montgomeryjack
Electrical
- May 18, 2007
- 4
Hi all
I have read a couple of threads related to this topic, but I can't put my finger on this specific problem -
We work with a diesel/electric drive system, diesel engine or electric standby motor driving a compressor via a clutch/belt drive system. We are experiencing electrical pitting on the main crankshaft bearing in the engine whilst operating in electric drive, i.e. crankshaft stationary.
Material of main bearing is aluminum alloy with tin and silicone, and its melting point is 230 deg C.Aluminium alloy layer is 0.3mm in main bearing. We are deducing from bearing analysis the pitting is electric static or electromagnetic in origin.
This issue is only occurring when operating on electric standby on baldy grounded mains - or on an isolated system on a ship. This means that the "GND" of our entire unit is now floating which is exaggerating the problem
Before you ask - Yes we have examined the belt static conductivity spec, but it only seems to be part of the problem
Any suggestions?
I have read a couple of threads related to this topic, but I can't put my finger on this specific problem -
We work with a diesel/electric drive system, diesel engine or electric standby motor driving a compressor via a clutch/belt drive system. We are experiencing electrical pitting on the main crankshaft bearing in the engine whilst operating in electric drive, i.e. crankshaft stationary.
Material of main bearing is aluminum alloy with tin and silicone, and its melting point is 230 deg C.Aluminium alloy layer is 0.3mm in main bearing. We are deducing from bearing analysis the pitting is electric static or electromagnetic in origin.
This issue is only occurring when operating on electric standby on baldy grounded mains - or on an isolated system on a ship. This means that the "GND" of our entire unit is now floating which is exaggerating the problem
Before you ask - Yes we have examined the belt static conductivity spec, but it only seems to be part of the problem
Any suggestions?