[TowerTalk] SteppIR cable

[Perry - K4PWO]

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 
microcontroller.

73 de Perry - K4PWO

----- Original Message ----- 
From: "Ron Todd" <ron at k4wz.com>
To: <towertalk at contesting.com>
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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