Differences

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--- telescope_and_observatory_control [2025/05/01 19:12] – holtz
+++ telescope_and_observatory_control [2026/06/02 21:17] (current) – holtz
@@ Line 26: / Line 26: @@
 There is a magnetic home sensor installed on the E side of the dome; the home position when the magnet on the dome lines up with the sensor places the slit at an azimuth of 80 degrees.
+The lower dome shutter occasionally gets stuck in the closed position if the cable gets wrapped too tightly. If this happens, then the clutch will slip when shutter is commanded open. To get it unstuck, a screwdrive can be inserted in the right side of the winch and can be used to push the spring loaded catch down, after which you can pull on cable to release the tension.
 ==== Dome control ====
@@ Line 33: / Line 35: @@
 -pin connector J808A : Watchdog (dome box needs +24V or else shutter will close on Automatic)
 | Dome box |         |  Peltec timer | | | |
-| 1        | gnd     |    18   |   15 |   gnd | 15 connects to 18 for ~4 minutes after power is dropped between A1 and A2 |
+| 1        | gnd, white     |    18   |   15 |   gnd | 15 connects to 18 for ~4 minutes after power is dropped between A1 and A2 |
-| 3        | +24V DC |    28   |   25 |  +24V | same for 25 and 18 |
+| 3        | +24V DC, purple |    28   |   25 |  +24V | same for 25 and 18 |
 |          |         |    A1   |   relay 5 | gnd | trigger for relay, must cycle every 3 minutes to keep dome open (but don't leave energized permanently! |
 |          |         |    A2   |  +24V | | same |
@@ Line 42: / Line 44: @@
 connector J805A : Supplies power and ground to box, and relay for dome power (org yel blu wires)
 |J805A pin | 9 pin connector | function | comment |
-| 4 | 4 | +24V | voltage always supplied |
+| 4 | 4 | +24V red | voltage always supplied |
-| 3 | 1 | gnd  | ground always supplied
+| 3 | 1 | gnd white | ground always supplied
 | 2 | 2 |relay 1 grey | trigger connects pin to ground |
 connector J806A : Supplies (redundant?) power and ground to box, and relay for dome direction (brn red grn wires)
 |J806A pin | 9 pin connector| function | comment |
-| 4 | 9 |+24 | voltage always supplied |
+| 4 | 9 |+24 red | voltage always supplied |
-| 3 | 8 | gnd | ground always supplied
+| 3 | 8 | gnd white | ground always supplied
 | 2 | 7 | relay 3 brown | trigger connects pin to ground |
@@ Line 55: / Line 57: @@
 | J807A pin| function | comment |
 | 2 | relay 2 purple | trigger connects pin to ground |
-| 3 | gnd| ground always supplied |
+| 3 | gnd black| ground always supplied |
 | 4 | relay 4 orange | trigger connects pin to ground |
-| 5 | gnd | ground always supplied |
+| 5 | gnd black | ground always supplied |