本帖最后由 td456 于 2010-2-21 17:29 编辑 / b3 l7 i: N9 L( J7 b4 S4 I6 x' C1 n* N3 F% O& d9 @+ c
When open a motor connection box, ! h7 L" t+ ^+ K+ b3 J: O. |- {8 ]Beside three phase wires for the power, ) _! U, w; p4 lWe have another two wires marked as P1 and P24 F, t/ a* ^) E
What is that for(P1, P2)? 7 }# X" | F' A" X% N5 kMost of the time, they are not used. & u) r% E) [! f' t) g3 u 7 I- `/ l0 v U! s8 |3 n1 |Thanks!
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Just for temperature monitoring! 8 ?& D, m7 s0 v7 u8 b3 W& M. z2 W$ V( e8 T, l
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Good question!2 T' a7 r3 Q/ ?5 L( H
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I think the two leads P1 and P2 are for the thermal switch (mostly normal close), use multimeter to check out.. y5 b( }8 e& @) z