Checking armature for short to earth
•
Measure resistance between slip rings and ar-
mature.
L
Note:
The resistance must be infinitely large.
Measurement result:
Checking resistance between phase outputs
3
•
Check resistance between each pair of outputs.
1 – 2
1 – 3
2 – 3
Nominal resistance: . . . . . . . . . . . . . . . . . . . . . .0,6 Ω
The winding is in perfect working order at measured
values below 1.0
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OL
...................... OL = open line
2
1
Ω
.
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Checking stator winding for short to earth
LT120120
•
Check winding outputs individually with respect
to earth.
L
Note:
The resistance must be infinitely large.
Measurement result: OL = open line.
LT120130
LT120140
12.13