make, model number, date of manufacture,
a nominal 300 amperes at 32 volts while operating at 60
serial number, and the Federal stock
percent duty cycle. The ac motor is controlled and
number of the welding machine.
It is
protected by a magnetic across the-line contactor that is
located on the welder housing.
operated by a pushbutton on the control panel. This
(2)
The main name plate specifies the name of
starter incorporates an automatic reset thermal-overload
the manufacturer, serial number, model
relay. This relay protects the welding machine against
number,
manufacturer's
specification
severe and continuous overloads, low line voltage,
number, ampere rating, volts, duty cycle,
stalled single-phase conditions, and locked rotor
rpm (revolutions per minute) and control
conditions. The thermal-overload relay automatically
instructions. It is located on the control
resets when the motor returns to a safe temperature and
panel.
no manual operations are required to restart the
(3)
The instruction nameplate specifies detail
machine except pushing the start button.
operating instructions and is located on the
c. Control Panel. The control panel (fig. 3)
machine housing near the control panel.
contains all the switches and indicators necessary for
(4)
The wiring diagram plate is a reproduction
the operation of the unit. Included in this group are the
of the electrical wiring diagram of the
reversing switch, rheostat current selector, electrode
welding machine and is located on the
selector, stop-start switch, current voltmeter and
underside of the front cover.
b. Tabulated Data.
4. Identification and Tabulated Data
a. Identification. The welding machine has four
Manufacturer ............................ Harnischfeger-P & H
major identification plates. The information contained
Model ........................................ W300MG
on these plates is listed below.
Type ........................................ ac with dc Output
(1) The Corps of Engineers identification plate
Speed ...................................... 3,500 rpm
specifies the name of the manufacturer,
Figure 3. Control panel.
AGO 8244A
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