...1 for 2-wire start stop. With a little trimming on the Analog offsets, scaling values, etc, you can nail it down to perform very accurately.
*Poof*. Now you've got a legit start/stop and speed reference using just a 4-20mA. I've done this several times on various projects; works like a...
Thanks for the feedback guys; I think a thermal is an option we can ask for from the manufacturer (cheaper that way). Waiting for feedback from them now.
I have a 1/20 HP motor on a reducer, 115V. I want to plug this into the wall. The motor doesn't include any sort of thermal protection / OL protection. For 1/20 HP, am I required to provide additional protection aside from the 15A branch circuit protection i.e. circuit breaker?
I keep...
Hello, I'm typically in the electrical forums so bear with me and feel free to move this post if it's in the wrong spot.;-)
I want to bond one face of a piece of 3/8" aluminum angle to another piece of black anodized aluminum plate. Mechanical fasteners are not my first choice, so I'm seeking...
Subject line kind of spells it out; I'd like to put some GUI to a VFD application, but I don't know if I like the idea of needing a PLC in the loop. I'm a RS-485 / ASCII / Modbus virgin; having a hard time figuring out where I need to start.
I've looked at a few panels on Automation Direct...
Hello,
I will be traveling to a customer location on Wednesday to investigate the failure of some of our products. We strongly believe that it's power quality related; it seems that a brown-out keeps killing said product. Upon initial startup, the device has a pre-charge circuit with a...
Yes, like Keith said; anything over about a 5HP motor will become cost prohibitive to do this.
You will want to make sure the VFD is capable of 1PH operation, and you will also be required to roughly double the size of the VFD to accommodate the loss of the third phase. (5HP motor takes a...
Osmosis,
Yea, the AB 4M and the Delta "E" series both roll off the same manufacturing line. Power sections are identical, with the only difference being aesthetics and some interfacing options.
What I stated is in no part speculation or hearsay; in my business, we rely on long lead low HP VFD and Motor systems. It's our bread and butter, and the primary function of my position with the company is to make sure this stuff works.
I have worked closely with Rockwell Automation in...
Ozmosis,
The VFD was on the open bench, with a relatively default parameter set (this was done a few times ;-). I also have an Allen-Bradley 4M of the same HP class; I think it's just an inherent property of these little package drives. Guess I need to shop around.
Thanks guys for all the...
No.. this is an AM motor. (insert "haha" here).
What I've got is a Baldor 1 HP 3 phase induction motor. I don't think field weakening is an option Keith; while this little drive has a lot of bells and whistles, V/Hz manipulation or anything else regarding the power section is pretty...
I've considered trying a reactor; the only downside to that, even if it works, is that we're trying to keep our enclosure's heat load to a minimum. Our last resort is just changing from a 6:1 speed range to a 4:1. Hate to do it, but.. *shrugs*.
Loving your siggy btw...
I've hit a brick wall with a Baldor 1HP motor and a Delta VFD"E" series drive. For a 460V blower application, I want to run the motor at 10~60 Hz. The motor is rated 10:1, and my PWM is set to 15kHz. When this motor is running between 10 and 15 Hz, it cogs. This cogging is translating...
In my experience, mostly with low HP and long lead lengths, solid core is a no-no. HF cable charging currents are always higher on solid; the higher currents are due to the "skin effect" or the fact that your dealing purely with surface current. The surface current is directly underneath your...
LionelHutz, you are correct. A properly sized alternator does not yet exist. The goal is to maximize power capture of a blade set, with the limiting factor being wind speed and rotor diameter. Only after we settle on an optimized blade design will we attempt to design an alternator for the...
When we connected my PM motor as a basic generator, this is what we got for performance data:
http://i35.tinypic.com/no8pol.jpg
I would like to us this as my dynamic load for the rotors under test in the dyno setup. The more I talk about this, the more I feel like I've got it licked; 3 phase...
..in addition, I guess the only thing about the DB setup is that I will be using it at 100% duty cycle. I should probably go ahead and dig out my safety glasses.
