Erratic behavior from VFD

here is the motor plate.
 

Attachments

  • IMG_20210501_203405451.jpg
    IMG_20210501_203405451.jpg
    2.4 MB · Views: 9
  • IMG_20210501_203421864.jpg
    IMG_20210501_203421864.jpg
    3.3 MB · Views: 8
Suggestions below as to motor parameters to check. Make sure the motor is wired for 220V.
00-00 SLV mode = 1

Group 02 parameters should be:
02-01 Motor rated current = 4.0A
02-03 Motor rated speed = 1150
02-04 Motor rated voltage = 220V
02-05 Motor rated power = 0.75 kW
02-06 Motor rated frequency = 60 Hz

set 02-07 to 1 and run auto tuning

I would be conservative with this motor given the age and the insulation rating, so 60 or 70 Hz maximum and a carrier frequency in the 6-8 kHz range. Usable speed range is probably 20-60 Hz.
 
mksj said:
Suggestions below as to motor parameters to check. Make sure the motor is wired for 220V.
00-00 SLV mode = 1

Group 02 parameters should be:
02-01 Motor rated current = 4.0A
02-03 Motor rated speed = 1150
02-04 Motor rated voltage = 220V
02-05 Motor rated power = 0.75 kW
02-06 Motor rated frequency = 60 Hz

set 02-07 to 1 and run auto tuning

I would be conservative with this motor given the age and the insulation rating, so 60 or 70 Hz maximum and a carrier frequency in the 6-8 kHz range. Usable speed range is probably 20-60 Hz.
Click to expand...

I went through the 54 functions today and recorded them. Almost everything is default values. External command source is correct for using the drum switch. Frequency settings are for 60hz, voltage is set for 220V. Didn't see anything listed as "SLV".

My motor settings show:
motor current = 3.4A, motor voltage = 220V, motor power= 0.8kw, motor frequency= 60hz
The motor speed is a little confusing to me, my setting is 17.0 The manual has this value range notation: "0-120 (* 100 rpm) * 8"
If I did the calculation correctly my motor speed rivals a jet engine, obviously I am not doing it correctly. I don't remember putting these values in but that was 15 years ago.

One interesting thing that I did find is the last function is "Latest 3 fault records", the display shows: "LUC". I didn't find that code listed in the manual. Tomorrow I will look at that function again and see if I can find more info.

I agree on the usable speed range, my experience has been that 20hz is the lowest, I usually work with 40-60hz or change the drive belt position.
 
That is a strange way to specify the motor speed. Every VFD I have commissioned had the actual speed as the value, or the number of poles, not some weird formula. The way I read what you wrote, your value should be 12*8 =96, ie (1200/100 * 8) = 96. The (*100) notation means the number you use in the formula times 100 is your motor speed.

Can you post a picture of that section of the manual? I would like to see if there is something else we are missing.
 
That makes a lot more sense. You should change F47 to 12. That is enough of a difference to cause the problem you are seeing.
 
Did not realize you were dealing with the Teco FM50 which was discontinued quite a few years ago, and per above F47 is 12. I would seriously look into upgrading your VFD, the newer models have sensorless vector control and auto-tuning, as well as many other adjustment parameters that will do a better job of matching the VF to the motor. You are currently running V/Hz, and takes a bit more tweaking if the motor is stalling out when starting, although I think there may be other issues going on. The capacitors also have a finite lifespan.
 
For what it's worth, I changed changed F47 to 12, no change the motor's behavior.
 
You must log in or register to reply here.
Back
Top