VFD Settings (TECO FM50-202)

[Patrice Lemée]

Here are the settings on mine for now. I know some here use this particular model, like nathan. Do these look ok? Anything I should change?

F_ Function Description My Setting

2 Decel. Time 1
7 Frequency Lower Limit 5Hz
10 Start / Stop Control 1:Terminal (TM2)
11 Frequency Control (pot) 1:Terminal
13 Torque compensation gain 5%
14 Stop Method 0:Controlled deceleration stop
15 DC Braking time 0 - 25.5s (0.5s)
16 Braking Start Frequency 1 - 10HZ (1.5HZ)
17 DC Braking Level 8%
19 Multi-Function Input Terminal 1 (SP1) 3:Emergency Stop
23 Momentary Power Loss 1: Disabled

Also, I am not sure of the difference between deceleration and brake time?

Thanks.

Pad

 

[silver_pilate]

You may want to look into setting the upper frequency limit to match your motor's peak hp output. That's what was suggested to me by Rob, and it makes sense. Also, the upper frequency available to you (220hz I believe) will be lightening fast. At 60 hz, I'm still running close to my Grizzly's top speed and have all the torque/power available.

Also, if you find that you're tripping the VFD upon turning the motor off, you'll need to increase your decel time.

--nathan

 

[Patrice Lemée]

Nathan, the upper limit is set to 60Hz. Isn't that my motor's peak HP? The motors are 1725 rpm by the way.

The VFD hasn't tripped yet on decel. Hopefully it won't cause I like the fast braking feature.

Thanks.

Pad

 

[silver_pilate]

No problem. I have mine set on 60 Hz as well. That is a typical peak power frequency for these motors. As long as you're not tripping the VFD, you should be fine. I lowered my deceleration speed a bit too much in playing with the settings and had to turn it back up to keep it from tripping. Also, you'll find that at very low speeds with the torque compensation turned up, you'll have a jerky ride. 5% should be fine, though, and I rarely go slow enough for it to matter.

Enjoy the wonder that is variable speed control!!

--nathan

 

[pso]

With the VFD output at 60 Hz, the motor will be running at 100% of it's rated rpm, 1725 rpm in Pad's case. If you set the upper frequency limit to 120Hz, then it will be possible to make the VFD output frequency go all the way up to 120 Hz. At this output frequency, your motor will be spinning at 200% of it's rated rpm. Unless you know your motor can run at over 100% rated rpm, it is probably best to keep the upper frequency limit at the motor rated rpm. I think this is one of those features that every manufacturer has because one of them started offering it but few real customers really use it.

Phil