ICD_Nasmyth

Nasmyth wheel

Control of the position of the wheel, including motor, tachometer, encoder and limit switches. This 4-element device consists of a Flat Retro-Reflecting mirror, a Free Hole and 2 positions for dedicated Alignment Tools (2 light beacons, half-masks).

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Control of the 2 Image Beacon Light Sources in one of the dedicated Alignment Tools

The control is deployed on the Altitude LCU.
The device is connected to the Terminal Block Z3.

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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 Nasmyth wheel axis

Set to Retro-Reflecting mirror
Set to free hole
Set 1st Alignment Tool position (Beacon)
Set 2nd Alignment Tool position (Halfmasks)
Chop Nasmyth wheel with a given stroke and frequency

Nasmyth wheel interfaces:

Item	From	Signal	Description
MOTOR: Minimotor DC Brush 3557-024CS 24VDC, 30W Gear 180:1
1	LCU	Motor M+	VME4SA Servo Amplifier Channel #1
2	LCU	Motor M-	VME4SA Servo Amplifier Channel #1
3		Shield MSH
TACHOGENERATOR: Minimotor 4.3 G60 4.3mV / rpm
4	ATS	Tacho T+	VME4SA Servo Amplifier Channel #1
5	ATS	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 = 1000 counts/degree = 3.6"/count
7	LCU	Encoder 5V VCC	MAC4-INC Motion Controller Channel #1
8	LCU	Encoder GND	MAC4-INC Motion Controller Channel #1
10	ATS	Encoder A+	Differential line driver A+ MAC4-INC Motion Controller Channel #1
11	ATS	Encoder A-	Differential line driver A- MAC4-INC Motion Controller Channel #1
13	ATS	Encoder B+	Differential line driver B+ MAC4-INC Motion Controller Channel #1
14	ATS	Encoder B-	Differential line driver B- MAC4-INC Motion Controller Channel #1
16	ATS	Encoder I+	Differential line driver I+ MAC4-INC Motion Controller Channel #1
17	ATS	Encoder I-	Differential line driver I- MAC4-INC Motion Controller Channel #1
18		Shield
SWITCHES: Micromat KS35A11 24V, 4A max. - Repeatability=0.03 degrees
19	ATS	Reference & Negative Limit (NC)	MAC4-INC Motion Controller Channel #1
20	ATS	Reference & Negative Limit (COM)	MAC4-INC Motion Controller Channel #1
21		Shield
22	ATS	Positive Limit (NC)	MAC4-INC Motion Controller Channel #1
23	ATS	Positive Limit Switch (COM)	MAC4-INC Motion Controller Channel #1
24		Shield
25		PE
26		PE

Nasmyth Beacon light sources interfaces:

E S O O n l y	Item	From	To	Signal	Description
	IMAGE BEACON LIGHT SOURCES:
	100	LCU	ATS	Switch Image beacon light source #1 on/off	contact closed to switch on image beacon light source #1 Digital Output
	101	ATS	LCU	Image beacon light source #1 status	contact closed means light source #1 switched on Digital Input
	102	LCU	ATS	Switch Image beacon light source #2 on/off	contact closed to switch on image beacon light source #2 Digital Output
	103	ATS	LCU	Image beacon light source #2 status	contact closed means light source #2 switched on Digital Input

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