Cebora 965 Скачать руководство пользователя страница 16

CEBORA S.p.A. 

16 

 

3.3.9

 

- Transfer arc does not take place or is too weak for cutting. 

 

PILOT ARC OPERATING TEST. 

Correct? 

‰

 

Pilot arc lights normally, pilot arc stable. 
 
 YES 
 
 NO 

 

Go to par. 3.3.8. 

 

TRANSFER ARC SWITCHING TEST. 

Correct? 

‰

 

Control board (6), connector J2, terminals 1 and 2 = 0 Vac, reed contact closed, with transfer 
arc, thus while cutting (24 Vac reed contact opened, with pilot arc on). This situation remains 
constant for as long as cutting continues. 
 
 YES 
 
 NO 

 

Make sure reed bulb (42) is properly mounted in the corresponding solenoid (43). 

 

With the power source off, make sure that the switch in the reed bulb (42) is 
working properly: move a magnet near the bulb and check the resistance between 
the terminals 1 and 2 of J2 on control board (6) = 0 ohm (reed contact closed). 
Move the magnet away from the bulb; resistance = approximately 5 Kohm (reed 
contact open). If incorrect replace reed bulb (42) and solenoid (43). 

 

Replace control board (6). 

 

TRANSFER ARC SOLENOID VALVE EL2 (34) TEST. 

Correct? 

‰

 

Solenoid valve EL2 (34) terminals = 230 Vac with transfer arc, for the entire cutting time. 
 
 YES 
 
 NO 

 

Check wiring between EL2 (34) and terminals 2 and 8 of J7 on control board (6). 

 

With power source off, check resistance between terminals of EL2 (34) = approx. 
2500 ohm. If 0 ohm (short-circuit), replace EL2 (34) and control board (6). 

 

Replace control board (6). 

 

With power source off, check the resistance between the terminals of solenoid valve EL2 (34) 
= approximately 2500 ohm. If >Mohm (winding broken) replace solenoid valve EL2 (34). 

 

Check connections between torch cable electrode terminal, HF transformer (31) secondary 
winding and rectifier (32) negative terminal; between earth cable, output terminal (21) of the 
power source, solenoid (43), and rectifier (32) positive terminal. If you find any deteriorated 
connections, reset them and replace any damaged components. 

 

Check the condition of the electrode, nozzle, nozzle holder and swirl ring of the torch. 

 

Check the presence of the gas at the inlet fitting (B) and that the pressure and flow rate in the 
intake conduit meet the specification values (see Instruction Manual). 

 

Make sure the pressure regulator (E) and pressure gauge (F) are working properly. 

 

Make sure that the gas lines in the power source are not partially clocked, so that the gas 
throughput is enough for the pilot arc but not for the transfer arc. 

 

Replace solenoid valve EL2 (34) and/or control board (6). 

3.302.173 

28/07/04 

Содержание 965

Страница 1: ...CEBORA S p A 1 PLASMA PROF 55 POWER SOURCE art 965 SERVICE MANUAL 3 302 173 28 07 04...

Страница 2: ...ssing 13 3 3 7 In open circuit operation the output voltage is not regular 14 3 3 8 Irregular pilot arc starts unstable pilot arc 15 3 3 9 Transfer arc does not take place or is too weak for cutting 1...

Страница 3: ...les replace them with original Cebora spare parts 1 3 Safety information The safety notes provided in this manual are an integral part of those given in the Instruction Manual Therefore before working...

Страница 4: ...42 to detect the cutting current on the earth conductor of the power source and pilot arc resistors 37 used for limiting pilot arc current and to facilitate the transferred arc operation At the rectif...

Страница 5: ...new tentative When the pilot arc is lit you have approximately 2 seconds to begin cutting after which timer the pilot arc shuts off until the start button is pressed again When the torch with lit pilo...

Страница 6: ...torch replace if aged or damaged Check the condition of the internal power connections and connectors on the electronic boards if you find loose connections tighten or replace the connectors 3 2 Oper...

Страница 7: ...PEOPLE OR PARTS OF BODY BUT ALWAYS TOWARDS AN OPEN SPACE OR THE WORKPIECE Briefly press the torch start button Correct Gas flows from the torch for approximately 90 seconds post gas time The pressure...

Страница 8: ...trol board 6 Check the insulation towards earth of the transformer 44 and fan 39 If leaking or short circuited towards earth replace Mains not suitable to power the power source ex insufficient instal...

Страница 9: ...mately 230 Vac with switch 29 closed both with mains at 230 and at 400 Vac YES NO Check the wiring between terminals J8 and J9 of control board 6 and fan 39 Check the presence of control board supply...

Страница 10: ...torch cable torch button and contact of the nozzle guard on the torch Make sure connection between J1 and J2 on HF filter board 47 Make sure the insulation between torch start button cables and elect...

Страница 11: ...R SUPPLY TEST par 3 3 1 Replace control board 6 With power source off check the resistance between the terminals of solenoid valve EL1 34 approximately 2500 ohm If Mohm winding broken replace solenoid...

Страница 12: ...ponents with damaged terminals Check the condition of the torch cable and torch especially make sure there are no short circuits or insulation leaks between the conductors and that electrode nozzle no...

Страница 13: ...e electrode terminal and between rectifier 32 positive terminal resistors 37 HF filter board 47 and torch cable nozzle terminal If you find loose connections tighten and replace any components with da...

Страница 14: ...Perform START COMMAND TEST par 3 3 3 Replace control board 6 With power source off check the resistance between terminals of contactor TLP 30 coil Corrected value approximately 430 ohm If Mohm circuit...

Страница 15: ...noid valve EL1 34 open and solenoid valve EL2 34 closed during the pilot arc Make sure the power source open circuit working condition performing if necessary tests in par 3 3 7 Check the wiring betwe...

Страница 16: ...n EL2 34 and terminals 2 and 8 of J7 on control board 6 With power source off check resistance between terminals of EL2 34 approx 2500 ohm If 0 ohm short circuit replace EL2 34 and control board 6 Rep...

Страница 17: ...enly heated make sure that the duty cycle is not greater than indicated in the power source specifications If the alarm occurs while cutting and only some of the windings of the transformer 44 are hea...

Страница 18: ...4 Vac contact opened with low pressure 3 2 bar 0 Vac contact closed with suitable pressure YES NO Check the wiring between pressure switch 33 and terminals 3 4 and 5 on control board 6 Check for the p...

Страница 19: ...3 List of spare parts Essential spare parts Ref Code Description Qty 6 5602170 control circuit 1 11 3160166 pressure gauge 1 29 3190243 switch 1 32 3200069 rectifier 1 33 5710129 pressure switch 1 34...

Страница 20: ...put from thermostats on transformer 44 J4 NU J5 J6 output for HF transformer 31 J7 1 7 230 Vac input for control board 6 power supply J7 2 8 230 Vac output to control solenoid valve EL2 34 J7 3 9 230...

Страница 21: ...rawing 5 3 2 Connector table Connector Terminals Function J1 A B start signal input J2 A B start signal output TP3 output voltage input workpiece potential TP4 TP7 rectifier 32 output voltage input TP...

Страница 22: ......

Страница 23: ...ANSFORMER 32 RADDRIZZATORE RECTIFIER 33 PRESSOSTATO PRESSURE SWITCH 34 ELETTROVALVOLA SOLENOID VALVE 35 CONTATTO CONTACT 36 SERRAPACCO PACK HOLDER 37 RESISTENZA RESISTANCE 38 LAMPADA SPIA LIGHT 39 MOT...

Страница 24: ......

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