1-Service Manual LT3XX RCDT3XX LRCD2XX
Contents
1. 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 TP250 TP251 TP252 TP253 TP254 TP255 TP256 TP257 SK1 Volts L N Volts L E 4m Volts N E 4m Volts L E High Gain ST Volts N E High Gain 8146 TEMP TR 4m TEMP R 4 8 Sense 4m SPARE 81410 DAC 4m ENABLE LOOP TEST 4m DACI AI 14 1x10 4m L N FIT 4 16 N E FIT 4m RELAY N E 4 18 RELAY L N an 2 gt 5V gt 0V A Hz rra T gt 15V T a i gt 5V_SWITCHED AM E213 V TP283 ALI 28 ALJ 29 gt Qv S 284 Volts L N Volts L E Volts N E OO OO OOOO OOOO OOOO OOOO OOO OO Volts L E High Gain Volts N E High Gain TEMP TR TEMP R Sense SPARE DAC x2 I ENABLE LOOP TEST Volts L N Volts L E Volts N E Volts L E High Gain Volts L N Volts L E Volts N E DAC 1x10 Volts N E High Gain L N FIT N E FIT RELAY N E RELAY L N g2. 94 E R99 D79 DBO 082 2 z B R101 18297 f 18298 F 4 o m RIE 4 me F 1 L R110 MEE 9199 7 500 F 1 8 L qoM K 4_R301 g 9 4 pee H mE R100 T 3 05 B m E E i EF E mam SXI H E m L 071 izi mq E a cm E p g E mp un R267 5 lt le Ew AM aut P m Eu geo E pea D70 B rv 118 Ines 072 vw 4 R272 H T oo 4 7 R114 TUS ONUS Ue R251 ae E 4 Ro 3 T O R247 2 Dus m Wt m 8 y H2 R243 1 BAR_CODE_LABEL_CON BAR_CODE_LABEL_SM _
3. Sheet 4 of 10 4 2 1 FILTERED 5V FILTERED 5V R89 10 00K 1 0 063 R91 Volts N E L gt Volts L N Volts N E Shifted gt Volts L N Shifted 10 00 10 00K 0 063 TP183 0 063 TP185 TP186 FILTERED 5V R93 10 00K 45V 1 0 063 R95 Volts L E gt Volts L E Shifted 0 063 10 00K C85 1 100 00n FILTERED 5V 0 063 25 C20 100 00n 25 TP188 0 lt Design gt Me er MEGGER LIMITED Document Number Archcliffe Road Dover gg 1 Kent CT17 9EN England 6270 290 Title Level Shift Instrument LT RCDT3xx Issue Date CN No Drawn By Chris Wedge 4 11 06 04 22036 Date 3 05 05 04 22007 MEGGER LIMITED ize Sheet 5 of 10 K A 9 5V TP27Q gt BXD1 LKD3 A SEG1 6 BP 1 5V BACKLIGHT DRIVER SEG2 BP 2 A TP TXDi R116 SEG3 4 BP3 Ho 10 00R BATTERY VE SEG4 4 BP4 27 RXDO 1 0 063 5 5 SEG32 0V D ovis Buzzer SEG6 8 SEG31 270 TXDO SEG7 0 5 030 WD1 SEG8 8 9 SEG29 45V LL4148 SEG9 9 8 SEG28 5V D20 SEG10 10 SEG27 1 0 063 SEG11 G SEG26 2 20K TP53 5V SEG12 SEG25 SEG13 4 SEG24 SEG14 14 SEG23 face 5 5 SEG22 C BACKLI
4. 28 4 28 BATTERY VE TEST POWER ON SH LD VCC CLICLK INH 74HC165 TEST_KEY_POWER_ON 5V 0 063 KEYS DATA TEST KEY 5V a SH LD VCC CLICLK INH gt CONFIG DATA Core Design M MEGGER LIMITED Document Number egger crite noza Dover 6270 290 Title Keys amp Config Instrument LT RCDT3xx Drawn By Chris Wedge 11 06 04 22036 35 05 05 04 22007 MEGGER LIMITED Sheet 3 of 10 LINE NEUTRAL ON NEUTRAL_EARTH ON LINE EARTH ON LED INDICATOR LED INDICATOR LED INDICATOR 5V 5V 5V R83 1 00K 1 0 063 TP42 TP39 A TP296 TP40 mds R86 TR12 LI BCW32 Citi 100 00n 470K 25 00 1 0 063 V 0 0 0V D R327 D 10 00K TS 1 100 00 0 063 100 00n DIFF_SELECT 1 3 DIFF_SELECTI1 3 25 00 Pose Pas 25 00 10 00K 10 00K 1 1 TP45 A V 0 063 0 063 OV D 5 OV D A TP47 TP48 267 TP268 TP269 R88 u LEDDATA gt 2 1 0 063 11 DIFF SELECT3 TP182 0 ZC SELECT1 C18 9 I o 100 00 49 8 25 Q C19 i 100 00n 25 LED CLK gt V OV D ZC SELECT 1 2 zc SELECTII 2 Core Design MEGGER LIMITED Document Number Megger Archcliffe Road Dover 6270 290 Kent CT17 9EN England LEDs and Shift Register Instrument LT RCDTSxx Drawn By Chris Wedge 11 06 04 22036 Date 3 05 05 04 22007 MEGGER LIMITED Size
5. with model DO NOT SCALE IF IN DOUBT ASK DIMENSIONS IN MILLIMETRES ISSUE DATE Maira plate marked with model name THIS IS A COMPONENT DRAWING AND THE TOLERANCES SHOWN TOLERANCES UNLESS STATED i REFER TO THE COMPONENT AND NOT ITS ASSOCIATED TOOLING NOMII 6 11 01 2005 MEGGER LIMITED TO 1 DECIMAL PLACE 305 Finish Reproduction in whole or part without prior permission from the copyright owner is strictly prohibited HOLES TO BS4500 H11 5 02 07 2004 Date 23 03 2004 See BOM Title Part No Instrument Assembly 6411 095 Tri socket 1st Used LT RCDT300 Series amp LRCD200 Series Scale 1 1 Sheet 2 of 2 Black Wiring Remove protective film from Icd and from LT310 both sides of the window before packi g ed ed Green Green RCDT310 RCDT320 RCDT330 LRCD200 LRCD210 LRCD220 USB PCB Connection Battery connection W1 amp W2 RCDT320 shown as example Note LT310 uses Case Kit A with one range switch Pack instrument in blister with lid in position shown 0000 00 0000 For French German amp Spanish or Dutch for LRCD models fit language variant label Green Fit Sleeve S1 over W7 starting this end Stick to top f
6. E 1 m Description USB PCB MIT LT RCDT3 IC EEPROM 8Kx8 24C64 SO8 IC REGULATOR 3 3V LM117DTX TRANSISTOR NPN DRG 6180 39 DIODE SM LL4 CAP SMD CER 100nF 10 18 CAP SMD TANT 10uF 20 35 CAP SMD CER 22pF 10 060 CAP SMD TANT luF 20 222 RES SM 10M MF 10 1 8W 1 RES SM 33R MF 1 0 063W RES SM 1K MF 1 0 063W RES SM 1K5 MF 1 0 063W RES SM 10K MF 1 0 063W RES SM 100K MF 1 0 063W RES SM 1M MF 1 0 063W RES SM 30K MF 1 0 063W RES SM 220R TF 1 0 063 0 CRYSTAL 12MHz HC49 4H IC USB TO SERIAL CONVERTER PCB BAR CODE LABEL LABEL CUSTOM 6 35X24mm RES SM 100R MF 1 0 063W HEADER 72 PIN DIL SOCKET USB B TYPE PCB MTG ISOLATOR 10KV OPII WACL USB MAIN PCB MIT L MIT pin 1 Red this end BOM ARTETCH CIRCUITS LTD ARROW ELECTRONICS LTD EURODIS HB ELECTRONICS EURODIS HB ELECTRONICS ANGLIA WELWYN COMPONENTS LTD WELWYN COMPONENTS LTD WELWYN COMPONENTS LTD WELWYN COMPONENTS LTD WELWYN COMPONENTS LTD WELWYN COMPONENTS LTD WELWYN COMPONENTS LTD ARROW ELECTRONICS LTD MICROMARK ELECTRONICS LTD ARROW ELECTRONICS LTD EBV ELECTRONIK GMBH TYCO ELECTRONICS UK LIMITED WELWYN COMPONENTS LTD TOBY ELECTRONICS LTD ARROW ELECTRONICS LTD FARNELL ELEC COMPS LTD MICROMARK ELECTRONICS LTD MICROMARK ELECTRONICS LTD MICROMARK ELECTRONICS LTD MICROMARK ELECTRONICS LTD LT RCDT pin 1 this end Qty L
7. CLIP IN 3 25980 056 RELAY SP 250 VAC 8A 5V RELAY SINGLE POLE C O 250 VAC 8A 5V COIL 1 26836 077 RES 33R MF 2 0 75W RESISTOR METAL FILM 1 26836 706 RES 100H WW 5 12W 1 26837 116 RES 100R FUSIBLE 5 7W RESISTOR 100 00R TOL 5 7 0 WATT WIRE WOUND 1 26837 130 RES 10MO MG 196 0 5W RESISTOR 10M 196 0 5W 2500V METAL GLAZE 10 26837 134 RES 390K MG 5 0 5W RESISTOR 390K 5 0 5W 400V 1 26837 175 RES 3R3 WW 1 3WP RESISTOR WIREWOUND PRECISION 2 26900 008 RES 20RO MF 1960 25W RESISTOR 20R 196 0 25W 2 26900 029 RES 150R0 MF 1960 25W RES MF 150R 1 25W MFR4 2 26900 188 RES 1R3 MF 1 0 25W RESISTOR METAL FILM 2 27920 039 ZENER TVS 600W 440V UniDir TRANSIENT SUPPRESSOR 600W MS VBR 440V CB417 2 28863 078 ZENER 0 4W 5 15V 0035 BZX ZENER DIODE 15V 0 4W 1 28863 082 DIODE 1N4007 1A 1000V 12 28863 160 DIODE 1A 1000V BA159 DIODE 1 29650 006 TRANSISTOR NPN MJF31C TRANSISTOR NPN N CHANNEL MJF31C 1 25925 004 WIRE LINK BARE 0 6mm DIA WIRE LINK 0 6mm DIA CU TINNED BANDOLIERED 1 13489 326 WIRE 1 0 6 PTFE WHITE 1 0 6MM H C COPPER WIRE 0 08 21189 015 STUD M3x12LG SELF CLINCHIN STUD M3x12LG SELF CLINCHING 2 21813 304 WASHER CRINKLE BER Cu M3 CRINKLE WASHER TO BS 4463 2 21810 601 NUT FULL STEEL M3 FULL NUT HEXAGONAL TO 2 18760 013 ADHESIVE SEALANT 744RTV 31 ADHESIVE SEALANT 744RTV 0 5 5131 418 HEATSINK 2mm LT300 HEATSINK TO DRG ISS 1 1 2
8. D71 D72 M er MEGGER LIMITED Document Number renciite 3 SW18 amp SW19 PL24 PL25 Kent 17 9EN England 6270 290 Title ZERO CROSSING Circuit Instrument Loop Tester Issue Date CN No Drawn By Rongkai Xu 4 11 06 04 22036 Date Tuesday October 21 2003 3 05 05 04 22007 MEGGER LIMITED ize Sheet 10 of 10 2 1 Volts L N Volts L E Volts N E 4m 4 Volts L E High Gain Volts N E High Gain 4m 6 TEMP TR TEMP R 4 g Sense ALI 9 SPARE ki DAC 4m Enable Loop 4m DAC AI d 14 1x10 4 RLN fitted Ci RNE fitted 4m NorE ki l 5 gt 5V gt 0V A 4n OVID RLN fitted ay DAC TT 5 415V RNE fitted DAC x2 T gt 15 I Enable T D gt 5V_SWITCHED 4m 8 Relays 0 gt 0V S Current Source E 79 2 Temp Measure 2 i 2 Line Line LN TEMP TR D Volts L N TEMP R D Temp TR Neutral Temp TRIB Temp R h Gain Neutral Temp R h Gain TEMP TR D TEMP R D Earth Temp Measure z Sense Sense 5 S PL3 Current Source Relays gt PL4 5 E j PLS 5V_SWITCHED Measurement Volts Lp 29S LEN Line E Volts Lep Volts nep NE Neutral Volts L E High Gain P Volts L E High Gain Earth Volts N E High Gain P Volts N E High Gain Measurement lt Variant Name gt MEGGER LIMITED Document Number Archcliffe
9. gt Volts N E 5V 100 00pF 50 241 5V 5V C86 C87 C88 100 00n 100 00n 100 00n 25 25 25 89 C90 C91 OV S 100 00n 100 00n 100 00n 100 00pF 50 R96 BTOB 0 063 0 063 24 100 00 50 I gt Volts L E High Gain C28 100 00pF 50 p R109 470 00K ows 1 0 063 R111 1000M 0 5 R114 0 5 Neutral Cc e 10 00 1 7 oe 0 063 C30 100 00pF 50 P lt Variant Name gt Volts N E High Gain MEGGER LIMITED Archcliffe Road Dover Kent CT17 9EN England Document Number 6270 289 25 LT RCDT300 series Power PCB Instrument LT3xx RCDT3xx Drawn By Rongkai Xu Chris Wedge mmm Date Monday October 20 2003 3 11 06 04 22036 5V MEGGER LIMITED Size Sheet_3 of 6 R A p 1 1 5V TP153 R190 x4 7 TP110 0 063 R239 R192 gt Temp R 1 00K 45V TEMP 0 gt 0 063 Temp R is two diode junctions attached to the power resistors Would 10 00K expect a voltage about 1 2V changing by 4mV C We could expect 1 D66 tempertures in the range 10C cold no test to about 100C a range 0 063 LL4148 R195 R196 15 00K 1 00M of about 1 1V 1 5V 1 1 0 063 0 063 ovia TP115 TP257 45V TP155 TP156
10. 063 D75 P6KE440P OV A TR45 Current Source VE lt LOOP 0 063 MMBF0201NLT1 TP208 TP244 TP245 115 Not Fitted R327 10 00nF LI 50 OV A 10 00K 1 0 063 ic D97 LL4148 lt 11 46 2 REDE 7 rLos4cb 0 063 s 1 3 D98 114148 R272 3 30R 1 3 TP239 TP172 15V 45V SWITCHED DG212CJ C105 100 00n 25 C106 100 00n 25 OV A 15V R278 10 00K 0 063 TR40 MMBF0201NLT1 lt Variant Name gt MEGGER LIMITED Document Number Megger mmm nad land LT RCDT300 series Power PCB Instrument LT3xx RCDT3xx Drawn By Rongkai Xu Chris Wedge Date Monday October 20 2003 3 11 06 04 22036 6 of 6 MEGGER LIMITED Size Sheet Bill of Materials Instrument Assembly RCDT LT amp LRCDs Megger Part Description Qty Number LT310 320 PWR PCB ASSY RE PCB Assemblies need to be exchanged as a pair Contact 1 LT320 RCDT320 DISPLAY PCB us with instrument serial number for further details 1 6140 377 WACL LT RCDT300 RANGE Cut wires set 1 6231 723 CASE KIT B 2 SWITCHES 1 CASE KIT A 2 SWITCHES to Drg Iss 3 1 5310 446 TERMINAL PANEL MIT LT RCDT TERMININAL PANEL TO DRG ISS 1 1 25965 099 SOCKET 4mm DIA SOCKET 4MM DIA BRASS NICKEL PLATED 2 5310 357 INDEX SPIDER SWITCH T
11. A oe TP278 C121 C 27 1C32 1 AC 062 x 4 3 GAIN 10 00nF OV A R47 Vloop AC 4 37 3 50 00 1 00 R49 100 00K R50 100 00 1 D16 0 6 TP131 1 0 063 1 0 063 0 063 FN 114148 TP28 a HEN gt v Rg OUT TP290 5V Tk lee PHASE R51 33 00K 1 AD622AR TP279 R54 1 0 063 8 SENSITIVE R325 10 00K 0 06 3 Rg2 REF DETECTOR 00K 1 0 063 0 063 Ve o 282 TP30 v 5 5V R59 TP32 R60 DEE SELECTS 10 00R 1 00M TP33 5V 1 1 291 0 063 0 063 V A 0 OV A B co sw R48 co 15 100 00K 1 15 1 1 R61 R62 R63 4053 0 063 10 00R 1 00M 100 00K 25 00 1 1 TP36 TP134 0 063 0 063 T Viso As TP37 1 53 1 sw H s 5V D 100 000 OV A 3 4 P56 SELECT LOOP SOURCE nos 1 00 0 06 C10 DIFF SELECT 1 3 10 00nF 50 SELECT INPUT 45V FOR LOOP o V 45V TP38 0V S OV D 15V C8 100 00n C16 25 Volts L N 100 00 Volts L E A Volts 52 lt Core Design gt Volts L E High Gain 100 00n OV A ARN ov b 5 MEGGER LIMITED Document Number Volts N E High Gain Megger Archoliffe Road Dover 6270 290 C17 Kent CT17 9EN England pe LOOP MEASUREMENT _ LOOP MEASUREMENT Instrument CM450UK V 5V SV Drawn By KF OG RH pp ee Date Monday October 20 2003 of 10 MEGGER LIMITED Size A3 Sheet 2 0V D ol SWK2 SWK3 coos SWK4 eles SWK5 oie 42 4
12. DW BN WHR NR BOB_IIDE ABOL 488
13. EAS diagnostic test keys east right key pressed ESC escape fomr storage screen EEP diagnostic test eeprom transmit contents EXY error number XY 2 digit error number eXY error number XY 100 Hot FET too hot for test to proceed hot resistors too hot for test to proceed INV invalid result which cannot be stored kEy diagnostic test keys LEF diagnostic test keys left hand key pressed LIN diagnostic test Links L L line line connection L N line neutral connection L L LN swap setting LN swap tests allowed L N LN swap setting LN swap tests not allowed NEU neutral fault NOC no calibration calibration failed NOR diagnostic test keys north up key pressed NOS no shutdown mode selected noS noise on supply nXY wire number N E neutral earth connection OFF diagnostic test switch off OFF switch off imminent OK ok acknowledge of result stored or deleted Pot diagnostic test balance pot set up PX phase number PXY diagnostic test ad converter port number REF reference value not set before doing R1 R2 loop test RIg diagnostic test keys right hand key pressed RS P diagnostic test rotary switch primary RS S diagnostic test rotary switch secondary Snd send SEt set up menu SOU diagnostic test keys south down key pressed SPA diagnostic test keys spare key pressed tES test mode s
14. In the Dover factory instruments are calibrated and tested automatically using a PC Manual calibration is not possible contact ukrepairs megger com for details of the options available This is a Manual test procedure for the RCDT310 RCDT320 RCDT330 LRCD200 LRCD210 amp LRCD220 instruments Note that some instruments allow for Neutral and Line to be swapped and the tests need to be repeated in this configuration Switch instrument on battery voltage 12V measure battery drain lt 50mA after 5s Switch instrument to V connect voltages as indicated and read display L N L PE 230V 50Hz 230 6V L N L PE 440V 50Hz 440 10V L N N E 240V 50Hz 240 6V Test Currents The no trip 1 21 current can be measured not LRCD200 as follows 1 Connect a c current meter to measure the current following in the circuit Line to PE 2 Select the RCD Rating and 1 21 RCD Test 3 Meter should read about 0 5 0 75mA Press the test button and the reading on the current meter will vary until it stabilizes to a reading Do not use peak hold The trip D current can be measured as follows 1 Connect a c current meter to measure the current following in the circuit Line to PE 2 Select the RCD Rating and I RCD Test 3 Press the type button and the display should brief display AC S Since the instrument is now set to selective the test current will flow for two seconds 4 The meter should read ab
15. P Level Shift KEYS CLK CONFIG DATA 1 Range Switches RANGE A RANGE B RANGE LEDS 2nd FA Ses 2nd F B sw orci Sw OFF Range Switches LEDs TEST KEY TEST KEY POWER ON Keys amp Config TEST KEY POWER ON LEDs Core Design DIFF SELECT DIFF 3 3 ZC SELECTI1 2 7 sELECTi 3J l MEGGER LIMITED Archcliffe Road Dover Kent CT17 9EN England Display Board Block Diagram Document Number 6270 290 LT RCDT3xx Chris Wedge Instrument Drawn By Date MEGGER LIMITED 11 06 04 22036 3 05 05 04_ 22007 Size Sheet 1 of 10 5 4 TP153 9 2 1 TP285 LOADED gt 4 w ow TP154 S 45V M D 61940 DIFF OUT UNLOADED gt PC Q TP132 Vn C110 TP155 74HC74 74AHCT1G86GW R D S 10 00nF ZERO VCC 50 00 TP157 GND yH TP264 1 5 6 114148 v D IC10 2 ZERO CROSS ae Q 30 00K oV A TP26 VCC bs R330 1 GND 30 00 0 063 1 00 x1 or x10 Gain 74AHCT1G86GW 0 06 TP281 ZERO CROSS SELECT XORGATES Ta Ras DIFFGAIN gt OV D Q 22 0 USE ZERO CROSS 1 TR34 1 USE ZERO CROSS 0 063 R45 5V 1 00M V 2 ov s TP25 0 063 A D15 i FD 114148 5
16. Road Dover Kent CT17 9EN England 6270 289 LT RCDT300 series Power PCB Instrument LT3xx RCDT3xx Drawn By Rongkai Xu Chris Wedge 2 26 4 04 21993 Date Monday October 20 2003 MEGGER LIMITED Size Sheet 1 of 6 RL1 114148 SK9 SK10 i A L N 2 32mm FUSE MEN R186 gt fitted LorNL__ gt BCW32 3 00K 1 0 063 108 R187 1 00 1 0 063 SK12 0V D SK11 FS3 5V Neutral C E A A D59 2A 32mm FUSE RL27 L4148 loss x ne 0 V A gt RNE fitted R188 TR29 N or E BCW32 3 00K 1 ae 6231 734 Fit Fit Fit 0 063 109 1 00M LT3xxR 6231 735 Link 2 5 Fit Fit 063 RCDT3xx 6231 736 Fit Link 2 5 Fit RCDT3xxR 6231 737 Link 2 5 Link 2 5 No Fit lt Variant Name gt Veggen SES ome Archcliffe Road Dover OV D 00 1 Kent CT17 9EN England 6270 289 Ute LT RCDT300 series Power PCB Instrument LT3xx RCD T3xx Date Monday October 20 2003 MEGGER LIMITED Sheet 2 of 6 C23 100 00pF 50 P Line gt Volts L N Neutral 100 00pF 50 27 100 00 50 p R108 0 5 0 063 R110 Line TUUM 0 5 gt Volts L E R112 COE R113 0 5 0 063 29 100 00 50 22 100 00 50 R97 Neutral Earth
17. 0 00n TP87 TL5001ACD LL4148 0 063 25 00 LL4148 gt R22 3 BCF29 THES uM j 8 x 1820 TP189 Ton m R155 ov P 4 300 00R R303 TR21 gt d C104 46 49 TP306 i 10 00uF 2 100 00 TEST_KEY_POWER_ON Jet D24 5 25 16 PULSE HI TO 300 008 5 bd TURN ON 1 gt oO 0 063 TR31 E R158 TP307 S POWER OFF m lt 10 00nF 30 00K E 50 00 1 C52 OFF 0 063 Tee 10 00nF 50 00 52 05 V OV P C105 30 00K 10 00uF 1 D27 16 0 063 m TP308 A 339 LL4148 V NMI CIRCUIT Y 5V R232 25 4 TP190 15 30 00 A 0 063 100 00 R161 25 D66 100 00K 4 B TP151 0 063 BAV99 C42 ov P TP309 2 5V_SWITCHED 220uH 065 101 114148 TES D IN Vin 50 00 INCUR LIM y OSC COL Wo R165 R166 GND EMIT ov P 100 00K 7 50K LM2528A TP311 107 00 10 00uF ru 1 2 1000 C108 50 mm 0 063 0 125 T 60 10 00uF C59 ZA 33000pF 50 een 50 00 114148 0 063 SZ 230 LKD1 5V SWITCH FOR 15V 45V TR25 5V SWITCHED SUPPLIES LKD2 C109 NDS352AP 1 2 ov P 10 00uF 100 00n 50 25 D31 C62 LL4148 A 10 00nF 50 Core Design 15V M er MEGGER LIMITED Document Number Archcliffe Road Dover egg 1 Kent CT17 9EN England 6270 290 TP105 ove POWER SUPPLIES Instrument LT RCDT3xx Date 3 05 05 04 22007 OMEGGER LIMITED Size Sheet 7 of 10 A Q D 4 SW OFF These LEDs ar
18. 00Ncm Do not fit disc amp spring to bottom side of upper switch Torque 30Ncm Fit after programming Cut hole for USB socket using Punch AT22181 Silver contacts USB socket assembly order J this side up 1 Fit usb cover into terminal panel 2 Attach usb pcb to main pcb with spacer 3 Rotate usb pcb into usb cover Use Heatsink i 4 Screw usb pcb to terminal panel AT22180 when soldering 7 wires to sockets FSIS 27 Fold 90 on each 47 zl crease line 37 5 lt 2 Torque 75Ncm 3 Pass wires through UU ELS battery contact holes Ensure that switch spiders are correctly Upper Switch Pin Positions and solder In plage m engaged in case top and range knobs Model Pin 1 Pin 2 p WX before screwing pcb in place LT310 N F N F i lt NS D Ensure no gap LT320 SS t Wipe switch detents with Z at ends when terminal LT330 Bend battery contact gt Z x special plastics grease Item 16 panel is fitted RCDT310 tabs as shown vA RCDT320 RCDT330 LRCD200 LRCD210 LRCD220 Lower Switch Pin Positions Model Pin 1 Pin 2 LT310 LT320 LT330 RCDT310 RCDT320 RCDT330 LRCD200 LRCD210 LRCD220 Use front panel nest AT22185 gt gt K c r xr Fit to LT RCDT330 only Pins Item 14 to protrude 2 5mm Use Press AT22182 usin Megger Ltd Archcliffe Road Dover Kent CT17 9EN U K AINT Drawn By S D Clark
19. 2 A W Ed A4 1 30000 015 C DUAL MONO 74HC123 NOT DESCRIPTION IC DUAL MONOSTABLE 1 30000 052 OP AMP J FET 062 INTEGRATED CIRCUIT BASE NO 062 LOW POWER J FET 3 30000 055 OP AMP PRECISION OP07CS INTEGRATED CIRCUIT PRECISION OP AMP BASE NO 07 1 30100 017 ANALOG SWITCH SPSW DG21 DESCRIPTION IC ANALOG SWITCH SPSW DG212BD 1 31000 001 TRANSISTOR NPN DRG 6180 39 TRANSISTOR 5 31000 002 DIODE SM LL4 DESCRIPTION DIODE LL4148 75V 150mA 15 31000 003 C OP AMP QUAD LM INTEGRATED CIRCUIT QUAD OP AMP 1 31000 005 COMPARITOR TAPE LM DESCRIPTION IC QUAD COMPARITOR 1 31000 018 OP AMP JFET QUAD TL064 IC QUAD OP AMP JFET TL064 1 31100 007 TRANSISTOR MOSFET N MMBF DESCRIPTION 4 31500 003 TRANSISTOR PNP BC807 25 DESCRIPTION TRANSISTOR SM BC807 25 2 32000 004 CAP SMD CER 100nF 1096 12 SURFACE MOUNTED CERAMIC CAPACITOR 4 32000 023 CAP SMD ELEC 10uF 16V 04 ALUMINIUM ELECTROLYTIC SMD CHIP 3 32000 025 CAP SMD CER 10nF 1096 060 SURFACE MOUNTED CERAMIC MULTILAYER 3 32000 027 CAP SMD CER 1nF 10 060 SURFACE MOUNTED CERAMIC MULTILAYER CAPACITOR 4 32000 029 CAP SMD CER 100nF 20 80 SURFACE MOUNTED CERAMIC MULTILAYER 14 32000 030 CAP SMD CER 100pF 596 060 SURFACE MOUNTED CERAMIC MULTILAYER 10 32000 043 CAP SMD CER 22pF 10 060 DESCRIPTION CAP SMD CER 22pF 50Vdc 10 1 32000 070 CAP SMD ELEC 10uF 50V 06 CAPACITOR SMD ELECTROLYTIC 10uF 50V 2 33000 027 RES SM 10R MF 1 0 063W CHIP RESISTOR 10R 1 0 063W 1 33000 0
20. 29 RES SM 100R MF 196 0 063W CHIP RESISTOR 100R 196 0 063W 1 33000 0830 RES SM 330R MF 1 0 063W CHIP RESISTOR 330R 196 0 063W 2 33000 031 RES SM 1K MF 1 0 068W CHIP RESISTOR 1K 1 0 063W 8 33000 033 RES SM 2K2 MF 1 0 063W CHIP RESISTOR 2 2 196 0 063W 50V DC 1 33000 034 RES SM 3K3 MF 1 0 063W CHIP RESISTOR 3K3 196 0 063W 50V DC 2 33000 037 RES SM 10K MF 1 0 063W CHIP RESISTOR 10K 196 0 063W 33 33000 040 RES SM 47K MF 1926 0 063W CHIP RESISTOR 47K 196 0 063W 8 33000 041 RES SM 68K MF 1 0 063W CHIP RESISTOR 68K 196 0 063W 1 33000 042 RES SM 100K MF 196 0 063W CHIP RESISTOR 100K 1 0 063W 50V 2 33000 044 RES 1M MF 1 0 068W CHIP RESISTOR 1M 1 0 063W 50V 5 33000 060 RES SM 18K MF 1 1 8W 12 DESCRIPTION RES SM 18K 196 0 125W 1206 1 33000 069 RES SM 3K MF 1 0 063W DESCRIPTION RESISTOR SM 3K MF 196 0 063W 50Vdc 4 33000 100 RES SM 470K MF 196 0 063W RESISTOR 470K MF 196 0 063W 4 33000 112 RES SM 15K TF 1 0 063 0 RESISTOR SM 15K TF 1 0 063W RC22H 1 33000 114 RES SM 10M MF 1 0 068W RESISTOR SM 10M MF 196 0 063W 50V 100PPM 1 35965 010 SOCKET SM 30 WAY 1mm FFC SOCKET SM 30 WAY 1mm TOP CONTACT 1 5173 579 BAR CODE LABEL 1 25995 013 LABEL CUSTOM 6 35X24mm CUSTOM LABEL 6 35X24 MM 3 LABELS PER ROW 1 25413 306 FUSE 2A F HBC 600V 50KA 3 FUSE 2 AMP F HBC CERAMIC 2 25955 028 FUSE CLIP 1 1 4 LOW PROFI 1 1 4 LOW PROFILE PCB MOUNT FUSE CLIP 4 25960 118 HEADER 1 WAY CLIP IN DESCRIPTION HEADER 1 WAY
21. 290 Title 2nd Function Switch Instrument LT RCDT3xx Drawn By Chris Wedge 11 06 04 22036 05 05 04 22007 MEGGER LIMITED Sheet 9 of 10 ZERO CROSSING DETECTOR 5V zcsELECT 2 gt ZERO CROSS 5V R206 A 1 00 0V A 063 ZC SELECT wt 0 1000M ZC SELECT2 off 6 0 063 Volts L N C94 0 063 DIAS 1000009 pojo 15123 ZERO CROSSING Volts L E gt 14 25 R211 CLAMPER 2 Volts N E 3 CC gt ZERO CROSS 2 2 217 218 S G 10 00K 0046 of 8 V 1 1 00K 4 OV D 0 063 R213 ZERO CROSSING 0 063 D67 V Coo TP230 1 00K LL4148 OV A 100 000 1 25 0 063 Bi R323 5V 10 00K V TP231 ZERO CROSS 50 gt 0 oA 5V 127 TP261 s D tV a ZEROCROSS 1 C ap TET 74HC74 A R 220 1 5V TP129 TP221 C N P1 OUT lt gt VCOUT P2 OUT 1 PLL LOCKED PULSE me C1 2 H 22 00nF INH DEMOD TP223 ier 50 00 ZEN L 0 4046 TP130 0 063 100 00 1 224 25 10 00K Q C68 0 063 immi 1000nF TP227 50 100 00K 1 0 063 V OV A Not Fitted list Surface Mount Conventional D63 LK1 LK2 LK3 LK4 LK5 LK6 LK7 LK8 IC40 D32 D33 D34 D35 D36 D37 D38 D39 D40 D41 lt Core Design gt R1 amp R2 D43 D45 D46 D47 D48 D50 D52
22. 40 RES SM 47K MF 1 0 063W CHIP RESISTOR 47K 196 0 063W 2 33000 041 RES SM 68K MF 1 0 063W CHIP RESISTOR 68K 196 0 063W 1 33000 042 RES SM 100K MF 196 0 063W CHIP RESISTOR 100K 196 0 063W 50V 18 33000 044 RES SM 1M MF 1 0 063W CHIP RESISTOR 1M 196 0 063W 50V 11 33000 051 RES SM 10M MF 1 1 4W 12 RES SM 10M 1 0 25W 1 33000 052 RES SM 220R MF 196 1 8W 12 RES SM 220R 1 0 125W 2 33000 068 RES SM 300R MF 196 0 063W RESISTOR SM 300R MF 196 0 063W 50Vdc 4 33000 069 RES SM MF 1 0 063W RESISTOR SM 3K MF 196 0 063W 50Vdc 3 33000 070 RES SM 30K MF 1 0 063W RESISTOR SM 30K MF 1 0 063W 50Vdc 12 33000 101 RES SM 1R TF 1 0 063W RES SM 1R TF 1 0 063W 1 33000 033 RES SM 2K2 MF 1 0 063W CHIP RESISTOR 2 2 1 0 063W 50V DC 1 34000 008 POT SMD 100K 25 0 15W 4mm POTENTIOMETER 100K 25 0 15W 50V 1 35000 015 CRYSTAL 6MHz 49 4 CRYSTAL 6MHz HC49 1 35400 002 FUSE T SMD NANO R45 SURFACE MOUNT FUSE NANO SMF 3AMP TIME DELAY 1 35965 009 SOCKET SM 30 WAY 1mm FFC SOCKET SM 30 WAY 1mm FFC BOTTOM CONTACT 1 1 1 1 3 2 5173 579 BAR CODE LABEL 25995 013 LABEL CUSTOM 6 35X24mm CUSTOM LABEL 6 35X24 MM 3 LABELS PER ROW 5240 442 DISPLAY PCB LT RCDT300 SER Display PCB to Drg iss 1 A W Ed 3 31000 039 GATE SINGLE 74A IC XOR GATE SINGLE INPUT 32000 035 CAP SMD FILM 1 0uF 596 DESCRIPTION SURFACE MOUNTED POLYESTER CAPACITOR 33000 035 RES SM 4K
23. 63 HW 4 ey P81 PROG OV D C39 R142 R143 m SW18 100 00K 10 00 319 R320 R321 R322 i 1 1 BUSY P64 10 00K 10 00K 10 00K f 10 00k 0 063 0 063 FLASH CLK1 1 1 1 1 PLASH gt GE 0 063 0 063 0 063 0 063 PROG 5 V V SW19 a 0V D oVv D V RESET ov D lt Core Design gt M er MEGGER LIMITED Document Number Archcliffe Road Dover PROG egg q Kent CT17 9EN England 6270 290 Title Microprocessor Circuits Instrument Loop Tester Date Tuesday November 04 2003 3 05 05 04 22007 MEGGER LIMITED Size Sheet 6 of 10 5 4 3 2 1 TP276 BATTERY VE TP83 A 84 R147 R144 C41 gee jp 2 R145 C40 10 00uF 1 10 00nf 1 16 00 MBRS130LT3 0 063 50 00 0 063 TP304 10 00M 10 00nF NDS352AP o s NDS352AP 1 00 50 00 BATTERY VE V TR18 TP85 pi TR19 8 45V D 0V P 86 A L L3 z R228 i De 220uH 0 063 C44 C118 C119 220 00 TP139 BRS130LT3 BZX84C5V6 100 00uF 100 00uF TP138 25 00 jeno 16 00 a R230 V i sw orc gt 90 1 IC41 TP88 LO OFF E prd R149 ON Fx 10 00 30 00 DTe COMP P D25 TP89 TP90 S 0 063 V OV D 10
24. 7 MF 1 0 063W CHIP RESISTOR 4K7 1 0 063W 4 33000 114 RES SM 10M MF 1 0 063W RESISTOR SM 10M MF 1 0 063W 50V 100PPM 1 30000 084 OP AMP DUAL TLE2022CD DUAL OP AMP SMD 1 31400 008 ZENER SM 0 35W 5 5 6V BZX ZENER SM 0 35W 5 5 6V BZX84 1 31500 003 TRANSISTOR PNP BC807 25 DESCRIPTION TRANSISTOR SM BC807 25 1 33000 064 RES SM ORO TF 1 OW 1206 DESCRIPTION RES SM ORO 1 OW 1206 JUMPER LINK 1 25960 045 HEADER 36 WAY HEADER 36 WAY 0 2 25975 107 SWITCH PUSH SPNO PCB SWITCH PUSH BUTTON TACTILE PCB MOUNT 12x12mm 1 27900 061 220 0 24A AXIAL INDUCTOR 220uH 0 24A 10 110 500kHz 1 27920 011 BUZZER 1 5V 160hm T ELECTRO MAGNETIC TRANSDUCER 1 28920 098 LED RED HI BRIGHT 600MCD 3 LED HIGH BRIGHT RED 600MCD 3mm 3 6280 350 LCD MIT300 SERIES LCD MIT300 SERIES TO DRG ISS 1 1 6180 483 BACKLIGHT MFT1502 Backlight to Drawing Iss 1 1 27900 059 INDUCTOR 220uH 0 6A 10 EL INDUCTOR 220uH 0 6A 10 0 290hms 1 25925 004 WIRE LINK BARE 0 6mm DIA WIRE LINK 0 6mm DIA CU TINNED BANDOLIERED 1 Variations LT310 RCDT310 LRCD200 amp LRCD210 have no backlight fitted LT330 RCDT330 have programmed uP no 6139 194 Power PCB Assembly LT RCDT amp LRCDs 6231 735 17310 320 PWR PCB ASSY RE 1 5240 443 LT RCDT300 SERIE POWER PCB TO DRG ISS
25. 7 requires that this current is never lower than the rated current The wave shape for the d c sensitive test will confuse most multimeters The current used to measure loop resistance can never be measured with a multimeter Never use peak hold on the multimeter they are readily confused by switching transients A resistor and a FET are used and both or either of these will get hot The temperature is measured prior to and during testing and the test will be stopped if this is too high 3 Difference Voltage measurement Loop Resistance To measure the loop resistance of a circuit the difference between the on load and off load voltages is measured This is normally done several times and an average taken Assembly Drawings Insulator 11 E od A 1 prees ne ae PCB securing Battery Lead Screws Title Part No a Instrument Assembly 6411 095 25 Retain with continuous bead of RTV Item 43 ist Used On LT RCDT300 Series amp LRCD200 Series Scale 1 1 Start Finish Ensure no gap Note Upper switch is rotated 180 to lower switch Note LT310 Bera Upper Suen te RCDT330 LRCD200 LRCD210 Lower switch shown in OFF position LRCD220 Apply contact grease item 17 to pcb switch pads using Tool AT21372 Use switch assembly nest AT22184 Apply pressure directly over legs when pushing into switch mouldings Start Finish Ensure no gap Torque 1
26. 90Z gt TEMP TR D TR46 FQA11N90 TR44 MJF31C D90 R321 C127 2 79 1 100 00nF 100 00K 1 00n C C112 50 TR37 for RCD Tester 100 00nF TR46 for Loop Tester 0V S D79 1N4007 D80 1N4007 5V C107 A 100 00nF 50 74HC123 R297 R309 150 00R 100 00R 1 1 0 25 B 200ns pulses every 8us 0 063 R313 5V b TP212 e 1 308 150 008 33 00R D83 1 1 2 1N4007 0 25 0 75 0 25 D84 Z Ds TG 1N4007 C108 LL4148 R315 10 00K TP214 D85 1 9 1 4007 218 9d D86 1N4007 TR42 MMBFO0201NLT1 74HC123 Current Source Drive SK17 114148 093 Name gt gt gt Current Source VE M er MEGGER LIMITED Document Number ov D Archcliffe Road Dover D egg 1 Kent CT17 9EN England 6270 289 LT RCDT300 series Power PCB Instrument _ LT3xx RCDT3xx Issue Date CN No Drawn By Rongkai Xu Chris Wedge 2 26 4 04 21993 Date Monday October 20 2003 3 11 06 04 22036 MEGGER LIMITED Size Sheet 5 of 6 3 2 1 LN C gt 5V Current Source VE Enable lt TP161 D68 R248 DAC R249 TP203 Enable n h gt I 10 00 BC807 25 3 0 063 Z pss 1 1N4007 Z 070 100 00K 0 063 LoP D71 1N4007 Not Fitted 1 P6KE440P 0 063 72 254 h 9 30K T 1N4007 0 063 09 R326 4 gt gt Current Source Drive TR35 DAC x2 MMBFO201NLT1 3 30K R338 I m D91 100 00K LL4148 1 TP207 0
27. 9550 009 TRANSISTOR MOSFET 11 TRANSISTOR MOSFET N CHANNEL 1 Variations Relays If no relays are fitted only one fuse FS2 needs to be fitted Transistor TR46 29550 009 is fitted to LTs and LRCDs Transistor TR37 29550 008 is fitted to RCDTs Resistor 910 26836 214 fitted to RCDTs Resistor 1000 26836 706 fitted to LTs and LRCDs Appendix 1 Display Messages A2d diagnostic test ad converter AC ac rcd test selected AC S ac selective rcd test selected ALL with dEL delete all diagnostic test battery bXY distribution board number XY CAL calibrate mode selected CAL diagnostic test read calibration constants CAL calibration was successful cAL calibration flag status instrument is calibrated CEN diagnostic test keys centre button pressed CH O checksum flag status checksum OK CH F checksum flag status checksum failed CH F checksum failed warning at start up chk check connections no current detected test could not be performed chk warning triangle chX diagnostic test ad converter channel number 0 7 CON diagnostic test contrast on display CUS customer mode selected cXY circuit number XY dC dc rcd test selected dc S dc selective rcd test selected dEb debug mode selected dEC decalibration was successful dEC decalibrate mode selected dEC decalibration warning dEL delete diA diagnostics mode selected
28. GHT 1 299 BUZZ SEG16 16 5 21 TR35 0 063 R120 SEG17 0 SEG20 BC807 25 10 00K i 30 00K 56 SEGI8 18 9 SEG19 1 0 063 1 0 06 6280 350 C31 BO 00K TP59 2 20UF C32 1 TP300 100 00n 0 063 127 16 ae i 10 00R TP301 1 TP302 BATTERY V TR33 R128 0 068 T vec Vref OV D 99 C33 MMBFO201NLT1 T ag aes wr 10 00 5 AVSS 96 0 063 50 R333 a 00 oa 4 Ves TES BACKLIGHT 25 pio s4 vss P20 A0 D0 22 SESE poy OVE P21 A1 D1 D0 ERES V 100 00K 70V D OV D P22 A2 D2 D1 Z OV A oVD 1 0063 62 ows gt H Psucrsonrso P23 A3 D3 D2 88 i TXDO LNFIT gt P61 CLKO 24 4 104 03 22 sEG15 9 4 P62 RxDO P25 A5 D5 D4 EGIS TA EEPROM 8k x 8 DIFF GAIN P64 POS TXDO cnn P26 A6 D6 D5 H e6 000K 2 5 REFERENCE DIFF GAIN XC 3a 764 CTS1 RTS1 CTSO CLKS1 P27 A7 D7 D6 22 sEG12 coe P65 CLK1 P30 A8 D7 gt P66 RxD1 P31 A9 0063 R130 R131 aa BACKUGHT 1 P67 TxD1 P32 A10 20 25 10 00K 10 00K SPARET 0 P70 TxD2 SDA TA0out P33 A11 22 SEG 1 1 45V BUZZ P71 RxD2 SCL TAOin TBSin P34 A12 25 sec 0 063 0 063 gt 72 1 2 1 P35 A13 SEG6 LOADED 27 p73 CTS2 RTS2 TA1in V P36 A14 gt SEGS R133 R134 R135 R136 2 UNLOADED lt _ P74 TA2out W P37 A15 SEGA 10 00 ZERO P75 TA2in W P40 A16 22 ovib Ov D SR P76 TA3
29. NOLOG 40 INTEGRATED CCT 4051 ANALOGUE MULTIPLEXER 2 30000 024 IC ANALOG SWITCH 3x2IN PT DESCRIPTION IC 3x2 INPUT ANALOGUE SWITCH 4053 2 30000 050 IC FLIP FLOP DUAL 74HC7 DESCRIPTION INTEGRATED CIRCUIT DUAL FLIP 2 FLOPS 30000 052 OP AMP J FET 062 INTEGRATED CIRCUIT BASE NO 062 LOW POWER J 1 FET 30000 078 IC PHASE LOCK LOOP HEF4046 DESCRIPTION IC PHASE LOCK LOOP 1 30000 087 OP AMP AD622AR IC INSTRUMENTATION OP AMP 1 30000 102 IC EEPROM 8Kx8 24C64 SO8 IC 8Kx8 SERIAL EEPROM 1 6139 190 PROGRAMMED uP LT RCD310 32 1 30000 180 SHIFT REG 8 BIT SIPO HC IC SHIFT REGISTER 8 BIT 74HC164 1 30000 181 SHIFT REGISTR 8 BIT 74H IC SHIFT REGISTER 8 BIT 74HC165 2 30200 036 IC OP AMP QUAD LMV IC OP AMP QUAD RAIL TO RAIL LMV324 1 30200 037 PWM CONTROLLER TL5001 PWM CONTROLLER 1 30200 041 REGULATOR SWICHING LM3 SWITCHING REGULATOR LM3578 1 31000 001 TRANSISTOR NPN DRG 6180 39 TRANSISTOR 8 31000 002 DIODE SM LL4 DESCRIPTION DIODE LL4148 75V 150mA 15 31000 004 TRANSISTOR PNP DRG 6180 39 TRANSISTOR 2 31000 005 IC COMPARITOR TAPE LM DESCRIPTION IC QUAD COMPARITOR 2 31000 021 DIODE SM SCHOT 1 MBRS130 SCHOTTKY POWER RECTIFIER DIODE 2 31100 007 TRANSISTOR MOSFET N MMBF DESCRIPTION 6 31100 010 TRANSISTOR MOSFET NDS35 TRANSISTOR MOSFET P CHANNEL 3 31300 004 DIODE SM FAST DUAL BA DESCRIPTION HIGH SPEED DUAL SERIES DIODE 1 32000 001 CAP SMD CER 330pF 10 12 SURFACE MOUNTED CERAMIC CAPACITOR uu 1 32000 002 CAP
30. OP INDEX SPIDER SWITCH TOP DRG ISSUE 2 2 5131 378 CONTACT DISC Contact Disc to Drg Iss 1 3 5160 324 SPRING ROTARY SWITCH SPRING ROTARY SWITCH DRG ISSUE 1 3 5210 361 SWITCH BOTTOM A SWITCH BOTTOM DRG ISSUE 2 2 21264 227 SCREW PLASTITE No4 5 PAN NOA X 1 2 SELF TAPPING SCREW 6 5210 461 KEYPAD LT320 2 Keypad to Drg Iss 1 21819 527 SCREW M4x8 PAN POZI ST ZP amp SCREW M4 X 8MM STEEL ZINC 1 21277 018 SCREW PT 3x6mm PAN HD THRE SCREW PT SIZE 3 PAN HD 2 21138 014 PIN DOWEL 2 5 ST STEELD STAINLESS STEEL DOWEL PIN 2x5mm DIN7 H8 4 17685 008 GREASE PLASTICS 5 GREASE FOR PLASTICS 0 17641 672 GREASE SILICONE MOLYKOTE 4 GREASE SILICONE BASED 0 5140 930 FOAM STRIP 25x8x3 FOAM STRIP 25 x 8x3 2 21814 737 WASHER M4 LD PE ANTI LOSS WASHER M4 ANTI LOSS 1 6220 780 CARRY STRAP MIT LT RCDT30 CARRY STRAP DRG ISS 1 1 25511 841 BATTERY 1 5V AA ALKALINE BATTERY 1 5V SIZE AA ALKALINE 8 6172 877 USER GUIDE CD MIT LT RCDT3 USER GUIDE CD MIT LT RCDT300 DRG ISS 4 1 SHEET 1 6172 059 WARRANTY CARD 3 YEAR MEG WARRANTY CARD 3 YEAR EDITION 4 1 18190 013 SLEEVING SILIC 101 5 002 1 SILICONE RUBBER SLEEVING TO BS2848 1 2m 5270 848 LABEL SET LT320 3 1 5152 273 PLUG CONTACT PLUG CONTACT 3 5210 454 INTERLOCK MIT LT RCDT300 S INTERLOCK TO DRG 155 1 1 6220 782 LEADSET RED BLK GRN 1 5ML LEADSET RED BLK GRN 1 5M LT300 DRG ISS 2 1 6220 785 POUCH MIT300 CARRY BAG TO DRG ISS 2 1 6260 169 CARTON MIT LT RCDT300 CARTON MIT LT RCDT300
31. Port 10 channels Since port 2 and half of port 0 are used for the display the display driving is suspended for a short time while these channels are sampled They should return values near zero Press the TEST button at any point to step to the next test Test 7 Primary rotary switch Range switch Message RS P Shows the numbers of the and b tappings as read from the range switch Led neons are turned off The display shows tapping b number on the left and tapping a number on the right with P in the centre to identify the Primary switch Note that the instrument cannot be switched off during this test Press the TEST button to step to the next test Test 8 Secondary rotary switch Second switch Message 5 5 Shows the numbers of the a and b tappings as read from the second switch Led neons are turned on as an indicator to the second switch The display shows tapping b number on the left and tapping a number on the right with S in the centre to identify the Secondary switch Press the TEST button to step to the next test Test 9 Mode links Message LIN Shows the status of mode links LK1 to LK8 The display shows the data as LXY where XY is a hexadecimal byte in which Y represents LK1 LK4 and X represents LK5 LK8 Press the TEST button to step to the next test Test 10 Display Contrast Me
32. R201 x4 7 TP117 2 0 063 R241 temo tr 1 00K TEMP 0 gt gt R203 0 063 Temp TR is one diode junctionsattached to the power transistors 10 00K Would expect a voltage about 0 6V changing by 2mV C We could 1 D67 expect tempertures in the range 10C cold no test to about 100C 0 063 LL4148 a range of about 0 55V 0 75V OV A 5V 5V 15V C116 C117 10 000 C118 16 E 10 00UF C119 C120 C121 100 00n 100 00n 10 00uF 25 25 pd 1 6 0V A C123 C124 1000 2m 100 00 50 25 0V D 5V 15V lt Variant Name gt M er MEGGER LIMITED Document Number Archcliffe Road Dover egg 1 Kent CT17 9EN England 6270 289 LT RCDT300 series Power PCB Instrument LT3xx RCDT3xx Drawn By Rongkai Xu Chris Wedge Date Wednesday October 29 2003 1 11 06 04 22036 MEGGER LIMITED Size Sheet 4 of 6 R A Q 9 5 4 3 skis 2 skis 1 Wire ih Link R243 C Current Source 390 00K 5 0 5 R247 100 00R 5 D 7 By Power Resistors 7 1 ENP R D D87 R310 LL4148 330 00R TR33 R312 BCW32 1 00M 228 D88 I 063 Sino TP213 LL4148 5 00 TX 12 00 TR34 TR41 BCW32 330 00R 1 308 10063 R319 1 TR37 0 25 STP6NK
33. SMD CER 470pF 10 12 SURFACE MOUNTED CERAMIC CAPACITOR uu 1 32000 013 CAP SMD TANT 2 2uF 20 1 CAPACITOR TANTALUM 2 2UF 20 1 32000 017 CAP SMD CER 220nF 10 12 SURFACE MOUNTED CERAMIC CAPACITOR 1 32000 023 CAP SMD ELEC 10uF 16V 04 ALUMINIUM ELECTROLYTIC SMD CHIP 6 32000 025 CAP SMD CER 10nF 1096 060 SURFACE MOUNTED CERAMIC MULTILAYER 11 32000 027 CAP SMD CER 1nF 1096 060 SURFACE MOUNTED CERAMIC MULTILAYER 5 CAPACITOR 32000 029 CAP SMD CER 100nF 20 80 SURFACE MOUNTED CERAMIC MULTILAYER 35 32000 031 CAP SMD CER 33pF 596 060 SURFACE MOUNTED CERAMIC MULTILAYER 2 32000 037 SMD ELEC 100uF 20 08 ALUMINIUM ELECTOLYTIC SMD CAPACITOR LONG LIFE 2 VERT 32000 041 CAP SMD CER 22nF 10 120 CAP SMD CER 22nF 10 1 32000 043 SMD CER 22pF 10 060 CAP SMD CER 22pF 50Vdc 10 1 32000 070 CAP SMD ELEC 10uF 50V 06 CAPACITOR SMD ELECTROLYTIC 10uF 50V 4 33000 020 RES SM 7K5 MF 2 1 8W 12 RESISTOR 7K5 2 0 125W 1 33000 027 RES SM 10R MF 1 0 063W CHIP RESISTOR 10R 196 0 063W 6 33000 028 RES SM 33R MF 196 0 063W CHIP RESISTOR 33R 196 0 063W 2 33000 031 RES SM 1K MF 1 0 063W CHIP RESISTOR 1K 196 0 063W 26 33000 037 RES SM 10K MF 1 0 063W CHIP RESISTOR 10K 196 0 063W 56 33000 038 RES SM 22K MF 196 0 063W CHIP RESISTOR 22K 196 0 063W 2 33000 039 RES SM 33K MF 196 0 063W CHIP RESISTOR 33K 196 0 063W 50V TC 100PPM 1 33000 0
34. Service manual Loop Testers LT310 LT320 amp LT330 RCD Testers RCDT310 RCDT320 amp RCDT330 Loop RCD Testers LRCD200 LRCD210 amp LRCD220 Issue 1 6172 901 Megger Limited Safety Warnings Safety Warnings and Precautions must be read and understood before the instrument is used They must be observed during use Please read the special hazards for the service engineer below Replacement fuses must be of the correct type and rating Failure to fit the correctly rated fuse may result in a safety hazard and may cause damage to the instrument in the event of an overload When connected to a mains supply the whole of the instrument must be considered hazardous live If instrument is open and you are faultfinding suitable precautions must be taken After tests the power resistors and heatsink on the power board could be hot Guide to Fault Finding Basic Operation Switching from OFF will cause the firmware version number to be shown for slightly less than one second The backlight if fitted will turn on until the display has settled Normally the supply voltage will be shown and a test started by pressing the TEST button Pressing the backlight button enables the backlight The backlight turns off after 20 seconds to save battery power The LT3x0 RCDT3x0 and LRCD2x0 are similar instruments with common circuits and functions in fact the PCBs are largely common and instrument s identity is setup in manufacture te
35. TO DRG ISS 1 1 6260 170 BLISTER INSERT BLISTER INSERT TO DRG ISS 1 1 5140 982 INSULATOR LT RCDT300 SERIE 1 22420 084 SPACER 10LG SNAP FIT NYLON SPACER 10mm LONG SNAP FIT NYLON 4 25274 417 CABLE TIE 100x2 5mm T18R DESCRIPTION CABLE TIE NYLON 3 5174 171 SAFETY WARNING SHEET LT RC SAFETY WARNING SHEET LT RCD300 1 5270 855 QUICKSTART LABEL LT300 4 QUICKSTART LABEL LT300 TO DRG ISS 4 1 13497 095 RIBBON CABLE 30 WAY 40LG F RIBBON CABLE 30 WAY 40mm LONG 1mm PITCH 1 18760 013 ADHESIVE SEALANT 744RTV 31 ADHESIVE SEALANT 744RTV 0 25 ml 25132 017 CABLE SLEEVE NEOPR BLK 1 5 CABLE SLEEVE BS 3858 BLACK 3 21127 638 PIN COILED 1 8 DIA X 9 16 DOWEL PIN 1 8 DIA X 9 16 LG TO ISO 8750 2 Note LT310 only has 1 switch and uses Case Kit A 6231 722 Keypads and Labels Instrument Keypad Instrument Quick Start Type Label Set Label LT310 5210 460 5270 847 5270 855 LT320 5210 461 5270 848 5270 855 LT330 5210 462 5270 849 5270 855 RCDT310 5210 463 5270 850 5270 856 RCDT320 5210 464 5270 851 5270 856 RCDT330 5210 465 5270 852 5270 856 LRCD200 5210 471 5270 873 5270 877 LRCD210 5210 471 5270 874 5270 877 LRCD220 5210 472 5270 875 5270 877 Display PCB Assembly LT RCDT amp LRCDs Megger Description Qty Part Number 6231 733 LT320 RCDT320 DISPLAY PCB 30000 023 1 MULTIPLEXER A
36. V or 50 If the fault voltage display is active a bar graph display will also appear 5 Press the button to turn bar graph display ON or OFF Switch ON 6 Press the TEST button to exit from the set up menu The normal test is with a loop resistance of 9000 the 30mA rated current setting This will give a calculated contact voltage of 27V or a display of 28 to 31V 45 to 115906 Appendix 3 LT3X0 RCDT3X0 LRCD2X0 Error Numbers 03 16 17 18 19 20 39 40 42 43 44 53 58 75 No acknowledgement from eeprom Unstable data from keys or configuration links Unstable data from rotary switches Invalid data from range switch Invalid data from secondary switch Unstable data from battery measurement Resistor temperature is out of range Fet temperature is out of range Input frequency is too high Battery voltage is too high Battery voltage is too low Shutdown failed power has not turned off Instrument type incompatible with hardware configuration Eeprom error during result storage Appendix 4 Diagnostic Tests There are several ways to access diagnostics choose the most convenient method In each case the display shows the message diA It is usually possible but not always to exit diagnostics by turning the turn the range switch to OFF Method 1 disassembled instrument Fit link LK3 When viewing the display board from the display side locate the posi
37. ace board can be checked by installing the driver software on a PC and then looking at the System Properties Settings gt Control Panel gt System and then the System Properties tab Check on the Ports COM and LPT Connecting an instrument will give you an extra COM port labelled UMP3410 Serial Port COMxx SEM INCLUIR guapes EY Ports COM amp LPT 7 Communications Port COM1 j JF Communications Port COM2 7 Printer Port LPT1 UMP3410 Serial Port COM3 To further check the interface board run HyperTerminal or other RS232 interface program and select the COM port labelled above Connect the instrument FIRST Change the configuration to 9600 baud 8 bits no parity 1 stop bit and no flow control Switch to any on position other than send and type in a s and the message Select SEND on instrument will be received Assembly and Disassembly The USB Board is fitted in one corner of the case and connected to the display board by four wires A replacement PCB is available order from Service at Dover ukrepairs amp megger com Fixing Screws Megger Part Number 5140 981 30000 102 30200 004 31000 001 31000 002 32000 018 32000 038 32000 043 32000 044 33000 005 33000 028 33000 031 33000 032 33000 037 33000 042 33000 044 33000 070 33000 103 35000 013 30000 188 5173 579 25995 013 33000 029 25960 066 25965 178 29350 002 6140 381 USB PCB 800000 4
38. ace of components in position shown CARRY CASE amp SLEEVE PACKAGING Place User guide CD item 105 Warranty card item 106 Safety wamin sheet 193 Certificate of Test item 44 ER LOD TALE label and Download Manager CD item111 in polythene bag item 116 and insert in lid pocket as shown Pack Leads and Carry Strap item 20 in this area Ensure blister clips into c shaped catch on bottom face of carton Pack Leads and Carry Strap item20 in Pouch 7 Place User guide CD item 105 Warranty card item 106 Safety warning sheet item 112 Certificate of Test item 44 and Download Manager CD 111 in a polythene bag on top of the pouch Place large label amp barcode label on underside Megger Ltd Archcliffe Road Dover Kent CT17 9EN U K THIRD ANGLE Drawn S D Clark Date 23 03 2004 PROJECTION n DO NOT SCALE IF IN DOUBT ASK DIMENSIONS IN MILLIMETRES iss UE DATE Material THIS 15 A COMPONENT DRAWING AND THE TOLERANCES SHOWN TOLERANCES UNLESS STATED See BOM REFER TO THE COMPONENT AND ITS ASSOCIATED TOOLING 0 6 11 01 2005 MEGGER LIMITED TO 1 DECIMAL PLACE 0 15 Reproduction in whole or part without prior permission from the copyright owner is strictly prohibited HOLES BS4500 H11 5 02 07 2004 Finish Disassembly 1 Turn switch to OFF position 2 Remove four corner screws in the base Keeping instrument upside do
39. e for debug only and are not intended to be fitted on production instruments 5V RANGE LEDS D RANGE_LEDS i 195 lt R174 22 00K 0 063 TR26 BCW32 POWER SWITCH OUTER POWER SWITCH MIDDLE V TP197 0V D Top switch Bottom switch Ring Alignment Ring Alignment TOO1 BOO1 TM09 BM17 RANGE POSITION OUTER TC17 RANGE POST BC6965 POSITION SWITCH INNER Range Switch gt RANGE 100 00K gt RANGE A 1 00 115 50 00 1 00 201 iibi l OV A Core Design M MEGGER LIMITED Document Number A egger Kent GT17 SEN England 6270 290 Title Range Switch Instrument _LT RCDT3xx Drawn By Chris Wedge 11 06 04 22036 05 05 04 22007 MEGGER LIMITED Sheet 8 of 10 5 2nd Function Switch These LEDs are for debug only 5V A and are not intended to be fitted on production R182 gt oa R182 instruments 4 0 125 D D72 4 D V gt RANGE LEDS 5 4 SE TP203 v R183 22 00 0 0637p294 7 F a wh wh wh xh TR2 BCW POWER SWITCH OUTER POWER SWITCH MIDDLE V 0V D Top switch Bottom switch Ring Alignment Ring Alignment TO01 BO01 hive suis RANGE POSITION OUTER 17 RANGE POST BCAS CE POSITION SWITCH INNER 2nd F B 211 ange A 1 00 185 0 063 50 00 100 00 1 C117 1 00n V 50 00 OV A lt Core Design gt MEGGER LIMITED Document Number A V NA Megger 6270
40. elected diagnostic test temperature of fet trE diagnostic test temperature of resistors trP supply tripped unexpectedly t X auto rcd test phase uNC calibration flag status instrument is uncalibrated UNC uncalibrated warning at start up USb usb mode selected VES diagnostic test keys west left key pressed VX Y firmware version number at start up gt 25V contact voltage limit exceeded gt 50 contact voltage limit exceeded lt xyzV insufficient supply voltage for test to begin gt xyz job number xyz Appendix 2 Manual Test Procedure Loop Testers and Loop Test functions on Loop RCD testers In the Dover factory instruments are calibrated and tested automatically using a PC Manual calibration is not possible contact ukrepairs megger com for details of the options available This is a Manual test procedure for the LT310 LT320 and LT330 instruments and for the loop test functions on LRCDs Note that some instruments allow for Neutral and Line to be swapped and the tests need to be repeated in this configuration Switch instrument on battery voltage 12V measure battery drain lt 50mA after 5s Switch instrument to V connect voltages as indicated and read display L N L PE 230V 50Hz 230 6V L N L PE 440V 50Hz 440 10V L N N E 240V 50Hz 240 6V Switch to the indicated range Switch the 2 function switch to the 7 posi
41. etween the two capacitors Alternating tests reverse the roles of the capacitors each one being either unloaded or loaded 15mA The displayed reading is a rolling average of the difference in the pairs of readings An input of at least 50 must be applied If this is not present the display shows Vol After a few seconds the display gives the result in both analog and digital formats along with an arrow showing which way to turn the pot as viewed from the pot side of the board Adjust R63 for a minimum reading less than 10 counts Press the TEST button at any time to step to the next test Note There is a shortcut to this procedure from the screen Hold down the top right hand button and press the left hand button Not available on the 310 The pot adjust routine begins automatically Another shortcut is to fit LK7 which allows the procedure to be executed immediately after the start up sequence Test 13 EEPROM Message EEP The entire content of the eeprom is transmitted via the serial interface It is arranged as hex bytes and formatted into rows and columns with addresses at the start of each row The led neons show progress via a pattern which changes every kilobyte Press the TEST button at any time to step to the next test Test 14 Power down Message oFF The microcontroller continuously asserts the POWER OFF signal The instrument should switch off after a cou
42. flowing in the circuit Line to PE 2 Connect the instrument to a mains supply The current meter should read about 0 5 0 75mA 3 Press the test button The instrument will now do 15mA test of 2 seconds duration The reading on the current meter will vary until it stabilizes at about 14mA This should be less than 15mA Do not use peak hold Switch instrument OFF to restore to normal operation Final Checks 1 2 Fit blank grey label to hole in battery compartment Insert batteries and secure battery compartment Open case by folding lid to the back and clicking it into position Visually check external appearance Check the gap between the two halves of the case Turn on to V Observe the version number e g V1 0 and the three L PE L N and N PE LEDs light briefly Instrument should say V arc should be display with pointer at 0 and battery indicator should show full Press backlight button if applicable and check backlight works Press PFC lt 0 180 gt lt Lock gt and lt TEST gt buttons if applicable and check and beep Rotate main switch through ranges and check for end stops and correct display i e V arc and V Hz Hz No Trip V and closed switch Hi if present V and open switch 10 Check end stops work on 254 function switch if fitted 11 Switch to OFF and watch display go out RCD Testers and RCD Test functions on Loop RCD testers
43. ntre CEN Top row right RIG North NOR South SOU East EAS West VES Test TES Press the TEST button and one other to step to the next test Test 3 Battery voltage Message The battery voltage and battery symbol are displayed The data is also transmitted via the serial interface Press the TEST button to step to the next test Test 4 FET temperature sensor Message The temperature reading in Celsius is displayed along with the 0 symbol The data is also transmitted via the serial interface Press the TEST button to step to the next test Note There is a shortcut to this procedure from the screen Hold down the top right hand button and press the centre button Test 5 Power resistors temperature sensor Message trE The temperature reading in Celsius is displayed along with the 0 symbol The data is also transmitted via the serial interface Press the TEST button to step to the next test Test 6 A d converter Message 24 Display shows PO then chO to identify Port 0 channel 0 then shows the actual a d reading This is the average of 100 readings with sample and hold on The converter is used in 10 bit mode so the range of the reading is 0 1023 Press the LOCK DEGREE key to step sequentially through all the ad channels After channel 7 the test moves on through the Port 2 channels and then through
44. out 41 17 0 063 0 063 0 063 0 063 P77 TA3in P42 A18 OFF P80 TA4out U P43 A19 5 ZERO CROSS 50 lt P81 TA4in U POO DO 22 BP 2 Ido lt P82 INTO P01 D1 22 86 ZERO CROSS P83 INT1 P02 D2 BP TESTKEY gt P84 INT2 P03 D3 22 RANGE A ANGER P85 NMI P04 D4 S SW_5V 1 p86 Xcout P05 D5 RANGE B x Ese SH IE E meh DAC x2 8 P91 TB1in Sin3 P10 D8 0 SE6 5 Z ENABLE P92 TB2in Sout3 P11 D9 7 SEG21 VCC S LOOP TEST P93 DAO TB3in P12 D10 72 sEG22 amp DACI P94 DA1 TB4in 13 011 Patch EEPROM 1 4 LED DATA POS ANEXO CLK4 P14 D12 28 SE G2 Not Normall LEDCLK Too 1 4 P15 D13 INT3 J22 SE Gos filed y oy P97 ADtrg Sin4 P16 D14 INT4 SEG26 Volts L N Shifted P100 ANO P17 D15 INT5 SEG32 R137 C36 54684 Volts L E Shifted 5 P44 CS0 50 2522 a Volts N E Shifted P102 AN2 P45 CS1 P42 SEG30 DIFF OUT 10 P46 CS2 22 cEG g 0 063 66 PAIS TEMP TR P104 ANA KIO P47 CS3 PH ASA I Sense P106 AN6 KI2 P51 WRH BHE D lt 25 OV D TP67 Xu TP68 BATTERY V gg ne Coren G DATA RES 13 P57 RDY CLKout Dan P56 e KEYS CLK BYTE Ad RESET P56 ALE 20 652 V RELAY LN TP303 S BYTE P54 HLDA D RELAY N E CNVss P55 HOLD p41 4 2 45V TP73 M30620F CPFP R1 40 SPARE1 A 10 00 j R141 74 0 063 100 00 0212 1 114148 0 0
45. out 0 5 0 75mA Press the TEST button once to start the test and then again when the count begins The reading on the current meter will vary until it stabilizes to a reading Do not use peak hold RCD 1 21 1 Rating mA mA 10mA 4 6 4 9 10 2 10 8 30mA 13 8 14 7 30 6 32 4 100mA 46 49 102 108 300mA 138 147 306 324 500mA 230 245 510 540 1000mA 460 490 1020 1080 It is not possible to measure the 5I test currents or the ramp test currents but this is all generated from the same circuit as used for the 1 2I and I test currents Similarly dc sensitive test current cannot be measured The contact voltage can also be checked This is a measurement of the loop resistance but displayed as a voltage It is the voltage that would be expected to be dropped across the loop resistance if the rated current of the RCD was flowing in the circuit Therefore V Idn Rloop In most installations this needs to be less than 50V in agricultural installations 25V In some cases the display of this voltage will need to be turned on This can be done by 1 With the instrument switched OFF hold down the TEST button and turn the range knob to any ON position 2 Keep the button held down until the instrument displays the SET warning 3 Now release the TEST button 4 Press the TEST button twice to view the current settings for the touch voltage The display shows the fault voltage limit 25
46. ple of seconds Appendix 5 Common Faults Appendix 6 Firmware updates 310 320 330 Details V1 0 used for first 50 loop testers VI Improvements in automatic cal and test V1 2 first RCD testers V1 3 V2 0 fixed bugs in variants switched RCD Spanish and improvements in automatic cal and test V1 4 V2 1 Fixed problems with 50V 0 50V supplies V1 5 V2 2 Fixed false noise indication on some RCD RCBOs V1 6 V2 3 LRCD range introduced Appendix 7 Hardware updates RCD Testers only Change R251 to 91 ohms because a number of instruments were failing low on 1 test LT330 and RCDT330 instruments These instruments benefit from a USB connection allow download of stored results to a PC They differ in that a different microprocessor is fitted and also a bigger EEPROM in which the results are stored Also an extra board is fitted containing an isolated USB interface The USB interface uses the Texas Instrument TUSB3410 To use this driver software is required on the PC and this is available for Microsoft Windows XP 2000 ME and 98SE This software is supplied with the instrument on the Download Manager CD or can be downloaded free of charge from the Texas Instruments website Go to www ti com and search for TUSB3410VCP and follow the instructions to download the latest version Install this software BEFORE connecting the instrument Basic fault finding Operation of the interf
47. ssage CON Show modify the display contrast The display shows a number accompanied by the 0 symbol to indicate the contrast as a percentage of the maximum This is also represented on the bargraph display The default setting is 44 PFC TYPE button increase contrast NORTH UP button increase contrast LOCK DEGREE button reduce contrast SOUTH DOWN button reduce contrast WEST LEFT button set to minimum contrast EAST RIGHT button set to maximum contrast SPARE button reset contrast to default 44 Press the TEST button to step to the next test Test 11 Calibration constants Message Transmits all the data via the serial interface and then displays the calibration constants one by one Displays 0 followed by the value of calibration constant Press the LOCK DEGREE button to step to the next constant There are 64 altogether The default setting is 1 000 for constants 0 31 and 0 000 for constants 32 63 Press the TEST button at any time to step to the next test Test 12 Pot adjust Message Pot For correct measurement of loop resistances the time constants of the two branches in the 2 armed circuit need to be closely matched This is done by adjusting the series resistance in one of the arms using a potentiometer This diagnostic procedure provides a way of performing the adjustment Tests are carried out as a pair each test measuring the voltage difference b
48. st the only differences in the PCB Build are in the Power Board LT RCDT LRCD FET Fit TR46 Fit TR37 Fit TR46 FQA11N90 P6NK90 FQA11N90 Do not fit TR37 Do not fit TR46 Do not fit TR37 RL2 Fitted Not Fitted Fitted R251 1000 910 100Q Switch the instrument on by rotating the switch The instrument carries out these primary functions If a fault is suspected these functions need to be investigated in this order 1 Voltage Frequency Measurement The voltages between the three terminals are continuously measured The maximum voltage is displayed if this is greater than 25V a c The voltages are measured via 10Mohm resistances on the power board connected before the fuses and sampled by the processor On some instruments the frequency can also be displayed Note that as the voltages are measured before the fuses the correct voltage will be displayed even if the fuse has blown 2 Constant Current Source A current source can be connected across the supply to draw between 4 75mA and 1050mA This is controlled by the microprocessor and is used to drive a current to trip RCDs or to drive a switched current to measure loop resistance In general this current is not there long enough to measure with a multimeter However on an RCD tester the a c selective type test can be used and the test current will flow for 2s This current will be nominally 5 higher than the rated current as EN6155
49. t 5 gt 0 0V D gt 5 gt 15 gt 15 L 45V SWITCHED gt 0V S Power Supply Psw OFF N p SW 5V Power POWER OFF POWER OFF TEST KEY ON NMI 4 3 2 Temp TR TempR Sense ZERO CROSS 50 Zero Cross ZERO CROSS 50 Micro TEMP TR TEMPR BACKLIGHT I SENSE ZERO CROSS 1 DIFF OUT DIFF OUT ZC SELECTI1 2 ZERO CROSS 2 Volts L N Shifted SE SELECT 1 2 Volts L E Shifted RANGEA Volts N E Shifted RANGE A PL24 RANGE B Zero Cross IK RW 2ndF A 2nd DAC xp 5627 2 1 2nd F B TENABLE 2 LOADED 2ndF B i LOOP TEST PL2 ZC2 UNLOADED s a OOP TES ZERO N 8 DAC Differance Circuit ZERO CROSS SELECT ZERO CROSS l x10 pe ZERO CROSS SELECT DIFF SELECTI1 3 E DIFF_SELECT I 3 228965 IIND m Volts L N S is LoaDED EU v Volts N E ZERO CROSS 50 Volts L E High Gain DIFF OUTIB POWER OFF DIFF GAIN SW 5V Volts N E High Gain DIFF GAIN TE LED DATA FED CIK LED DATA Es LED CLK LED CLK NMI i ENE KEYS CLK KEYS LD Level Shift TEST KEY RELAY N E KEYS DATA RELAY L N CONF DATA Micro Volts L N Volts L N Shifted FE Volts L E Shifted CONF DATA hvolts L E Volts L E Shifted P KEYS DATA TEST KEY Volts N E Volts N E Shifted Keys Config KEYS LD KEYS DATA
50. tion if present Connect to loop resistance close to suggested value and press the test button 953 50 digits 165 14 digits 90 5 digits Hi Current Loop Test 20 1 5 ohms 10 1 ohm 8 digits 3 digits 953 50 digits 165 14 digits 90 5 digits No Trip Loop Test 20 1 5 ohms 10 1 ohm 8 digits 3 digits Checking No Trip Loop Test Current The No trip loop current is intermittent and cannot be measured directly with a multimeter However the magnitude of the current is the same as that used during a 30mA I rcd test On an LT310 this check cannot be performed On an LRCD210 or LRCD220 select 1 2 and 30mA directly on the rotary switches On an LRCD200 or LT320 proceed as follows 1 Switch the instrument on while simultaneously holding down the TEST button the upper left hand button and the upper right hand button 2 The instrument should display CUS Release the buttons 3 Press the TEST button The instrument should display a 3 digit code e g L2R 4 Press the upper left hand button until the code is RIR 5 Turn the main rotary switch to accept the new code Do not switch OFF an LRCD200 select T 30mA 6b On an LT320 select No Trip and Z Now perform the measurement 1 Connect an a c current meter to measure the current
51. tion of the middle switch in the row of three LK3 is the closest link at the upper left The orientation is north south Method 2 disassembled instrument Move the range switch to the diagnostics position This is located beyond the normal operating positions The exact location depends on instrument type Method 3 assembled or disassembled instrument Send the serial command W Method 4 fully assembled instrument Use the secret menus With the instrument switched OFF hold down the TEST button the top left hand button and the top right hand button then turn the range knob to any ON position Keep the buttons held down until the instrument displays the current operating mode normally CUS customer mode Now release the buttons Press the LOCK DEGREF button until the display shows NOS Hold down the top right hand key and then press the left hand key The display shows Press the TEST button to begin the first diagnostic test Diagnostic test sequence Test 1 Display All display segments backlight led neons and all power supplies are turned on Hold down any button except the TEST button to sound the buzzer Press the TEST button to step to the next test Test 2 Keys Message KEY The neons and 15V supplies are turned off Hold down any key The display shows a code according to which button is pressed Top row left LEF Top row ce
52. wn separate the bottom from the top taking care not to damage the battery lead 4 To remove the printed circuit boards unplug battery lead and remove the two securing screws see picture page 5 Do not remove the screw in the centre of the rotary switch s unless you want to take the switch apart 5 Lift the terminal block and the pcbs will follow 6 Note position of the rotary switch s as shown in picture on page 9 so that it can be returned to this position for re assembly Note that to retain calibration the printed circuit boards need to be replaced as a pair Re assembly 1 Ensure that the rotary switch and the knob are both in the OFF position 2 The battery connector can be fitted either way round since positive is the centre pin and negative is both outer pins Take care not to trap the battery lead 4 Do not over tighten the four case screws they screw into plastic Miscellaneous notes e Relays and Fuses are fitted only if required depending on model Replacement printed circuit board assemblies are available from Megger Sales These board pairs are tested calibrated and set up for specific models 11 F53 I BOARD TERO SKIL LE A SK12 AG RL2 E
Download Pdf Manuals
Related Search