oc #: 2100 a 015 0083 revision: 4m ass age lectronics and ...2100-ad-015-0083.docx page 9 of 14...

Doc #: 2100-AD-015-0083 Revision: -

4m Cass Cage Electronics and Cable Removal

Author(s): John Donaldson, Miranda Saucedo, Tammie Lavoie

4m Cass Cage Electronics And Cable Removal

2100-AD-015-0083.Docx of 14

Contents Revision History .................................................................................................................. 3

1.0 Purpose ..................................................................................................................... 4

2.0 Applicable To ............................................................................................................ 4

3.0 Scope ........................................................................................................................ 4

4.0 Definitions ................................................................................................................ 4

5.0 Training ..................................................................................................................... 4

6.0 Safety ........................................................................................................................ 5

7.0 Personnel, Equipment and Materials Required ....................................................... 5

8.0 Procedure ................................................................................................................. 5

9.0 Procedure Review................................................................................................... 14

10.0 Records ................................................................................................................... 14

11.0 References .............................................................................................................. 14


2100-AD-015-0083.Docx of 14

Revision History

REV

Date Approved

Sections

Affected

Reason for Change

Remarks and/or Change Details

Name

-- 01/23/18 Initial Release J. Donaldson

T. Lavoie

Approved by:

John Donaldson

Name, ME Title

John Donaldson

Name, EL Maint

SigSci

Name, SciOps

Tammie Lavoie 23 January 2018

Tammie Lavoie, Safety Manager Date


2100-AD-015-0083.Docx of 14

1.0 Purpose The intent of this procedure is to safely remove the Cass cage electrics and cables from the

Mayall 4 Meter Telescope.

2.0 Applicable To This procedure is applicable to the Electronics Maintenance (EM) and Facilities departments,

as well as any additional personnel who assist in completing these tasks. This includes

members working on the Mayall 4 Meter Telescope DESI Project.

3.0 Scope This document is a step by step procedure that outlines how to remove the electronics and

cables from the Cassegrain cage in the Mayall 4 Meter Telescope.

4.0 Definitions The acronyms and definitions referenced in this procedure are listed below.

4.1 4MAPS- 4 Meter Active Primary Support

4.2 AC- Alternating Current

4.3 ADC- Atmospheric Dispersion Corrector

4.4 DESI- Dark Energy Spectroscopic Instrument

4.5 ICCD- Intensified Charged Coupled Device

4.6 I/O- Input/Output

4.7 PMTC- Primary Mirror Temperature Control

4.8 RTD- Resistance Temperature Detectors

5.0 Training The training required for this procedure is as follows:

5.1 Fall Protection


2100-AD-015-0083.Docx of 14

6.0 Safety The safety documents required for this procedure are listed below.

6.1 Daily Briefing Form

6.2 JHA Form

6.3 Fall Protection SOP

6.4 Rescue Plan SOP

7.0 Personnel, Equipment and Materials Required

Process #/Personnel Notes

4M Cassegrain Cage Electronics and Cable Removal

3 (3)-Electronical Maintenance

Equipment/Part/Tool List Location Notes

Cable Ties EM Shop N/A

D-Ring Straps 4 Meter/3rd Floor (2) 3’ Straps

Diagonal Wire Cutters EM Shop (1) Flush Cut Diagonal

Fall Protection EM Shop or

4 Meter/3rd Floor N/A

Nut Driver EM Shop (1) ᵌ⁄₁₆”

Retractable Webbing Lanyard 4 Meter/3rd Floor (2) 20’ Lanyard (Miller Scorpion)

Screw Drivers EM Shop (1) Standard Set

8.0 Procedure 8.1 Hook in to the retractors on the underside of the cell (JHA-1).

8.2 Go up on the lift (JHA-2).

8.3 Begin facing the cage door.

8.4 Working to the left, begin removing the electronic racks that are left of the Cass cage

door (Figure 1) (JHA-3). Note: All of the racks have stops on them, so they are able to

be pulled out to access the cables on the back without falling out.


2100-AD-015-0083.Docx of 14

Figure 1: Cass Cage to the Left of the Door

8.5 The first rack contains the guider control and the instrument control (JHA-4).

8.5.1 Push down on the safety lock that is on top of the left rail.

8.5.2 Slide the rack out until it stops.

8.5.3 Remove the power cables that are plugged into the power strip behind the

prime focus power supply rack.

8.5.4 Remove all of the cables from the rear of the guider control box and the

instrument control box. Note: Attach a “to be removed” label to these cables.

8.5.5 Disconnect the two ground cables.

8.5.6 Remove the safety lock that is on top of the left rail.

8.5.7 Use two workers to slide the rack out and place it on the cart.

8.6 The second rack contains the prime focus power supply, the guide

probe/mirror/rotator power, and an Ethernet hub (JHA-5).



8.6.3 Remove the power cables from the prime focus power supply and the guide

probe/mirror/rotator power that are plugged into the power strip behind the

prime focus power supply rack.

8.6.4 Remove the prime focus power supply cables from the rear of the box. Note:

Attach a “to be removed” label to these cables.


2100-AD-015-0083.Docx of 14

8.6.5 Remove the Ethernet cables that are: Computer Room, F/8 baytech, mystery

cable, wavefront, and prime from the Ethernet hub. Note: Attach a “to be

removed” label to these cables.



8.7 The third rack contains the F/8 risley prisms and the rotator power(JHA-6).



8.7.3 Remove the risley prism cables which are: p2, p3, p4, p5, p6, p7, and a power

cable. Note: The power cable is with the box and it is plugged into the guide

probe power supply box. Attach a “to be removed” label to these cables.

8.7.4 Remove the rotator power box cables which are: p4, p5, p6, p8, and a power

cable. Note: The power cable is attached to the box. Attach a “to be removed”

label to these cables. P6 is permanently attached to the motor drive power

supply on rack 4.



8.8 The fourth rack contains the calibration light source power supply and the motor

drive power supply (Figure 2) (JHA-7).

Figure 2: Cass Cage to the Left of the Door




2100-AD-015-0083.Docx of 14

8.8.3 Remove the calibration light cables which are: p1, p2, p3, and a power cable.

Note: The power cable is with the box and it is plugged into the guide probe

power supply box. Attach a “to be removed” label to these cables.

8.8.4 Remove the motor drive cables that are on the other end of the p6 cable from

the rotator power box and a power cable. Note: The power cable is attached

to the box. Attach a “to be removed” label to these cables.



8.9 The fifth rack is the ICCD sync generator (Figure 3) (JHA-8). Note: This rack is not on

rails. Therefore, it will not slide out.

Figure 3: ICCD Sync Generator

8.9.1 Remove all of the connectors on the front panel. Note: Attach a “to be


8.9.2 Disconnect the cables that are on the back of the rack. These cables are: ICCD

y, ICCD x, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, and a power cord. Note: The

power cable is with the box. Attach a “to be removed” label to these cables.

8.9.3 Use two workers to hold up the rack, unbolt it, and place it on a cart.

8.10 The sixth rack is the F/8 servo amps, the F/8 controller, and an AC powered Ethernet

switch (Figure 4) (JHA-9).


2100-AD-015-0083.Docx of 14

Figure 4: Cass Cage to the Right of the Door



8.10.3 Remove the F/8 servo amp cables which are: p1, p2, p3, p4, p5, p6, p7, and a

power cable. Note: The power cable is with the box. Attach a “to be removed”

label to these cables.

8.10.4 Remove the F/8 controller cables which are: p1, p2, p3, p4, p6, p7, p8, an

Ethernet cable that is labeled F/8 baytech, and a power cord. Note: The

power cable is with the box. Attach a “to be removed” label to all of these

cables except for the Ethernet cable that is labeled F/8 baytech. P8 is a db9

cable that is hanging out of the box. The F/8 controller chassis needs to be slid

forward to disconnect the F/8 baytech Ethernet cable.

8.10.5 Remove the AC powered Ethernet switch cables. Note: These are the AC

cables that go to 4MAPS, PMTC, wavefront, F/8 amps, and F/8 control.



8.11 The seventh rack is the N2 and the wavefront camera control (JHA-10).



8.11.3 Disconnect the three N2 hoses from the three flow gauges.


2100-AD-015-0083.Docx of 14

8.11.4 Remove the wavefront camera control cables which are: p6 (db9, female), p7

(db9, male), p8 (db25, male), p1, p3, p4, p2, p5, and a power cord. Note: The

power cable is with the box. Attach a “to be removed” label to these cables.



8.12 The eighth rack is the PMTC and 4MAPS (JHA-11).



8.12.3 Remove the PMTC cables which are: p1, p2, p3, p6, p7, p8, p9, p10, and a

power cord. Note: The power cable is with the box. Attach a “to be removed”

label to these cables. These cables will be reinstalled, so ensure the existing

labels are readable. If they are not, create a new label and put it on the cable.

8.12.4 Slide out the PMTC chassis and remove the cable on that inside that says

PMTC.

8.12.5 Remove the 4MAPS cables which are: p1, p2, p3, p5, p6, p7, p8, p9, p11, p12,

p13, and a power cord. Note: The power cable is with the box. Attach a “to be

removed” label to these cables. These cables will be reinstalled, so ensure the

existing labels are readable. If they are not, create a new label and put it on

the cable.



8.13 Disconnect the remaining connectors and cables. Remove the cables that go

through the sides of the Cass cage and tie them back and out of the way so the Cass

cage can be removed (JHA-12).

8.14 There are four patch panels on the North side of the cage that needs to be removed

(JHA-13). The cables in the front must be removed first, the panels must be removed

second, and the connectors on the panels must be removed last (Figure 5).


2100-AD-015-0083.Docx of 14

Figure 5: North Side of Cass Cage

8.14.1 F/8 Servo Encoding I/O:

8.14.1.1 Disconnect channels a, b, and c on the front. Note: Attach a “to be


8.14.1.2 Disconnect a, b, c, and d on the back. Note: Attach a “to be

removed” label to these cables. These are all db9 connectors.

8.14.2 CCNS:

8.14.2.1 Remove p3, p10, and p13. Note: Attach a “to be removed” label to

these cables.

8.14.3 ACCNS:

8.14.3.1 Remove p31, p32, and p37. Note: Attach a “to be removed” label to

these cables.

8.14.4 ACOR:

8.14.4.1 Remove the four screws that attach the panel. Disconnect p31, p32,

p33, p36, p37, p38, p34, p35, p40, and p41.

8.15 Remove the six fiber pairs from the PF fiber optic box (JHA-14).

8.16 Remove the six fiber pairs from the IR fiber optic box (JHA-15).

8.17 Disconnect the main N2 line that is feeding down into the cage (JHA-16). Note: There

is a disconnect outside of the cage on the SW side.

8.18 Disconnect the PMTC RTD cable and feed it out of the cage (JHA-17).


2100-AD-015-0083.Docx of 14

8.19 In preparation for feeding the cables through the cage so they are outside of it, the

cables must have the cable ties that secure them to the cage removed. Note: There

are also bundles of cables with tags on them that do not get removed.

8.20 Use two workers to feed the cables through the sides of the cage (JHA-18).

8.20.1 Two workers must be hooked up to the safety retractors inside the cage.

8.20.2 One worker must sit in the horseshoe and hook up to one of the straps that

are hanging from the telescope truss.


8.22 Disconnect the J30 cable (JHA-20).

8.23 Feed all of the cables through the sides of the cage (JHA-21).

8.23.1 The worker who is in the horseshoe will have to help pull the cables as the

other workers in the cage pass them out on the North side.

8.24 Tie all of the cables out of the way so that the Cass cage can be removed (JHA-22).

8.25 Hook in to the retractors on the underside of the cell (JHA-23).


8.27 Locate the three loadcell cables that were connected to the 4MAPS chassis (JHA-25).

Feed them out of the cable run on the Southeast side. Note: In order to remove the

cables, cut the cable ties on the tie bases that are mounted on the weights. Tie the

cables to the bottom of each loadcell (Figure 6).

Figure 6: Gray Primary Mirror Load Cell Cables Wire-Tied to the Bottom of Loadcell

8.28 Locate the rotator brake cable, disconnect it, and feed it into the cell (JHA-26).

8.29 Locate the heidenhain encoder cable, disconnect it, and feed it into the cell (JHA-27).


2100-AD-015-0083.Docx of 14

8.30 Disconnect the ADC cable inside the stack and feed it into the cell (JHA-28).

8.31 Disconnect the thermocouples in the stack and feed the free end into the cell (JHA-

29).

8.32 Disconnect the air hose inside the stack for the rotator brakes and feed the free end

into the cell (JHA-30).

8.33 Ensure all of the cables, wires, hoses, etc. are disconnected from the Cass cage (JHA-

31). Note: If any of these items are found, remove them and annotate what they are

and where they were located.

8.34 Go down on the lift (JHA-32).

8.35 Once down, all workers must hook their safety retractors to the net guide wire (JHA-

33).

8.36 Turn the telescope over to the team that is removing the primary mirror and have

them remove the cage. Note: Refer to the Mayall 4M Primary Mirror Removal and

Installation Procedure (2100-AD-015-0005) and its corresponding JHA.

8.37 Two workers are needed to remove the three dial indicators.

8.38 Hook into the retractors on the underside of the cell (JHA-34).


8.40 Disconnect the two wires from each switch and feed them into the mirror cell to

ensure they are out of the way (JHA-36).

8.41 Remove the dial indicators from the cell (Figure 7) (JHA-37).

Figure 7: Primary Mirror Dial Indicator and MAPS Lift Off Switch


2100-AD-015-0083.Docx of 14

8.42 Turn the telescope over to the team that is removing the primary mirror. Note: Refer

to the Mayall 4M Primary Mirror Removal and Installation Procedure (2100-AD-015-

0005) and its corresponding JHA.

9.0 Procedure Review This procedure must be reviewed by employees under the following terms:

9.1 Initially

9.2 When there is a change in any of the job processes

9.3 When there is a change in a worker’s status, or job title

9.4 When governing authorities (such as OSHA) make changes

10.0 Records The records that must be kept on file by the supervisor are listed below. Training records

must be available and maintained for a minimum of five years.

10.1 Daily Briefing Form Signature Page(s)

10.2 JHA Signature Page(s)

10.3 Personnel Training Records:

10.3.1 Fall Protection

11.0 References DOCUMENT NUMBER DOCUMENT TITLE

1000-AD-015-0003 Fall Protection Plan SOP

1000-AD-015-0004 Rescue Plan SOP

2100-AD-015-0005 Mayall 4M Primary Mirror Removal and Installation Procedure

2100-AD-015-0005-JHA Mayall 4M Primary Mirror Removal and Installation Procedure

oc #: 2100 a 015 0083 revision: 4m ass age lectronics and ...2100-ad-015-0083.docx page 9 of 14...

Documents