at the begining of each session, it will be mandatory to avoid any backlash for the motors :
- for the P4 motor : one can go 2k steps DOWN, then 2k steps UP to go back to -360 000 and use the steps UP without any backlash
- for the P1 motor : one can go 2k steps UP, then 2k steps DOWN to go back to -900 000 and use the steps DOWN without any backlash
today, I used the P1 motor to do some steps DOWN to find back the main resonance at the begining of the session.
| Ronic Chiche wrote: |
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this double motors scheme works good.
if motor P4 is used by increasing value, the FP-cavityPZT signal (pink signal on scope) goes HIGHER
if motor P1 is used by increasing value, the FP-cavityPZT signal (pink signal on scope) goes LOWER
!!! CAREFUL !!!
after each session, it is mandatory to put the motors back to their initial position to avoid FP-cavity misalignment.
on P1 : - 900 000 steps
on P4 : - 360 000 steps
| Ronic Chiche wrote: |
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previously, we have connected motor M4 with an IcePap controller.
see this post : https://elog.lal.in2p3.fr/FPC/THOMX+commissioning/278
due to the backlash behavior of the FP-cavity motors, it is impossible to work in both directions on one motor when the FP-cavity is locked.
so, we decided to use also the motor M1 to work in the other direction.
then, normally M1 will work in one direction and M4 in the other direction.
motor M1 (or P1Z) which was on the axis 9 on the ISP controller has been assigned to OC/OP/OCH.01-MOT.06
motor M4 (or P4Z) which was on the axis 12 on the ISP controller has been assigned to OC/OP/OCH.01-MOT.03
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