The longer cable, due to its resistance, would act as a current limiter
preventing power supply fold-back.
Have you confirmed that the power supply is really shutting down? The
description almost sounds like a "slow" stepper problem. Can't say for sure
as I don't know what is in the controller "code" but this sounds a lot like
a PID loop failure that causes the controller to fault. You may have a
binding #4 motor that will operate alone but when any other motor is in
play, and motor 4 can't get the full share of current, its slow response
causes the fault.
Just an idea as I saw something like this from a company that "outsourced"
its controllers and wasn't even aware of the "features" programmed into the
73 de Perry - K4PWO
----- Original Message -----
From: "Ron Todd" <firstname.lastname@example.org>
Sent: Sunday, June 10, 2007 8:06 PM
Subject: [TowerTalk] SteppIR cable
> Several mentions were made that it was related to the 500 feet of control
> cable, but SteppIR's engineers say the longer cable would actually help
> reduce the load, so cable length has been ruled out.
> I dont know how the longer cable would help.
> I would look at the size of the cable. SteppIR makes two size, one for
> short runs and one for long runs.
> GL K4WZ Ron
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