Section 4 − installation, Specifications, Specifications for torch – Miller Electric pmn User Manual
Page 15: Duty cycle and overheating, 1. specifications, 2. specifications for torch, 3. duty cycle and overheating
OM-228 305 Page 11
SECTION 4 − INSTALLATION
4-1.
Specifications
.
If the unit is operated from a 30* ampere, 115 volt circuit or a 15** ampere, 230 volt circuit, a different input power plug must be installed on the
power cord. See Section 4-9 for instructions.
*A 30 ampere branch circuit is recommended for maximum performance. Performance on a 20 ampere branch service may be limited due to the circuit
breaker or line fuse. Reducing unit output amperage will minimize circuit breaker tripping or blowing a line fuse.
**A 15 ampere branch circuit is recommended for maximum performance. Performance on a 10 ampere branch service may be limited due to the circuit
breaker or line fuse. Reducing unit output amperage will minimize circuit breaker tripping or blowing a line fuse.
Amperes Input at
Rated Output,
60 Hz, Single-Phase
Plasma
Rated
Cutting
Rated Output
115 V
(
+
15%)
230 V
(
+
15%)
115 V
KVA/KW
230 V
KVA/KW
Plasma
Gas
Plasma
Gas Flow/
Pressure
Cutting
Capacity
at 10 IPM
Max
OCV
27 A at 92 Volts DC At
35% Duty Cycle
28 max;
0.30*
14 max;
0.13*
3.32 KVA
3.25 KW
3.25 KVA
3.19 KW
Air Or
Nitrogen
Only
4.5 CFM
(129 L/min)
At 60 PSI
(414 kPa)
3/8 in
(10 mm)
288 Volts
DC
*While idling
4-2. Specifications For Torch
Air-cooled torch for plasma arc cutting (PAC)
35% duty cycle
Safety interlock devices shut down power source
Safety trigger guard
Cutting capacity: see Section 4-1
4-3.
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, Temperature
trouble light goes On, 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.
!
Exceeding duty cycle can
damage unit and void
warranty.
Overheating
sduty1 5/95 / 804 486-A
3-1/2 Minutes Cutting
6-1/2 Minutes Resting
35% duty cycle
For Units Connected to a 115 Volt Circuit
or a 230 Volt Circuit:
35% Duty Cycle At 27 amperes, 92 volts dc
0
15
Minutes
A
OR
Reduce Duty Cycle