----------------------------------------------------------------------------- Mauna Loa Solar Observatory Observer's Log ----------------------------------------------------------------------------- Fri May 23 16:44:54 GMT 2003 Year: 03 Doy: 143 Observer: yasukawa WEATHER COMMENT: Fri May 23 16:44:58 GMT 2003 Cool, clear, no wind. COMMENT: Fri May 23 16:45:58 GMT 2003 Read HELCO meters on the way up this morning. Fri May 23 16:52:08 GMT 2003 CHIP Start Patrol Fri May 23 16:52:16 GMT 2003 MKIV Start Patrol Fri May 23 16:52:20 GMT 2003 PICS Start Patrol MKIV COMMENT: Fri May 23 16:52:24 GMT 2003 Centered O1 at startup. MKIV COMMENT: Fri May 23 17:45:27 GMT 2003 Centered O1. Fri May 23 18:01:40 GMT 2003 CHIP LSD Fri May 23 18:03:16 GMT 2003 MKIV End Patrol Fri May 23 18:03:29 GMT 2003 MKIV Start Cal Fri May 23 18:03:31 GMT 2003 CHIP End LSD Fri May 23 18:03:44 GMT 2003 CHIP BiasLSD Fri May 23 18:04:27 GMT 2003 PICS Flat Fri May 23 18:04:46 GMT 2003 CHIP End BiasLSD Fri May 23 18:05:01 GMT 2003 CHIP Bias Fri May 23 18:06:01 GMT 2003 CHIP End Bias Fri May 23 18:06:59 GMT 2003 PICS End Flat Fri May 23 18:22:15 GMT 2003 MKIV End Cal Fri May 23 18:22:26 GMT 2003 MKIV Start Patrol MKIV COMMENT: Fri May 23 18:40:09 GMT 2003 Centered O1. **PSPT PROBLEM**: Fri May 23 19:31:40 GMT 2003 Remounted dome shutter drive gear platform. By using the hand crank to check out the mesh between the main gear and the track, the force needed to move the dome shutter near its closed position is greater than at its open position--may be gravity but could be difference in track to side-rail differences causing more friction. Fri May 23 19:36:42 GMT 2003 PICS End Patrol COMMENT: Fri May 23 19:36:50 GMT 2003 Stopping to reconfigure dome shutter. Fri May 23 19:36:46 GMT 2003 CHIP End Patrol Fri May 23 19:39:14 GMT 2003 MKIV End Patrol MKIV COMMENT: Fri May 23 19:43:38 GMT 2003 Centered O1. Fri May 23 19:44:23 GMT 2003 MKIV Start Patrol Fri May 23 19:44:39 GMT 2003 CHIP Start Patrol Fri May 23 19:44:50 GMT 2003 PICS Start Patrol MKIV COMMENT: Fri May 23 21:03:56 GMT 2003 Centered O1. **PSPT PROBLEM**: Fri May 23 21:28:14 GMT 2003 Wired up the start capacitor and reinstalled new motor and wiring. Tested open/close function and it worked well. Darryl's and Allen's wiring analysis concurred and were correct. Buttoned things up, put away tools and updated documentation. !!! That toolbox and tool set we acquired was sure worth it !!! WEATHER COMMENT: Fri May 23 21:31:19 GMT 2003 In scattered orographic clouds. PSPT COMMENT: Fri May 23 21:40:08 GMT 2003 Observing! -- Uh... I'll need to stop program for a bit. Wire retaining ring holding the rubber bumper onto diffuser/dustcap fell off upon opening--may have abraded it off manipulating cables and ladders on the platform during dome shutter repair. I also found the blue wire nut I lost (replaced with one from inventory). Must have been on or near the dust cap. **PSPT PROBLEM**: Fri May 23 21:51:30 GMT 2003 Reattached wire retaining ring. PSPT COMMENT: Fri May 23 21:52:12 GMT 2003 Resume observations. MKIV COMMENT: Fri May 23 21:53:56 GMT 2003 Centered O1. COMMENT: Fri May 23 22:14:17 GMT 2003 Manually rotated dome thru tight fit at midday. MKIV COMMENT: Fri May 23 23:25:01 GMT 2003 Centered O1. WEATHER COMMENT: Fri May 23 23:29:33 GMT 2003 Gusty winds. MKIV COMMENT: Sat May 24 00:18:05 GMT 2003 Centered O1. **PSPT PROBLEM**: Sat May 24 02:10:13 GMT 2003 Not sure what initial cause of the shutter motor failure was, but windings in old motor appear OK, there may be shorts due to burnt enamel insulation between wires in winding, though. No shorts between start winding and run windings. Capacitor blew because it was energized for too long a period when the motor stalled and centrifugal switch remained closed, energizing the start windings. Centrifugal switch mechanism is made of plastic and it was melted due to the heat of the windings I would guess, and that disabled it's function preventing the switch to open and remove the current to the start windings and to the capacitor. My guess is the shutter or gearing slowed the motor enough (>75%) so that the centrifugal switch closed the start circuit and blew the capacitor after a while. The heat from the now stalled motor windings, melted the centrifugal switch plastic parts. COMMENT: Sat May 24 02:20:20 GMT 2003 Spar has reached the cable stretch point. Losing guiding. Shutting down. Sat May 24 02:20:43 GMT 2003 CHIP End Patrol Sat May 24 02:22:48 GMT 2003 PICS End Patrol Sat May 24 02:24:47 GMT 2003 MKIV End Patrol PSPT COMMENT: Sat May 24 02:25:12 GMT 2003 Aborted PSPT observations and shutting it down. PSPT COMMENT: Sat May 24 02:29:07 GMT 2003 Dome closed OK. 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