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THERMAL SWITCHES IN WINDINGS, 3-
PHASE
If either of the three thermal contacts in the winding
is found defect the circuit can be repaired if the defect
thermal contact is bypassed according to the below
scheme. If more than one thermal contact is found de-
fect the stator must be replaced.
Locating defect thermal
switch
No contact
Contact
between
between
1-3
2-3
Defect
thermal
(1-2)
(2-4)
switch
A
(1-4)
(3-4)
3-4
Defect
(1-2)
1-3
thermal
switch
(1-4)
2-4
B
(2-3)
2-4
1-4
Defect
thermal
(2-1)
(1-3)
switch
C
(2-3)
(3-4)
A
Bypass of defect
thermal switch
Con-
Connect
nect
to con-
tactor
1
(A1, A2)
-
2-3
3-4
1-2
-
1-4
3
4
U1
V1
W1
B
C
U2
V2
2
W2
14
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