TCM FB-8 Series, Service Manual

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2. ELECTRICAL PARTS AND PROCEDURES FOR CHECKING
2.2.13 CM CONTACTOR
The CM contactor is used for the on-board battery charger. During charging, 3-phase AC is flowing
through the contactor to open the contact B, thus shutting off the control circuit power supply for the
controllers and other devices. Under normal conditions, it opens the 3-phase contacts to prevent the
charge current from flowing.
Applicable truck
model
CM contactor
Thermal relay
setting
Input voltage
Thermal relay
setting range
FB10-8
FB15-8
FB18-8
281E2-62661 13A
3 ø 50/60Hz 380/390 V
430/440 V
9 to 13 A
FB20-8
FB25-8
281E2-62651 18A 12 to 18 A
FB25-8LB
FB25-8V
FB30-8
FB30-8V
FB35-8S
281U2-62661 26A 18 to 26 A
Checking procedure
(1) Checking coil resistance
Measure the resistance between points “a” and “b”.
The resistance should be 0.1 to 0.3 kΩ.
(2) Checking for continuity of contact B
Measure the resistance between points “c” and “d”.
There should be no continuity while the button “e” at the center
is being pressed.
Coil
3-phase AC
Contact B