OFF) or lineneutral voltage (L-N/L-L) which is updated every 1s. If this voltage is not normal or as expected, DO NOT PROCEED. 7.3.2 Measurement of LOOP and PSC/PFC a.
7.3.3 Contents displayed on Sub Display L OOP test results are displayed as illustrated below. Results displayed on the LCD are dependent on the selected function. Press the “DISP” Switch to toggle the test results displayed on the Sub Display. Sub Display Main Display Fig.
● M easured result may be influenced depending on the phase angle of the distribution system when making measurement near a transformer and the result may lower than the actual impedance value. Errors in measured result are as follows. System Phase Difference 10° 20° 30° Error (approx.) -1.5% -6% -13% Fig.7-8 Connection for using Outlet PE Fig.
Fig.7-10 Connection for Line – Neutral measurement Fig.
8. Phase Rotation Tests 1. Operate the Power switch and turn on the instrument. Press the PHASE ROTATION function switch . 2. Insert the Test Leads into the instrument. (Fig.8-1) Fig.8-1 3. Connect each test leads to a circuit. (Fig.8-2) L3 L2 L1 Fig8-2 4. Results are displayed as follows. Correct phase sequence Reversed phase sequence Fig.8-3 Fig.
9. Volts 1. Operate the Power switch and turn on the instrument. Press the VOLTS function switch . 2. Insert the Test Leads into the instrument. (Fig.9-1) Fig.9-1 3. Voltage value and frequency will be displayed on the LCD when applying AC voltage. Frequency Voltage Fig.9-2 10. Back Light Pressing the Back Light Switch selects Backlight ON / OFF. Backlight automatically turns off in 2 minutes after it turns on. 11. Auto-Test The Test Switch is locked when the switch is pressed down for 3 sec.
12. Battery Replacement # DANGER ● N ever open the battery compartment cover while making measurement. To avoid possible electrical shock, disconnect the test probe before opening the cover for battery replacement. # CAUTION ●Install batteries in correct polarity as marked inside. ● Do not mix batteries of different types or new batteries with used ones. , disconnect When the display shows the low battery indication, the test leads From the instrument. Remove the battery cover and the batteries.
13. Servicing If this tester should fail to operate correctly, return it to your distributor stating the exact nature of the fault. Before returning the instrument ensure that:1.The batteries are in good condition. 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.
14.Case and Strap Assembly 14-1 How to fasten the Strap belt (1) P ass the Side Belt through the Buckle as shown in Fig.14-1. (2 pcs) (2) A ttach the Side Belt to the instrument as shown in Fig.14-2. (both sides) Buckle ⇨ Side Belt Fig.14-1 (3) Attach the both ends of the Strap Belt to the Side Belt. (see Fig.14-3) ⇦ Fig.14-2 Length of the belt is adjustable by sliding this adjuster. Strap belt Fig.
14-2 How to store in Soft Case Follow the procedure (1) and (2) as illustrated below to store the instrument in the Soft Case. Instrument Partition (1) (2) Soft Case Fig14-4 (1) Pass the Belt attached to the instrument through the slot on the Soft Case and store the instrument in the Soft Case. (2) P ut a partition to be adjacent to the bottom face of the instrument.(Store the test leads in the partition.) Complete Test Lead Strap belt ⇩ Tie up the test Cord belt leads with the belt.
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DISTRIBUTOR Kyoritsu reserves the rights to change specifications or designs described in this manual without notice and without obligations.
