[dsg-halla_moller] [New Logentry] TM3 to full nominal current of 3370 A

[Amrit Yegneswaran]

good news
is the resistance of 10 mohms higher than wha t is expected
hove pablo and you checked all the connection points
dont understand much
why is the limit set to 35v
why is it not changeable to a higher value
are you at the power rating os the supply
wdll talk tomorrow

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________________________________
From: dsg-halla_moller <dsg-halla_moller-bounces at jlab.org> on behalf of beng--- via dsg-halla_moller <dsg-halla_moller at jlab.org>
Sent: Monday, September 29, 2025 16:26
To: dsg-halla_moller at jlab.org <dsg-halla_moller at jlab.org>
Subject: [dsg-halla_moller] [New Logentry] TM3 to full nominal current of 3370 A

TM3 to full nominal current of 3370 A<https://logbooks.jlab.org/entry/4458343>

Lognumber 4458343<https://logbooks.jlab.org/entry/4458343>. Submitted by beng<https://logbooks.jlab.org/user/beng> on

Mon, 09/29/2025 - 16:22<https://logbooks.jlab.org/entries?start_date=1759173763&end_date=1759180963&book=DSGLOG&book=MOLLER>

.

Logbooks:
DSGLOG<https://logbooks.jlab.org/book/dsglog> MOLLER<https://logbooks.jlab.org/book/moller>
Entry Makers:
campero, ghoshal, dodge
References:
4458169 - TM3 to 1000A<https://logbooks.jlab.org/entry/4458169>

Pablo and I verifed that all channels of the voltage comparators were wired and worked as expected. Namely that when a + voltage was on the upper channel it tripped the upper and a - votlage on the upper it tripped the lower. Similarly a + voltage on the lower would trip the lower and a - voltage on the lower would trip the upper.

All seven channels (one for each coil) on the VCs were verified good. We found 2 cables that needed to be swapped between +/- connections.

We then adjusted the balance on channels 1, 6, and 7 since those still tripped at 1200 A. After doing so we were able to reach nominal current, albeit briefly. When running at 3370A the voltage is just under the MPS software limit of 35 V so eventually the MPS tripped itself due to an overvoltage fault.

We tried several places to change this limit but couldn't get anything to work, we've already reached out to OCEM for support.

The balance for the remaining 4 channels will be done once this issue is worked around. We also need to set the gain for all channels to lower values as well.

[https://logbooks.jlab.org/files/styles/plentybig/public/2025/09/4458343/3370A.jpg]
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