© Mi bi hi F klif T k 2013 All
© Mi bi hi F klif T k 2013 All i h di h d R i i BR i i B 102 (244)102 (244)
PBV20N2 PBV20N2 Service Service ManualManual
Figure 57. ContactorFigure 57. Contactor
A contactor is an A contactor is an electrically-controlleelectrically-controlled switch used fod switch used for switching a por switching a power circuit, similarwer circuit, similar
to a relay, except with higher current ratings. A contactor is controlled by a circuit, whichto a relay, except with higher current ratings. A contactor is controlled by a circuit, which
has a much lower power level has a much lower power level than the switched circuit.than the switched circuit.
Contactor functionality check:Contactor functionality check:
1. 1. Measure the Measure the ohms ohms between the between the coil A1 coil A1 – – A2 A2 terminalsterminals..
The ohms value should be ~55The ohms value should be ~55
Ω.Ω.
If the ohms value is ~0If the ohms value is ~0 Ω or ~∞Ω or ~∞ΩΩ, replace the contactor., replace the contactor.
2. 2. Measure the Measure the ohms ohms between between the the main main switchinswitching g contacts 1-2.contacts 1-2.
The ohms value should be ~The ohms value should be ~
∞∞
ΩΩ
..
If the value does not match the above, replace the contactor.If the value does not match the above, replace the contactor.
3. 3. Supply +Supply +24 Vdc 24 Vdc between between the A1 the A1 (+) and (+) and A2 (-) termiA2 (-) terminals.nals.
4. 4. Measure bMeasure between thetween the main e main contacts 1 contacts 1 – 2 that – 2 that the contacts the contacts are closedare closed..
If the contacts are not If the contacts are not closed, they are stuck together. In that case, closed, they are stuck together. In that case, replace thereplace the
contactor.contactor.
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