SPEC-0140 Appendix A

STO

Safe Torque Off

Safe Stop Category 0

Category 0 is an uncontrolled stop by immediately removing power to the machine actuators.[TRW2] [TRW3] 

SS1

Safe Stop 1

Safe Stop Category 1

Category 1 is a controlled stop with power to the machine actuators available to achieve the stop then removal of power when the stop is achieved.[TRW4] 

SDI

Safe Direction

ensures that the actuators can only move in the selected direction

SLS

Safely Limited Speed

ensures that the actuators do not exceed a defined speed limit

O

Open

certain components that can block the light are configured to allow light to pass

C

Close

certain components that can block the light are configured to block the light path

Safety Function

PL_r

SIL

M1 Mirror Cover

Entrance Aperture

Safety Shutter

Coolant Pump

M2 Actuators

Telescope Alt Axis

Telescope Az Axis

Coudé Axis

Enclosure Carousel

Enclosure Shutter Axis

Enclosure Bridge Crane

Enclosure Jib Crane

TEOA Access Platform

Enclosure Rear Door

Vent Gates

Carousel Coolant Pumps

Exterior Boom Lift

Interior Boom Lift

Platform Lift

Coudé Lab Crane

Remarks

Emergency Stop

e

3

C

C

SS1

SS1

SS1

STO

STO

STO

STO

STO

STO

STO

STO

STO

STO

STO

Heat Stop Over Temperature

C

C

C

Heat Stop Low Coolant Pressure

C

C

Heat Stop Low Coolant Flow

C

C

Heat Stop Coolant Leak

C

C

STO

M2 Over Temperature

C

C

M2 Coolant Leak

C

C

STO

TEOA Module Removed

SS1

Heat Stop Removed

C

C

C

SS1

Feed Optics Over Temperature

C

C

C

Feed Optics Low Coolant Pressure

C

C

C

Feed Optics Low Coolant Flow

C

C

C

Feed Optics Coolant Leak

C

C

C

STO

Feed Optics Out of Position

Feed Optics Removed

SS1

Telescope Azimuth Drive Over Current

SS1

Telescope Azimuth Drive Over Temperature

SS1

Telescope Azimuth Brakes Not Released

SS1

Telescope CW Final Limit

SS1

Telescope CCW Final Limit

SS1

Telescope End Stop Position

Telescope Azimuth Cable Wrap Over Tension

SS1

Telescope Azimuth Manual Lockout Pin

SS1

Telescope Azimuth Pendant Connected

Telescope Azimuth Trapped Key Interlock

SS1

Enclosure Bridge Crane Not Stowed

SS1

SS1

Enclosure Jib Crane Not Stowed

SS1

SS1

TEOA Platform Not Stowed

SS1

SS1

Man Lift Not Stowed

SS1

SS1

Telescope Elevation Brakes Not Released

SS1

Telescope Zenith Final Limit

SS1

Telescope Horizon Final Limit

SS1

Telescope Elevation Cable Wrap Over Tension

SS1

Telescope Elevation Manual Lockout Pin

SS1

Telescope Elevation Pendant Connected

Telescope Elevation Trapped Key Interlock

SS1

Telescope Not Parked at Horizon

STO

STO

STO

M1 Mirror Cover Open End-of-travel Limit

SDI

M1 Mirror Cover Closed End-of-travel Limit

SDI

M1 Mirror Cover Motor Over Current

STO

M1 Mirror Cover Motor Brake Engaged

M1 Mirror Cover Motor Brake Released

Telescope Floor Access Panels Not Closed

SS1

SS1

M5/M6 Access Platform Not Stowed

SS1

[TRW1] 

Access Doors Not Closed

SS1

SS1

Telescope Azimuth Cable Wrap Access

SS1

Telescope Azimuth Mechanical Level Access

SS1

Coudé Rotator Azimuth Drive Over Current

SS1

Coudé Rotator Clockwise End-of-travel Limit

SS1

Coudé Rotator Counter Clockwise End-of-travel Limit

SS1

Coudé Rotator Azimuth Cable Wrap Over Tension

SS1

Coudé Rotator Trapped Key Interlock

SS1

Coudé Rotator Access Ladder Not Stowed

SS1

Coudé Mezzanine Platform Not Stowed

SS1

Coudé Floor Access Panel Open

SS1

Coudé Lab Crane Not Stowed

SS1

Coudé Electronics Rack Door Open

SS1

Enclosure Carousel Drive Over Temperature

STO

Enclosure Carousel Clockwise End-of-travel Limit

STO

Enclosure Carousel Counter Clockwise End-of-travel Limit

STO

Enclosure Carousel Clockwise Final Limit

STO

Enclosure Carousel Counter Clockwise Final Limit

STO

Enclosure Carousel Cable Wrap Over Tension

STO

Enclosure Carousel Pendant Connected

SLS

Enclosure Carousel Manual Lockout Pin

STO

Enclosure Shutter Drive Over Current

STO

Enclosure Shutter Drive Over Speed

STO

Enclosure Shutter Drive Over Temperature

STO

Enclosure Shutter Horizon Final Limit

STO

Enclosure Shutter Zenith Final Limit

STO

Enclosure Shutter Cable Wrap Over Tension

STO

Enclosure Bridge Crane Not Stowed

C

SS1

SS1

STO

Enclosure Bridge Crane Interlock

STO

Enclosure Jib Crane Not Stowed

STO

Enclosure Jib Crane Interlock

STO

Enclosure Entrance Aperture Interference

O

Enclosure Entrance Aperture Open End-of-travel Limit

STO

Enclosure Entrance Aperture Closed End-of-travel Limit

STO

TEOA Access Platform Not Stowed

SS1

SS1

Enclosure Rear Door Interference

O

Enclosure Rear Door Open End-of-travel Limit

STO

Enclosure Rear Door Closed End-of-travel Limit

STO

Carousel Coolant Over Pressure

STO

Carousel Coolant Supply Tank Level

STO

Carousel Coolant Leak Detected

STO

Carousel Dehumidification High Humidity

Carousel Dehumidification High High Humidity

Facility Fire Alarm

SS1

SS1

SS1

SS1

SS1

Exterior Boom Lift Not Stowed

STO

STO

Interior Boom Lift Not Stowed

SS1

SS1

Platform Lift (PFlow lift) above utility

STO

Enclosure Hazardous Zone

e

3

STO

Telescope Hazardous Zone

e

3

SS1

SS1

Observing Floor Hazardous Zone

e

3

SLS

Service Ring Hazardous Zone

e

3

SS1

STO

Catwalk Hazardous Zone

e

3

STO

Utility Level Hazardous Zone

e

3

SS1

Coudé Lab Hazardous Zone

e

3

SLS

Mezzanine Hazardous Zone

e

3

SS1

Inner Pier Hazardous Zone

e

3

SS1