Tweco HMC-410 - Manual (Page 49)

HMC-410
July 27, 2005 4-7
Software
Dash
Display Feature Description Settings Number
NAR Arc Counter This softswitch enables a mode for the 410 where the 410 ON, OFF 23+
counts the number of 'good' arcs (as defined by the arc current
monitor softswitches IL and IP) while a part is loaded. If the
correct number (or more) of arcs have occurred while the part
is loaded, then when the part is unloaded no errors are shown.
Otherwise, the ERROR relay is closed and the ERROR light
is lit. The correct number of arcs is set in the COUNT window
of the RECYCLE segment.
Here is what's required to setup for this mode:
(1) Integrate the ERROR relay (AUX pins P and R) and the
PART LOADED (REMOTE pins C and E) signal with the
station's logic.
Note that the REMOTE PENDANT START signal will no
longer function as a start signal, and RANDOM SCHEDULE
MODE is no longer possible since this signal has been
redefined as this PART LOADED signal.
(2) Setup desired welding parameters.
(3) Determine the minimum requirements for a good weld and
set those in the arc current monitor softswitches IL and IP.
(4) Set the NAR soft-switch to ON.
(5) The desired number of arcs per part is set into the COUNT
window of the RECYCLE segment.
Note that each SCHEDULE may have a different COUNT, so
that 8 discrete parts with different weld counts are possible.
Here's an operational sequence of events:
(1) The part is loaded by using the REMOTE START signal
as a PART LOADED signal (i.e. shorting the REMOTE
PENDANT amphenol pins C and E is now a PART LOADED
signal).
(2) Each arc that meets the parameters set in the arc current
monitor (IL and IP, if both are 0 then any arc will meet that
criteria) will increment the arc counter. The current number of
good arcs is displayed in the COUNT window of the RECYCLE
segment when the part is loaded.
(3) If the part is UNLOADED (by opening REMOTE pins C
and E) before the desired number of arcs are accumulated,
then the ERROR relay and the ERROR LED is lit. The station
can use the ERROR relay for a variety of purposes (light a
light, turn on an alarm, signal a PLC). The part can be
re-loaded and the weld count continue where it was at when
the part was UNLOADED.
(4) If the part is UNLOADED (by opening remote pins C
and E) with the desired number of arcs accumulated, then the
ERROR relay and ERROR LED do not light, and the weld
counter is reset to 0, ready for the next part to be loaded.