Thank u all
I'd like to make some points clear:
1) The 2 motors must work together as both are rotating one concrete mixer, so I cannot delay one for few seconds.
2) the star delta circuit was made by the manufacturer of the plant and it is working since 3 years ago
and as you know the star...
situation is as following :
I have one generator wich supports all the plant loads 24 hours.
one of the loads is a concrete mixer which is driven using 2 motors ,37KW each.
These 2 motors are started using one star delta circuit(3 contactors) and it is made by the manufacturer.
the plant is...
Hi Shady
Concerning meggaring the cable , I read this in some thread here as it may be danger to the other connected equipment to inject the cable with voltage , anyway it is just a precaution.
I believe that the current transformer is for step up/down current and not for protection .
please...
Thank you all for ur replies
my supply is from a site generator,
the motor which is 75 kw moves a concrete (ready mix) mixer ,this is my load .
concerning the star delta why it is fitted in the first place -it is manufactured by siemens .
when the short circuit happened and the contactors were...
I alwasys have wondered, what would happen if I modified the star delta circuit of a 75 KW motor to a direct on line circuit ?
Is there any risk on the motor winding??
I'd like to thank u sir for assisting me .
I have a motor 75 kw and the Fuse is 160A
Another thing I id like to ask about .
this motor is starting by a star delta contactors , I cancelled the star circuit and let the motor works direct on line and it is working now for 4 days without a problem...
I have a problem on site , which is lasting for 4 days untill now and I did not figure out the cause or the problem .
the Situation is I had a short circuit and the main fuse broke down .
I checked Visual inspection for the contactor , overload , motor winding , cable and connections and i did...
