本帖最后由 td456 于 2010-2-21 17:29 编辑 $ C! w# c6 [* v
}1 d6 Z7 z6 t6 a
When open a motor connection box, % d$ H* b/ R( c J8 E/ Q7 JBeside three phase wires for the power,* C& I4 D- ?7 _ y- o F
We have another two wires marked as P1 and P2( g0 E7 F# B+ m$ A. }1 F2 f
What is that for(P1, P2)?( O7 Q& c2 M0 r3 m1 N
Most of the time, they are not used.* D6 `: P$ z1 w
Good question!! [7 @: }+ |( A" ~
* t5 c9 R7 r. n- i5 i
I think the two leads P1 and P2 are for the thermal switch (mostly normal close), use multimeter to check out.2 b1 G+ N( o* c* x8 L2 m