Rick,
Your observations are helpful. I did reverse these two pins 9 and 10 and now
have readings but they are way off, ranging from 328 to 870! Yes, 870. That
indicates the shaft traveled some 540 degrees, verified by eyeball. It would
have been more had I not stopped short of using up all the slack in the loops.
So, it seems that the limit switch in at least one direction did not stop the
motor before it went too far. Now, when I try to reverse direction, I cannot
get very far before the other limit switch actuates, stopping rotation.
Probably going back thru a switch and then hitting the otherI had inspected the
gears on the limit switch actuator and found good gear engagement, nothing
looking funny. I did not check the setscrew on the gear but doubt it is loose.
Given this, has anyone seen the rotor 'coast' by the limit switches and how
does one prevent it or adjust it, if there is an adjustment. Yeah, I know I
can always ensure I stop short of the limit. I assume I will need to somehow
reset the physical calibration of the pot to the limit switch actuator
position. The manual does not give the resistance readings for full CCW or
full CW. It simpl y states the range of readings making me guess. Also, my
control board is the original. Not the one that allows a North centered or
South centered option. The manual is not very specific and led me to believe I
need to see 180 degrees with the rotation in the halfway position.
----- Original Message -----
From: "Rick Craig" <rick. craig @n6nd.com>
To: " al n6ta" < al _n6ta@comcast.net>
Sent: Sunday, December 27, 2009 8:09:14 AM GMT -08:00 US/Canada Pacific
Subject: Re: HDR-300 wiring
Hi Al, it looks like you have two wires swapped going to the pot. Pin 10
should ground one side of the pot, pin 9 is the wiper of the pot, and pin 8
will normally have 5 VDC on it. Your measurements show pin 10 to be the wiper
and pin 9 is probably the grounded side of the pot. So you need to reverse the
wires going to Pins 9 and 10.
Good luck, Rick, N6ND
Well, I replaced the T2X with an old HDR-300 (S/N 40) and it turns the 4 el
Stepp I r fine. But, the digital readout is hosed. As currently wired, I get
no numbers, only three dashes. I climbed to the rotor, pulled the housing off
and confirmed the wiring of the potentiometer. The resistance measurements at
full CCW , half way and full CW are: Pin 8-9: always 1000 Ohms regardless of
position Pins 8-10: CCW : 520, half: 344, CW: 141 Total range is ~380 Pins
9-10: CCW : 480, half: 656, CW: 861 Total range is ~380 The totals always add
to 1000 as expected and the range is about 380 Ohms, near the specified 400
Ohms for the expected travel and overage. What bugs me is that the manual says:
8-10: 1000 9-10: 150-550 8-9: 450-850 I have checked three different
revisions of the manual: the oldest that I have, a newer 300 rev and the 300A
rev. The details are the same in terms of the definitions of what pin goes to
what physical terminal on the pot and the Cinch connector. I pulled the lid on
the control box and checked the connector to PCB wiring and it is correct. Any
suggestions or readings from your rotor would be welcomed. Like I said, the
beam will turn and that is an improvement! 73, Al
_______________________________________________
n6nd at arrl dot net
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