Caterpillar VR3 - SE AVR fuses are blowing
Caterpillar VR3 - SE AVR fuses are blowing
(OP)
Dear friends i am new guy for this forum and right now im repairing 2 catepiller generators which are having VR3 - SE AVR Unit. both units having 2 fuses fixed outside and both fuses are blowing when the generator starts at once.
if anyone having experience about this problem pls let me know what is the problem and how to solve it. new AVR is very expencive and if anyone having circuit diagrem of this AVR pls send it to me to repair it by myself.
Thank you
hemantha soysa
if anyone having experience about this problem pls let me know what is the problem and how to solve it. new AVR is very expencive and if anyone having circuit diagrem of this AVR pls send it to me to repair it by myself.
Thank you
hemantha soysa





RE: Caterpillar VR3 - SE AVR fuses are blowing
The fuses are installed in 2 of the 3 voltage sensing leads (assuming 3 phase sensing). A short to ground in the exciter field (connected to F1 & F2) could cause these fuses to open. Failure of the regulator itself is also quite possible. In that case, you would need to upgrade to a VR6 AVR, as the VR3 is obsolete.
Service manual is SENR3904, which can be purchased from local Cat dealer.
RE: Caterpillar VR3 - SE AVR fuses are blowing
thanks for ur valuable information