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Entry  Fri Mar 19 19:15:13 2021, Jon, Update, CDS, c1auxey assembly 
    Reply  Thu Mar 25 12:11:53 2021, Yehonathan, Update, CDS, c1auxey assembly 20210325_115500_HDR.jpg20210325_123033.jpg
       Reply  Thu Mar 25 14:16:33 2021, gautam, Update, CDS, c1auxey assembly 
       Reply  Tue Mar 30 17:27:04 2021, Yehonathan, Update, CDS, c1auxey assembly 
          Reply  Wed Aug 25 11:48:48 2021, Yehonathan, Update, CDS, c1auxey assembly 
             Reply  Mon Sep 13 14:32:25 2021, Yehonathan, Update, CDS, c1auxey assembly ETMX_OSEMS_Noise.png
                Reply  Wed Sep 15 11:27:50 2021, Yehonathan, Update, CDS, c1auxey assembly c1auxex_Grounding_OSEM_comparison1.pdfc1auxex_Grounding_OSEM_comparison2.pdf
       Reply  Thu Apr 15 17:24:08 2021, Jon, Update, CDS, Updated c1auxey wiring plan C1AUXEY_Chassis_Feedthroughs_-_By_Connector.pdf
          Reply  Mon Apr 19 21:54:55 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan 
             Reply  Wed Apr 28 18:56:57 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan 
                Reply  Thu Apr 29 16:35:51 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan 
                   Reply  Thu Apr 29 19:55:45 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan 
                      Reply  Fri Apr 30 19:18:51 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan 
                         Reply  Mon May 3 20:36:46 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan 
                            Reply  Sun May 23 18:28:54 2021, Jon, Update, CDS, Opto-isolator for c1auxey 
                               Reply  Fri May 28 10:54:59 2021, Jon, Update, CDS, Opto-isolator for c1auxey optoisolator.jpeg
                                  Reply  Thu Jun 3 17:15:17 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_Isolator_NPN_Input.pngOptical_Isolator_NPN_Output.png
                                     Reply  Thu Jun 3 22:08:00 2021, Koji, Update, CDS, Opto-isolator for c1auxey 
                                        Reply  Fri Jun 4 14:49:23 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                           Reply  Fri Jun 4 17:46:25 2021, unYehonathan, Update, CDS, Opto-isolator for c1auxey 20210604_173420.jpg
                                              Reply  Sun Jun 6 16:33:47 2021, Jon, Update, CDS, BI channels on c1auxey 
                                                 Reply  Mon Jun 7 13:14:20 2021, Yehonathan, Update, CDS, BI channels on c1auxey 
                                                    Reply  Tue Jun 8 11:54:39 2021, Yehonathan, Update, CDS, BI channels on c1auxey 
                                           Reply  Sun Jun 6 03:02:14 2021, Koji, Update, CDS, Opto-isolator for c1auxey 
                                              Reply  Sun Jun 6 12:15:16 2021, Jon, Update, CDS, Opto-isolator for c1auxey 
                                              Reply  Sun Jun 6 15:59:51 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                                 Reply  Mon Jun 14 15:31:30 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                                    Reply  Tue Jun 15 21:48:55 2021, Koji, Update, CDS, Opto-isolator for c1auxey Acromag_RTS_BI_config.jpg
                                                       Reply  Wed Jun 16 17:24:29 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                                          Reply  Wed Jun 16 20:32:39 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey 
                                                             Reply  Fri Jul 9 18:35:32 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey 
                                                                Reply  Mon Jul 12 18:06:25 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey 
                                                                   Reply  Wed Jul 28 12:47:52 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey SUS-ETMY_SparePDMon0_NoRef.pngSUS-ETMY_SparePDMon0_Ref_WithGND.pngDifferentialOutputTest.png
                                                                      Reply  Wed Aug 11 12:06:40 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey SUS-ETMY_SparePDMon0_2.png
Message ID: 16199     Entry time: Mon Jun 14 15:31:30 2021     In reply to: 16187     Reply to this: 16203
Author: Yehonathan 
Type: Update 
Category: CDS 
Subject: Opto-isolator for c1auxey 

I checked the BI situation on the HAM-A coil driver. It seems like these are sinking BIs and indeed need to be isolated from the Acromag unit GND to avoid contamination.

The BIs will have to be isolated on a different isolator. Now, the wires coming from the field (red) are connected to the second isolator's input and the outputs are connected to the Acromag BI module and the Acromag's RTN.

I updated the wiring diagram (attached) and the wiring spreadsheet.

In the diagram, you can notice that the BI isolator (the right one) is powered by the Acromag's +15V and switched when the coil driver's GND is supplied. I am not sure if it makes sense or not. In this configuration, there is a path between the coil driver's GND and the Acromag's GND but its resistance is at least 10KOhm. The extra careful option is to power the isolator by the coil driver's +V but there is no +V on any of the connectors going out of the coil driver.

I installed an additional isolator on the DIN rail and wired the remaining BOs (C1:SUS-ETMY_SD_ENABLE, C1:SUS-ETMY_LR_ENABLE) through it to the DB9F-4 feedthrough. I also added DB9F-3 for incoming wires from the RTS and made the required connection from it to DB9F-4.

I tested the new isolated BOs using the Windows machine (after stopping Modbus). As before, I measure the resistance between pin 5 (coil driver GND) and the channel under test. When I turn on the BO I see the resistance drops from inf to 166ohm and back to inf when I turn it off. Both channels passed the test.

 

Attachment 1: Optical_isolator_Wiring.pdf  230 kB  Uploaded Mon Jun 14 17:31:41 2021  | Hide | Hide all
Optical_isolator_Wiring.pdf
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