Welding thermal overload protection, B-10, Overcurrent protection – Lincoln Electric POWER MIG SVM170-A User Manual
Page 22: Figure b.5, Temperature protection. (see, Welding thermal, Overload protection, Operation, B-10 welding thermal overload protection
B-10
OPERATION
B-10
WELDING THERMAL OVERLOAD
PROTECTION
The POWER MIG 255C has built-in protective
thermostats that respond to excessive temperature.
They open the wire feed and welder output circuits if
the machine exceeds the maximum safe operating
temperature because of a frequent overload, or high
ambient temperature plus overload. The thermostats
automatically reset when the temperature reaches a
safe operating level and welding and feeding are
allowed again, when gun is retriggered.
OVERCURRENT PROTECTION
The machine will automatically reduce the output if the
load on the machine exceeds 300 to 320 amperes.
This protects the welding power SCR’s from excessive
short circuit currents and from exceeding their
temperature rating before the thermostats can react.
POWER MIG 255C
Note: See inside cover of machine for additional, commonly used welding procedure information.
70
80
90
100
110
120
English Wire
Metric Wire
Length
Part No.
Size
1
Size
12' (3.6 m)
K533-7
.035 – .045"
0.9 – 1.2 mm
15' (4.5 m)
K533-3
FIGURE B.5 — WELDING PROCEDURE INFORMATION