knowing Squirrel cage have high inrush current due to low rotor impedence and rotor impedence is equal to
Xrotor + Rrotor and since X = jWL = j 2 pi f L
Rotor impedence is at its max when f reachs the high point and vis versa, and as the (which above I can prove mathmatically)
""Rotor...
guys, .....question ...this might sound very elemetry but, I had to ask
what determines the type of VFD set??(constant torque, constatnt speed, constant power)
is it set by changing the drive parameter ??? or it is determine by the type of load or the motor??
I have a pump and its power cable was cut by the conduit during the installation. what are my options here??? is there any "Kit" out there can patch up power cables ??? I have tried to Google it and nothing shows up, so any ideas ???
guys, is there really a phsical difference in the 50Hz and 60Hz Motor ??? I always though that they are just rated differently, and what I meant by that is since they are made to be used in a country thats either 50 or 60 hz therefore they are factory test and rated at that frequency. thus if...
guys, when using generator as back up power. is it critical to oversize the alternator in the generator to run VFDs??? if so why??? I spoke to an VFD tech, and he mention about over size the generator and its got something to do with the high power source impedance of the generator being 6 to 8...
question.
lets say I have a 5 hp motor , but I really need a 8 hp ... can I just swap out the stator with a bigger one???? ( assuming the two stators are swapatable)
would that cause any problem???
what are some of the common cause for a submiserable centrifugal pump to go over current ???
hydualicly speaking ....
another question .... will a centrifugal pump, pump in the right direction even the impeller is rotating in the wrong direction?? if yes, what are some of the by product of that???
Question!! I got a DC motor that has quit on me ....I meggered it ...
+ to G is 430M ohms
- to G is 2M ohms
+ to - is 350M ohms
doesn't seems right to me, am I doing it wrong ??? is there a difference on testing AC and DC motors??
this is gonna sound really stupid .....but here it goes ..
when we talking about voltage imbalance in a three phases system, I see everybody are refering to the phase to phase voltage imbalance .. but how about phase to ground voltage ??? is there a recommended range of % difference for...
Recently, I have been put on a project which involved with Win911 software, and been having problem with it.
When a alarm occur, the software would call out, but as soon as someone pick up the call ....it would just hang up and going to the next person on the calling list ..
this is kind of...
alright guys .....here is the application ...
sewage pump station with on site generator.
the VFD located inside of a 230V panel,
the oringinal idea was to use the drive as a phase convertor, since the utility only provide us with single phase there...
pump infor .....
10.1 hp, 230V, 60...
I am new at this so please pardon me, if I ask something that might be trival to alot of people ....
I need some clearification on this .....in pump applications... on the name plate aways states what the FLA is for the motor and lets say if on the name plate it says FLA is 25A, I mean what...
Hi people ,
I recently have seen a Culter Hammer VFD been used as a phase convertor get gain 3 phase at an area where only single phase is avaliable. now ....the problem is that when every we run the pump the output frequency would only go up to around 50 hz.. and it gets worst when I try to...
