本帖最后由 td456 于 2010-2-21 17:29 编辑 ( h2 I$ S/ X4 K1 F: ~0 N
& M+ k7 W: ?# }! ]9 o9 t- k$ j
When open a motor connection box, / e+ v: V) Y4 a* T9 ~Beside three phase wires for the power,. w. \6 t0 q7 v. ^* Z
We have another two wires marked as P1 and P2 " _& v' o4 M6 [# y4 l( CWhat is that for(P1, P2)? : Q& c1 E( \5 W: ~Most of the time, they are not used.* f, h. ~! ]$ z8 [5 d* r& t8 W
Good question! / @* b0 X! r" l1 V- X# x4 ^ ~/ g( b: v8 E
I think the two leads P1 and P2 are for the thermal switch (mostly normal close), use multimeter to check out.; H3 ]- e" f$ {" m