Manual_SwitchBranchline
How to switch the branchline (e.g. from A to B, from A to C...)
Only for beamline staff. This procedure is not inteded for users.
IMPORTANT! Before starting to move check that the value in
http://082f-bcs.blcs.elettra.trieste.it/blcs/CENTRAL/PEM1/HEIDENHAIN_20/ASSEZ?ACTION=GET
082 BCS: PEM1: Optical Encoder:MZ-PEM1 positionCENTRAL PEM1 HEIDENHEIM_20 ASSEZ is different from 0 and the STATUS iS 0 (AND NOT 8).
IF STATUS is 8 and encoder is 0 you need to call Michele Turcinovich and ask to reboot the ENCODER (it is not necessary to restart the bcs).
Or, you can move the chamber into the correct position with small motor steps, watching the Encoder readings on the Heidenhain controller display:
- On the main BCS web page, click on PEM1, then go to "(DSM_21) Dig. stepper motor".
- Note Z axis position and click on "(6MVREL) Z axis relative move".
- Move Z axis step by step. Relative movement -100 motor steps, will move Z by about -0.2 mm (on the Heidenhain encoder display).
From March 2021
A new position for Branch A was found in Feb 2021. The beam flux in the Endstataion A is about 20% higher at PostHorA Z = -20.5 (21.6 enoder reading)| Branch |
PostHorA Z user units (encoder value) |
PreVert Z (mm, encoder) |
| A | -20.492 (21.598) | -1.574 |
| B | 25.985 (-24.879) | -1.574 |
| C | ? (0) | -1.774 |
From January 2021
| Branch |
PostHorA Z user units (encoder value) |
| A | -21.955 (23.062) |
| B | 25.985 (-24.879) |
| C | ? (0) |
Before 2021
| PostHorA Z | PostHorB Z | |
| A | -23 (+23) | -63 (+23) |
| B | +25 (-25) | -15 (-25) |
| C | 0 (0) | -40 (0) |
FROM A TO B
1. POSTHORA. Z. Read. It should be UserUnits=-23 (UPDATE: August2014: found -21more flux but Io more noisy), Encoder +23 (Branchline A)
2. POSTHORB. Z. Read. It should be UserUnits=-63 (BRACH A), Encoder +23 (Branchline A). If OVERWRITE or RESTORE message appears, it is likely you have to select OVERWRITE.
3. POSTHORB. Z. Move UserUnits to -15 (OLD VALUE WAS -18), Encoder -25 (OLD VALUE was -22) (Branchline B).
4. POSTHORA. Z. Read. A message OVERWRITE/RESTORE will appear. Press Overwrite. Now you should read: UserUnits=+25 (Told value was +22), Encoder -25 (OLD VALUE was -22)(Branchline A). If OVERWRITE or RESTORE message appears, it is likely you have to select OVERWRITE.
FROM A TO C:
1. POSTHORA. Z. Read. It should be UserUnits=-23 (UPDATED GEN2011. NOTE: THE OLD VALUE WAS -26), Encoder +23 (Branchline A)
2. POSTHORA. Z. Move User Units to 0 (zero). Enc=0.
Prehor -900 (0.5) A--->4503(-14245) C
Prevert -151(64.406) A--->267.975 (5.966) C (31/08/2016)
FROM C TO A
1. POSTHORA. Z. Read. It should be UserUnits=0 Encoder 0 (Branchline C)
2. POSTHORA. Z. Move User Units to -23 (zero). Enc=+23.
FROM C TO B
1. POSTHORB. Z. Read. It should be UserUnits=-40 Encoder 0 (Branchline C)
2. POSTHORB. Z. Move User Units to -15 (zero). Enc=-25
Before starting to move check that the value in 082 BCS: CENTRAL PEM1 HEIDENHEIM_20 ASSEZ is different from 0 and the STATUS iS 0 (AND NOT 8).
IF STATUS is 8 and encoder is 0 you need to call Michele Turcinovich and ask to reboot the ENCODER (not the bcs).
