1,077
edits
Door control system/Logbook: Difference between revisions
From London Hackspace Wiki
→2010-10-12
| Line 4: | Line 4: | ||
== 2010-10-12 == | == 2010-10-12 == | ||
People are reporting the solenoid not triggering properly. This could be the bolt getting caught against the strike plate, so will test tonight. | * People are reporting the solenoid not triggering properly. This could be the bolt getting caught against the strike plate, so will test tonight. | ||
** This is due to people not disengaging the door wedge before closing it. If this is done correctly then the bolt disengages correctly. [[User:Solexious|Solexious]] 00:58, 16 October 2010 (UTC) | |||
Added a diode across the solenoid (there was already one over the relay to protect the transistor). This stops a large negative voltage spike from being transmitted down the wires and potentially burning of the relay contacts, but note that this spike only appears on the opened relay contact - it does not reach the circuit except via capacitative coupling or contact arcing. The diode was fitted after the reports of the solenoid not triggering, but if it needs to be removed it is fitted to the chocblock just above the letterbox and can be disconnected easily. - artag | Added a diode across the solenoid (there was already one over the relay to protect the transistor). This stops a large negative voltage spike from being transmitted down the wires and potentially burning of the relay contacts, but note that this spike only appears on the opened relay contact - it does not reach the circuit except via capacitative coupling or contact arcing. The diode was fitted after the reports of the solenoid not triggering, but if it needs to be removed it is fitted to the chocblock just above the letterbox and can be disconnected easily. - artag | ||
