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Thanks! The ship power class is 450VAC. Shore power specified is 505VAC. I didn’t see a conductor in the receptacle for ground which is what is making me wonder. All lines appear to lead to the switchboards. I’m wondering where that ground would connect. I’ll read through the IEEE...

When a ship is on shore power, is anyone familiar with the standard practice for providing an Earth Connection? ABS talks about a requirement as does DNV. The requirement is vague (just says an earth terminal/connection is required) and I’ve never actually seen one on the ships that I’ve...

Thanks everyone! Update...I've gotten back some information from the company referenced earlier (PRETECH). This looks like the easiest solution....basically turn key. The engineer explained that their Solenoid Coil Monitor works by sending a small ac current through the wire and solenoid at...

Itsmoked, I've been reviewing the Productivity 2000 modules and haven't been able to pinpoint the exact module yet but still reviewing. I did complete my review of this DIN rail mounted device made by Pretech. This looks similar to the solution that VEIBILL was referring to as well. The...

VEIBLL, thanks for the great reply! I'm looking for a PLC output card that can do this. I assume you are saying to program a PLC output card to pulse constantly and measure current. The PLC output card would also need to be able to actuate the solenoid as well?

Yes, the brake is fail safe. The springs set the brake and the solenoid releases it. So, you need power to release the brake. However, the issue comes when you "must" release the brake in order to open the door/hatch. If the solenoid or wire to the solenoid is burned out, the brake won't...

Thanks for the great replies. The biggest difference between this application and something like a light is that we really need to detect if the solenoid is bad before we try to use it. That’s what seems to make this more difficult because the solenoid will be off. Also, the solenoids we’re...

We have several electro-mechanical actuators with fail safe brakes which release using the solenoid. If the solenoid doesn’t release the brake, the actuator won’t work and hatches/doors won’t open. I’d like to find a way to monitor the solenoid coil when the actuators are not in use....they sit...

Thanks for the reply! Sorry I didn’t see this sooner. I agree with your recommendations on fail safe and redundancy. We have several electro-mechanical actuators with fail safe brakes which release using the solenoid. If the solenoid doesn’t release the brake, the actuator won’t work and...

Does anyone have experience setting up a system which monitors a solenoid valve’s health? I have a situation where the solenoid will sit unused for long periods of time but we need some reassurance that it will operate when power is applied.

That does change BCWP but it doesn't impact ACWP. I need to track ACWP using spent hours that get reported to me weekly. Project isn't calculating ACWP for anything that is completed ahead of schedule...even though we are completing work and incurring cost.

I've spent the day trying to figure this out...one more piece of info. It appears that MS Project is not calculating actual costs for any work performed ahead of schedule. So, I have resources that have completed 50% of a task (and spent 50%) of the budget but my schedule shows they should...

Thanks everyone! Great info.

I have been attempting to use MS Project to track my hours spent on a job, remaining work, percent complete, etc. I was recently asked to start tracking the earned value data as well....So, I saved a baseline, loaded labor rates and got some good data. The problem is, my ACWP does not agree...

Thanks all! It sounds like there isn't a required specification but several that could be used as good practice? The product is basically an alarm clock. I see that the ones in my house are UL listed. My understanding of UL is that you have to do more than follow a standard to stamp UL on the...

I'm finalizing a design for a simple household electrical component. I assumed NFPA 70 was the applicable code but it seems to only apply to household wiring and actual equipment installations. Is there a code or standard for the actual equipment design and wiring?

IRstuff/panelman, for some reason I didn't consider switching to analog inputs but it sounds like that would work. The resistance over the cable run is so negligible, I think a basic resistor would do the trick. Controlsdude, I am looking around for modules that have this built in feature...

Interesting. In your example, the cylinder is being controlled by the PLC too, right? In many cases, the I/O is triggered by external events (not something the PLC commanded). For example, over temp switch on a motor or limit switches on manual type equipment. So, the PLC would not be able to...

I have a PLC with several inputs to various field devices with open/closed contacts such as limit switches and proximity switches. For some time now, I've been trying to figure out a way to detect a faulted or broken control wire to one of these devices. To me, the PLC would see would see...