V
I have posted this issue early in the thread http://www.control.com/thread/1026250190#1244489188. The issue is all the computers, namely R, S & T reboots while lightning struck near by area or the grid trips due to earth fault. The problem could be resolved then by relocating the Mark V earth pits to a diagonally opposite direction. Since then there were no instance of Mark V computers re-booting while grid earth fault occurred or during lightning.
However recently the same phenomenon occurred in one of our machines when the lightning struck near by area. Machine tripped and caused production loss.
Here I am posting to understand the GE philosophy of installing the Mark V panel.
1. Is it required to gland all the field cables entering the Mark V panel? Presently at our site the cable are not glanded.
2. How the panel should be placed on the base frame? Presently the panel is placed on an insulator (rubber sheet).
3. What should be the earthing philosophy? Presently only one earthing connection is existing, going out from the ground bar from the panel to the earth pits.
However recently the same phenomenon occurred in one of our machines when the lightning struck near by area. Machine tripped and caused production loss.
Here I am posting to understand the GE philosophy of installing the Mark V panel.
1. Is it required to gland all the field cables entering the Mark V panel? Presently at our site the cable are not glanded.
2. How the panel should be placed on the base frame? Presently the panel is placed on an insulator (rubber sheet).
3. What should be the earthing philosophy? Presently only one earthing connection is existing, going out from the ground bar from the panel to the earth pits.