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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.
IMP. GAL/HR.
1.67
LITERS/HR.
7.57
0.000.00
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