In DC Drives, Armature fuses blown out after tacho changeover
Posted 06 September 2005 - 02:35 PM
Now the problem is that when we changeover the tacho from tacho-1 to tacho-2 all 10 motors armature fuse blown out.
But when we changeover the tacho from tacho-2 to tacho-1 Drives working fine and none of the fuse blown out.
Also Drives working fine on either tacho selection, problem comes only during tacho changeover..
Note: Both tacho feedback voltages are almost same.
Can somebody help me . Thanks in advance.
Posted 06 September 2005 - 07:06 PM
Welcome to the forum.
The simple answer is to not switch tachos while the drives are running.
It sounds to me as though there is a problem with the switching which is causing the drives to suddenly supply full output voltage to the armatures. Perhaps there is an opne circuit during switching one way, or there is a "negative" spike. Very hard to say from here.
Perhaps someone else has experienced this before.
I assume that this used to work OK??
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