SECTION 3
PCM-875A Mechanized Plasma Cutting System
Installation
3-4
WARNING
!
Failure to connect chassis to an
approved electrical ground may
result in electrical shock, severe
burns or death.
The chassis must be connected to an
approved electrical ground.
Console Power Lead
The PCM-875A power console is internally wired for
connecting to an external power source.
3.2.5 Connection of Plasma Console To CNC Interface
Arc On S
igna
l
Relay
Closing
St
art
S
igna
l
Relay
Closing
20:
1 (
+
)
Vo
lt
ag
e
Divider
Not Used
1
2
3
4
5
6
7
The CNC interface (TB4) is mounted on the
front left corner of the console base.
·
Arc On Signal – This signal originates in the
plasma console. It is a normally open contact,
which closes on main arc transfer. Used to
activate machine motion and arc voltage
control.
·
Start Signal – Signal is derived from CNC
machine. It is a normally open contact, which
closes starting the plasma sequence. The
system is off when this contact closure is
removed.
·
20:1 (+) Voltage Divider – The voltage divider
provides a signal ouput, which is proportional to
the cutting voltage. Signal reduction is 20 to 1
and controls whether the torch is raised or
lowered in reference to the work piece. This is
referred to torch to work distance. This
distance is adjustable by varying arc voltage
reference voltage.
·
Not Used
