Hi all, I have a question regarding cooling an enclosure housing one or two VFDs. Maybe this belongs in the Heat Transfer and Thermodynamics forums, but I will start asking it here. Let's say I use a tool such as the Hoffman NVent Cooling Selection Tool to determine the size of a VFD enclosure I...
Good day, I am helping a machinist getting some equipment operational that he has purchased with mismatched voltages. I'll lay out what he has:
-240V single phase power
-51kVA 230 - 460 step-up transformer
-12.5HP 460V lathe
-3HP 575V mill
-A tight budget
My plan is to use an oversized 480V...
Hey everyone, in my region we help a lot of farmers set up 3-phase motors for their grain augers or dryers from their single phase 240V service by using oversized VFDs. Occasionally I will have a customer who needs a weatherproof enclosure in order to install the drive outside near the...
Hi everyone, I've got a customer who set up a TechTop TD350-011G-2 VFD for a 15HP pump application. On a whim he measured the input current, and measured 60-62 Amps. This is about 20 Amps higher than the VFD's rated input current, and he measured this range on all three input phases, which tells...
I have another question regarding brake resistors. I understand the theory and application of using a brake resistor to quickly stop a high-inertia load and protect the drive from tripping due to overvoltage reasonably enough. But I am wondering how one would spec a brake resistor for a shaking...
Hi, all. I work in VFD and electrical controls sales, and I have a customer who is looking to apply some faster braking to his VFD driven motor when he is balancing straw choppers. We are driving a 40HP 1725 rpm motor, being run at a top speed of 1294 rpm. He did some experiments and recorded...
