I was wondering if there is a national, or international standard for press manufacturers tolerance specification. An example would be deflection testing for the ram and bed or flatness. At 196 inches in length you would be allowed so many thou per foot. Like DIN standard I am wondering if one...
Coil voltage is good, do you think that it may be 'lazy coil' trying to pull in the contactor and severely arching and chattering the contacts and melting them??
looking at these contactors more carefully, the only damage seems to be localised around the 3 phases, not the coil as previously...
Thanks for all your replies.
I went back into the 'box' of contactors and started pulling some apart.
The coil seems to be ok.
The contacts themselves are burned and on some, the armature is swollen which prevents the contact to open and close freely.
Seems to be a lot of heat generating...
Here is a wierd one.
I have a AB contact relay with a 5.4 tp 27 A overload driving a 15HP motor drawing 9-10amps in both directions.
Overload set at 17A motor FLA 23.
Coil voltage is 120VAC
23A 15hp 3ph contactor
This contactor works fine for 2 mos and then the coil burns up and contactor is...
