Control Board And Fan Motors - Lincoln Electric TOMAHAWK 375 AIR Service Manual

E-6
CONTROL BOARD AND FAN
MOTORS
The control board is located on the front panel of the
Tomahawk ® 375 Air machine.
board is to house the current setting potentiometer and
three signal LEDʼs. The supply voltages and signals
are communicated between the control board and the
inverter board by a flat ten lead cable.
The different combinations of a steady or blinking LED
provides the user with several conditions of the
machineʼs operation and status.
The steady green LED indicates that the input power is
applied and the machine is on.
The two cooling fans are operated by the input line
voltage and are energized whenever the power switch
is turned on.
THEORY OF OPERATION
FIGURE E.6 - CONTROL BOARD AND FAN MOTORS
045.101.079
The function of this
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
TOMAHAWK
045.101.049
RED LED YELLOW LED
ON OFF
ON ON
OFF ON
OFF BLINKING
BLINKING OFF
® 375 AIR
E-6
MEANING
The cutting torch is
energized.
Torch parts in place
error
The machine is over-
heated and the output
has been disabled.
Input under or over
voltage. Output has
been disabled.
Low air pressure error.
Output has been
disabled.