VFD 400VAC adjustment
VFD 400VAC adjustment
(OP)
Hello, I got a burn out motor winding due to mis-configuration of VFD setting. Yet, i could never find motor data setting on VFD for Voltage rating, however only percent voltage output (VFD) is available.
So i tried to play along this voltage output as well as frequency adjustment to coincide with the motor specs. I am not sure if this setting is correct with VFD at V/F mode controlled by pot, Please i need your comments.
VFD specs: 440V/60HZ, 3 Phase, Model: LG-iG5A
Motor specs: 400V/50HZ, 3 Phase.
So i tried to play along this voltage output as well as frequency adjustment to coincide with the motor specs. I am not sure if this setting is correct with VFD at V/F mode controlled by pot, Please i need your comments.
VFD specs: 440V/60HZ, 3 Phase, Model: LG-iG5A
Motor specs: 400V/50HZ, 3 Phase.
"..the more, the merrier" Genghis Khan





RE: VFD 400VAC adjustment
I wonder if that's really the cause of the motor failure. Is the motor inverter duty? Have you set the Motor Rated Current (page 5-12)? Overload settings (Chapter 10)?
RE: VFD 400VAC adjustment
But i am not sure this make sense for vfd in v/f mode controlled by pot. Anyway, i had measured the vfd output, 400v/50hz for pot full range unlike before as 440v/60hz.
After the motor winding was damage. I investigated the cause first checking vfd settings, as i found had loaded with default value settings. Only later i verified that the v & f were set to 440v, 60 hz, respectively. So i assume, this causes the problem where the motor recieves over voltage 440v and over frequency to 60hz (about more than 20% rated freq). Rated current is fine but overload current time was set to 60 sec.
I am not sure this motor is inverter duty..but i saw most applications of such motor replacement ( different maker) comes in pair with vfd.
By the way, motor application is for exhaust duct fan.
"..the more, the merrier" Genghis Khan
RE: VFD 400VAC adjustment
When you spun the fan 6/5ths faster than desired you asked for about 50% more power from the motor.
Keith Cress
kcress - http://www.flaminsystems.com
RE: VFD 400VAC adjustment
But the default setting should have been ok. 440V 60 Hz sets up a V/Hz ratio of 7.33:1. The motor's design V/Hz ratio, 400/50, is 8:1. As long as you are within 10% the motor should be fine. But if you began manually trying to mess with it, you may have inadvertently created a detrimental situation.
Hard to tell though, you didn't provide enough information.
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: VFD 400VAC adjustment
RE: VFD 400VAC adjustment
Jraef, line voltage is 440V.
"..the more, the merrier" Genghis Khan