TB 9-4920-455-35
7. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUTS(S) to minimum after each step within the
performance check where applicable.
NOTE
Screw the magnetic pickup in until it just touches the
interrupter screws. Then, back out the magnetic pickup 1/6 turn
to provide clearance. Tighten jam nut on magnetic pickup.
b. Connect TI power cable to dc power supply using cable supplied with TI.
c. Set power supply ON-OFF switch to ON and adjust output for 28 volts.
d. Remove two opposite pairs of interrupter screws on TI rotor disc, leaving only two
opposite single screws.
lead.
f. Set TI CAM RATE (RPM) switch to 1800.
g. Set TI MOTOR ON switch to MOTOR ON.
8. RPM Test
a. Performance Check
(1) View rotor disc under ordinary fluorescent room lights (60 Hz) and adjust TI
1800 RPM pot until outer ring appears stopped. Frequency counter will indicate 30 1 Hz.
NOTE
If frequency counter does not indicate 30 1 Hz, take corrective
action to insure line frequency of fluorescent lighting is 60 Hz.
NOTE
To convert frequency counter indication to RPM, multiply by 60.
(2) Set TI CAM RATE (RPM) switch to 900.
(3) Adjust 900 RPM pot until next ring on the rotor disc appears stopped.
Frequency counter will indicate 15 1 Hz.
(4) Set TI MOTOR ON switch to down position.
(5) Disconnect lead from magnetic pickup on TI.
(6) Replace two opposite pairs of interrupter screws on TI rotor disc.
