Maintenance & Inspection Guide Edge 400A Series - Johnstech

Contactor CleaningEdge 400a SeriesThorough Cleaning ProcedureWhen the Contactor has heavy debris buildup, performa thorough cleaning with an Ultrasonic Cleaner.Only execute this procedure in a well-ventilated areawith an exhaust hood.CAUTION: The Ultrasonic Cleaner should have a maximumpower of 500W and a catch basket in the tank that preventsthe Contactor from touching settled debris.Figure 30: Example of Cleaninga Housing in an UltrasonicCleaner; note left position.Step 1— Prepare the HousingA. Remove the Contactor from the Load Board per instructionson Page 10, Step 2.B. Disassemble the Contactor per instructions on Page 12.Step 2— Prepare the BathPrepare a bath of diluted Isopropyl Alcohol (70/30 Alcohol/Water) OR a heated (50ºC max) mild acidic (7.1 > ph > 3.0)solution.NOTE: If a Sonic Cleaner is unavailable, gently brush theHousing with bath solution (see above), rinse in DeionizedWater and dry Housing out completely.Figure 31: Example of Rinsinga Housing in an UltrasonicCleaner; note right position.Step 3— Perform the CleaningOperate Ultrasonic Cleaner per Manufacturer’s Instructions only.A. Fully immerse the Housing Device-side up in the bathand run for a 10-minute cycle. See Figure 30.B. Remove Housing from bath and sonic rinse with DeionizedWater for 10 minutes. See Figure 31.Step 4— Dry the ContactorCurrent leakage may occur during testing if moisture remainson the Contacts. To prevent this:A. Carefully pat the Contactor dry with a lint-free cloth.B. Blow the Contactor dry with heated air.C. If necessary, place in oven for 10 minutes.CAUTION: DO NOT use heat guns to blow Contactors dry.Heated air should not exceed 100ºC or be utilized for longerthan 30 minutes. A common Hair Dryer will suffice.Step 5— Reassemble the ContactorReassemble the Contactor per instructions on Pages 20-21.Step 6— Reinstall ContactorA. Inspect Contactor one final time for any debris, damageor moisture.B. Remount Contactor to Load Board per instructions onPage 11, Step 7.19www.johnstech.com©2009 Johnstech International CorporationAll rights reserved.