ARMY TM 9-6115-671-14
AIR FORCE TO 35C2-3-446-32
MARINE CORPS TM 09249A/09246A-14
5-40
a. Removal.
(1)
Shut down generator set, paragraph 2.11.2.
(2)
Open BATTERY ACCESS door (Figure 1-2), and disconnect negative battery cable.
(3)
Remove DCS control box assembly, paragraph 4.8.1.
(4)
Remove output box top panel, paragraph 5.8.1.
(5)
Tag and disconnect electrical leads from power potential transformer (10, Figure 5-4).
(6)
Remove locknuts (8), screws (9), and power potential transformer (10) from rear panel (33).
b. Testing.
(1)
Remove power potential transformer, step 5.8.6.a above.
(2)
Set multimeter for ohms, and take reading between terminals 1 and 2. Reading should be
between 2.1 and 2.6 ohms. If reading is not within these parameters, the transformer is defective
and must be replaced.
(3)
Take a reading between terminals 3 and 7. Reading should be between 2.2 and 2.8 ohms. If
reading is not within these parameters, the transformer is defective and must be replaced.
(4)
Take a reading between terminals 4 and 6. Reading should be between 4.2 and 5.2 ohms. If
reading is not within these parameters, the transformer is defective and must be replaced.
(5)
Check for an open circuit between terminals 1 and 3, 1 and 4, and 7 and 4. If continuity is
present between these points, the transformer is defective and must be replaced.
(6)
Turn on power source. Apply 208V RMS/60 Hz to terminals 1 and 2. Check voltage across
terminals 3 and 7. Reading should be between 139 and 171V RMS. Check voltage across
terminals 4 and 6. Reading should be between 23 and 29 V RMS. If reading is not within these
parameters, the transformers is defective and must be replaced.
(7)
Install power potential transformer, step 5.8.6.c below.
c. Installation.
(1)
Install power potential transformer (10, Figure 5-4), screws (9), and locknuts (8) on rear panel
(31).
(2)
Connect electrical leads to power potential transformer (10). Remove tags.
(3)
Install output box top panel, paragraph 5.8.1.
(4)
Install DCS control box assembly, paragraph 4.8.1.
(5)
Connect negative battery cable to battery, and close BATTERY ACCESS door.
