TM 9-6115-604-34
NAVFAC P-8-633-34
b.
Current-Transducer AMT Removal. See Figure 10-8.
WARNING
Do not work on energized equipment Generator set must be shut down. Transducer voltage
and current Inputs and outputs are hazardous. Performing maintenance on energized
transducers may result In Injury or death.
(1)
Tag and disconnect wires from current transducer AMT (2).
(2)
Remove screw and captive washer assemblies (1) to remove current transducer AMT (2).
c.
Current Transducer AMT Bench Test. See Figure 1-10.
WARNING
Currents and voltages used during test are hazardous If safety precautions are not observed.
Do not touch current source leads when they are energized; Injury or death may result.
(1)
Connect current transducers AMT into the test setup shown in Figure 10-10.
(2)
Apply balanced, three phase AC current, 50 or 60 hertz, at 2, 3, and 4 amperes. Record microampere
output readings for each input current level.
(3)
Verify that microampere output readings at AMT terminals 2C, 2B, and 2A are always identical for a given
current input. For example, when input is 2 amperes, output should be 54 microamperes at 2C, 54
microamperes at 2B, and 54 microamperes at 2A
(4)
Verify that microampere output (æAe ) agrees with current input (lin) as shown in TEST DATA section of
Figure 10-10.
(5)
If desirable to test at input current levels other than 2, 3, or 4 amperes, use TEST EQUATION section of
Figure 10-10 to compute expected microampere output (æAe ) for a given current input (Iin).
(6)
If test results indicate transducer AMT is defective, replace. If not, reinstall. Refer to step d, below.
d.
Current Transducer AMT Installation. Refer to Figure 10-8.
(1)
Install current transducer AMT (2) and secure with screws and captive washer assemblies (1).
(2)
Make wiring connections to current transducer AMT as tagged. Remove and discard tags.
e.
Frequency Transducer Al 03 On Equipment Test.
WARNING
Do not work on energized equipment. Generator set must be shut down. Transducer voltage
and current Inputs and outputs are hazardous. Performing maintenance on energized
transducers may result In Injury or death.
(1)
With generator set shut down, open upper cabinet B door. Refer to Figure 10-11. Connect a frequency
counter into the line connected to transducer Al 03 terminal 1.
(2)
Start the generator set in accordance with the Operator and Organizational Maintenance Manual.
(3)
When the engine has reached operating speed, compare the frequency indicated by the frequency counter
with the frequency indicated by frequency meter Ml 03 (located on cabinet B door).
10-19
