8
The memory locations are stored in a system that does not require a battery to energize; therefore, schedules
can be kept indefinitely. When power is applied to the control the Software is loaded into RAM (Random Access
Memory), which is the area where the operating program must reside in order to function. Once the software is
loaded, it is started by an external signal called the RESET pulse. In rare cases, tremendous input power line
surges or spikes, might upset the software causing the program to “glitch”, and by cycling the power OFF and
ON, the software is reloaded and any possible errors are removed.
O P E R A T I O N:
The P280 is industry’s most user friendly welding controller to be found, because that is exactly how it was
designed. Tactile touch means you can feel the key depression by means of a mechanical “thump” sensation.
Program variables are stored in EPROM (No Battery Required) and are called for viewing by depressing
the “B” button. Each depression will advance the program location one position. The WELD Schedule
indicator, when illuminated, notifies the programmer that the number in the window at the top of the panel
is the weld schedule selected for use or observation. This light also indicated the control is in HOME
position and ready to weld.
The dual digit display at the top of the front panel is capable of displaying several different outputs. The
following is a complete listing of displays:
Weld Schedule
00-99
Schedule #
Cool Time
00-99
0 to 1.65 second
Impulses
00-99
Quantity per weld
Up% / Cycle
0.1-9.9
% step each 1/60 second
Up Max %
00-99
% full power
Heat Time
00-99
% of cycles of weld
Heat %
00-99
% of full power
Down % / Cycle
0.1-9.9
% step each 1/60 second
Down Min %
00-99
% full power
Hold Time
00-99
0 to 1.65 second
Off Time
00-99
0 to 1.65 second
Power Up Display
Line Frequency displayed for 1 second
Footswitch Down
88 displayed until released.