After I have changed the VFD from Mitsubishi F700, I requested that they change the electric Motor because the motor is very old...and the Yaskawa VFD-1000 detected leakage to Ground.
Lo and behold...they brought another Brake Motor 18.5 kw WEG motor... this motor does not have fan on it at the Brake end....
So, I consider it an Inverter Duty Motor...
So, firstly, I hook it up directly to 3-phase, 415v Supply, through an MCCB only, and powered up....it's brake released and it run smooth for 10 minutes...it was pulling 20.2 amps on no-load...also, its body temperature was cool .... but the brake end of its enclosure was hot...
My Questions:
*1). This motor does not have fan on it's shaft...is it how Inverter Duty Motor are designed...?
*2). The brake is rated 400vac.... but my voltage is 415vac...can this be responsible for the temperature on its brake end of the motor housing...?
I feel 415v should be within the brake tolerance..
*3). Is this the behavior of all Inverter Duty Motor...?
*4). How come it does not have cooling fan..?
*5). Do I still need to connect the Dynamic brake Resistor....since this motor has a perfect brake on it...?
*6). Both VFDs are in my possession (Yaskawa A1000 and Mitsubishi F700, so with this Inverter Duty WEG motor... which do you advise I use for this new brake motor...?
Remember...it is a HOIST application...used in SHIP for raising and lowering it's heavy anchor...
I need your advice and guidance...as I will be connecting the VFD to the motor by tomorrow...