leg5840 Posted July 19, 2023 Posted July 19, 2023 Problem: Started only the right engine at 0:41, confirmed that the JFS LOW caution disappeared, and turned off the engine of ENG and JFS. In order to de-energize the jfs start relay, I turned off the S/W in advance, turned on the switch at 0:58, and tried single bottle start, but no JFS START At 1:06, JFS is started with the double bottle start position. At 1:42, both engines were started to induce charging of the jfs bottle, then the engines were turned off. After that single bottle start worked fine. principle of operation: The JFS Accumulator must be charged with UTY' B and either pressure when the UTY PUMP is running. The JFS LOW caution disappears when the JFS Accumulator is charged. guess First, it is speculated that the JFS LOW caution simply disappeared over time, even though the jfs bottle was not fully charged due to the insufficient UTY' pressure of the right engine. Second, I guess that the JFS LOW caution itself is a false indication.
strikeeagle Posted July 21, 2023 Posted July 21, 2023 On 7/19/2023 at 8:30 AM, leg5840 said: Problem: Started only the right engine at 0:41, confirmed that the JFS LOW caution disappeared, and turned off the engine of ENG and JFS. In order to de-energize the jfs start relay, I turned off the S/W in advance, turned on the switch at 0:58, and tried single bottle start, but no JFS START At 1:06, JFS is started with the double bottle start position. At 1:42, both engines were started to induce charging of the jfs bottle, then the engines were turned off. After that single bottle start worked fine. principle of operation: The JFS Accumulator must be charged with UTY' B and either pressure when the UTY PUMP is running. The JFS LOW caution disappears when the JFS Accumulator is charged. guess First, it is speculated that the JFS LOW caution simply disappeared over time, even though the jfs bottle was not fully charged due to the insufficient UTY' pressure of the right engine. Second, I guess that the JFS LOW caution itself is a false indication. Also, the JFS bottles can be charged using a hand pump when the engines aren’t running which is a PINTA for the Crew Chief. [sIGPIC][/sIGPIC] Chris
leg5840 Posted July 21, 2023 Author Posted July 21, 2023 3 hours ago, strikeeagle said: Also, the JFS bottles can be charged using a hand pump when the engines aren’t running which is a PINTA for the Crew Chief. sorry, what is PINTA?
leg5840 Posted July 21, 2023 Author Posted July 21, 2023 3 hours ago, leg5840 said: sorry, what is PINTA? Is it Pain In The Ass?
strikeeagle Posted July 21, 2023 Posted July 21, 2023 13 hours ago, leg5840 said: Is it Pain In The Ass? Yes -- should've been just PITA, no "N" 1 [sIGPIC][/sIGPIC] Chris
leg5840 Posted July 22, 2023 Author Posted July 22, 2023 23 hours ago, strikeeagle said: Also, the JFS bottles can be charged using a hand pump when the engines aren’t running which is a PINTA for the Crew Chief. It's tough enough to add to CrossFit's wod.
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