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--- projects:unitronfrequencyconvert:start [2019/06/24 03:31]
dwheele [Notes]
+++ projects:unitronfrequencyconvert:start [2019/07/03 23:53] (current)
dwheele [Capacitors reinstalled]
@@ Line 44: / Line 44: @@
 * Called 2/5/2019, 9:50 a.m. PT, no answer.
 * Called 2/6/2019, talking with Barry
+===== Plug =====
+Replaced the plug which connects to the aircraft. The old one had a lot of corrosion, and the sockets look like they were not as tight around the pins as they should be. The new ones are silver plated copper.
+The general part number is MS25486, which is a standard. The part number on the original plug is 195-60044-1-30
+Replacement 400 Hz, AC 1/0 GPU Connector Plug, 6-Pole Female, $299.00 (received 6/21/2019).
 ===== Capacitors =====
@@ Line 50: / Line 64: @@
 There have been problems with the Unitron GPU. When connected to the Challenger 604, and when engaging heavy load (all of the hydraulic pumps), the Challenger disconnects from the power.
-After various troubleshooting activities, and after the manufacturer suggested it, I measured the AC Filter capacitors, and it appears that 11 of the 18 are not working.
+After various troubleshooting activities, and after the manufacturer suggested it, I measured the AC Filter capacitors, and it appears that 11 of the 18 are not working. That is, they don't show the 25 uf that they should have. Internally they may be open.
-Planning to order new ones from the manufacturer, or via 3rd party.
 /23/2019
+Talked to Barry today. He said the part number is 150-18065-1. He said to call back tomorrow X138 and they can sell me the capacitors. He thought they would be less than $15 each.
+/25/2019
+Ordered 18 capacitors from Unitron today, about $10 each, requesting fastest shipping.
+{{:projects:unitronfrequencyconvert:paid_cc_rec_cs8239.pdf|Receipt}}
+/26/2019
+Capacitors arrived, tested OK, installed in unit today.
+/27/2019
+{{:projects:unitronfrequencyconvert:2019_06_28_packinglist.jpg?direct&300|}}
+{{:projects:unitronfrequencyconvert:2019_06_28_certofcompliance.jpg?direct&300|}}
+Following is a diagram, drawn as though viewed from the top, and the bottom of the drawing is closest to the front door. It shows dots ("d") and lines that I drew on the white wires before removing them to do the capacitor replacement.
+{{:projects:unitronfrequencyconvert:2019_06_28_capwiringlabels.jpg?direct&300|}}
+Measured capacitors after removal. As expected, 11 were bad, 7 were good. The 7 good ones I put into the tool cabinet in the hangar.
+==== Capacitors reinstalled ====
+In addition to installing replacement capacitors, I also tightened the push-on connectors for better connections.
+{{:projects:unitronfrequencyconvert:fr_408_size1024.jpg?direct|}}
+They report that the GPU is not working correctly with the Challenger 604. 7/3/2019.
+==== New Capacitor Closeup ====
+{{:projects:unitronfrequencyconvert:fr_406_r.jpg?direct&300|}}

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