Recent content by hooverdale

Hello Everyone, This was exactly what my boss told me. Its convincing. I also pointed this out to the VFD supplier that why allow the motor to run in an overload condition for a long period of time. Why not oversize the motor instead? Unfortunately, i got no valid answer from them. This...

Hello Everyone, Thank you all for your inputs. Yes we end up buying the 60HP VFD and Softstarter. What i don't understand with the supplier explanations was the reason why they oversize it because they said the application is for flood control and water can get slurry so pump will draw higher...

Hello Everyone, I know a there are a lot of vfd expert here. So here's my question. We have a pumping station project for dewatering application that will be used for flood control. Composed of two (2) units Teral Submersible Pump Model 600AAX-637 rated at 50HP, 400V, 3Phase, 60Hz. Controlled...

I did a revision on the report to make it more straight to the point that they shouldn't have done the welding with electrical equipment connected. What do you guys think? Thanks...

Thanks Keith, I coordinated with our pump distributor and asked them for a quote so i can have it attached in the incident report. By the way, i forgot to ask is it allowed to conduct a welding works on a material with an electrical equipment connected to it? If so, what are the restrictions...

Thank you Keith, Bill and Scenery. With the information gathered from you guys, i had it all written on my incident report. [bigsmile] Please read it and i'll be glad to hear any feedback. See attached doc. Thank you...

Hello Everyone, Thank you for your response. I did a search on the sump pit and tried to find other clamping point but i haven't seen anything. The pump ground wire was tapped to the controller and it ends there. I have no background on welding sir, is it normal for a clamping point to...

Thanks for your immediate response sir. Sorry about the jpeg. I'll try attached it again in pdf. (See file) We had this reported initially to the plumbing contractor that the welding was the caused of the fault but their argument was " Why it doesn't happen to other sump pits?". Because they...

Hello Everyone, We have this situation on site where the ground wire of a submersible sump pumps were totally burnt out. (See attached photo) Its a two (2) units submersible sump pump rated at 5HP, 400V, 3Phase, 3500RPM. Controlled by a Duplex type DOL controller 5HP, 400V, 3Phase. The reason...

Just connect the NC contact of your overload relay at the very start of your control circuit. Once the overload trips and your NC opens it will break the circuit thus unlatching the contact that holds the contactor. That way resetting the trip button won't start the motor unless you manually...

Hi everyone. Sorry for the late feedback. We tested it again running in full load and got 62A. And we found out that one of the sub-breaker is also heating up. It's a 30A, 3Pole, 440V used for one of the ACU, measured 15A. We used a temperature laser gun to measure exact temp. Here's the...

Its like a hot cup of coffee left to cool down for 10mins. Sorry i can't really tell how hot exactly. We don't have thermal infrared imager or sensor. Lets say the breaker is not defective nor the main feeder termination and lugs, is it overloading? We are planning to increase its size to 150A.

Hello Everyone, We have panel board used for commercial purpose with 100A 3Phase 440V main breaker Model GE TCD134100WL, size of main feeder is 30mm2 THHN. Loads: Lighting and Outlet, Aircon, CCTV. Power Supply : 440V, 3Phase, 4Wire No voltage imbalance.230V single phase load used line to...

The standard set-up for CCTV power supply if you have several sets of cameras is to have a centralized 12V supply and have it distributed to all the cameras. Or for a single camera you can plug its 12V cctv power adapter to 220V outlet. I was thinking, is it advisable to just wire several...

Better to check with the said hospital. They are the one who will approve your design anyway. If you can't find any, use the the previous data you had from the other State, there shouldn't be a big difference.