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MFT1700 series Multifunction testers User manual

1. Reverse Polarity warning The 3rd test lead can be connected to Neutral L3 but is not used in the 2Hi Phase Earth measurement However the MFT will show a Phase Neutral reversed connection if present A warning is displayed if there are any disturbances to the circuit under test during the test sequence The display will show the symbol The loop impedance reading may have been compromised by the circuit interference Repeat the test 7 2 2 Zs and Zdb loop measurements without RCD eg Zs Zdb etc 1 Set the LEFT rotary range knob to the range 2 On the MFT1720 and MFT1730 set the RIGHT rotary knob to z M x 1kV RCL snp TRUE RMS MFT1710 MFT1720 and MFT1730 16 23 Connect test leads as below with the Red test lead connected to the L1 Red terminal on the MFT and the Green test lead connected to the Green L2 terminal UL 50 V AIM lt gt D LI v 25 Press TEST to start the test sequence This can be automated in SETUP so the test starts when contacting the Circuit See section 10 Setup 6 On completion of the test the display will show the loop resistance on the large display segments and the fault current on the small display segments 7 2 3 Earth Loop measurements with an RCD in circuit Loop testing L N through and RCD will not trip it using the 2Hi test mode However testing Phase to Earth requires a test that draws less current and help prevent the RCD tripping
2. Current via Clamp meter Intrinsic accuracy 5 0 3 digits Resolution 0 1 mA EN61557 Range 0 5 mA 199A Max service error 10 2 digits mV Sensor input 1730 including temperature third party module 1 096 2 digits Range 0 0 mV to 199 9 mV dc Resolution 0 1 mV Internal memory MFT1835 Capacity 1000 results Bluetooth communication Power consumption Nominal minimum 60 mA Voltage range with no input voltage Nominal maximum 350 mA Active Insulation test set to 1000 V 1 MQ Range 20 C to 55 C Temperature via 3rd Party Module Intrinsic accuracy 1 0 2 digits Resolution Le Range 20 C to 100 C 39 Environmental Specification Temperature Operational range 10 C to 55 C Storage range 25 C to 70 C Humidity Operating humidity 90 R H at 40 C max Altitude 2000 m to full safety specification Weight 1000 g 10 including batteries but excluding test leads accessories and carry case Dimensions 150 mm high x 85 mm wide x 235 mm deep 6 in x 3 5 in x 9 5 in IP rating IP54 Power Supply Battery Primary 6 x 1 5 V cells IEC LR6 type AA alkaline Battery Rechargeable 6 x 1 2 VNIMH cells EC HR6 Display shows rechargeable NiMH when the battery type is changed in setup option Section 10 Safety EMC EMC In accordance with IEC61326 edition 2 Locations Class B locations Safety in accordance with BS EN 61010 1 2010 61010 30 2010 I
3. Dh 4k 1 i fy e Om z s 4 Press the Function key lt gt to select the 2Lo mode en N iM NiMH lt umm LI v Uo Press TEST to start the test sequence 6 On completion of the test the display will show the loop resistance on the large display segments and the fault current on the small display segments 7 3 Phase to Neutral or Phase to Phase testing Note Only the 2Hi mode is available on this range 1 Set the LEFT rotary range knob to the E range E On the MFT1720 and 1730 set the RIGHT rotary knob to E ys e ay TRUE RMS MFT1710 MFT1720 and MFT1730 3 Connect the test leads to the circuit as below with the Red test lead connected to the L1 Red terminal on the MFT and the Blue test lead to the Blue L3 terminal 19 4 Press and release the TEST button to start the test 5 On completion of the test the display will show the loop resistance on the large display segments and the fault current on the small display segments 7 4 Prospective Fault Current and Short Circuit calculation PFC amp PSCC The prospective fault current and short circuit current of a circuit is automatically calculated when making a loop impedance test The calculation uses a nominal circuit voltage not the actual circuit voltage and is displayed above the loop impedance measurement as below UL 50 V T UL 50 V TM D irt 0L 01 ALL a t LLLI A 1 1D irt SS gt
4. You will be prompted during the pairing process to enter your passkey enter 1234 During the pairing process you may also be prompted to enable the Bluetooth Serial Port Ensure this option is chosen if you are given this option ra Once you have clicked Finish on the wizard on the PC Laptop the pairing process will now be complete and your PC Lap top pairing code will be displayed on the MFT You can now turn the dial and leave the settings Spanner position on the MFT Bluetooth Pairing Windows CE 1 Set the MFT Range knob to the Bluetooth SET UP position 2 Press the Bluetooth Lock button on the MFT the MFT will show if no pairing exists or the last three digits of a paired identity if already paired If these three digits are the last three digits of your Bluetooth identity code e g 963 then you are already paired with it If you don t recognise them or are unsure then continue with the pairing process 3 i Turn on your PDA and select Start then Settings ii Select the Connections Tab ili Select the Bluetooth symbol and select Turn on iv Select Use Bluetooth Manager option v Select Menu and Paired Devices vi If there are no paired MFTs shown then select Add Note If there is a MFT symbol present check that it has the serial number displayed as your MFT If this isn t the case then delete the MFT from the PDA and continue with the pairing procedu
5. A 3 wire low current loop impedance test This test requires all three connections Where to use For making L E measurements on circuits where all three conductors are available AND the Phase Earth circuit is RCD protected REQUIRES ALL THREE TEST LEADS TO BE CONNECTED 2Hi A 2 wire high current test A fast 3 4 second test using high test currents Where to use On ALL circuits except Phase Earth measurements on RCD protected circuits 2Lo A 2 Wire low current loop test for L E measurements where the 3rd conductor in not available Where to use On RCD protected circuits where access to all three conductors is not possible Note 2Lo is not available when all three leads are connected as the 3Lo is the preferred measurement mode Selecting the test mode To switch between Loop test modes press the Function button as below Press the function key lt gt to change between 3Lo 2Hi amp 2Lo 14 The test mode is displayed as below UL 50 V imm UL 50 V um PEN ON TIT E d 1 1 lt lt a lt Ll v LI v Liv Default mode 1st Press 2nd Press Note RCDs can still trip when performing a non trip loop test if there is an existing high level of fault current flowing in the Earth conductor or the RCD is not operating within specification 7 1 2 L Nor L L circuits V V V 1kV TRUE RMS L N or L L selected Test perf
6. Display range 0 01 Q to 1000 Q Supply 48 V to 480 V 45 Hz to 65 Hz Test current high 4 0 A at 230 V PSCC range 20 kA EN6155 range 0 30 O to 1000 O Max service error 10 2 digits MFT1710 280 V Loop test 3Lo 2Lo L E Intrinsic accuracy 0 01 O to 39 9 O 5 5 digits 40 0 O to 999 O 10 5 digits Display range 0 01 O to 1000 0 Supply 48 V to 280 V 45 Hz to 65 Hz Test current Pulsed PFC range 20 kA EN6155 range 1 00 to 1000 O Max service error 10 2 digits RCD test Intrinsic current accuracy No trip test 1 2xl 10 to 0 Trip test 1xl 2xl and 5xl 0 to 10 Ramp test current 5 1 digit Trip time 1 1 ms Programmable step increments 10 mA to 50 mA 1 mA steps 50 mA to 500 mA 5 mA steps 500 mA to 1000 mA 10 mA steps Supply 48 V 280 V 45 Hz to 65 Hz Max service error 10 2 digits 38 Voltage Intrinsic accuracy 2 1 V EN61557 1 Range 10 V to 600 V Phase rotation indication Max service error 5 2 digits Frequency Intrinsic accuracy 0 5 2 digits Resolution 0 1 Hz EN61557 Range 15 Hz to 400 Hz Max service error 5 3 digits Earth Test Ranges Intrinsic accuracy 2 0 3 digits ART method 5 0 3 digits Stakeless method 7 0 3 digits Resolution 0 010 EN61557 range 1 0 O to 1 99 kQ Current 0 45 mA or 4 5 mA Noise rejection 20 V pk pk 7 V rms Max probe resistances Rp Rc 100 kQ 50V Max service error 20 3 digits
7. resistance versus potential stake position is plotted and the resistance of the electrode under test is taken to be the point at which the curve is flattest Empirical testing has shown that with suitably positioned stakes this method can be shortened by placing the potential stake at a dis tance of approximately 62 between the electrode under test and the current stake i e at A 0 62 x B Potential stake Current stake Schematic for three terminal resistance measurement 37 General Specification Accuracy Insulation test 1000 Volts 10 kQ 999 MO 3 2 digits 500 Volts 10kQ 500 MQ 3 2 digits 2500 MO 10 4 digits 250 Volts 10k0 250MO 3 2 digits 2250 MO 10 4 digits 100 Volts 10kQ 100 MQ 3 2 digits 2100 MO 10 4 digits EN61557 range 10 kQ 999 MO 1000 V range Voltage display 3 3 digits 0 5 of rated voltage Max service error 15 2 digits Short circuit current 1 5 mA nominal test current Test current on load gt 1 mA at min pass values of insulation Output voltage tolerance 0 20 at rated load or less Continuity Resistance Intrinsic accuracy 2 2 digits 0 01 O to 99 9 Q 5 2 digits 100 to 99 9 kQ EN61557 range 0 1 Q to 99 9 kQ Open circuit voltage 5V 1V Test Current at 200 mA 0 Q to 2 QO gt 200 mA x20 Test Current at 15 mA 00 to 2 Q gt 15mA lt 2 0 Max Service error 12 2 digits Loop test 2Hi L PE L N L L Intrinsic accuracy 5 3 digits
8. used to measure resistance less than 2 Q Possible sources of error Measurement results can be affected by the following B The presence of circuits connected in parallel H Presence of AC voltages on the circuit being measured Bg A poor connection to the circuit under test H Incorrectly nulled test leads BH Use of fused leads 6 Insulation resistance amp IMPORTANT The insulation test is protected by a live circuit warning Detection of a voltage over 50 V will inhibit testing This applies whether or not the insulation test is locked on 6 1 Making an INSULATION measurement 500 1 Set the left hand rotary range knob to the insulation test voltage required R1 A RCL snp V TRUE RMS 22 Connect two test leads to the L1 ve and L2 ve terminals on the instrument 12 2 To start test press and hold either of the TEST buttons 4 or a on the instrument Release the test button after the displayed reading has settled Circuit will now discharge safely Note A 1000 V warning is displayed whenever the 1000 V range is selected for the first time and the TEST button is pressed 6 2 Insulation test lock To lock an insulation test ON hold down either of the TEST buttons followed by either of the RED LOCK buttons Hold down the TEST button a gt then press the red LOCK button HS To release the Locked on insulation test press the TEST button Warning The test voltage will be perman
9. 3 Press the TEST button 4 The MFT will display the trip time of the RCD 8 12 Touch voltage display The voltage to which an earth conductor may rise during an RCD test The limit for touch voltage is 50 Vac or 25 Vac depending on the environment Touch voltage is caused by excessive resistance in the earth circuit when a load is placed between the live and earth conductors Touch voltage is displayed at the end of an RCD test the voltage is below the safe limit before an RCD test is started if it would exceed the safe limit Touch voltage L 80 V TLI Touch voltage D ee A a c e y RCD trip time L Lf m 9 ne ININ RCD test gt r multiplies 1 xI Touch voltage is calculated using the nominal trip current of the RCD x Earth resistance For example RCD trip current 30 mA Earth resistance 1000 Q 0 03 A x 1000 Q 30 V If the calculated touch voltage is less than the Touch voltage limit the RCD test will proceed If it is greater than the limit set the test is halted The Touch Voltage limit is set in section UL 25 V 50 V 60 V Notes The touch voltage is always displayed using the nominal trip current of the RCD ie 1xl If using the 1 2xl 2xl or 5xl test ranges the touch voltage will still be displayed for 1xl test current as per IEC 61557 6 2x and 5xl can create real touch voltages during the test that are higher than the displayed value If this voltage excee
10. be displayed in the large readout and the small readout UL 50 V TIT 6 Move to the 2nd socket to be tested and make another loop test If the result is less than the first the large readout will show the new value but the small readout will remain unchanged If the new value is higher the small readout will be updated accordingly as below UL 50 V TUE UL 50 V TH 2nd result lower than 1st result 2nd result higher than first result J Repeat the loop impedance test at each of the remaining sockets At the conclusion of testing simply read off the Zmax value from the upper display readout This value is retained until the instrument is switched off or automatically switches off 7 7 Making an R1 R2 Loop impedance measurement MFT1720 and MFT1730 only The R1 R2 mode requires a reference measurement to be made typically Ze or Zdb This is then automatically subtracted from the circuit loop impedance when measurements are made in the R1 R2 mode 1 Set the RIGHT rotary range knob to the Zref range uo SS yy R1 A 1kV TRUE RMS 2 Make a loop measurement using either the Phase to Neutral or Phase to Earth methods above This value is automatically stored as the reference value This can repeated If necessary 21 UL 50 V WUT R1 ES Switch the range knob to and make loop impedance tests as previously The Main readout will show the R1 R2 value eg Zs Zref The small readout
11. care for your Megger products Returning your product to Megger UK and USA service centres l When an instrument requires recalibration or in the event of a repair being necessary a Returns Authorisation RA number must first be obtained from one of the addresses shown above You will be asked to provide the following information to enable the Service Department to prepare in advance for receipt of your instrument and to provide the best possible service to you E Model e g MFT1730 E Serial number to be found on the underside of the case or on the calibration certificate E Reason for return e g calibration required or repair E Details of the fault if the instrument is to be repaired 2 Make a note of the RA number A returns label can be emailed or faxed to you if you wish 3 Pack the instrument carefully to prevent damage in transit 4 Ensure the returns label is attached or that the RA number is clearly marked on the outside of the package and on any cor respondence before sending the instrument freight paid to Megger Copies of the original purchase invoice and packing note should be sent simultaneously by airmail to expedite clearance through customs In the case of instruments requiring repair outside the warranty period an immediate quotation can be provided when obtaining the RA number 5 You may track the progress of your return on line at www megger com Approved Service Centres A list of Approved Service Centre
12. it is gt 30 mA 2 To select a Type B RCD press and hold the mode button lt gt repeatedly until the symbol is displayed E Connect the Red L1 Green L2 and Blue L3 terminals of the MFT to the RCD Live Neutral and Earth as below type AC and type A RCD s only need Phase and Earth connections Type B RCD 4 Select the 1xl range on the left range knob and the current rating of the RCD on the right range knob 5 Press the TEST button 6 The RCD should trip and display the trip current in mA The Touch Voltage is displayed on the small digital readout Notes Only 1 xl is available Selecting other test currents will reset the test type to AC Only 10 mA 30 mA 100 mA and 300 mA test options are available on DC testing 26 8 9 Variable RCDs not MFT1710 A To test an RCD with a variable trip current select the VAR option on the secondary right range knob 2 Press the lt MODE button to select the symbol U 50 V mi 3 Use the UP and DOWN arrows on the right hand TEST and LOCK buttons to set the tripping current to match that on the variable RCD The tripping current can be selected as below 10 mA to 50 mA 1 mA steps 50 mA to 500 mA 5 mA steps 500 mA to 1000 mA 10 mA steps 4 Save this current using the left hand Red LOCK button 23 Test using the previous test options above 8 10 AUTO RCD testing The AUTO function of the RCD test options automatically p
13. running PowerSuite Mobile or both See section 10 Setup Test results are stored in Folders against a set of circuit references as below Folders Jb 000 to 255 Job number Allows results from different locations to be saved in one instrument Db 001 to 255 Distribution board number CIR 000 to 255 Circuit reference number PHA 001 to 003 Phase number Circuit type In addition the following circuit descriptors are used to identify on which part of the circuit the measurement was made Insulation Symbol Definition L E Live to Earth Test L n Live to Neutral Test n E Neutral to Earth Test L L Live to Live Test No connection selected Continuity Symbol Definition R1 Live R2 Circuit Protective Conductor R12 R1 R2 RR1 Ring Circuit Phase Phase RR2 Ring Circuit CPC CPC RRN Ring Circuit Neutral Neutral uS No connection selected Loop Testing L E range measurements are automatically saved as L E connections L N range Symbol Definition L E Live to Earth Test L n Live to Neutral Test L L Live to Live Test RCD Not relevant Earth testing Earth measurements are saved under a job number only Storing Test Results in the internal memory Note that in order to store test data the Store Mode needs to be set to internal or internal and Bluetooth See section 10 SETUP OPTIONS for further details 1 Perform the desired test as described previously 2 Press and release the Bluetooth Lock button to display the firs
14. the setup mode 2 Press the J3 button on the MFT until you see StR appear on the display At this point you should ensure that bt is displayed in larger letters on the main part of the MFT s display If this is not the case use the right hand TEST amp Lock buttons as UP DOWN arrows to scroll through the options to select your chosen communication method IN Internal Only Bt Bluetooth Only 3 Once you have selected your chosen storage communication location press the left hand Bluetooth Lock button once to save this as your preference The Lock icon will now stop flashing in the upper left hand corner of the MFT s display and disappear to indicate your preference has been saved 4 You will now need to press the J3 arrow once to display the bt setup option 5 To enter the Bluetooth pairing mode you will now need to push and hold down the left hand Bluetooth Lock button until you see two oscillating chevrons lt gt appear on the display and then release The Bluetooth pairing will fill the first empty slot available if there are no empty slots left it will overwrite the currentlyshown slot on the MFT s display If all slots are currently in use and you wish to add another display on the screen the slot that you want to overwrite To do this use the right hand TEST amp Lock buttons as UP DOWN arrows to scroll through all 5 slots 6 From your PC Laptop run the Add Bluetooth Device wizard
15. DOWN the mode button lt gt for 2 seconds whilst in RCD test mode Repeat until the RCD type is displayed Refer to table above for symbol options and descriptions Note Type B RCD testing only available on MFT 1730 8 3 x RCD current rating No trip test 1 Set the LEFT rotary range knob to the a RCD test range 2 Set the RIGHT rotary range knob to current rating of the RCD under test 30 30 mA etc Ensure the display shows 0 in the display see below V E 1kV R2 RCL SND Zref DEL L PE Max L L lt 1 2 I TRUE RMS u 50 V T HB 3 Connect the instrument Phase L1 and Earth L2 terminals to the RCD phase and Earth terminals or to the phase and earth of the circuit the RCD is protecting Use either the separate leads leads T poem O mains plug 23 4 Press the TEST button The Display should show one of the following a imm Touch voltage limit Measured touch voltage ee i RCD Trip time No trip s 0 RCD Type N N ms RCD Test a ae l l 4l MW AJ If the RCD Trips the MFT will flash the trP warning and then display the following UL 50 V TIE NOTE For Type AC RCDs there is no need to perform a 180 test on the Yl mode as the test uses a full AC waveform 8 4 1x1 RCD current rating Tripping test on 30 mA RCD 1 Set the LEFT rotary range knob to the 1 RCD test range ye ES oy 1kV L PE T
16. It is impossible to guarantee that an RCD will not trip If there is a risk associated with tripping an RCD alternative methods should be used for testing the circuit Using 3 wire measurement 3Lo Al Set the LEFT rotary range knob to the range 2 On the MFT1720 and MFT1730 set the RIGHT rotary knob to z 17 100 250 500 MQ ys I Ey 1kV L PE e L L TRUE RMS MFT1710 MFT1720 and MFT1730 3 Connect test leads as below with the Red test lead connected to the L1 Red terminal on the MFT the Green test lead connected to the Green L2 terminal and the Blue test lead to the Blue L3 terminal UL 50 V MUU lt gt lt gt LI vy 5 Press TEST to start the test sequence This can be automated in SETUP so the test starts when contacting the circuit See section 10 6 On completion of the test the display will show the loop resistance on the large display segments and the fault current on the small display segments Using 2 wire measurement 2Lo 1 Set the LEFT rotary range knob to the range 2 On the MFT1720 and MFT1730 set the RIGHT rotary knob to E 100 R 500 MQ V V 1kV L PE TRUE RMS MFT1710 MFT1720 and MFT1730 3 Connect the test leads to the circuit as below with the Red test lead connected to the L1 Red terminal on the MFT and the Green test lead to the Green L2 terminal 18 L 34 aCe CD MCB RCD a 4 grum
17. MFT1700 series Multifunction testers User manual Contents xx zd coc m w J EE 3 1 TAB TCI NEV ON A A ENE RR E A EE EN N A EAA E AAE E O E 4 2 grill E E E E A EE Pe ners A E A E O AT E E ere ree A E A E E E E E A 4 21l AUN ANG I CONOS seater tae nt EEE a EE a EEA ace EE OE EENE E EEEa ENS aa a mons eE Ee a aE R S Ee E 6 2 2 Waste electrical and electronic equipment sssssssssssssssssssessseneeeeee nnnm n nn nnn nn nn nn nnne sni rni s s ess rrr nn nnns nnns 6 2 9 Bater and Fuse Location iting and replacement sssrin aE E aaa ae EE eE asaini 6 BION e E AE EEE E EE E E E EE 7 231 CREF all OC eh model EN co mmc 7 22 Node OUI MIU SUEDE 7 LS 20 eee eee eee ee eee eae are eee ee ee ee ee ee ee eee en 7 Voltage frequency Current and temperature measurement 44 Making a VONAGE measurements rriaire a ai suada Rodi ai paalo unl S RE EUR d canals co d uia t 8 5 Continuity resistance MeasuremEN REIR TO Lm 10 5 1 Nulling test lead resistance up to 9 990NMS asxcxssiterknktixentakud same cunnan hu ta Ie EUER nua EEEE kie iit eno c thui 10 B Watling a CONTINUITY queas elfe Y sessist kaain a pond oat osito a tct raptu 11 5 3 Storing downloading results VIET 1 790 OTI B uoccsedezcuuxnetip uuuictre xeu eiie upper uut ritu aae tre rc dtd 11 zx COTE URN Buzzer ON OE T 11 LEA soos che Qo NIRE mS 11 S6 BUZ
18. MFT1730 set the primary range knob to clamp position le M Connect to ICLAMP part no ICLAMP to the ICLAMP Meo socket on the MFT i3 Connect the clamp to the circuit conductor The instrument will display the ac current flowing in the conductor 4 5 Temperature measurement not on MFT1710 1 Connect the thermocouple transducer to the L1 ve and L2 ve terminals 2 Press the Mode button to select C Pressing the mode button will cycle round the V mV and C measurement modes The display will show the temperature at the tip of the temperature probe 4 6 Switch probe In the V mV C mode all measurements except temperature can be made with the remote switch probe Tests are automatic and do not require the test button to be pressed 1 Connect the switch probe to the switch probe socket The probe replaces the standard RED test lead and can now be used as a normal test probe 5 Continuity resistance measurement IMPORTANT The continuity test will auto range from 0 01 Q to 99 9 kQ Circuits up to 2 Q will be tested at 2200 mA To change the test current go to seciton 10 Setup The continuity test is automatic The test starts as soon as the leads are connected to a circuit The TEST button is ONLY used to null the lead set Warning Prior to any continuity testing ensure the circuits under test are isolated and not live SETUP allows the follow configuration options E Positive test current E Bi Directional test cu
19. Q mmm Lik d LILIL The fault current is calculated using the expression PSCC or PFC z Nominal supply voltage in Volts Loop resistance in Ohms Example PSCC or PFC 230 V 0 13 0 1769 VA displayed on the MFT as 1 77 kA The nominal supply voltage used in the calculation is automatically selected depending on the actual circuit voltage The instrument uses the following voltage values Actual measured voltage Nominal voltage lt 75V 55 V gt 75 V and 150 V 110 V gt 150 V and 300 V 230 V 22300 V 400 V 7 5 Zmax test mode MFT1720 and MFT1730 only Ideal for multiple loop measurements on a ring final circuit where the highest loop value is to be recorded Both and I test options can be used The current loop test value is displayed on the lower larger readout whilst the maximum measured value of the sequence is displayed on the upper smaller readout 7 6 Making A Zmax loop impedance measurement 1 Set the LEFT rotary range knob to the Or E range 2 Set the RIGHT rotary knob to mar 20 ye EES By TRUE RMS 3 Connect the test leads to the Phase L1 and Earth L2 or Phase L1 and Neutral L3 terminals on the tester depending on the selection in 1 above 4 Connect the test leads to the Phase and Earth conductors or Phase and Neutral conductors as required If using the mains plug test lead connect to the first supply outlet 5 Press the TEST button The loop impedance will
20. RUE RMS Y Connect the instrument as in 8 3 3 Press the lt gt mode button to select 0 4 Press the TEST button The Display should show one of the following 24 eet MM Touch voltage limit Measured touch voltage L RCD Trip time Ee 5 III dos RCD Type ms RCD Test MD L N I X any value below 300ms indicates an RCD has tripped in an adequate time 5 Press the lt gt mode button to select 180 6 Repeat the above test Record the higher of the two values 8 5 5 x1 RCD current rating Tripping test on 30 mA RCD Repeat the test sequence in 8 4 but with the LEFT rotary range knob to the 2 RCD test range 100 g 500 MQ LOOP R1 A V V 1kV g2 RCL SND Zref DEL Max TRUE RMS 1 Press the lt gt mode button to select 0 2 Press the TEST button The Display should show one of the following ae 50 V Touch voltage limit Measured touch voltage m LIV RCD Trip time Bcc NN m 0 If fms RCD Type RCD Test Ps NN LI 5 xl any value below 40ms indicates an RCD has tripped in an adequate time 4 Press the 9 mode button to select 180 5 Repeat the above test Record the higher of the two values 8 6 Ramp test a The RCD trip current is measured by applying a test current of half the rated trip current and increasing this every 300 ms or 500 ms for type S RCDs from 30 to 110 of the RCD current ratin
21. UE RMS OR if Using the Mains plug Lead SAI10 a For Live to Neutral measurements connect the Red connector to the L1 terminal and the Blue connector to the L2 terminal b For Live to Earth measurements connect the Red test to the L1 terminal and the Green connector to the L2 terminal S Connection a Connection b Note When connecting all three test leads eg Phase Neutral and Earth or the mains plug test lead the voltage displayed is the high est of the three possible voltages On models with a dedicated mV range this is selected using the Mode 4 to select mV mode 4 2 Frequency measurement 1 Automatically displayed when connecting to a live circuit as per 4 1 above 4 3 Phase rotation Not MFT1710 Display of Phase rotation is Automatic when all three test leads are connected to the 3 phase supply as below Al Set the main rotary range knob to volts The position of the right hand rotary range knob does not matter 2 Using three test leads connect test leads to the L1 to Phase1 L2 to Phase 2 and L3 to Phase 3 The MFT will display L1 L2 L3 or L1 L3 L2 depending on the direction of phase rotation ai Mmmm UL 50v TU Lee ghz LI tLnz 4233 ain Jf L2 Laf mm lt gt ER V L1 i L3 L2 V Normal rotation Reverse rotation 4 4 Leakage current measurement Leakage current measurement uses the optional accessory current clamp ICLAMP 1 On the MFT1720
22. ZI NO eom 12 5 7 Measurement methods and sources of error sssssssssssssssssssse II I e eR n n tee AAEE E EEEE nnn nsns s nnns nasi einn ense sese nsns anna 12 6 1 Making an INSULATION Me aSUreMeNL ccccccccccce eee ccceeeeeeeeeeeceeesseeeceeeeeaeeeeeeeeeeeaeeeseeceeseaeeeeeeeeeseeseeeeseesaaneeeeeseasaneses 12 WSO cgo NIE ET T OD e i e E 13 63 Measurement methods and sources Ol ETOT scanszcsuncsamnrrseretanneatinhinnobiiadanetnontisnaimes ac aU AE CER GED E MEUS tats Eb ORO MEAE EU DEEP HEURE 13 Zi dangeselecion ad test leads usus cnptnncn txtoin tiep tont duod matte ethane Fach cun xd i M du ku tron d aA 14 7 2 Making a loop impedance measurement asesir menaa E a EAEAN ENEE EEEN d US EUN tuna n DN PERSE EC UE E BUG EE 15 9 Phasedo Neutral tor Phase TO Phase TESTING cirrosis ERE MEEE NM RUE ERR Nx Eoo bebe phu E e Reg ated SUE UI Era Rat MEER ERES 19 7 4 Prospective Fault Current and Short Circuit calculation PFC amp PSCC ssssssssssssssssee II mm ene nnnm 20 735 LMX L mode VIET 1720 ang 1730 OI esses ruis e pup Rem tours PUn UI AR eque e ed EE Ea esee edes eren a MD EUM MEE SEE 20 7 6 MAKING A Zmax LOOP IMPEDANCE MEASUREMENT ccccccccccsesceccceeeeeeeececceeaseeeecceeeeeeseceeseeseeeceeeeeeaseeeseeeeeanenees 20 df WAKING AN R1IARZ LOOP IMPEDANCE MEASURENMEN T tcicctepa stes erra peru cien ha qtto c Phe ren ebat hike bt Ge Pie enims 21 7 8 Measurement methods and sources of error
23. able conditions m Do notoperate the instrument or connect it to any external system if the battery compartment or casing is open or any parts of the case including keypad selector switch display window etc are missing m Always disconnect the instrument from all systems while batteries are being changed or the fuse replaced m Do notreplace the rechargeable cells in the MFT1730 with non rechargeable dry cells and attempt to charge the cells This can cause explosion or fire m Do not operate the charging equipment supplied with the MFT1730 in damp or wet environments or outside All test leads must be removed from the instrument while charging m After insulation tests capacitive circuits must be allowed to discharge before disconnecting test leads Locking the insulation test ON should only be used where there is no risk of a circuit holding a charge m The instrument should not be used if any part of it is damaged m lest leads probes and crocodile clips must be in good order clean and with no broken or cracked insulation m All test leads supplied with the instrument form part of the measuring circuit of the instrument They must not be modified or changed in any way or be used with any other electrical instrument or appliance A plug severed from the power cord MUST be destroyed as a plug with bare conductors is hazardous in a live socket outlet Ensure that hands remain behind guards of probes clips when testing U K Safety Auth
24. al and electronic equipment The Registration No is WEE HEO146QT 2 3 Battery and Fuse Location fitting and replacement Battery type 6 x 1 5 V Alkaline LR6 AA or NIMH HR6 rechargeable Fuse type 2 x 2 A F HBC 50 kA 600 V Battery condition is shown by the following display symbols 100 MM FULL 75 0 eo 50 ME n LIL 25 Ill ov 0 EXHAUSTED Flashing Where NiMH rechargeable batteries are fitted the battery condition display can be adjusted accordingly Refer to section 10 SETUP OP TIONS to change between alkaline and rechargeable batteries When set to NiMH batteries the battery indicator in the display wil show NiMH under the battery status symbol as below Feature avail able on all models Lu ri NiMH To replace batteries or fuse Switch off the instrument Disconnect the instrument from any electrical circuits Remove the battery cover from the base For battery replacement a Remove old cells and refit new batteries following correct polarity as marked on the battery holder C Replace the battery cover Incorrect battery cell polarity can cause electrolyte leakage resulting in damage to the instrument For fuse replacement a Withdraw each fuse in turn and check for failure The blown fuse must be replaced with a 2 A F HBC 50 kA 600 V fuse Rechargeable batteries and battery charging The MFT1730 is supplied with rechargeable NiMH cells These batteries can be charged in the instrume
25. ds the touch volt age limit UL the test will be stopped Under these conditions the display will show the calculated touch voltage on the small digital segments and gt 50 V on the larger digital segments as below 28 UL 50 V MIT 5xI 8 13 Measurement methods and sources of error RCD testing Method of measurement A two wire lead or mains plug lead should be used for this measurement A constant current source is connected across the supply and the time taken for the supply to trip is measured by the instrument in ms RCD testing Possible sources of error Measurement results can be affected by the following e Significant operating errors can occur if loads particularly rotating machinery and capacitive loads are left connected during tests e A poor connection to the circuit under test 8 14 Useful information It is only necessary to test the 10 mA and 30 mA at 1 2xl 1xl and 5xl All other RCDs only need to be tested at 1 2xl and 1xl Always press the RCD TEST button on the RCD to ensure the function works It is recommended the RCD test button is tested AFTER the timing tests above are complete This can identify RCDs that may stick or fail if not checked periodically 9 Earth resistance measurement The Megger MFT family of test instruments offers a unique solution to the measurement of earth or ground electrode rod supporting 2 and 3 wire measurements For the principles of earth resistance testing
26. e installation are isolated switched off eg automatically switched loads or motor controllers 8 Residual Current Device testing The MFT1700 series can perform the following RCD tests 1 21 Non tripping test at half the rated RCD trip current for 2 seconds during which the RCD should not trip l Tripping test at the rated RCD trip current The trip time will be displayed 5I Tripping test at 5 x the rated RCD trip current The trip time will be displayed in milliseconds 0 or 180 Some RCDs are sensitive to the polarity of the supply i e whether the test current is applied with the instantaneous rising or falling Tests should therefore be performed with the polarity 0 and 180 and the maximum time recorded RampTest Used to check the trip current of an RCD The MFT1700 series can test the following RCD types AS A S and Programmable typically a type A RCD with variable disconnection time The MFT1730 can also test Type B RCDs RCD5 are also available with a Selective Delayed trip time These are referred to as Type S These RCDs do not trip instantly allowing ordinary type RCDs to trip first 22 The characteristics of each RCD type is detailed below Operate with AC eens Operate with AC and pulsed DC residual earth currents Description currents only General purpose protection of Sinusoidal AC supplies Trip times as defined in BS EN y gt 300 ms 21999 gt 300 ms gt 1999 ms ms UK No tr
27. ector 2 1 1 Display UL 25060V 44090 6100 t IMT 800 1 NiMH i nA Te E SN je ml ml mL MM Display symbols Test function locked on also Warning triangle instruction to used to indicate a change is refer to this user guide saved in setup I TM Battery indicator Touch voltage limit and Earth Battery type set to rechargeable test voltage set to 50 V NiMH Change in setup section change setup 10 Indicates that the ground noise voltage exceeds the instrument 2 SENARE measurement capability test is inhibited Potential stake P stake RCD test in AUTO mode resistance exceeds range for accurate measurement Current stake C Stake NJ Type AC RCD selected resistance exceeds range for accurate measurement Ground noise voltage exceeds Type A RCD selected range for accurate measurement of resistance Type S RCD Type AC VCLAMP error Type S RCD Type A ICLAMP error m Type B RCD selected Bluetooth enabled Fast or Full RAMP test selected E Due is too hot allow to N L Live and netural connections reversed R1 R2 Loop measurement with Zref value automatically deducted ZMAX Loop maximum measurement U 50V 2 2 Waste electrical and electronic equipment WEEE The crossed out wheeled bin placed on Megger products is a reminder not to dispose of the product at the end of its life with general waste Megger is registered in the UK as a producer of electric
28. ectrical installations as defined herein If used in a manor other than those defined in this user guide the protection capabilities could be impaired with poten tial risk to the operator and the instrument Symbols used on the instrument are A Caution Refer to accompanying notes Maximum 300 V a c CAT IV to earth Maximum nominal system voltage of 600 V Instrument protected by 2 x F2A 600 V 50 kA fuses C C Equipment complies with current EU Directives This equipment should be recycled as electronic waste 9 Equipment complies with C tick requirements 12Vdc 12 Vdc charger socket 1 Introduction Congratulations on your purchase of a genuine Megger Multifunction tester The MFT1700 series Multi function tester is a compact instrument designed to perform all of the functions required by the electrical contractor to fully test domestic commercial and industrial wiring Specially designed to comply with U K European and other International wiring regulations and standards the MFT1700 may be used on all single and three phase systems with rated voltages up to 300 V a c rms to earth ground 2 Overview 2 1 Front panel and controls Test button Primary Seconda Test button ry Lead null Mode Display functions functions Lead null RLA RCL SND selector Zref Max A L E 7 TN n 500 MO LOOP Setup TRUE RMS cohip calactox Display Touch voltage Test Lock Results store Backlight contact point Setup sel
29. edure 4 Push the Bluetooth Lock button again to start the pairing process the MFT will display D Once paired select the MFT symbol on the display and select OK 6 Enter the access and select key code 1234 and select OK 7 The MFT will display the last three digits of your Bluetooth identity code when a successful pairing has been achieved e g lt gt 963 8 On the Symbian device select the top left hand menu button Yes to authorise the Symbian device to make the connection automatically 9 Elect Exit to return to the main Symbian desktop Appendix C Installation category definitions IEC 61010 2 030 defines measurement categories Il to IV relating to transient over voltages and locations within electrical installations Examples of electrical installation category rating are Category Il a mains socket outlet Category Ill the wiring between the socket outlets and the consumer unit Category IV the supply to the consumer cut out from the distribution network transformer For further information on category ratings visit the relevant product page on www megger com Appendix D Safe working practice It is important that before the instrument is used and when testing is completed the functions of the instrument are proven to be working This is to ensure that a hazardous condition is not mis reported by the instrument as being safe For example By checking the voltage range correctly meas
30. ently present on the test probes or crocodile clips when in the locked position Warning Auto discharge Auto discharge facility automatically and safely discharges the circuit at the completion of an insulation test Live circuit warning operates when connected to Live circuits gt 25 V Testing is still permitted Test inhibited Live circuits greater than 50 V will inhibit testing 6 3 Measurement methods and sources of error Method of measurement The selected dc test voltage current limited to less than 2 mA d c is applied to the circuit under test and the resistance is calculated from measurements of the resulting voltage and current Capacitive circuits can take some time to charge This is displayed as an increasing voltage that takes longer to reach its maximum than normal The reading is stable with a circuit capacitance less than 5 uF 7 Loop impedance testing IMPORTANT This measurement requires both selector knobs to be set to the Loop testing mode GREEN RANGES on the MFT1720 and 1730 or just the left knob on the 1710 This is a live circuit test All precautions relevant to working on live circuits to ensure the safety of the operator and any other personnel should be in place Overview of the LOOP IMPEDANCE test A Loop impedance test is the measurement of the impedance of a circuit whilst the circuit is electrically live Unlike a continuity test a loop impedance test applies a load to the circuit and measure
31. erforms the 1 2xl 1xl and 5xl in both 0 and 180 without touching the MFT The operator can stand by the RCD and reset the device each time it trips Test sequence in AUTO mode RCDIpe AC AC S a a s B farce fv vt p axe fy fv mexwe v fv sexe v fv i sexwe v fv i To test the RCD in AUTO mode 1 Select the AUTO range on the left range knob 2 Select the RCD Type as in section 8 2 above 3 Connect the Red L1 and Green L2 terminals of the MFT to the RCD as in section 8 3 4 Press the TEST button on the MFT The test sequence as in the table above will be performed Each time the RCD trips it should be reset The MFT automatically detects the reset and continues testing until the RCD stops tripping The MFT will display END hs Return to the MFT and press the mode button to scroll through the test results in sequence 8 11 3 Phase RCD testing The MFT1700 series is designed to test RCDs on 3 phase installations To test RCDs in a 3 phase system each RCD is tested as a single RCD from Phase to earth As described in section 8 1 to 8 5 Where no earth is available the upstream downstream method can be used This requires testing across two phases as below 1 To test Phase 1 RCD connect the MFT Red L1 terminal to the downstream o p of the RCD to be tested 27 E Connect the Green L2 terminal of the MFT to the upstream phase of an RCD on a separate phase I P O P Test button
32. ertificate open on your PC or mobile device Continuity Testing 1 Perform a Continuity test as described previously 2 Press and hold the Bluetooth Lock button to display the first option Release button when R12 displayed 3 Use the Right Lock RIGHT TEST buttons to scroll through the options until the one you need is reached R2 R12 R1 RR1 RR2 or 4 Press the Bluetooth Lock button to send the test result to your PC or mobile device The display chevrons will alternate whilst the connection is being established When connected the Bluetooth symbol will flash whilst the result is transmitted B The test results will now appear in the correct box in the certificate open on your PC or mobile device Loop Testing L PE 1 Perform a Loop test as described previously 2 Press and hold the Bluetooth Lock button to send the test result to your PC or mobile device Release the button when the display chevrons start to alternate This indicates the connection is being established When connected the Bluetooth symbol will flash whilst the result is transmitted 3 The test results will now appear in the correct box in the certificate open on your PC or mobile device Loop Testing L L L N 1 Perform a Loop L L L N test as described previously 2 Press and hold the Bluetooth Lock button to display the first option Release button when L n displayed gt Use the Right Lock RIGHT TEST buttons to scroll through the options until t
33. flashing To save the change press the left LOCK button To exit SETUP turn the right range knob away from All settings can be restored to the factory defaults by setting RST to YES Saving this setting will reset all options to default The RST will then set back to NO 11 Warning messages 31 The following warning messages may be displayed during the testing process Characters which appear in the aux small digit field on the display are shown here in a slightly smaller font size 11 1 Startup warnings UNC Instrument is un calibrated 11 2 Battery bAt Low battery 11 3 Battery charger bAt CHA Battery charging bAt FUL Battery fully charged 11 4 Fuse warning FUS Fuse blown 11 5 Invalid rotary switch setting ERR General error invalid combination of rotary switches 11 6 Continuity test VOL 0 L Voltage overload during test 11 7 Insulation test 1000 V 1000 V Flashing warning before 1 kV test VOL O L Voltage overload during test 11 8 RCD Test trp Supply tripped unexpectedly 50V Test aborted due to danger of exceeding touch voltage limit Err con Hardware problem detected during High Current Loop test or RCD test 11 9 RCD range selection errors ERR gt 1000 mA Requested current is 21000 mA ERR Type A In Type A mode Instrument has been set for Type A test but Type A test is not valid with this setting ERR Type B In type B mode In
34. g When the RCD trips the current flowing is recorded and displayed in mA Making a measurement ii Select the appropriate RCD rated current on the right hand rotary switch 30 30 mA etc 2 Select the RAMP test on the left hand range knob aga OE R1 A ES 1kV r2 RCL snp Zref DEL L PE Max TRUE RMS a Press the TEST button The RCD should trip and the display show the trip current in mA UL 50 V TITTTTTT If the RCD fails to trip gt mA is displayed where 110 of the nominal RCD trip currnet dtm 8 7 Type A DC Sensitive RCD test Type A RCDs are sensitive to pulsed DC as well as AC fault currents and are tested with a pulsed waveform The RMS current is y2 x the rated operating current of the RCD As with the normal RCDs these should be tested with 0 and 180 polarity 1 To select a Type A RCD see section 8 2 These are tested in exactly the same manner as those tested in section 8 3 to 8 6 Note Type A RCDs should be tested at 0 and 180 on 1 2xl 1xl and 5xl 8 8 Type B Pure DC RCD test Type B RCDs are sensitive to pure DC fault currents as well as pulsed AC and ordinary AC fault currents First they are tested as Type A then type B using a pure DC test current Type B RCD s are only tested on the 1xl range The result displayed in milli amps mA 1 Test the RCD in type A mode for 1 2xl 1xl and 5xl if it is a 30 mA RCD Test it in 1xl only if
35. go to Appendix F 9 1 Connection terminals The terminal references used on the MFT are MFT 1700 series The terminal colours correspond to the Earth test lead set not the standard test leads shipped with the MFT1700 as standard MFT1730 Connection panel D sur p ape BG 9 2 Touch voltage limit Adjust the touch voltage limit to 25 V or 50 V depending on location Refer to section 10 29 9 3 Making a measurement Three terminal resistance measurement MFT1730 1 Connect the instrument as below Electrode under test Potential stake Set the rotary selector switch to the position 3 Press and release the ESSE button The instrument will perform pre measurement check the status of which will be indicated on the display The three terminal resistance reading will be displayed N Under certain circumstances the instrument may display a noise warning This means that interference has been detected which may impair the accuracy of the measurement In particular the reading could be lower than the actual resistance The resistance of the elec trode or system must be verified by an alternative method Note The instrument will display the warning triangle and an excessive noise voltage indicator if the ground noise voltage is above 20 V pk pk 7 Vrms Re Rs ratio must be less than 100 where Re Earth resistance Rs Shunt resistance 30 10 Setup options The Setup options allow the MFT to be c
36. h the Bluetooth Lock button again to start the pairing process the MFT will display B On the Palm device once paired select the MFT symbol on the display and select OK 6 Enter the access and select key code 1234 and select the top left hand menu button OK 7 The MFT will display the last three digits of your Bluetooth identity code when a successful pairing has been achieved e g lt gt 963 8 On the Palm device select the Done twice to get back to the Bluetooth screen 9 Select the Home button to return to the main Palm desktop Bluetooth Pairing Symbian S60 Version 3 1 Set the MFT Range knob to the Bluetooth SET UP position 2 Press the Bluetooth Lock button on the MFT the MFT will show if no pairing exists or the last three digits of a paired identity if already paired If these three digits are the last three digits of your Bluetooth identity code e g 963 then you are already paired with it If you don t recognise them or are unsure then continue with the pairing process 3 i Select Bluetooth from the main Symbian desktop and ensure it is turned on il Select the right hand Tab to show paired devices iii Select the top left hand menu button then the New Paired devices symbol Note If there is a MFT symbol present check that it has the serial number displayed as your MFT If this isn t the case then delete the MFT from the Symbian and continue with the pairing proc
37. he one you need is reached L N or L L 4 Press the Bluetooth Lock button to send the test result to your PC or mobile device The display chevrons will alternate whilst the connection is being established When connected the Bluetooth symbol will flash whilst the result is transmitted Di The test results will now appear in the correct box in the certificate open on your PC or mobile device RCD Testing 1 Perform a RCD test as described previously 2 Press and hold the Bluetooth Lock button again to send the test result to your PC or mobile device The MFT test result will flash whilst the result is transmitted 3 The test results will now appear in the correct box in the certificate open on your PC or mobile device For Auto RCD tests all results are automatically transmitted to the correct boxes on the certificate the appropriate value must be selected on the PC or mobile device for each box when prompted Earth testing LL Perform an earth test as described previously 2 Press and hold the Bluetooth Lock button again to send the test result to your PC or mobile device The MFT test result will flash whilst the result is transmitted 3 The test results will now appear in the correct box in the certificate open on your PC or mobile device 34 Appedix B Downloading data via buetooth Bluetooth Pairing PC or Laptop 1 Turn your MFT on to any setting and turn the smaller dial to the settings spanner position to enter
38. ip UK No trip Protects against AC and pulsed DC rectified AC Application lt 40 ms 30 mA RCD s only 40 ms 30 mA RCD S only Selective RCD Operates on type AC with time delay or type A with time delay For use upstream of a standard AC RCD to prevent trip contention ie Allows local trip to operate first TIP Remember S for Slow tripping 300 ms 51999 ms UK No trip 40 ms 150 ms 30 mA RCD s only Operate with AC Pulsed DC and Smooth DC residual earth currents Special applications where protection of DC as well as AC earth faults may be encountered Other types will not operate on DC fault currents gt 300 ms 21999 ms UK No trip 40 ms 150 ms 30 mA RCDs5 only 8 1 Making an rcd measurement NOTES E To select 0 or 180 press and release the mode button whilst in RCD test mode E Note Type B only available on MFT1730 E 10 mA and 30 mA RCD s should be tested at 2 xl 1 xl and 5 xI El All other RCDs only need to be tested at 1 x E trip current rating of the RCD r1 Connecting the neutral test lead in either of the above options will not affect the rcd but will detect a reverse polarity and on UK products the testing will be inhibited 8 2 Selecting RCD type Using the right hand secondary range knob select the RCD trip rating This is printed on the RCD 10 mA 30 mA 100 mA etc Select the RCD type either AC A S or B by pressing and HOLDING
39. l automatically turn itself off after 20 minutes of inactivity Press any button or turn either of the rotary knobs to turn back on 2 minute option in SETUP refer to section 10 3 1 3 Backlight Press the backlight button N The backlight will operate for 20 seconds 3 1 4 Test buttons Test buttons are duplicated on the left and right Both buttons perform the same function except when the is displayed in this case the right hand buttons perform a scrolling function The left RED button also performs storage and lock functions on the MFT1730 3 1 4 Test button lock To lock the test button hold down either of the RED test lock buttons with the T symbol whilst holding down the test but ton If w is displayed the right hand buttons perform a scrolling function 3 2 Mode button functions s The function of the mode button is dependent on the test function selected Volts mv model specific BERN Temperature requires suitable transducer Continuity Buzzer Buzzer ON Buzzes on 2 Q RLO ENABLE DISABLE Buzzer OFF May be changed in SETUP Refer to Section 10 Insulation Eia Buzzer ON Buzzes on 1 MO RSIO ENABLE DISABLE Buzzer OFF May be changed in SETUP Refer to Section 10 3Lo 3 wire no trip 3Lo default measurement 2Hi 2 wire high current 2Lo not available if 3 wire connection is 2Lo 2 wire no trip detected Loop impedance Z L PE 0 180 selection m Press and release AC Press and HOLD A Type B availab
40. le on MFT1730 only RCD Type AC s A s B EARTH RE Touch voltage limit 50 V 25 V EO J MFT1730 only SETUP Refer to instrument setup section 10 3 3 Test inhibit Each test mode has conditions under which testing will be inhibited as below 3 3 1 Insulation Detection of a circuit voltage above 50 V a warning is displayed at 25 V 3 3 2 Continuity Detection of a circuit voltage above that used by the instrument will inhibit testing 3 3 3 Earth loop impedance Touch voltage exceeds 50 V or 25 V depending on instrument configuration Supply voltage over range or under range Supply frequency out of specification 3 3 4 RCD testing Touch voltage detected or predicted to exceed 50 V or 25 V depending on instrument configuration Supply voltage over range or under range Supply Frequency out of specification 3 3 5 Earth testing External voltage greater than 25 V present Leads not corrected connected as per the test requirements Potential stake not within range Rp Current stake not within range Rc Other conditions that will inhibit testing include 3 3 6 Battery exhausted All testing will be inhibited in the event of a flat battery refer to section 2 3 4 Voltage frequency current and temperature measurement 4 1 Making a voltage measurement 1 Set the Main rotary range knob to volts The position of the right hand rotary range knob does not matter R1 A R2 RCL snp Zref DEL Max a yo ow y TR
41. lt is displayed on the screen 4 If ALL has been selected use the Right Lock RIGHT TEST buttons to scroll through the stored results a If TEST is displayed this indicates further data is available for the displayed result Use the LEFT TEST button to display this as required E g for Insulation the test voltage is available for viewing Sending stored Test Results via Bluetooth 1 Run Megger Download Manager 2 Using the approprate driver follow the on screen instructions Sending individual Blobbing Test Results Note that in order to Blob test data the Store Mode needs to be set to Bluetooth or internal and Bluetooth See section 10 SETUP OPTIONS for further details To force a particular test result into a specific certificate box double click the box within the certificate prior to Blobbing the result Insulation Testing ls Perform an Insulation test as described previously PA Press and hold the Bluetooth Lock button to display the first option Release button when L E displayed 3 Use the Right Lock RIGHT TEST buttons to scroll through the options until the one you need is reached L E L n n E L L or 4 Press the Bluetooth Lock button to send the test result to your PC or mobile device The display chevrons will alternate whilst the connection is being established When connected the Bluetooth symbol will flash whilst the result is transmitted En The test results will now appear in the correct box in the c
42. ment sssssssssssssssee ee enne nennen iris 30 TO SETUP ORTONE PREMIERE EEE AAE E E E E E E A E E S E E E S TD 0 09 9 NE Uo EORR 32 NES ae S TNCS 22 NS Era rd 22 UMS ruri CVE P TE Em 32 KE MUI a E Un 32 UMS sio esq qe MORTE 32 ERE eo uini Aic e E EE NE P T Da De TNS NUNC NUR 32 IE T PE Ec m 32 TL9 RCD range SEICCUIOMN Ee RR TU dz UV NIUMEcoIN METRE EMT 32 NEZ RET 32 PEIZ TES NOONAN SUNG Rm M 22 Appendix A Sending Storing Deleting and Recalling Test Results sessssssssssssseeenen meme RH nnns 23 Appendix B Downloading data USING Bluetooth es aon adt dd gus uen EERD Vac Dus Fe aE rasan ad aU ctt MEAE v Dv EPOR SE DU pb Vu P MD MENU M d SERM IUE 35 Appendix C Installation category CETINIMIOMS is ta etscnrainnacccensedsuusduniedoudsnntilsinsedde cnaiinicesonietadaddaaatianeeSuntsddunnd uot donee taba sextae du E rE EEEREN 36 se erred D i e voe dI i NORTE DT E RO EE NE 36 Appendix E Cleaning erc IMGINTEN EN CE x iainsintucssnciatoonirumisnasieaoascaannnaniagn GA UC PA a aU edic gur dest OR RRt EU tates theme PUR RR LM poe DO TA DRE DN TG Eb CO iaeiei 37 Appendix F Earth resistance testing Basic principles eees
43. nstallation Category 600 V Cat III 300 V Cat IV Max Phase to Phase 550 V In addition switch probe and test leads are designed to meet IEC 1010 031 2008 Double insulated to Installation Category IIl 300 V phase to earth 500 V phase to phase 40 Repair and Warranty The instrument contains static sensitive devices and care must be taken in handling the printed circuit board If an instrument s protec tion has been impaired it should not be used but sent for repair by suitably trained and qualified personnel The protection is likely to be impaired if for example it shows visible damage fails to perform the intended measurements has been subjected to prolonged stor age under unfavourable conditions or has been subjected to severe transport stresses NEW INSTRUMENTS ARE GUARANTEED FOR 1 YEAR FROM THE DATE OF PURCHASE BY THE USER Note Any unauthorized prior repair or adjustment will automatically invalidate the Warranty CALIBRATION REPAIR AND SPARE PARTS For service requirements for Megger Instruments contact Megger Limited Archcliffe Road Dover Kent CT17 9EN England Tel 44 0 1304 502 243 Fax 44 0 1304 207 342 Megger operate fully traceable calibration and repair facilities ensuring your instrument continues to provide the high standard of per formance and workmanship you expect These facilities are complemented by a worldwide network of approved repair and calibration companies to offer excellent in service
44. nt using the supplied Megger Charger To charge the batteries Ensure fitted batteries are of the rechargeable NiMH type 12 15V Connect the 12 V DC plug of the charger to the socket on the front of the MFT marked e 1 2A Warning Whenever battery cells are being recharged there should be no connections to the instrument terminals and the instrument should be switched off Warning Do not attempt to recharge non rechargeable Primary cells in the MFT1730 Doing so may result in instrument damage and may cause personal injury Ensure ambient temperatures are between 4 C and 40 C while charging the MFT Note The crossed out wheeled bin placed on the batteries is a reminder not to dispose of them with general waste at the end of their life Spent Alkaline and NiMH batteries are classified as portable batteries and should be disposed of in the UK in accordance with Local Authority requirements For disposal of batteries in other parts of the EU contact your local distributor Megger is registered in the UK as a producer of batteries The Registration number is BPRNOO142 3 Operation 3 1 General operation all models 3 1 1 Switching on Turn the rotary knob away from the off position The instrument will perform internal self tests then display the appropriate test screen depending on the position of the function knobs 3 1 2 Switching off Turn the primary function knob to the OFF position The instrument wil
45. onfigured to best suit the type of testing to which it will be used To enter SETUP right secondary range knob to SETUP Set the left primary range knob to any function other than OFF He display will show VER and the software version number It will then change to the first message in the list below Restore factory settings NO YES Insulation limit alarm Buzzer 0 5 71 2 3 4 5 10 50 100 sounds if result is higher than 500 MO 1 MO limit set Continuity limit alarm Buzzer sounds if result is below than limit set Toop Loop test ead compensation 0 039 oor US 1 2 5 19 90 1000 ON I RCD AUTO start ON OFF Touch voltage limit 25 V 50 V 60 V Auto switch OFF in minutes 2m 20m Backlight AUTO mode manual mode In Auto mode backlight comes Auto nor Auto on when at start of test end of test range change etc Alkaline or NIMH selection 1 5V or 1 2 V Depending on instrument Store mode IN Internal IN bT IN Bt Bluetooth only Bluetooth pairing bt1 bt2 bt3 bt4 bt5 INS is not available on MFT1710 ISC is not available on MFT1710 To scroll down the options press the C 39 button Each option will be is played in sequence To change the setting of each function for example INS limit alarm from 1 MO to 2 MQ use the right hand TEST and LOCK keys also marked with UP DOWN arrows Changing an option will set the LOCK symbol and warning triangle
46. orities recommend the use of fused test leads when measuring voltage on high energy systems Replacement fuses must be of the correct type and rating Failure to fit the correctly rated fuse will result in damage to the instrument in the event of an overload m Special precautions are necessary when operating in situations where live earths may be encountered isolation switches and fuses not supplied with this instrument must be used m Special precautions are necessary when working near high tension systems MV and HV rubber gloves and shoes not supplied with this instrument should be worn m Special precautions are necessary when working in wet conditions or in agricultural areas observe the local safety standards and take all necessary special precautions applicable to the particular location and do not touch the test leads with bare hands LIVE EARTH SAFETY PRECAUTIONS A Live earth is one that carries current from the mains supply or could do so under fault conditions The following warnings apply in addition to those listed previously m All persons involved must be trained and competent in isolation and safety procedures for the system to be worked on They must be clearly instructed not to touch the earth electrode test stakes test leads or their terminations if any Live earths may be encountered It is recommended that they wear appropriate rubber gloves rubber soled shoes and stand on a rubber mat m The earth elec
47. ormed 7 1 3 Z Zmax Zref and R1 R2 MFT1720 and MFT1730 only The right range knob has addition options Z Standard loop impedance measurements Zmax For multiple loop measurements where the worst case value is required Zref the Ze or Zdb value used when calculating the R1 R2 value R1 R2 The loop impedance less the Zref value For general loop impedance testing the Z seeing should be selected Refer to section 7 5 to 7 7 for additional functionality 7 2 Making a loop impedance measurement 7 2 1 Ze measurements at the origin Phase to Earth 1 Set the LEFT rotary range knob to the range 2 On the MFT1720 and 1730 set the RIGHT rotary knob to EH V V 1kV TRUE RMS MFT1710 MFT1720 and MFT1730 The MFT automatically uses the Phase and Earth terminals 3 Connect test leads as below with the Red test lead connected to the L1 Red terminal on the MFT and the Green test lead connected to the Green L2 terminal 15 4 Press the Function key lt gt to select the 2Hi mode The RCD will not trip so there is no need to use the 3Lo and 2Lo modes vni y TTT NiMH lt umm LI v 5 Press TEST to start the test sequence This can be automated in SETUP so the test starts when contacting the circuit See section 10 Setup 6 On completion of the test the display will show the loop resistance on the large display segments and the fault current on the small display segments UL 50 V TUN
48. re vii Select the Magnifying Glass symbol to start the pairing process 4 Push the Bluetooth Lock button again to start the pairing process the MFT will display D Once paired double click the MFT symbol on the PDA and enter the access key code 1234 6 The MFT will display the last three digits of your Bluetooth identity code when a successful pairing has been achieved e g 963 Bluetooth Pairing Windows Mobile 5 Smartphone 1 Set the MFT Range knob to the Bluetooth SET UP position 2 Press the Bluetooth Lock button on the MFT the MFT will show if no pairing exists or the last three digits of a paired identity if already paired If these three digits are the last three digits of your Bluetooth identity code e g 963 then you are paired with it If you don t recognise them or are unsure then continue with the pairing process 3 Select the Connections symbol i Turn on your mobile and press the left hand button to select Start menu ii li Select the Bluetooth symbol OO NON AAA Nor iv Press the right hand Menu button v Select the Devices symbol vi Select the Menu symbol and the select the New symbol vii If there are no paired MFTs shown then select Add 35 Note If there is a MFT symbol present check that it has the serial number displayed as your MFT If this isn t the case then delete the MFT from the PDA and continue with the pairing proced
49. rrent Bi directional test current allows the automatic testing of the circuit in both directions and the highest measured value being displayed See section 10 SETUP OPTIONS 5 1 Nulling test lead resistance up to 9 99 ohms Q Before starting a continuity test the test lead resistance should be nulled such that it does not add extra resistance to the circuit being measured Once nulled it does not need repeating for each test Periodically it should be checked to ensure nothing has changed The Lead Null value is retained even when the tester is switched off To null test leads 1 Short test probes or clips together and press the TEST button The null symbol O will be displayed to indicate lead null is active Lead null OFF This null value is stored until the TEST button is pressed again 2 To cancel the LEAD NULL separate the test leads and press the TEST button 10 5 2 Making a CONTINUITY measurement Set the Primary Left range knob to Q range The position of the right hand rotary range knob must not be in the f position 100 250 500 LUE Nc V VA a re TRUE RMS 2 Connect two test leads to the L1 ve and L2 ve terminals on the instrument A continuity measurement is made automatically NOTES Measurements are prevented when A resistance of gt 99 9 kQ is present Circuit voltages in excess of 4 V are detected 5 3 Storing downloading resul
50. s may be obtained from the UK address above or from Megger s website at www megger com 41 Megger Limited Archcliffe Road Dover Kent CT17 9EN England Tel 44 0 1304 502100 Fax 44 0 1304 207342 Megger 4271 Bronze Way Dallas TX 75237 1017 U S A Tel 1 800 723 2861 U S A only Tel 1 214 330 3203 International Fax 1 214 337 3038 Megger Valley Forge Corporate Centre 2621 Van Buren Avenue Norristown PA 19403 USA Tel 1 610 676 8500 Fax 1 610 676 8610 Megger SARL Z A Du Buisson de la Couldre 23 rue Eug ne Henaff 78190 TRAPPES France Tel 33 1 30 16 08 90 Fax 33 1 34 61 23 77 Megger GmbH Obere Zeil 2 61440 Oberursel Germany T 06171 92987 0 F 06171 92987 19 Megger Pty Limited Unit 26 9 Hudson Avenue Castle Hill Sydney NSW 2125 Australia T 61 0 2 9659 2005 F 61 0 2 9659 2201 E ausales megger com This instrument is manufactured in the United Kingdom The company reserves the right to change the specification or design without prior notice Megger is a registered trademark MFT1700 UG EN VO6 03 15 Wwww megger com 42
51. s the change in the circuit voltage from which the loop resistance is calculated For those circuits protected by an RCD the load that is connected Phase to Earth must be small enough not to trip the RCD Consequently there must be many tests performed to establish the loop impedance of the circuit These are automatically performed and the end result is displayed Test Lead Null The MFT does not need the resistance of the test leads to be nulled for this test They are already calibrated into the measurement circuit at 0 07 Q However if using fused leads or 3rd party test leads the resistance of these leads may be different In this case they can be measured using the continuity test and the resistance can be compensated for in the SETUP options see section 10 13 Circuit connection The MFT is designed to test the L PE and the L N and L L part of the circuit Selecting the L PE range on the MFT will enable testing of the Live to Earth circuit as below 7 1 Range selection and test leads 7 1 1 Phase to earth L E circuits The main range knob and test leads should be connected as shown L 250 5990 MQ LOOP vs ps E DNE RCL snp Neo R2 TRUE RMS On the MFT1720 and 1730 the right hand knob should be set to Z Connecting the 3rd Blue lead enables the 3 wire loop test 3Lo as below and reverse polarity detection Test Options in L PE mode In L PE mode the MFT1700 series offer 3 types of loop test 3Lo
52. ssssssssssssssseesenenenene meme nmnmmnn n nnnnnnn nnn n nnn snn sinere sini nnns 37 Ga gs olere Ies HO TR PEE TE Em 38 iis wc AN dd s IRI oo E OE N A E A A A EE T O E A 41 AN SAFETY WARNINGS Safety warnings and precautions must be read and understood before the instrument is used They must be observed during use m The circuit under test must be switched off de energised and isolated before test connections are made when carrying out insulation and continuity tests m Continuity of protective conductors and earthed equipotential bonding of new or modified installations must be verified before carrying out an earth fault loop impedance test RCD or earth testing m Do not touch circuit connections and exposed metalwork of an installation or equipment under test Under fault conditions the system earth could become hazardous live m Do not touch the earth stakes test leads and their terminations including connections to the earthing system under test if an installation earth fault can arise unless adequate precautions are taken m The live circuit warning and automatic discharge functions are additional safety features and should not be regarded as a substitute for normal safe working practices m Do not move the rotary switch positions while a test is in progress m Do not operate the instrument or connect it to any external system if it shows any visible signs of damage or if it has been stored for prolonged periods in unfavour
53. ssssssssssssssssssseeen nee eee hehe nene rnn nnn n nni h nnn nnns sss esas n inner nnns senses sana nas 22 el Makngan rcd Meas NE oeiia a a akei ie e o Re e kakain aneii aeaiaioii 23 G2 SEENE RCD NPE erine EEEE EE TA EEE EEE EE A E EE EEA EEE AEREA 23 83 JoxtBCD Current Rating NOG TSE zussesncciesuttiunsaaunconbatsic nauta usa EEEE AE EAEE RaR HAE ROE aE SEEE ARORAA REE RAAE EE 23 g4 Tx RED Current Rating nipping teston SO is IRE sena cap tua amde penetra Sues edidi ttt au Ret tt ruth mc tied inta 24 8 5 b5x RCD Current Rating Tripping test on 30mA RCD c ccccccccccceccssessecececeeeececcauseeeeceeeceeseseeaseeaeseceeceeeesseeaannseess 25 ono iic E E ste AT A E EEA E 225 gU ci ig db 26 S MEME A Qu MINI dbni EE 26 29 0 0 ML Ol Be NOMET IT TO RTTE 27 AE ODG blc T E 27 MT a P ERODI UMOR m EE E E E E E EEE 27 Cele TOUCH VOe AEP y eee Oe 29 8 13 Measurement methods and sources of error ccc ceccccccccccccc cece ee eeeeceeeeee ceases e heeeeee enn n hhh nene sn nnn ns ii e nnne sess essaie sai rrr nnn nnns 29 cS mm 29 SNMEESO I io DEUTLICHE A E EE E E E EEE EESE 29 SNAM TTE O NET 29 9 4 Making a measurement Three terminal resistance measure
54. strument has been set for Type B test but Type B test is not valid with this setting ERR Type S breaker symbol Instrument has been set for Type S test but Type S test is not valid with this setting ERR HI mA On VAR range current is set too high for the selected test 11 10 Loep Test Supply tripped unexpectedly 50V Test aborted due to danger of exceeding touch voltage limit Err con Hardware problem detected during High Current Loop test or RCD test hot Internal resistors are too hot Also shows thermometer Kae Internal heat sink is too hot Also shows thermometer Supply noise detected Loop test time will be extended 11 11 Test will not start CON Wrong connection to instrument Por Internal resistors are too hot Also shows thermometer Hot Internal heat sink is too hot Also shows thermometer VOL 280V for example Supply voltage is too high L N 48V for example Voltage on terminals is too low for L N loop test L E 48V for example Voltage on terminals is too low for L E loop test or rcd test FRE 45 Supply frequency is too low for loop test or rcd test FRE 265 Supply frequency is too high for loop test or rcd test NO REF Loop R1 R2 test attempted without having previously done a Zref test Appendix A Sending Storing Deleting and Recalling Test Results 32 Test results can be stored in the MFT or downloaded immediately to a Bluetooth compatible device
55. t option This will be the connection for some tests Insulation Continuity Loop L L L N or Job number for other tests 5 Use the Right Lock RIGHT TEST buttons to scroll through the values until the one you need is reached 4 Press and release the Bluetooth Lock button again to display each of the remaining options Job Distribution Board Circuit Phase and use the Right Lock RIGHT TEST buttons to change these values as required D To complete the store press and hold the Bluetooth Lock button until Str Ok is displayed Notes jm If a particular option does not need to be changed from the value set during the previous stored result it does not need to be displayed prior to storage 2 The only available option for stored Earth test results is the Job number Deleting Test Results from the internal memory Turn the RIGHT rotary range knob to the DEL range Use the Bluetooth Lock button to select either LSt last stored result or ALL all stored results Press and hold the Bluetooth Lock button until no is displayed Use the Right Lock RIGHT TEST buttons to display YES Press and hold the Bluetooth Lock button until dEL Ok is displayed Pe ur rs Recalling Test Results to the display 1 Turn the RIGHT rotary range knob to the RCL range 2 Use the Bluetooth Lock button to select either LSt last stored result or ALL all stored results 3 Press and hold the Bluetooth Lock button until the resu
56. trode under test should be isolated from the circuit it is protecting before testing commences If this is not possible ART attached Rod Technique may be used to measure electrode resistance m The instrument terminals should be connected to the system under test through isolation switches that are rated to handle the likely maximum fault voltages and currents that could be encountered at the installation The isolation switch must be open whilst any personal contact is made with the remote test stakes or the connecting leads e g when changing their position m The instrument terminals should be connected to the system under test through fuses that are rated to handle the likely maximum fault voltages and currents that could be encountered at the installation NOTE THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS Users of this equipment and or their employers are reminded that Health and Safety Legislation requires them to carry out valid risk assessments of all electrical work so as to identify potential sources of electrical danger and risk of electrical injury such as inadvertent short circuits Where the assessments show that the risk is significant then the use of fused test leads constructed in accordance with the HSE guidance not GS38 Electrical Test Equipment for use by Electricians should be used This instrument is internally protected against electrical damage when used for the purposes of testing low voltage el
57. ts MFT1730 only For full details see Appedix A and B Once the display shows a value it will automatically be logged into temporary memory Unless stored this will be over written by the next measurement To store this result or to send it to a PowerSuite compatible device refer to Appedix A and B 5 4 Continuity Buzzer ON OFF Whilst in the continuity range press the MODE button J This will toggle the buzzer ON and OFF BuzzerON m Buzzer OFF No symbol 5 5 Switch probe SP5 In the CONTUNUITY RESISTANCE mode all measurements can be made with the remote switch probe SP5 Tests are automatic and do not require the TEST button to be pressed K Connect the switch probe to the switch probe socket L1 ve The switch probe replaces the standard RED test lead Test as in 5 2 above 11 5 6 Buzzer threshold If the measured resistance is less than the buzzer threshold the buzzer will sound The resistance at which the buzzer stops sounding can be changed to meet individual test requirements Refer to the SETUP section 10 of this guide Selectable limits of 0 5 Q 1 O 2 OQ 5 OQ 10 O 20 0 50 0 100 Q depending on model are available This setting is stored even when the instrument is switched off 5 7 Measurement methods and sources of error Method of measurement The 2 wire lead set must be used for this measurement A d c voltage of nominally 4 4 V with a current limit of 2200 mA is
58. ure 4 Push the Bluetooth Lock button again to start the pairing process the MFT will display 5 On the Windows Mobile 5 once paired select the MFT symbol on the mobile and enter the access key code 1234 6 The MFT will display the last three digits of your Bluetooth identity code when a successful pairing has been achieved e g 963 7 On the Windows Mobile 5 press the left hand menu button four times to select the following in sequence Next OK Next and Done 8 Continue to press the left hand button until you return to the windows desktop display Bluetooth Pairing Palm v5 UR Set the MFT range knob to the Bluetooth SET UP position 2 Press the Bluetooth Lock button on the MFT the MFT will show if no pairing exists or the last three digits of a paired identity if already paired If these three digits are the last three digits of your Bluetooth identity code e g 963 then you are already paired with it If you don t recognise them or are unsure then continue with the pairing process 3 i Select Bluetooth from the main Palm desktop and ensure is turned on il Select the Setup Devices symbol iii Select the Trusted Devices symbol iv Select the Add Devices symbol Note If there is a MFT symbol present check that it has the serial number displayed as your MFT If this isn t the case then delete the MFT from the Palm and continue with the pairing procedure 4 Pus
59. ures 230 Vac on a separate electrical source prior to measuring the circuit to be tested and then checking it at the end of testing a live circuit is less likely to be mis reported as dead The Megger MTB7671 test box is available for checking all electrical functions of the multi function tester excluding earth tests between calibration dates 36 Appendix E Cleaning and maintenance The MFT1700 should only be opened or repaired by an approved Megger service or by Megger Instruments Limited To clean the instrument use a damp cloth or isopropyl alcohol if available To clean the display window only use a lint free cloth For repairs and warranty see page 40 Appendix F Earth resistance testing Basic principles F 1 Principle of operation three terminal resistance measurement The classic fall of potential test is used to accurately measure the resistance of an earth electrode using auxiliary stakes driven into the soil which form a circuit for the test current injection and voltage measurement as used for the two terminal method The MFT injects an a c current of known magnitude into the system under test and measures the voltage developed across it as shown in Figure 4 The system resistance is a simple ratio as per hm s Law In this case the potential stake is moved by fixed increments in a straight line between the electrode under test and the current stake At each location the resistance is calculated as RZV I A graph of
60. will show the Zref value UL 50 V TL JEEND du Q R1 R2 LI L 7 8 Measurement methods and sources of error Method of measurement During a loop test the instrument measures the difference between the unloaded and loaded supply voltages From this difference it is possible to calculate the loop resistance The test current will vary from 15 mA to 5 A depending on supply voltage and the loop resist ance value The volt drop from a 15 mA load is exceptionally small consequently the instrument performs many measurements auto matically This test takes a long time to complete typically 20 seconds Possible sources of error The reading depends on the stability of the supply voltage during the test Therefore noise harmonics or transients caused by other equipment during the test could cause an error in the reading The instrument will detect some sources of noise and warn the user It is recommended that more than one test is performed on the circuit to ensure the measured value is repeatable especially when performing a 3Lo measurement Capacitive loads across the Phase Earth circuit can affect the accuracy of the Non trip loop test For this reason the P E non trip loop test should not be used on the P N circuits Errors can be reduced by M Use the two wire lead set with prods and making a firm connection to clean conductors E Make several tests and taking the average E Ensure that potential sources of noise in th

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