I recently found 2 loose bolts on a slew-ring, both were cracked! We were not allowed by the manufacturer to remove the other 157 bolts because of the load on it.
A Krautkamer USN 50L was used to perform test on the bolts in place.
(bolts are 12.9 - 30mm 11" long)
Question:
How reliable is...
Looking for info on a grade 8 ( 1" shaft dia. ) with the letters "BY" on center of head. What's the BY stand for?
Also this bolt was used instead of a required grade 10.9
( 27mm / 1" 1/8 shaft dia. ) on a critical structure.
What magnitude of danger if any would this pose ?
Thanks
I have been searching the web for some "basic" guide lines to follow on doing a insulation resistance test on motors.
I seem to be getting inconsistent procedures on test voltage range and in particularly "lead placement".
For insistence:
I have read test voltage range <1000v = 500vdc range...
I'm thinking of buying a All-Test Pro 31 instead of a quality megger.
Does anyone have any first-hand experience with one.
Here's a link with some info;
http://www.reliabilitydirect.com/motormonitor/pdf/AT31.pdf
Crane equipped with 2 swing motors;
WRIM with eddy current brake; 3 phase, 480v, Y connected
One motor is wired with stator going to rotor and rotor going to stator.
Also there are no internal motor wires going to bridged post / star point.(6 wires) other motor has 9
How, and why is this motor...
When looking in the motor terminal box ( WRIM ) is it correct to assume that the group of wires with the ground is the stator. And can the rotor be wired wye or delta.
THANKS
