== Lid not closed completely ==

It may happen that the Lid is not closed completely, although the sensor claims it is in place.

* Make sure the bias voltage is turned off (in case it is already bright outside.
* open and close the Lid again

== Emergency Procedure ==

Find attached the emergency document for manual lid operation. 

Further documentation about the automatic lid, can be found at https://trac.fact-project.org/browser/firmware/ShutterController/docs

== Lid in Locked state

__Security Limit__

lidctrl goes to Locked (after closing the lid) in case the lid is not closed at the end of nautical twilight. 

__Solution__

- investigate why lidctrl went into Locked 
- check whether the lid is properly closed
- report in the logbook what happened
- in case you consider it safe, you may send UNLOCK

== Connection to lid arduino lost

This is not really a good solution, but at least it seems to work: 
When the connection to the lid-arduino is lost (lidctrl says only 'Ready' and the website 10.0.100.36 does not react), power the lid-arduino-mini-pc ('MiniPC Arduino' on 10.0.100.232) - powering the computer seems not to work, but at least it seems to reset the connection to the lid arduino

== How to grease the hinges

There should be a spray can of grease for motorbike chains. Please do NOT use anything other like WD-40, Molycote or so. This chain grease has a low viscosity immediately after it comes out of the can, so it can really go into the hinge, then it thickens... 
If the can is empty, please buy a new one in the hardware store of the San-Martin supermarket in Brenja-Baja.