ARMY *TM 9-6115-464-34 AIR FORCE TO-35C2-3 ... - Igor Chudov

ARMY TM 9-6115-464-34AIR FORCE TO 35C2-3-445-2NAVY NAVFAC P-8-624-34(12) After Element No. 3 has tripped, connect the VOM between pins F and J to check for continuity.Continuity should exist after Element No. 3 has tripped.(13) Slowly decrease shaft speed while monitoring pin D with the VOM for voltage. There should be 24volts present, dropping to 0 volts when Element No. 2 resets. “Reset speed” for Element No. 2should be no more than 100 RPM below the trip speed noted in step (10).(14) Continue decreasing shaft speed while measuring for continuity between pins A and C with the VOM.Continuity should exist between these two pins until Element No. 1 resets, then an open circuitshould exist. Reset speed for Element No. 1 should be no more than 100 rpm below the trip speednoted in step (6).(15) Decrease shaft speed to 0 rpm. Monitor pin H for voltage with the VOM. Element No. 3 should stillremain in the tripped condition, resulting in 0 volts on pin H, and continuity between pins F and J.(16) Depress and release the reset switch, S1, on the speed switch. Pin H should now read 24 volts onthe VOM, and an open circuit should exist between pins F and J.NOTEThere are no repair or adjustment procedures for the electronics and base assemblies.If this portion of the speed switch is malfunctioning, replace both assemblies as a unit.k. Testing (Mechanical Type).(1)(2)(3)(4)(5)(6)Connect a variable speed drive device to the speed switch drive. The drive device must have atachometer in order to determine the speed of the device in rpm’s.With an ohmmeter on the R1 scale, reading from the speed switch connector, check for the contactconditions of elements S9-1, S9-2, and S9-3 illustrated in figure 3-16, sheet 2.When contact conditions are verified, as shown in figure 3-16 sheet 2, start variable drive andgradually increase speed, with ohmmeter connected to pins B and A. At a speed of 290 rpm theohmmeter should indicate that contact A-B opens. Hold the variable speed drive at that speed andtransfer the ohmmeter leads to pins A and C. The ohmmeter should indicate a closed contact.Leave the ohmmeter leads connected to pins A and C and gradually reduce speed. In the range of190 to 210 rpm, the contacts of element S9-1 should reset to the condition illustrated in figure 3-16,sheet 2. To verify operation of element S9-1 contacts A and C, increase drive speed gradually andobserve that the contacts close in the 290 to 310 rpm range.Connect ohmmeter leads across pins D and E and verify an open circuit. Increase drive speed andobserve that element S9-2 (contacts D and E) closes in the speed range of 590 to 610 rpm (Mode l),825 to 850 rpm (Mode II). Gradually reduce speed to 490 minimum rpm (Mode l), 725 minimum rpm(Mode II). Observe that element S9-2 resets to the condition shown in figure 3-16, sheet 2.Connect ohmmeter across pins H and G and verify a closed circuit. Increase drive speed gradually.The contacts should open at a speed of 1200 to 1225 rpm. Hold drive speed and read contacts Fand J. Meter should indicate a closed circuit. Reduce drive speed to less than 1000 rpm, press themanual reset switch and observe with the meter that element S9-3 contacts reset to the conditionshown in figure 3-16, sheet 2.3-34