本帖最后由 td456 于 2010-2-21 17:29 编辑 $ m+ s5 ^1 O+ K1 s 8 U8 F& q# w4 V$ BWhen open a motor connection box, , [0 T2 P/ h: {
Beside three phase wires for the power,5 L5 x# a2 {0 z* g/ I( _* _
We have another two wires marked as P1 and P2* J# L! [* D- z, @6 R
What is that for(P1, P2)?4 l: V( F1 h' K& a
Most of the time, they are not used. 2 {# X7 K2 V, b6 f+ `4 t4 L+ b1 Q% l
Thanks!
Good question! * N8 s* J/ f6 } 4 Q) t7 @# h! hI think the two leads P1 and P2 are for the thermal switch (mostly normal close), use multimeter to check out.) a7 L8 \# v1 O- F( b