Bosch PST 6101.321 Technical Information page 79

Electrical connection
<Weld complete> (WC)
7-36
PST 6101.321 / PSI 6101.321
If the welding operation of a single spot is properly completed by the end of the last [weld
time], the signal <Weld complete> is output for as long as the <Start_1> signal is true, or
in the case of <Start_1> signal deleted, for a programmed number of mains cycles or
milliseconds.
This signal serves as an acknowledgement for peripheral devices (e.g. robot control).
The <Weld complete> signal takes effect after each weld in single spot mode, in repeat
mode - after every spot. In seam mode the signal reports a faultless weld at the end of the
seam.
Example: With Start deleted and with the operation modes Single, Repeat and
Seam, WC start 1 cycle before HLD end, WC Period according to programming
Start
WLD
Example: with pending start and operation mode Single, HLD time
WLD
Figure 28: Example on Programming of the Weld complete contact WC
"Quick robot communication"
For example, if the <Weld complete> contact (WC) serves as start signal for the welding
robot, delays in signal processing by the robot and its drives can be accounted for by pro-
gramming a negative value for the WC.
In order to avoid these delays at least in part, WC start can be postponed to the hold time
(HLD).
HLD = 3 cycles
1 2
- value
3 cycles, WC start with HLD end.
Start
HLD = 3 cycles
1 2
- value
3
+ value
WC period
3
+ value
WC period
1070 080 056-101 (99.09) GB
t
t
t
t
t
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