CAT AVR TYPE D.V.R. FOR A SR4 GENERATOR
CAT AVR TYPE D.V.R. FOR A SR4 GENERATOR
(OP)
HI, WE HAVE A SR4 GENERATOR WITH A DVR AVR, RECENTLY WE CHANGE IT WITH A SIMILAR OTHER, BECAUSE THE GENERATOR ARE TRIPING WITH OVERVOLTAGE 750 VCA ( 480 VCA NOMINAL ) ITS WORKS FOR A WHILE AND THEN THE SAME FAILFURE, IN TERMINALS 20-22 WE HAVE 380 VCA F1-F2 90 VCD THATS THE ONLY MESUREMENTS WE HAVE, THE SENSIG VOLTAGE IS DIRECTLY FROM LV LEADS. CAN YOU HELP US PLASE.





RE: CAT AVR TYPE D.V.R. FOR A SR4 GENERATOR
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: CAT AVR TYPE D.V.R. FOR A SR4 GENERATOR
The issue may be outside the DVR.
Essentially there is not enough information to comment and there are too many variables. You need a CAT field service technician on site.
Check all connections and wiring, settings in the software if applicable, such as VT ratio. You may be better off using VTs with 120V secondary.
Rafiq Bulsara
http://www.srengineersct.com
RE: CAT AVR TYPE D.V.R. FOR A SR4 GENERATOR
Loss of sensing
Open in droop CT circuit
DVR failed
Loss of 24 VDC to DVR
CAT offered the DVR in three possible sensing voltage ranges, 120, 240 and 480. All three used nominal 120 VAC power input from either PM or transformer for SE
480 was least common, 240 was most common, 120 was usually only seen on MV (2400 to 13,800V) machines with sensing VT's
CAT manual number is SENR5833, sorry I don't have a copy anymore, try your local CAT dealer for a copy.
Hope that helps
RE: CAT AVR TYPE D.V.R. FOR A SR4 GENERATOR
RE: CAT AVR TYPE D.V.R. FOR A SR4 GENERATOR
There was also a series of part numbers several years ago that had a problem with the internal sensing connections that could be a cause of the problem you're seeing, ut would likely have been corrected when you put on the newe DVR.
Some 4 and 6 lead machines had center tap sensing that was problematic after some years in service, the field fiw was usually a 2:1 sensing transformer.
What is your rated sensing voltage, should be on the part number tag of the DVR? If you can't read it what is part number of DVR?
RE: CAT AVR TYPE D.V.R. FOR A SR4 GENERATOR
serial number UEMDE 6498
Ratio of output voltage to sensing voltage is 2.0
Generator output voltage 480 V