External Weld Stop; Weld On External; Prelift 1; Temperature External - Bosch Rexroth PST 6 Serie Betriebsanleitung

1070087088 / 08 | PST 6xxEx
15.2.5

Weld on external

15.2.6

Prelift 1

15.2.7

Temperature external

Sometimes it is necessary to execute the welding programs without
welding current (e.g. for adjustment/testing purposes).
An external unit (robot, PLC, key switch at the operating panel) can the­
refore specify by means of this input signal
whether the timer should generally execute all welding programs wi­
1.
thout current, or
whether the timer may influence this decision (with or without cur­
2.
rent) on the basis of parameter settings.
Regarding item 1.:
If "Weld on external" is not set, all welding programs in the timer will al­
ways be executed without current - regardless of the remaining pa­
rameters set in the timer. In this case, the power unit will not be
operated.
Regarding item 2.:
If "Weld on external" is set, the response depends on the following pa­
rameters:
• Weld on internal (acts globally on all programs in the timer) and
• program‐related weld on (is part of each welding program and is only
effective in the respective program).
The execution of a welding program with current is only possible if
• "Weld on external" and
• Weld on internal and
• the program‐related weld on are activated.
Effects the setting of the output signal "Prelift 1" (refer to page 369), as
long as the input is HIGH.
"Prelift 1" is interlocked against "Start 1".
Serves for temperature feedback to the weld timer. The following app­
lies:
• High level: Temperature ok
• Low level: Temperature too high
The input is requested directly following the start and during the subse­
quent execution.
If the input signal is missing, the timer will generate the message "Tem­
perature external too high".
Bosch Rexroth AG
I/O signals for machine applications
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