Miller Electric Spectrum Plus, Owner'S Manual

Page: 13 / 44

OM-219 Page 9
SECTION 2 – INSTALLATION
2-1. Specifications
Range
Rated Output
@
110 Volts DC
KW
(Varies With
Output Of
Power Supply)
Type Of Input
(Welding Power
Source/Generator)
Type Of
Output
Maximum
Open-
Circuit
Voltage DC
Plasma
Gas
Plasma Gas
Flow/Pressure
Low
20 To 50 A @
50% Duty Cycle
5.8
Standard 25 ft
(7.6 m) Torch
Cable: 4 CFM
High
35 To 80 A @
50% Duty Cycle
(Input Voltage
Greater Than 60
Volts DC)
9.8
3-Phase Power, 40 To
125 Volts DC; 185
Amperes DC
Maximum
Direct Current,
Straight Polarity
(DCEN)
200
Air Or
Nitrogen
Only
(115 L/min) 70
PSI (483 kPa)
Optional 50 ft
(15.2 m) Machine
Or Torch Cable: 4
CFM (115 L/min)
90 PSI (921 kPa)
2-2. Duty Cycle And Overheating
Duty Cycle is percentage of 10 min-
utes that unit can cut at rated load
without overheating.
If unit overheats, thermostat(s)
opens, output stops, and cooling
fan runs. Wait fifteen minutes for
unit to cool or temperature light to
go off. Reduce amperage or duty
cycle before cutting or gouging.
Y
Exceeding duty cycle can
damage unit and void
warranty.
50% Duty Cycle At 50 Amperes In Low Range;
80 Amperes In High Range
5 Minutes Cutting 5 Minutes Resting
Overheating
0
15
duty1 4/95 – Ref. ST-800 868
Minutes
A
OR
Reduce Duty Cycle