KTD50 Digital RCD Tester User Manual
Contents
1. at twice the current rating selected x 2 ie At the 30mA setting a 60mA test current will be used The x 2 setting is accessed by pressing the SELECT TEST button until the multiplier cycles past the ramp test and the x 1 symbol flashes When the test result is displayed the multiplier will show as x 1 continuously lit regardless of whether the test was conducted at x 1 or x 2 6b Ramp test The SELECT TEST button is also used to access the Ramp test function This is a particularly useful diagnostic function that enables the fault current applied to be started at just 3mA and raised automatically in small increments By doing this you can determine the amount of extra leakage it is necessary to introduce into a circuit to trip the breaker The result displayed unlike all of the other tests will be the current rather than the time taken to open the RCD 7 TEST POLARITY BUTTON In manual mode this toggles between 0 phase angle and 180 phase angle 8 AUTO BUTTON The KTD50 defaults to manual operation upon powering on and in this mode you control he test with the selections made in step 5 Type Rating step 6 Multiplier amp step 7 polarity A single press of the test button will now initiate the test and display the result This is fine for occasional testing but a full test of each RCD will involve six separate ests for a 30mA breaker Comprising testing at its rated current lAn at 5 x lAn and at Y x lAn with each2. test being conducted at both 0 and 180 Four of these six ests should require the RCD to be reset this is where the AUTO test function will save ime and effort To use the AUTO function follow the above through to step 5 and select the RCD rating and type Then instead of selecting the multiplier at step 6 simply press the AUTO button Confirmation of auto mode is given in the display window see F page 5 A single press of the test button will now automatically select the appropriate multiplier and polarity for each test and run the full test sequence for you all you have to do is reset the breaker each time it trips As soon as the RCD is reset the tester recognises that power has been restored and automatically conducts the next test in the sequence Upon returning to the tester pressing the recall button displays the results in sequence of each test conducted The LCD screen changes to show which test the result refers to and an audible tone is given to alert you of any failures The same procedure is used for RCDs with a rating higher than 30mA but the two tests at 5 x the rated current are not required for these Example for a 30mA RCD Select 30mA by pressing the RCD IAN TYPE button until 30mA is displayed Press AUTO button the display should now show x 1 30mA AUTO as well as the voltage Press test button 9 A 30mA test will be carried out and the result displayed As soon as the breaker is reset the displa
3. x 2 x 5 test currents Socket Wiring 100mA 300mA 500mA breakers x Ya x 1 test currents 3 Unlimited number of RCD tests 1 Correct N E SL oo Continuous RCD test polarity change 2 LE reverse N L 13 et Warble Auto Manual test on all breakers Full socket test and mains polarity test 3 L NE miswire a Eo eo Warble Complies with EN61557 parts 1 and 6 performance 4 TS L E N ws Warble Complies with EN61010 safety Complies with EN61326 EMC 5 LNE miswire LN Be eve Warble RCD Test Range to EN61557 6 6 FaultyN L E miswire e e Warble Supply voltage PI AIV AC 30M7 7 Faulty N E miswire Je es Warble Test current accurac Ya 1 0 to 10 Y y 8 Faulty N VETE Warble Test current accuracy I 5 0 to 10 A mp 9 Faulty N LE reverse MAA E oo Warble Trip time accuracy Up to 1 second 1 1ms Over 1 second 1 10ms 10 Faulty E L N reverse L NC N eve Warble Voltage measurement 11 Faulty E N NC L e Warble Range 5V to 440V 2 1V over the working frequency range of 50Hz 0 5 gt Sochotiast 12 Faulty E N miswire E NC L oo Warble mE opens shorts wrong wiring phantom conditions phase reversal out of limits 13 Faulty E LN miswire L E ee Warble voltage Fault Touch Voltage 14 Faulty L N E miswire L NC ee Warble a terminated 2208 15 FaultyL Emiswire Ay nc e Warble ower 4 x AA batteries Alkaline recommended 16 Faulty L NE miswire E NC eve Warble Battery life 10 000 tests ee e Fitted fuse 32mm 0 25
4. A F HBC 17 Faulty N miswire i NC ee Warble Survives 440V over voltage test rated for 1 minute 18 Nomaini NC e None Environmental Operating Temperature Range 0 C to 40 C Above is the indication given when touching the touch pad Storage Temperature Range 10 C to 60 C LEDs will flash to indicate fault condition NC no connection Operating Humidity 93 RH 40 C Size 157mm x 89mm x 39mm Weight 400g Kewtech Corporation Limited Midas House Unit 2b Stones Courtyard High Street Chesham Bucks HP5 1DE T 01494 792 212 F 01494 791 826 E sales kewtechcorp com www kewtechcorp com
5. KEW TECH KTD50 Digital RCD Tester User Manual Tests RCDs mains voltage and polarity www kewtechcorp com The Kewtech KTD50 Loop Impedence Tester is designed for use by suitably qualified personnel familiar with electrical supply systems A Caution We strongly advise reading and understanding this guide before the instrument is used In particular note the safety issues that follow e Although fully protected up to 600V AC this tester is for use on 230V AC circuits only e Always check the tester on a known correctly wired live socket outlet before and after use e Before use check your tester for any damage to the plug lead and cabinet C Bs EN 61010 1 At Kewtech our engineers constantly look for improvement If there is any aspect of your Kewtech tester you would like to comment on please visit our website at Kewtechcorp com Operation Overview Your Kewtech tester has a special polarity test function Itis a little known fact that a system can be reverse wired with Live Phase to earth neutral and earth neutral to Live Phase The sockets will all work and conventional loop testers will show and test that everything is correct despite this very dangerous wiring condition Although extremely rare this miswire condition can exist so if your test shows this fault do not proceed if in any doubt advise your customer to contact their supply company immediately CORRECT POLARITY Typical supply s
6. e supply polarity has been reversed the three LEDs will turn red and flash If this happens stop testing and notify the supply company immediately RCD TYPE SELECTION BUTTON This selects the type and rating of RCD to be tested 30mA 100mA 300mA or 500mA rated type AC general purpose RCDs and 100mA or 300mA rated type ACS Selective SELECT TEST BUTTON 6a Current multiplier This button is used to select the test current multiplier that is applied to the selected rating of RCD type chosen in step 5 for the test to be carried out For example if the 30mA rating was selected in step 5 choosing x Y here would apply a test current of 15mA Y x 30mA when the test is conducted Choosing x 5 here would apply a test current of 150mA 5 x 30mA The multipliers available are x Ya x 1 x 2 and 5 for 30mA and 100mA AC type RCDs x Ya and x 1 for 300mA amp 500mA type AC RCDs and 100mA amp 300mA type ACS RCDs Additionally the Ramp test function see below is available for all but the 500mA setting Important note You will see above that the x 2 multiplier is available for use with the 30mA or 100mA type AC setting Where available its selection is indicated in the display by the x 1 symbol flashing If when selecting the test to be carried out the x 1 symbol shows continuously lit then the test will be conducted at the current rating selected at step 5 x 1 If the x 1 symbol is flashing the test will be conducted
7. ervice cut out fuse From supply UNE phase company LINE Phase to meter Neutral to meter To main earthing terminal Solid brass connecting block A REVERSE POLARITY Typical supply service cut out fuse From supply NEUTRAL company Neutral to meter LINE Phase to meter To main earthing terminal Solid brass connecting block Operation a Detailed View of the KTD50 Note Numbers also indicate sequence of test 2 Three LEDs show socket wiring status 3 Correct mains voltage indicated 1 On Off button 5 Selects RCD rating 30mA 100mA 300mA 500mA 6 Selects test to be applied xl x2 x5 xy Ramp 7 Selects phase 8 Manual or 4 Polarity Test 9 Push to test angle The test auto test will start from sequence As 0 or 180 Overview of the Display aQanwnD D E 0T rA eT Battery condition Eb good Indicates RCD rating selected IAn 30mA or 100mA This is the test multiplier selected e g for a 30mA RCD test will be made at 15mA 30mA and 150mA Phase angle test will start from Ce 5 0 positive YA 180 negative Shows Auto Test sequence has been selected Indicates the type of RCD being tested AC standard general purpose RCD AC Volts Seconds Milliseconds thousandths of a second lt Less than gt Greater than RCD Testing 1 ON OFF Pressing and releasing this button turns the KTD50 on and off intellige
8. nt Auto Power Off is also incorporated When the KTD50 is first connected to a live socket it will automatically test the socket wiring to establish that the circuit wires have been connected to the correct terminals on the back of the socket If all three LEDs light green and no sound is emitted the wiring status is correct and you can proceed to the incoming supply polarity test step 3 A fault with the socket wiring will be indicated by an audible alternating tone and the LEDs at least one of which will be red or orange will flash If a fault indication is given DO NOT PROCEED investigation and remedial action is required before you can conduct an RCD test If this happens placing your thumb on the polarity test pad will now activate the fault location function With your thumb on the pad check the indication given by the LEDs against the chart on the back cover to identify where the main problem lies Note The colour of the LEDs may change when the pad is touched Check that the mains voltage is in the correct range 207 253V AC Note All tests are inhibited until the mains voltage appears in the display Incoming supply Polarity Test this important test is discussed in full on page 3 of this manual please read To conduct the test with all three LEDs lit green place your thumb on the polarity test pad area If the supply polarity is correct the LEDs will start to flash green and you can proceed to step 5 If th
9. y will change from S to indicate that the next test will be at 180 phase angle the test will automatically be conducted and the result displayed As soon as the breaker is reset the display will change from 2 to S gt and from x 1 to x 5 to indicate that the next test will be at 0 phase angle at 150mA 5 x 30mA The test will automatically be conducted and the result displayed As soon as the breaker is reset the display will change from lt 5 to to indicate that the next test will be at 180 phase angle the test will automatically be conducted and the result displayed When the breaker is reset the display will change from x 5 to x Y and from to So to indicate that the next test will be at 15mA Y x 30mA and at 0 phase angle and the test will run The display should now show gt 2 00s to indicate that the RCD did not trip within 2 seconds when tested at Y of its rated current The tester will automatically repeat this test at 180 phase angle and if all is well will display the same gt 2 00s reading The auto test sequence is now complete and the results can be recalled by using the recall button Specifications Condition Wiring condition Supply terminal LED display Buzzer number Features Type AC amp ACS breakers N E L 30mA breakers x Ya x 1
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