#garfield Logs

Nov 03 2020

08:41 AM rue_mohr: yea but thats it, he makes them more complex
08:47 AM rue_mohr: the screen could have been just hooked up to the bus
08:47 AM rue_mohr: and the register there could have used a 374 instead of two 174
08:47 AM Tom_L: pullies on Thursday
12:12 PM Tom_L: https://www.alibaba.com/product-detail/310V-1-2kw-electric-motor-1200w_60737993181.html?spm=a2700.7724857.videoBannerStyleB_top.9.32c7751dTHUvzS
12:35 PM rue_mohr: oh they have a switch on that one for 4-20mA
12:37 PM Tom_L: i bet that's where he get them
12:37 PM rue_mohr: probably
12:37 PM rue_mohr: but I think yours has more signals on it
12:38 PM rue_mohr: none of what I have seen says if the control signals are isolated, I dont think they are
12:38 PM Tom_L: same company, different options
12:39 PM rue_mohr: if you meter from V- to the case, is it 0 ohms?
12:40 PM Tom_L: i'll check
12:40 PM rue_mohr: and I thought yours is 120vac in?
12:40 PM Tom_L: yes it is
12:41 PM Tom_L: it's a separate supply mounted to the bottom
12:41 PM rue_mohr: oh outputs 24V?
12:41 PM Tom_L: the leads go to the other board where the filter caps would normally be
12:41 PM Tom_L: i dunno
12:41 PM rue_mohr: heh, I'll wait for the images!
12:41 PM Tom_L: the motor outputs are high V
12:42 PM Tom_L: 300 ish
12:42 PM Tom_L: i did measure from the logic inputs to gnd and they were all 5v
12:42 PM rue_mohr: yea, you put 120VAC into the controller, and it does its thing and outputs to the motor, right
12:42 PM Tom_L: active low
12:42 PM rue_mohr: yup, active low
12:43 PM rue_mohr: on $$$ vfd, they always optically isolate the control signals
12:43 PM rue_mohr: but they always say it
12:43 PM Tom_L: my mesa board has optos on all the control that goes to it anyway
12:43 PM rue_mohr: I would expect them to on that, but I dont see it said
12:44 PM rue_mohr: where does your 0-10V come from tho?
12:44 PM Tom_L: the mesa board
12:44 PM Tom_L: part of that group of pins
12:44 PM Tom_L: he designed it for this
12:44 PM rue_mohr: ok, do you know if its isolated too?
12:44 PM rue_mohr: its hard to isolate analog
12:45 PM Tom_L: i'm not sure and the doc just says analog out
12:45 PM Tom_L: an- an+ and out
12:45 PM Tom_L: it's a differential of 10v? and can float if needed
12:45 PM rue_mohr: huh
12:46 PM rue_mohr: ah, floating means its isolated
12:46 PM Tom_L: i'll post the manual
12:46 PM rue_mohr: what if I want the automatic :)
12:47 PM Tom_L: he sent me one once
12:47 PM Tom_L: schematic for his board that is
12:49 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/7i47sman.pdf
12:49 PM Tom_L: pdf P12
12:49 PM Tom_L: yes he says it's isolated
12:50 PM rue_mohr: The analog output is a
12:50 PM rue_mohr: isolated potentiometer replacement type device
12:50 PM rue_mohr: isolated,
12:50 PM rue_mohr: I'd normally see it isolated on the vfd end, doesn't matter tho
12:51 PM rue_mohr: oh, they use pwm and isolate it at that level
12:51 PM Tom_L: yeah
12:52 PM Tom_L: ok i think i got the config picked over for a starting point
01:59 PM polprog: https://polprog.net/rozne1/ircjunk/various/siemens_d1011.pdf
01:59 PM polprog: page 29
01:59 PM polprog: check out the cool digitally controller ramp gen..
01:59 PM polprog: ;)
02:00 PM polprog: i scanned the manual cause i gave that scope away to a friend
04:09 PM rue_shop1: you already have a scope then?
04:59 PM MiniBat is now known as TermMoon
05:00 PM TermMoon: rue_mohr: still in class?
05:01 PM Tom_L: moon of many faces
05:01 PM TermMoon: yes
05:02 PM rue_mohr: I'm done
05:03 PM rue_mohr: there is a note here about something I'm supposed to do
05:03 PM TermMoon: ?
05:03 PM Tom_L: you'd better do it then
05:03 PM rue_mohr: <rue_bed> rue_mohr, BUY CLIPBOARDS!!!
05:04 PM Tom_L: funny, they recomend an external brake resistor but size wise at least the external one is about half the size of the internal one
05:04 PM TermMoon: buy me chocolate???
05:04 PM Tom_L: i can't get in far enough to measure the internal one
05:12 PM rue_mohr: TermMoon, what you gonna pay me if I'm paying you chocolate
05:34 PM aandrew: Tom_L: perhaps thermal characteristics
05:34 PM aandrew: rue_mohr: I think you have to buy clipboards
05:51 PM TermMoon: rue_mohr: HA
06:07 PM TermMoon: where you go?
06:11 PM TermMoon: oh off to buy clipboads DUH on me XD
06:22 PM rue_mohr: got 7
07:22 PM Tom_L: most of the config rewritten
07:49 PM rue_mohr: ?
07:49 PM rue_mohr: tidy up?
07:52 PM TermMoon: hey rue, you got isa socket I can sweat? or should I buy some?
07:57 PM Tom_L: had a bunch of 'sherline specific' code i had to remove and rearrange
08:44 PM TermMoon: who likes MASH?
08:52 PM Tom_L: 4077?
08:52 PM Tom_L: used to watch that all the time
09:41 PM TermMoon: yeah! :)
09:41 PM TermMoon: Gnight
10:10 PM rue_mohr: THAT WAS STRANGE
10:10 PM rue_mohr: I just did one of the required tests on the lab work for the course
10:11 PM rue_mohr: it was all just looking up answers we already did
10:11 PM rue_mohr: nothing to figure ut
11:26 PM rue_mohr: empty feeling day