Weld Complete Contact (Wc) - Bosch Rexroth PST 6 Serie Betriebsanleitung

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I/O signals for manual gun applications

16.3.10 Weld complete contact (WC)

WC period
Declaration of „Weld without Command" as a warning message
With „Weld without Command" declared as a warning message,
the timer will not stop welding, iif this event appears.
In case of defective thyristors, dangerous continuous currents at
the welding transformer may occur.
" Preferably you should declare „Weld without Command" as an er­
ror message.
" In case of declaring „Weld without Command" as a warning mes­
sage:
Make sure, that the power supply (mains) will be switched off in
case of „Weld without Command" occurs as a result of dangerous
conditions.
The output signal "Weld complete contact" indicates that a program se­
quence has been completed.
This allows the next step of the processing sequence to be initiated.
The logic to generate the WC becomes active
in single‐spot and repeat mode after each spot
1.
seam mode at the end of the seam
2.
after "Set WC" (only possible via BOS)
3.
For how long WC remains set is dependent on the input signal
"Start". Refer to "WC period".
In cases 1. to 2. you have the possibility to make different settings via
parametrization (BOS) for adjustment of the WC to your application:
• automatic output of the WC only after a correct or also after a defec­
tive weld.
• Time when the WC is to be set (refer to "WC start time").
Normally, the timer resets the signal "Weld complete contact" automati­
cally when it detects a negative edge at the input "Start".
However, system statuses may occur in which the signal "Start" has al­
ready been reset prior to setting WC. Triggering after the negative edge
of "Start" is not possible in this case. For this reason, the timer checks if
"Start" is still active when WC is set, and responds as follows:
• "Start" has been set:
WC is only reset with the negative edge of "Start"
• "Start" has not been set: WC is only reset when the parametrized WC
time (BOS; presetting: 1 cycle) has elapsed.
PST 6xxEx |
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