Not you personally
your baseless assumptions
:thumbsup:
Engineers typically do not operate like that
VFD conductor sizing
- Thread starter Davebones
- Start date
- Status
Not you personally
your baseless assumptions
:thumbsup:
Engineers typically do not operate like that
Can we stick to the topic please?
Now that is the kettle calling the pot black
the topic has 2 paths
1 op is correct andvinput is 112 and that is resolved: conductor is 1.25 x 112 , cb = 125 A
2 op is incorrect so we can't proceed until he clarifies
Agreed.
Davebones
Senior Member
- Location
- North Of Tampa Fl
The drive is a Invertek Drive ( Optidrive CP2 Model : ODP-2-64075-3HF4NTN ) I physically haven't seen this drive . This is the information one of our departments sent me . It shows input ratings ( supply current continuous 112.5 amps ) . Output ratings ( output current 110 amps ) .
Davebones
Senior Member
- Location
- North Of Tampa Fl
Data sheet also says it's ( Motor output rating is 75 hp )
Seems like the wrong way round but what do I know......
manual: http://www.invertekdrives.com/clien...82-P2MAN-IN Optidrive P2 User Guide V1.20.pdf
output 110 pg 9
input 116.9 pg 151
CB 160 A pg 151
many drives I looked at had the input I slightly higher than the output
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
Then yes, you must size the conductors for 125% of 112.5. The breaker size is whatever they say it must be per their UL file. Mfrs based here will typically give you a min-max range or at least a maximum, but it all depends on how they submitted it to UL and foreign companies often don't fully understand. Looking at an Invertek manual, that appears to be the case here; only one breaker size listed (125A) and it specifically says that for UL installations, you must use that breaker.
- Location
- Connecticut
- Occupation
- Engineer
The manual I looked at says for a 75HP drive, 125A c/b for NON-UL applications and 150A c/b for UL applications.
his exact PN is in this manual http://forums.mikeholt.com/showthread.php?t=186926&page=4&p=1861741#post1861741
pg 9
| ODP-2-64075-3HF4N |
non UL 160 A CB (or fuse)
UL 150 CB (or fuse
pg 51
- Location
- Connecticut
- Occupation
- Engineer
The more up-to-date manual...(Revision 2.10 instead of Revision 1.20)
says 125A Non-UL and 150A UL.
thanks
see that
input I is reduced to 112.5 also (out remains the same at 110)
125 non UL
150 UL
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