About the CUT voltage divider
The CUT power supplies are equipped with an optional, factory-installed, four-position voltage divider that is
designed to be safely connected without tools. The built-in voltage divider provides a scaled down arc volt-
age of 20:1, 30:1, 40:1, and 50:1 (maximum output of 18 V). An optional receptacle on the rear of the power
supply provides access to the scaled down arc voltage and signals for arc transfer and plasma start.
Note:
The factory presets the voltage divider to 20:1. To change the voltage divider to a different setting, refer to the
section on the next page.
!
The factory-installed internal voltage divider provides a maximum of 18V under open circuit
conditions. This is an impedance-protected functional extra low voltage (ELV)output to prevent
shock, energy, and
fi
re under normal conditions at the machine interface receptacle and
under single fault conditions with the machine interface wiring. The voltage divider is not fault
tolerant and ELV outputs do not comply with safety extra low voltage (SELV) requirements for
direct connection to computer products.
Note:
The cover on the machine interface receptacle prevents dust and moisture from damaging the receptacle
when not in use. This cover should be replaced if damaged or lost.
Installation of the machine interface cable must be performed by a quali
fi
ed service technician. To install a
machine interface cable:
1. Turn OFF the power and disconnect the power cord.
2. Remove the machine interface receptacle’s cover from the rear of the power supply.
3. Connect the machine interface cable to the power supply.
Refer to the following table when connecting the CUT system to a torch height controller or CNC controller
with a machine interface cable.
Setting the
fi
ve-position voltage divider on the CUT
The factory presets the voltage divider to 20:1. To change the voltage divider to a different setting:
1. Turn OFF the power supply and disconnect the power cord.
2. Remove the power supply cover.
3. Locate the voltage divider DIP switches on the left side of the power supply.
Note
: the table below for the shift and scale selection
Dial number
Scale
20:1
30:1
40:1
50:1
1
ON
1
1
1
2
2
ON
2
2
3
3
3
ON
3
4
4
4
4
ON
Signal
Type
Instruction
Pin nr.
Cable end
Start
(start plasma)
Input
Normally open.
18V DC open circuit voltage at START terminals.
Requires dry contact closure to activate.
8, 9
8 (yellow)
9 (green)
Transfer
(start machine
motion)
Output
Normally open. Dry contact closure when the arc transfers.
120V AC/1A maximum at the machine interface relay or
switching device (supplied by the customer).
13, 14
13 (blue)
14 (white)
Ground
Ground
Voltage divider Output CUT: Divided arc signal of 20:1,30:1, 40:1, 50:1 (provides a
maximum of 18 V).
6(+), 7(-)
6(red)
7(black)
1
3
4
5
6
7
2
Gun switch signal connection
Divider output
The large arc signal
connection
The small arc signal
connection
EN-11
