Table of Contents
Advertisement
5. Check the cold resistance of the stator windings by
connecting the meter leads to the stator leads as
shown
in
Figure 8-12.
Specifications for the stator resistance values. If
the stator resistance test is inconclusive, perform a
megohmmeter test on the stator as described in
the next step.
Note: Consider the stator functional if the
resistance reading (continuity) is low and
there is no evidence of shorted windings
(heat discoloration).
Note: When taking an ohmmeter reading using
lead 55, make the connection before the
fuse.
Note: The stator resistance can vary directly with
increased temperature.
If any of the stator readings vary during the previous
checks, replace the stator.
6. Check the stator for a short-to-ground condition
using a megohmmeter.
single-phase megohmmeter connections. Apply
500 volts DC to any stator lead from each winding
and the stator frame. Follow the megohmmeter
manufacturer's
instructions
megohmmeter. Repeat the test on the other leads
until all of the stator windings have been tested. A
reading of 1.5 MOhms and higher indicates the
stator is functional. A reading of less than 1.5
MOhms indicates deterioration of the winding
insulation and possible current flow to ground; if so,
repair or replace the stator.
TP-6359 7/08
See
Section 1,
See Figure 8-13 for
for
using
the
F1
F2
9
F+
AC
AC
AC
8
1. ADC's voltage regulator power supply leads
2. Sensing leads (208--240 volts nominal)
3. Stator windings
4. Main field (rotor)
5. Rectifier module
6. Frame connection
7. Megohmmeter
8. Armature
9. Exciter field
Figure 8-13 Megohmmeter Connections on 1-Phase
Stator
Section 8 Component Testing and Adjustment
1
66
55
3
4
4
F--
5
1
2
6
7
TP-5983-7
2
3
57
Advertisement
Table of Contents
