Electrolux EWM09312 Service Manual page 47

1) Check the connection blocks (wiring) and
for the presence of any protruding/kinked
terminals.
2) Check for the presence of any
marks/residue/water or detergent deposits
on the motor an where these come from.
3) Proceed by checking for any
windings/earthed parts or parts with
poor earthing insulation. Use a tester
with a minimum capacity of 40 MΩ:
between each individual terminal and
the motor casing, read ∞ (fig. 10)
4) Proceed by checking each individual
winding according to the following
table (fig. 11).
MOTOR TERMINAL
BOARD
TERMINALS
A 6-7
B 2-5
C 3-4
D 1-5
The tolerance of the resistance of windings is ± 7%
Things to note: when checking the rotor winding, the measurement must be made along the entire profile,
turning the shaft very slowly and checking for the presence of any short circuits between visible blades. Also
check the condition of the brushes.
2012 SOE/DT-mdm FCPD-dp
Guide to diagnostics of EWM09312 electronic controls
How to check collector motors
P = motor protector
R = rotor S = stator
T = tachometric generator
CHECK:
Tachometric generator
winding
Stator winding
(all fields)
Rotor winding
(plus thermal cutout)
Stator winding
(half field, terminal 1
present)
Fig. 10
NMSC
184 Ω
1.1÷2.2 Ω 1.62÷2.12 Ω
1.6÷1.8 Ω 1.9÷2.42 Ω
0.55÷0.56 Ω
47/69
MOTORS
AP&C ECM
68,7 Ω 91Ω
1.46÷1.95 Ω
2÷2.3 Ω
0.67 Ω 0.68 Ω
Fig. 11
599 75 18-74 Rev.00