|
0 registered members (),
16
guests, and 18
spiders. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
 Exhaust Fan Speed Control
#75529
03/01/07 04:49 PM
|
Joined: Jun 2005
Posts: 821
OP
Member
|
If I had a 3-phase RTU exhaust fan controlled by a 120V contactor coil, what are my options as far as speed control of the motor?
What if the control circuit operated at 24 volts?
And finally, does a motor need to be rated for variable speed for a low, medium, and high speed controlling device?
Thanks in advance.
|
|
|
 Re: Exhaust Fan Speed Control
#75530
03/01/07 05:59 PM
|
Joined: Jul 2004
Posts: 783
Member
|
3 phase? Variable Frequency Drive.
Use the 24 VDC control signal(s) to select various pre-programmed speeds.
I do not know if the VFD can be remote mounted close to the fan or if it has to be mounted inside, close to the load center.
Larry C
|
|
|
|
Re: Exhaust Fan Speed Control
#75531
03/01/07 11:11 PM
|
Joined: Jun 2005
Posts: 821
OP
Member
|
Nevermind my original post. I'm not even sure what I was thinking when I asked if a control circuit could determine the speed of a motor. I was asked today about installing a speed control in a pizza place to control an exhaust fan. Just nevermind. It's all good.
|
|
|
|
|
