4. fuel consumption, 5. duty cycle and overheating, Duty cycle weld amperes – Hobart Welding Products POWERPAK OM-478 User Manual
Page 15
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OM-478 Page 11
3-4.
Fuel Consumption
The curve shows typical fuel use
under weld or auxiliary power
loads.
ST-188 312
0.00
2.00
U.S. GAL/HR.
IM
P
. GAL/HR.
1.67
LITERS/HR.
7.57
0.00
0.00
0
50
100
150
200
250
300
350
400
450
500
0.76
0.17
0.20
1.51
0.33
0.40
2.27
0.50
0.60
3.03
0.67
0.80
3.79
0.83
1.00
4.54
1.00
1.20
5.30
1.17
1.40
6.06
1.33
1.60
6.81
1.50
1.80
DC WELD AMPERES AT 100% DUTY CYCLE
28 CFM @ 90 PSI
AIR DELIVERY
DELIVERY
W/O AIR
1800 R.P.M.
(NO LOAD)
IDLE
1150 R.P.M.
Continuous Welding
3-5.
Duty Cycle And Overheating
ST-188 311
Duty Cycle is percentage of 10 min-
utes that unit can weld at rated load
without overheating.
Y
Exceeding duty cycle can
damage unit and void
warranty.
100% Duty Cycle At 400 Amperes
10
200
15
20
25
30
40
50 60
80
100
250
300
800
% DUTY CYCLE
WELD AMPERES
W/O AIR DELIVERY
W/28 CFM @ 90 PSI
CONSTANT AIR DELIVERY
400
500
600
700
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