Entron EN1000 series, Installation And Operation Manual

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Figure 7.1 Stepper enabling
7. STEPPER ON EN1000/EN1001 SERIES CONTROLS
Up to five steppers may be programmed on the EN1000 or EN1001 series of weld controls
with PROM P/N 619016-001 revision R or later.
The Weld Stepper may be used for compensate the gradual deformation of a welding
machine's electrodes. This deformation occurs because of the repeated application of heat
and pressure to the relatively soft electrode material, resulting in a broadening of the
electrode face (mushrooming) with continued usage. The increasing face diameter results
in a decreasing current density, which eventually reaches a point where satisfactory welds
can no longer be made. At this time, the weld current setting must be adjusted upwards or
the electrodes must be re-dressed before further use.
The Weld Stepper increases the number of satisfactory welds that can be made without
re-dressing the electrodes, by increasing the welding current in steps as the mushrooming
progresses. This action maintains the current density fairly constant for a relatively large
number of welds. The Stepper can be programmed to change not only the welding current,
but also the weld time, and even the complete welding schedule if desired.
Each of the steppers may have up to maximum ten steps, and each step may be programmed
from 0000 to 9999 welds.
The Stepper can also be programed to provide
an electrical output after the last step to sound
an alarm to alert the operator that the
electrodes need to be re-dressed or replaced.
After end of last step, stepper can be reset
manually or automatically.
The Stepper may be useful when welding
complex multiple spot sequences. On a large
welded assembly for example, several welds
may require a given time and current setting
and then several more welds may require a
different time and current setting, continuing
in this manner through several changes in
welding parameters.
Each of the steppers may also be used as
simple weld count down-counter.
NEW:
In software revision 619016-002P, a new stepper mode has been added, stepper
mode [
=!Z!
]=02, for single stepper counter with multiple steps and any possible
schedule sequence combination.
Stepper counter will be decremented during welding sequence only if weld was made, i.e. weld time and
weld current must be programmed, and control must be in the weld mode (external Weld/No weld
switch, if used, must be closed and front panel Weld/No Weld led indicator must be in weld mode).
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