Quantcast Testing/Repair -706881037

 

Click here to make tpub.com your Home Page

Page Title: Testing/Repair
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Back
Installation/Assembly -706881036
Up
TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
Next
Testing/Repair-continued
TM 5-4210-233-14&P-1
5-66. APU GENERATOR-Continued
e. Testing/Repair.
NOTE
Testing of Generator consists of continuity checks using wiring
diagram (Appendix F).
NOTE
Most of the following tests can be performed without
disassembling the generator.  Clearly mark all leads dis-
connected, together with the point taken from.
(1) Armature. Remove all brushes from their holders.
(2) Using ohmmeter, check for continuity in the ac winding for an open circuit between the slip rings. If
an open circuit is found, replace the armature.
(3) Test both the slip rings and commutator for short or grounding to he shaft.
t
(4) To test the armature for an open circuit in the dc windings 'O" reading indicates open circuit. Check
continuity between all adjacent bars of the commutator. Visually inspect for bar burring, arcing and
poor cranking.
(5) Touch the probes to two adjacent bars and check for continuity. Move each probe over one bar and
check again.  Continue around the commutator.  Any adjacent bars that don't show continuity
indicate an open armature winding.
(6) This test can only be performed with the g nerator disassembled and requires a growler. To test for
e
shorts in the dc winding, place the armature in the growler. Operate the growler and pass a steel
strip back and forth over and above the armature windings. If the strip is magnetically attracted to
the armature at any point, a short is indicated. After testing in one position, rotate the armature
slightly and repeat the test. Do this for one complete revolution.
(7) If the test indicates a short circuit in the
dc windings, be sure the commutator is
clean.
Carbon dust, dirt or grease
between the bars or slip rings can cause
a short.
(8) If the tests show that the armature is
defective, replace it.
(9)
Field Winding Tests:  The following
tests  can  be  performed  without
disassembling the generator, but the
field  coil  leads  must  all  be
disconnected from their terminal points;
brush rig, control box, and external
connections.  If a defective coil is
found, disassemble the generator and
replace the defective coil.
(10) With an ohmmeter or continuity lamp, check for grounding to the generator frame. Touch one prod
to the coil terminals and the other to a clean, paint-free part of the frame. If grounding is indicated,
separate the windings and check each one.
5-367

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc.
6230 Stone Rd, Unit Q Port Richey, FL 34668

Phone For Parts Inquiries: (727) 493-0744
Google +