7
4.Arc voltage inspection signal: work piece side arc voltage inspection signal input
（
）
terminal
，
connect with arc
voltage inspection cable from work piece side
（2）
（1）
（3）
（4）
4.3
Back panel instruction
（
1
）
Power switch: over current protection switch, when machine abnormal, this switch will power off to protect the
machine. Please separately connect power switch when install the machine
（
2
）
Communication plug X1: power source parallel control connecter or synchronize control communication plug, input
plug
（
）
. Pin 1 is for whole communication signal A, pin 2 is for whole communication signal B, other 5 pin is for
reservation.
（
3
）
Communication plug X2: power source parallel control connecter or synchronize control communication plug, input
plug
（
）
. Pin 1 is for whole communication signal A, pin 2 is for whole communication signal B, other 5 pin is for
reservation.
（
4
）
Fuse FU1
（
5A
）
: used for control transformer over current protection(control circuit, fan, remote control output)
（
）
.Make sure the power source is no electricity when turn on the fuse.
（
5
）
Power cable connector: three phase power input
（
）
；
（
6
）
Ground connect
（
）
screw
（
M8
）
: must be stable and fit the state standard
（
7
）
Cable fix block: to fix the three phase input cable