Dc crane problem

Thread Starter

docker

Joined Jan 25, 2012
2
got a question,working on a 4 motor (2 sets) dc crane,you run each set and they run perfect,run both sets together and one set has 20 amps on armatures and other set is showing -40 amps,traced out all wiring,seems good and motors passed signature testing,no grounds and no shorted wiring, any thoughts???
 

KJ6EAD

Joined Apr 30, 2011
1,570
You're talking about a dual vending crane for toys, candies and such?

This sounds like a power supply problem. Either there is a shared supply that's incapable of supplying enough current or separate supplies that are bused togther and one is faulty.
 

Thread Starter

docker

Joined Jan 25, 2012
2
its a 250 ton hot metal crane,both pairs are electrically isolated from each other,(except for the feed) and gearboxes are connected so when 1 pair runs, the whle drive train runs, so pretty sure not mechanical
 
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