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Entry  Fri Nov 17 16:31:11 2017, aaron, Omnistructure, Computers, Acromag wired up AcromagWiringMaps.pdf
    Reply  Fri Nov 17 17:10:53 2017, rana, Omnistructure, Computers, Acromag wired up 
    Reply  Wed Nov 22 00:54:18 2017, johannes, Omnistructure, Computers, Slow DAQ replacement computer progress 
       Reply  Wed Nov 29 21:40:30 2017, johannes, Omnistructure, Computers, Slow DAQ replacement computer progress 
          Reply  Mon Dec 4 22:06:07 2017, johannes, Omnistructure, Computers, Acromag XEND progress 
             Reply  Thu Dec 7 22:24:04 2017, johannes, Omnistructure, Computers, Acromag XEND progress sourcing_input.pngsourcing_to_sourcing_with_common_supply.pngIMG_20171207_193128928.jpg
                Reply  Fri Dec 8 12:06:59 2017, johannes, Omnistructure, Computers, c1auxex2 ready - but need more cables 
Message ID: 13468     Entry time: Thu Dec 7 22:24:04 2017     In reply to: 13463     Reply to this: 13469
Author: johannes 
Type: Omnistructure 
Category: Computers 
Subject: Acromag XEND progress 

 

Quote:
 
  • Need to calibrate the +/- 10V swing of the analog channels via the USB utility, but that requires wiring the channels to the connectors and should probably be done once the unit sits in the rack
  • Need to wire power from the Sorensens into the chassis. There are +/- 5V, +/- 15V and +/- 20V present. The Acromags need only +12V-32V, for which I plan to use the +20V, and an excitation voltage for the binary channels, for which I'm going to wire the +5V. Should do this through the fuse rails on the side.
  • The current slow binary channels are sinking outputs, same as the XT1111 16-channel module we have. The additional 4 binary outputs of the XT1541 are sourcing, and I'm currently not sure if we can use them with the sos driver and whitening vme boards that get their binary control signals from the slow system.
  • Confirm switching of binary channels (haven't used model XT1111 before, but I assume the definitions are identical to XT1121)
  • Setup remaining essential EPICS channels and confirm that dimensions are the same (as in both give the same voltage for the same requested value)
  • Disconnect DIN cables, attach adapter boards + DSUB cables
  • Testing

Getting the chassis ready took a little longer than anticipated, mostly because I had not looked into the channel list myself before and forgot about Lydia's post which mentions that some of the switching controls have to be moved from the fast to the slow DAQ. We would need a total of 5+5+4+8=22 binary outputs. With the existing Acromag units we have 16 sinking outputs and 8 sourcing outputs. I looked through all the Eurocrate modules and confirmed that they all use the same switch topology which has sourcing inputs.

While one can use a pull-down resistor to control a sourcing input with a sourcing output,

pulling down the MAX333A input (datasheet says logic low is <0.8V) requires something like 100 Ohms for the pull down resistor, which would require ~150mA of current PER CHANNEL, which is unreasonable. Instead, I asked Steve to buy a second XT1111 and modified the chassis to accomodate more Acromag units.

I have now finished wiring the chassis (except for 8 remaining bypass controls to the whitening board which need the second XT1111), calibrated all channels in use, confirmed all pin locations via the existing breakout boards and DCC drawings for the eurocrate modules, and today Steve and I added more fuses to the DIN rail power distribution for +20V and +15V.

There was not enough contingent free space in the XEND rack to mount the chassis, so for now I placed it next to it.

c1auxex2 is currently hosting all original physical c1auxex channels (not yet calc records) under their original name with an _XT added at the end to avoid duplicate channel names. c1auxex is still in control of ETMX. All EPICS channels hosted by c1auxex2 are in dimensions of Volts. The plan for tomorrow is to take c1auxex off the grid, rename the c1auxex2 hosted channels and transfer ETMX controls to it, provided we can find enough 37pin DSub cables (8). I made 5 adapter boards for the 5 Eurocrate modules that need to talk to the slow DAQ through their backplane connector.

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