Updated Current Transformer (CT) Ratio Values are Now Used On Certain Cat® Generator Set Engines {4476, 4490} Caterpillar

Engine

C9 (S/N: XP71-114)

Generator Set

XQP150 (S/N: PJ71-149; PJE1-119)

XQP300 (S/N: XPL1-127)

Description Of Change: Updated Current Transformer (CT) ratio values are now used on the engines that are listed above. The updated CT ratio values ensure proper functioning of the Generator Set.

Adaptable To:

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Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.

The following changes are adaptable to the engines within the listed serial numbers, and are effective with all engines after the listed serial number.

The updated CT ratio values are given in Table 1.

Table 1

Cat Genset Model	Winding Configuration	Breaker Size	Correct CT Ration (:5A)
XQP60	Series Star	125A	150
XQP60	Parallel Star	200A	200
XQP150	Series Star	250A	300
XQP150	Parallel Star	630A	600
XQP275	Series Star	630A	600
XQP275	Parallel Star	1000A	1000
XQP300	Series Star	630A	600
XQP300	Parallel Star	1000A	1000

Reprogram the CT ratio value in the control panel by connecting to the EMCP4 using the Cat^® Electronic Technician (Cat ET) Service Tool and navigate to the "Configuration" screen and then to the "Generator Current Transformer Primary Winding Rating" setting.