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c. Press and release the NO WELD key.
d. Release the FAULT RESET key.
e. "SCH" will be displayed for 2 seconds and the
successive schedules will be aborted.
If Successive schedules was programmed 0, then the CHAIN
SCHED instruction (if programmed non-zero) will cause a
"branch" to the VALVE instruction of the schedule that is
programmed. Chaining schedules is used to control multiple
guns, clamps and other solenoids in uninterrupted cascade
fashion.
The four different valves may be controlled by using a
different BINARY VALVE output pattern at the VALVE
instruction of each new schedule of a chain. After the output
of a binary valve pattern, program 0 in the WELD functions
and/or obtain proper delay timing in the SQUEEZE or
HOLD function. All 60 sequences are available for Successive
or Chain Schedule use.
To avoid endless loops, a schedule may be programmed only
once in a successive chain of events. Successive (interrupted)
and Chaining (non-interrupted) may be mixed to provide the
desired control pattern. Binary valves may be used as many
times as necessary in both. Use Figure 4
to assign up to 4
functions to the SV outputs. The table will help select the
proper binary number for each schedule in a chain. Choose
the valve output pattern necessary and mark the schedule
number in the table for that step. Fore more information,
refer to“Binary Valve/Function Table” on page 9-47.
A critical issue that must be addressed when chaining is
safety relay K7. The relay contacts prevent outputting unless
a schedule has been piloted (i. e., hands on the pilot). K7 is
first energized by the pilot and then "latched" in by a SV
valve output. If binary 0 is output during a chain, the latch
will be lost and K7 will open valves SV1 – 4 for the remaining
events. Use jumpers JW1, JW2 and JW3 to jumper the K7
safety contacts. Consider removing this safety feature VERY
CAREFULLY, or not at all.
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