Generac Power Systems TXP - Manual (Page 42)

TEST 38 -
MAIN CIRCUIT BREAKER
NOTE
If the alternator has. been re.eonnected to provide a dual voltage
of 120 and 240 volts, the Main Circuit Breaker will be disconnec­
ted from the circuit. See WIRING DIAGRAMS, Section 2.
A.) Disconnect wires from Main
Circuit Breaker terminals ”A" and
”B", to prevent interaction. Set
VOM to "-)-DC" and to "Rxl" scale.
Zero the meter. Connect one meter
test probe to Terminal ”A" and
one probe to Terminal . ”B’.', With
the Circuit Breaker ON, meter
needle should swing upscale and
indicate ZERO ohms. With Breaker
OFF, meter needle, should drop all
the way downscale to !.'Infinity”,
TEST 39 -
ROTOR
A.) Use a ^ inch nut driver to re­
move the No. 8-32 screw that reta­
ins the Brush Inspection Cover to
the Rear Bearing Carrier. Remove
the Brush Inspection Cover, Set a
VOM to "Rxl" scale and to "+DC".
Zero the meter. Connect one meter
test probe to the brush terminal
furthest from the Brush Inspection
Cover opening. Connect the . s.e-cond
test probe to Ground, Meter needle
should swing upscale and indicate
approximately 13 Ohms. (+10 %). •
■ RESULTS: 1.) Tests Good...,,..............................
2.) Tests Bad,
.Continue tests in "Diagnostic
Flow Charts", Section 3
.Go to Paragraph "B"
B.) Use a
\
inch nut. driver to re­
move the Brush terminal screws, as
well as the Brush Holder reta.Lning
screws. With VOM set to. "+DG" and
to "Rxl" scale, repeat the test of
Paragraph "A" directl.y on the Rotor
Slip Rings, Meter needle should, swing
upscale and indicate, approximately 13
Ohms (+ 10%).
Issued 6-78 4.21