Figure 4-18. Load Selector Switch Contact Positions

F i g u r e 4 - 1 6 . W i r i n g D i a g r a m , L o a d B a n k

TM-5-6115-545-12 Power Unit Utility Pack Gas Turbine Engine Driven (Air Research Model PPU85-5) Non-Winterized and (Air Research Model PPU85-4) Winterized Manual
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Figure 4-17. Figure 4-18. (2) Installation. Place wiring harness (7) or (94) in position, install all harness clamps (5), (12), (92), and (93), and reconnect electrical leads to com- ponents. Remove tags. 4 - 4 4 . L o a d B a n k C o n t r o l P a n e l A s s e m b l y . a. R~tary Switches. (1) Inspection. Remove cover ( 9 , f i g . 4 - 1 4 ) and insr)ect switches (23) and (36) for freedom of ., movement between positions. minals for loose connections. switches for cracks, breaks, damage, ‘ Check all contact ter- Check body of corrosion, and other (2) Testing. To test the rotary selector switches use a multimeter and proceed as follows: (a) Remove switch knobs ( 1 8 a n d 2 5 , f i g . 4 - 1 4 ) and switch mounting screws (21), (30), and (32), and remove switches (23) and (36) from panel (56). (b) Test for continuity between the termi- nals illustrated in f i g u r e 4 - 1 7 for the voltage selec- tor switch ( 3 6 , f i g . 4 - 1 4 ) and f i g u r e 4 - 1 8 for the load selector switch ( 2 3 , f i g . 4 - 1 4 ) . Sequentially select each position and refer to the particular figure for the contacts that are closed. All closed circuits shall read zero ohms. All open circuits shall read 5 ohms to infinity. C h a n g e 4 4 - 4 1

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