本帖最后由 td456 于 2010-2-21 17:29 编辑 7 p- m+ T4 P7 `% R+ o, k / @, s% X6 [+ s: d" h9 G# A2 n$ r: XWhen open a motor connection box, , _ l% l; a( ]& K7 d# YBeside three phase wires for the power, 8 y1 U$ t" p: UWe have another two wires marked as P1 and P2 2 s% Y+ ^ F: w3 s9 xWhat is that for(P1, P2)?* \6 |( X8 ]5 O0 X" T
Most of the time, they are not used.6 q6 @ |9 Y: o* @, X5 |+ F" O
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Thanks!
Good question! . r' e ~2 E e ) d- a$ F5 ?) m. ]I think the two leads P1 and P2 are for the thermal switch (mostly normal close), use multimeter to check out." S1 Z6 i! x! a. r