G3500 Generator Sets Caterpillar


Varistor - Check

Usage:

G3516 CPG


Slika 1g00677004
Vezalna shema generatorja PMPE
(CR1–CR6) Diode
(CR7) Varistor
(L1) Polje vzbujevalnika (stator)
(L2) Rotor vzbujevalnika (rotor)
(L3) Glavno polje (rotor)
(L4) Glavni rotor (stator)
(L5) Rotor pomožnega vzbujevalnika
(PM) Permanentni magnet
(RFA) Sklop vrtljivega polja
(CST) Transformator, ki ga zagotovi kupec

Ohmmeter

Za preverjanje varistorja (CR7) lahko uporabite ohmmeter. Priklopite ohmmeter na varistor. Upornost mora znašati vsaj 15.000 ohmov. Če je upornost manjša od 15.000 ohmov, je varistor okvarjen.

Preizkusna lučka



Slika 2g00555113
Preizkusna lučka

Glejte preizkusno lučko, ki je prikazana na sliki 2. Če želite preizkusiti varistor, opravite ta postopek:

  1. Odklopite enega od vodov varistorja (CR7).

  2. Priklopite preizkusno lučko na varistor.

  3. Opazujte rezultate. Lučka ne sme svetiti.

  4. Zamenjajte voda preizkusne lučke.

  5. Opazujte rezultate. Lučka ne sme svetiti.

Če preizkusna lučka sveti v eni ali drugi smeri, je v varistorju prišlo do kratkega stika. Zamenjajte okvarjene varistorje z varistorji, ki imajo primerljive značilnosti delovanja. Ko naročate nadomestni varistor, navedite naslednje informacije:

  • številka dela varistorja,

  • serijska številka generatorja.

Po zamenjavi varistorja preverite, ali so trakovi voda magnetilnega navitja trdno naviti na gred. Preverite tudi, ali so trakovi voda magnetilnega navitja trdno zvezani.

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