ECS

Controls enclosure and related building systems. Communicates with TPLC, UPS (Net-SNMP library).

digraph G { rankdir=LR node [shape=box, style=filled] TCS [fillcolor=gray] ECS [fillcolor=yellow] TPLC [fillcolor=lightblue] TCS -> ECS [dir=both] ECS -> TPLC [dir=both] }

ECS ALH Guidance

Air Compressors

Chillers

Dome Cooling

Exhaust Fans

Hydrostatic Oil Bearing

1. If the HBS temperature is in warning:
   • The temperature TT0423 is out of range from nominal by +/-5 C or the recirculation pump is off.
2. If the HBS temperature is in alarm:
   • The temperature TT0423 is out of range from nominal by +/- 10 C. Put the valve into manual mode to position the modulating value.

Instrument Cooling

These instructions are obsolete and no longer referenced from the ALH GUI. The thermal computer does not exist. Dan has not updated the notes yet (May-2017)

1. If the timestamp and many of the environmental entries on the Details Panel or the temperatures on the Telescope Temperatures Panel are in alarm:
   • Ensure the thermal computer is running and on the network by pinging the machine "thermal" (IP: 192.168.18.45).
   • Type "ping -c 5 thermal" to check if the thermal computer is alive.
   • If it is not running, you will have to reboot the machine which is located in the lower-left treehouse.
   • Check if the ECS process is still running on the thermal computer. If the process is not running or is stuck, you will need to restart it. Log onto the thermal computer as root. Do "ps -ef | grep ICserver" which is the ECS process. If you do not see this process or suspect it is stuck, type "./start_IC" in the home directory. This command will change to the proper directory, rename the current log file, kill any existing process, and restart the process. Do the "ps -ef | grep ICserver" again to make sure the process has restarted.

Lighting

Mirror Ventilation

Shutter Doors

Stealth Exhaust Fans

Snow Melting

Fan, damper, or louver goes into alarm: The Snow Melting fans, dampers, louvers, and heaters are controlled indirectly, though the TO does have direct control of the fans in Manual mode. The commanded state of these mechanisms is a function of the requested Snow Melting state (e.g., View, Snow Melt, Ventilation). In Snow Melt mode a heater will run when it detects air flow from the appropriate fan, and the fan will only run when the associated dampers are open. Note: there is no direct feedback on the state of the heaters.

Ventilation Doors

Components in Multiple Subsystems

Dampers

Damper Fails to Open/Close and the damper is in Automatic mode:

1. If the damper has a "Clear Alarm" button,
   • try to clear the alarm, then
   • put the damper into Manual mode, and
   • issue a command.
   • If this does not work, you will need to contact mountain personnel to investigate the damper.

See the Snow Melting section for advice on those dampers.

Valves

Modulating valve Fails to Move or a Normally Open/Normally Closed valve Fails to Open/Close and the valve is in Automatic mode:

1. If the valve has a "Clear Alarm" button, try to clear the alarm, then
2. put the valve into Manual mode, and
3. issue a command.
4. If this does not work, you will need to contact mountain personnel to investigate the valve.