ICD_Coude

Coudé Beam Switching Device

Control of the selection of the different elements that can be inserted in the beam in front of the Coudé sensor. It consists of 5 elements, namely a Mirror reflecting the beam to FAS only, a Beam Splitter sending the beam to both FAS and FSS, a Free Hole to FSS only, a Light Stop that prevents the beam to reach neither FAS nor FSS and a FSS pupil viewer which enables to view the image of the pupil on the FSS APD using the FAS.

The control is deployed on the Azimuth LCU.
The device is connected to the Terminal Block Z10.

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The motor control is a pure SW interface: the target position and velocity are passed to the Motion Controller via the VME bus. The motor control software is provided by ESO.
The functionalities to be provided are:

Set absolute position of Coudé Beam Switching Device axis:

Set Light Stop
Set FAS only
Set FAS+FSS Beam Splitter
Set FSS only (Free Hole)
Set FSS pupil viewer

Coudé Beam Switching Device interfaces:

The connection layout and pin assignment of Z10 is given in Annex 1 VLT-DWG-ESO-15154-1770

Item	From	To	Signal	Description
MOTOR: Minimotor DC Brush 2233-024S 24VDC, 2.53W Gear 29.6:1
1	LCU	ATS	Motor M+	VME4SA Servo Amplifier Channel #1
2	LCU	ATS	Motor M-	VME4SA Servo Amplifier Channel #1
3			Shield MSH
TACHOGENERATOR: Minimotor 1.5 G 1.5mV / rpm
4	ATS	LCU	Tacho T+	VME4SA Servo Amplifier Channel #1
5	ATS	LCU	Tacho T-	VME4SA Servo Amplifier Channel #1
6			Shield TSH
ENCODER: Minimotor Optical HP HEDL 5540-500 5 VDC - 500 lines/turn - Resolution in Quadrature = 59200 counts/mm = 59.2 counts/µm
7	LCU	ATS	Encoder 5V VCC	MAC4-INC Motion Controller Channel #1
8	LCU	ATS	Encoder GND	MAC4-INC Motion Controller Channel #1
7	ATS	LCU	Encoder A+	Differential line driver A+ MAC4-INC Motion Controller Channel #1
8	ATS	LCU	Encoder A-	Differential line driver A- MAC4-INC Motion Controller Channel #1
13	ATS	LCU	Encoder B+	Differential line driver B+ MAC4-INC Motion Controller Channel #1
14	ATS	LCU	Encoder B-	Differential line driver B- MAC4-INC Motion Controller Channel #1
16	ATS	LCU	Encoder I+	Differential line driver I+ MAC4-INC Motion Controller Channel #1
17	ATS	LCU	Encoder I-	Differential line driver I- MAC4-INC Motion Controller Channel #1
18			Shield
SWITCHES: Micromat KS35A11 24V, 4A max. - Repeatability=0.03mm
19	ATS	LCU	Reference & Negative Limit(NC)	MAC4-INC Motion Controller Channel #1
20	ATS	LCU	Reference & Negative Limti (COM)	MAC4-INC Motion Controller Channel #1
21			Shield
22	ATS	LCU	Positive Limit (NC)	MAC4-INC Motion Controller Channel #1
23	ATS	LCU	Positive Limit (COM)	MAC4-INC Motion Controller Channel #1
24			Shield
25			Global Shield

Last modified: Wed Jan 150 10:20:44 MET 2003