/ G! c0 n; r1 F8 I1 f/ t% j- X2 W. bWhen open a motor connection box, , [6 T4 Z1 V. h2 X' C8 v" w8 V$ kBeside three phase wires for the power, u. B5 v8 Y8 x8 qWe have another two wires marked as P1 and P2 # A; m* W7 X% xWhat is that for(P1, P2)? 3 K) e, i# B2 l4 }/ hMost of the time, they are not used.+ S' T# q- u) @$ |4 t5 \1 g& {) o
Good question! & N3 \5 @/ ]" l% k" {+ l & r9 Y9 f5 i4 {I think the two leads P1 and P2 are for the thermal switch (mostly normal close), use multimeter to check out.& P* ^" G& p2 t& a0 B