TM 11-6125-240-34
b. Plug the power test set prods into the inverter test
(8) R e p l a c e t h e
regulator cover.
point jacks, and apply power to the inverter.
3-10. Adjustment of Output Frequency
Output frequency potentiometer L1 on CSV2215-3 (R3
dication of 400 Hz.
on CSV1186-1), and R5 on 4B93-1-A is used to estab-
lish the 400 Hz ac output current. Follow the procedure
and full load conditions. A variation of less than 8 Hz is
below for adjustment.
acceptable.
NOTE
e. Disconnect power test set prods, and replace
This procedure can be carried out in the
regulator cover.
aircraft if the inverter can be reached easily.
a. Remove the regulator cover.
Section IV. DIRECT SUPPORT TESTING PROCEDURES
3 - 1 1 . General
level to accept the 4B93-1-A regulator. These units can
be identified by the letter "M" stamped on the data
These testing procedures have been prepared for use by
plate. For a listing of recent MWO's refer to DA Pam
direct support maintenance shops to determine the ac-
310-7.
ceptability of repaired equipment. These procedures
set forth specific requirements that repaired equip-
3-13. Tests and Procedures
ment must meet before being returned to the using
Equipment which meets the performance standards in
organization.
3-12. Modification Work Orders (MWO's)
service. Perform each step in sequence. For each step,
perform all the actions in the Control settings column,
At the time of this publication, there were no printed
then perform the specific procedure and verify it
MWO's pertaining to this equipment. However, inver-
against its performance standard.
ters, as they are received, are being modified at depot
Table 3-2. Physical Tests and Inspections
Control settings
Equipment
Test
Step
Performance standard
Test procedure
under test
equipment
No.
No dust, grease, dirt or carbon parti-
Inspect exterior and interior for
N/A
N/A
1
cles on surfaces.
overall cleanliness.
a. Screws, bolts, and nuts will be
a. Inspect mechanical assem-
N/A
N/A
2
tight; none missing.
blies for loose or missing
screws, bolts, or nuts.
b. Inspect ac connector and test
b. No looseness or damage evident.
points for looseness and
damage.
a. Inspect all components for
a. None evident.
N/A
N/A
3
cracked, burned,
or
damaged insulation.
b. No looseness evident.
b. Check regulator for security
of mounting.
c. No looseness evident.
c. Check all leads inside unit for
security.
Brushes are in good condition and
Check each ac contact brush in
N/A
N/A
4
seating is satisfactory. Refer to
turn for proper condition and
seating. Refer to paragraph
Control
settings
Equipment
Test
Step
Performance standard
Test Procedure
No.
under test
equipment
N/A
Be sure that all toggle switches
N/A
N/A
1
on the motor generator test set
are in the OFF position and
connect equipment as shown in
N/A
Zero all teat set meters, if neces-
N/A
Adjust power supply to 27.5 vdc
2
on test set dc VOLTS meter.
sary.
3-7
