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UK Railways >> UK Diesel Locomotives >> English Electric diesel traction motor amps surging.

Message started by aussiesteve on 11th Dec, 2017 at 6:00am

Title: English Electric diesel traction motor amps surging.
Post by aussiesteve on 11th Dec, 2017 at 6:00am
I have a technical question about English Electric 12 CSVT Mk 2 and Mk 3 units.
My only footplate exposure to EEs was during my three year exile in Tasmania.
Yes, these were built in Australia not the UK.
But, I am attempting to discover any comparison with UK built units.
These units, dubbed the Z and ZA class regularly surged in traction motor amps when under full load.
I was told that this was normal.
I am wondering if this surging was due to the load regulator associated with the governor.
These units were air throttle and with Davies Metcalfe M9A brake system.
Alco and EMD motive power that I was familiar with here in NSW would only surge in motor amps due to wheel-slip etc.
I did enjoy the Tassie EEs once becoming familiar with their idiosyncrasies.
Though, the metal head control jumper cable was a bit of a pain.
Much the same as the trio of control jumper cables necessary on our NSWR 46 class Metro Vickers units.
Hopefully, somebody can enlighten me as to the reason for the traction motor amp surging.

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