wirebender
Senior Member
- Location
- North Central Texas
When calculating the load for an optional standby generator how do you figure motor loads. I seem to recall something about locked rotor amps but can't find it now.:-?
Generator load
- Thread starter wirebender
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bphgravity
Senior Member
- Location
- Florida
Don't worry about the LRC of motors when sizing optional standby systems. Just use one of the methods outlined in Article 220. Motors are covered in 220.50, which refers you back to Article 430.
When all is said and done, you simply need to add 25% to FLC of the motor load.
When all is said and done, you simply need to add 25% to FLC of the motor load.
wirebender
Senior Member
- Location
- North Central Texas
roger said:
The generator. Actually the guy I am helping with this already has 25kw generator and I'm just trying to make sure it's big enough. The load is all lighting except for one A/C unit. LRA is 170, RLA is 26.6.
kingpb
Senior Member
- Location
- SE USA as far as you can go
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- Engineer, Registered
I've never heard of this approach.
If you dump to much load onto a generator, it can go into load rejection. due to either simple overload, or even caused by a single large motor starting.
Best to due a load analysis to make sure the gen will recover properly. CAT makes a simple program (downloadable off internet) that works for simple installations, and it easy to use.
If you dump to much load onto a generator, it can go into load rejection. due to either simple overload, or even caused by a single large motor starting.
Best to due a load analysis to make sure the gen will recover properly. CAT makes a simple program (downloadable off internet) that works for simple installations, and it easy to use.
wirebender
Senior Member
- Location
- North Central Texas
Thanks, Bryan.bphgravity said:
kingpb said:
I can't seem to find where to download this.:-?
kingpb
Senior Member
- Location
- SE USA as far as you can go
- Occupation
- Engineer, Registered
I will find it and post a link.
wirebender
Senior Member
- Location
- North Central Texas
kingpb said:
Thank you, sir.
kingpb
Senior Member
- Location
- SE USA as far as you can go
- Occupation
- Engineer, Registered
The link will get you to the registration page. It seems you may now have to contact the local dealer and then they will send you a disk, but it is free.
http://www.cat.com/cda/layout?m=37508&x=7&f=111183
If your out and about and drive by a CAT dealer, they should also be able to give you one at the service desk.
http://www.cat.com/cda/layout?m=37508&x=7&f=111183
If your out and about and drive by a CAT dealer, they should also be able to give you one at the service desk.
wirebender
Senior Member
- Location
- North Central Texas
kingpb said:
Thanks, kingpb. That's what I was understanding from the web site but figured I just wasn't looking in the right place.
I appreciate your help in this.
wirebender
Senior Member
- Location
- North Central Texas
Wow, I just got a call from Caterpillar and the guy said they saw me poking around the website and wanted to know what I was looking for. I told him I was looking for the calculator and he said he would send me one.
Don't know how I feel about that. Is it good salesmanship or kind of pushy? I would hate for every website I visit to call me personally.
What do you guys think? For those of you who have websites do you or would you use this marketing technique, calling people who visit your site?
Don't know how I feel about that. Is it good salesmanship or kind of pushy? I would hate for every website I visit to call me personally.
What do you guys think? For those of you who have websites do you or would you use this marketing technique, calling people who visit your site?
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