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General Mach Discussion / Encoder pull up resistors
« on: February 17, 2009, 02:40:49 PM »
Hi,
Does anyone have experience of using pull up resistors on encoders?
The story is:
While "playing" with a G340 and a servo (heds 5500 encoder) I noticed I had erratic movement
with cables 12 foot long.
I swapped each cable out and found that it was the 5volt feed line,and if I shortened it to below
4foot it would work fine,even though the main power and a-b channel (screened) were 12ft long.
I then put a seperate psu to feed the encoder,this made no differance same problem.
I remember reading somewhere about putting pullup resistors on long a-b cablles, would this work on
the 5v line? if so what sort of value and series or parallel? which end encoder or drive?
Cheers
Does anyone have experience of using pull up resistors on encoders?
The story is:
While "playing" with a G340 and a servo (heds 5500 encoder) I noticed I had erratic movement
with cables 12 foot long.
I swapped each cable out and found that it was the 5volt feed line,and if I shortened it to below
4foot it would work fine,even though the main power and a-b channel (screened) were 12ft long.
I then put a seperate psu to feed the encoder,this made no differance same problem.
I remember reading somewhere about putting pullup resistors on long a-b cablles, would this work on
the 5v line? if so what sort of value and series or parallel? which end encoder or drive?
Cheers