Service manual

5. References
5-1
5.1 Generator’s Winding Wires Resistance Value
［At the Temperature of 68°F(20°C)］
SDG25S
-6A7
SDG45S
-6A6
SDG65S
-6A6
SDG100S
-6A6
SDG125S
-6A6
SDG150S
-6A6
Voltage selection
switch position
480/277V
Ω
0.921
(T1–T2)
(T2–T3)
(T3–T1)
0.374
(T1–T2)
(T2–T3)
(T3–T1)
0.233
(T1–T2)
(T2–T3)
(T3–T1)
0.114
(T1–T2)
(T2–T3)
(T3–T1)
0.088
(T1–T2)
(T2–T3)
(T3–T1)
0.069
(T1–T2)
(T2–T3)
(T3–T1)
Generator
armature
winding
wires
−
Ω
0.23
(T1–T4)
(T7–T10)
(T2–T5)
(T8–T11)
(T3–T6)
(T9–T12)
0.094
(T1–T4)
(T7–T10)
(T2–T5)
(T8–T11)
(T3–T6)
(T9–T12)
0.058
(T1–T4)
(T7–T10)
(T2–T5)
(T8–T11)
(T3–T6)
(T9–T12)
0.029
(T1–T4)
(T7–T10)
(T2–T5)
(T8–T11)
(T3–T6)
(T9–T12)
0.022
(T1–T4)
(T7–T10)
(T2–T5)
(T8–T11)
(T3–T6)
(T9–T12)
0.017
(T1–T4)
(T7–T10)
(T2–T5)
(T8–T11)
(T3–T6)
(T7–T12)
Generator field winding wires
Ω
2.293 2.378 3.024 2.219 2.72 1.62
Exciter armature winding
wires
Ω
0.522 0.522 0.571 0.415 0.44 0.18
Exciter field winding wires
Ω
17.652 17.65 16.353 19.375 21.3 14.3
Auxiliary winding wires
Ω
2.07 1.54 1.34 1.15
←
1.0
5.2 Forced Excitation Method
1. Run the generator at the rated r.p.m.
2. Disconnect the field connector in the control panel,
and apply the battery voltage to the exciter winding
wire.
J and (+) terminal of battery
K and (-) terminal of battery
3. Magnetize for 1 to 2 seconds, then remove the wires
and check if voltage is generated.
Note: Thickness of lead wires between battery terminal and connector should be the same
thickness as exciter field winding wires (J and K wires). It is dangerous that the wire
may be overheating, if the wire is too small in thickness.
Generated voltage from forced excitation (at 480V) (V)
Voltage generated (V) [at the temperature of 104°F(40℃)]
Battery 12V Battery 24V
SDG25S-6A7 440 570
SDG45S-6A6 450 575
SDG65S-6A6 450 575
SDG100S-6A6 405 550
SDG125S-6A6 400 555
SDG150S-6A6 515 595
* The generating voltage is only for reference because it will change due to the ambient
temperature.
SG06022
KJ