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PART TWO - INSTRUCTIONS
T-964C
CAUTION
Do not attempt to weld with the multi
range switch set between two ranges.
Do not adjust the switch under load.
The field rheostat is the small handwheel located to the
switch. (See Pig.
3)
This control is used to make fine
matter in which of the primary ranges the unit is operating.
Turning the field rheostat handwheel clockwise will increase the welding current and
open circuit voltage in very fine steps, while turning the handwheel counter-clock
wise will decrease the welding current and open circuit voltage in very fine steps.
■ C.
FIELD RHEOSTAT -
left
of
the
multi-range
current adjustments, no
d. POLARITY SWITCH - The polarity switch, when provided, is the toggle type,
three position switch located just below the field rheostat. The operation of this
switch reverses the direction of the exciter current through the generator shunt
fields which, in turn, causes the cable connecting terminals to reverse polarity.
When the switch is in *UP* position the welder will operate on straight polarity and
the meter hands (if machine is equipped with factory installed meters) will swing
to the right. When the switch is in the center position it is neutral and the meter
hands will remain at
o.
When the switch is in'DOWN* position the welder will oper
ate on reverse polarity and the meter hands will swing to the left. The use of this
switch makes it unnecessary to change the welding cables from one terminal to the
other when a particular welding job requires a change in polarity of the welding
current.
Multirange switch
Amperes*.
Field
Rheostat
Polarity Swi
Terminal, Electrode
Choke'
Starter"
JSL
m
Voltmeter*
110V. Receptacles
Terminal, Ground
Battery Charging
Ammeter*
Ignition
CONTROL PANEL
(Mainliner Battery Ignition)
Fig. 3
All items are standard on Mainliner.
♦These items are optional on the pipe-
liner.
9
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