Thank You Keith,
I share your concern here, and have passed along said concerns to the "uppers" in charge. Not sure when it happened, but it twas a sad day when the politicians and bean counters took over maintenance priorities.
Thank you all for your input to this thread. Found the culprit last night. Actually it was several things which led up to a chain of events. First off, circuit breaker settings were too low. This contributed to the drop out of all three. The initiating problem turned out to be dirty power...
Thank you for the responses. (DPC) One of the first things I did was ask for the breaker settings. The CG 835 also questioned this. These were not available onboard. However, this would not seem to account for it running for a long time without issues.
(Waross) I will check to see if there...
As some of you may have surmised, I work for an agency which operates marine commerce vessels. Please forgive me for not providing additional details, as I am in a very politically charged situation.
I was called in to troubleshoot an event which popped up recently. The vessel normally runs...
Hi folks, "Heard" about an interesting possible electrical safety hazard today. This was at a shipyard (saltwater) where work is performed on vessels moored at a pier. The shore power for the vessels is 480. This is supplied by a Square D SE series breaker, 1200 Amp. This in turn fed...
Now here's a possibly funny one. Today we were discussing the relative merits of having sight glass tubes versus using magnetic and other types of sensors. I kind of "off the cuff", related how an old ships engineer had once told me he could tell the viscosity of an oil by reading it's...
Thanks for the input folks,
I guess it just comes down to personal preference of chamfering tools. No input as to the brush seating grit? Again, we use only 80 grit paper, nothing finer.
For those who are into this stuff, we recently had an interesting comm problem. Someone left a...
Hi,
I work on large DC propulsion motors. There has been a lot of problems with commutators lately. Personally, I feel this may have to do with outdated AC to DC rectification issues. But, that would be for another thread. What I would like to talk about is favorite ways to undercut and...
I am putting this out here for thoughts on whether or not it might be more advisable to service particular circuit breakers "in place", by a qualified vendor, versus removing them and sending them out to a qualified shop to be serviced. I will not mention my employer, as the job...
Hi Folks,
I was called in to assist with the cable pull for power feed to a couple of ABB VFDs. They will be controlling two 75 hp 3 phase 480 motors, non-simultaneous use.
The cable provided is DLO 3/0 to be run parallel, 2 runs of 4 cables each, 60 and 120 feet respectively.
They have...
Anyone bored and ready for a fun exercise? I recently came across an old Cat generator (rather large) with no nameplate data readable except the name. It has 20 leads coming out of it. None of the leads are ID'd. I suspect that it may be the "two gens in one" program. Wondering if anyone...
