Hi,
I need to make a field repair that entails digging up, cutting and re-flanging 2 inch sch 80 ASTM 106B (2000 psig hydraulic line) pipe.
The pipes are close together and the limited access area makes welding difficult.
The finished flange ends will have a masonry access box built around them...
Hi,
I'm purchasing some sub-meters for main switch boards.
Typical installation will monitor total three phase power used on 480/277 three phase wye branch circuits leaving the main switch board and feeding remote distribution boards.
Can I do this with only ABC phase ct’s not monitor the...
Hi everyone,
I hope you can clarify something for me. (I'm an automation guy, so I'm accustomed to controlling pumps, but know little about pump specs).
I need to replace a defective booster pump. It is one of three over-sized 25 hp pumps (on VFD control) and expensive and time consuming to...
Hi,
In industrial process control we have ISA-95 as an acceptable standard for automation to enterprise system integration.
What would be the equivalent standard to apply to integrating the existing building systems data (hvac, fire, security, etc) into an enterprise system of a large hotel...
The general consensus from the inspections is the MOV's did what they should have, however something blew all three fuses. At that time or at later time, a phase to phase arc between the metal lugs at the disconnect produced enough of a blast to blow a lead wire off. What triped the main, the...
One of the bad units had a loose lug (the first actually) and we thought we found the problem. However all three others had lugs tight and inplace. In every case the event had enough energy to completely melt off one incoming #4 awg copper lead. Once this unprotected lead was loose there is...
Hi Guys,
If I turn off the TVSS disconnect I still have the bare input lugs that can arc, but no longer have MOV's to try and clamp the voltage.
This may actually case more of an arc chance on the input side of the disconnect.
Right now I can't do much modifying. I have to wait on GE and the...
Hi,
I am at a large convention center that has forty 4000 amp 480/277 main switch boards.
Each main switch board is feed from an independent utility owned 12kv to 480/277 transformer.
The transformer has no lightning protection on the secondary side. The main switch board has a N-G main...
Hi Everyone,
I need to add a 30 kva indoor transformer inside an existing indoor air conditioned electrical room. The originally installed existing transformers sit on 2 inch raised concrete pads.
The electric room is dry, has a concrete floor and the transformer I am installing has 2 inch...
Hi Guys,
Can someone help me figure out which of the below pins I need to connect.
I am using modbus RTU on a 2 wire RS485 link, and I want to connect the (master)PLC's rs232 to the (slave)VFD's RJ45.
Thanks,
Andy
--------------------
Automation Direct
Direct06 D0-06AR PLC
RS232 port
Port...
Hi Guys,
I have a low tech question. I need to install some panic buttons in remote toll booths to tide me over a few months until a real security system can be installed.
I have had the phone group install a phone jack and a house phone extension in each toll booth. Each phone line is...
Hi Guys,
Looks like I might have accidentally spec'd the right drive after all.
Looking at the Automation Direct catalog any drive over 10 hp goes to the GS3, regardless of the application.
The GS3 has svc but also has a parameter that allows you to choose the application; constant or...
Hi Guys,
I have two questions I'm hoping you can help me out with.
Question: 1) Is there any technical reasoning to use a sensorless vector drive on a water pump application that would justify the extra (10% ?) cost?
background of question 1:
I replaced a Square D omegapak installed in 1995...
