Tip Change Request; Freely Programmable Output; Main Switch Release - Bosch Rexroth PST 6 Serie Betriebsanleitung

1070087088 / 08 | PST 6xxEx
16.3.7

Tip change request 1 / 2

16.3.8

Freely programmable output

16.3.9

Main switch release

The timer uses the output signal "Tip change request" to indicate that
• an electrode change has to be performed "soon"
(intermittent output signal, warning)
or
• that the maximum electrode life is reached and an electrode change
is necessary
(continuous output signal).
The time for output of the intermittent signal can be parametrized
(BOS) as wear prior to reaching the maximum electrode life. If tip
dressing is activated, the timer will only output the intermittent signal
when no further dressing is permitted.
Whether further welds are possible after the maximum life is excee­
ded depends on the parametrization of the timer (function "Stop at
end of Stepper").
The output signal is reset by "Acknowledge tip change" (refer to
page 382).
The output serves to control an additional solenoid valve (signal "Sole­
noid valve" refer to page 383) or another peripheral.
This way it is possible, e.g. to generate a counterpressure or a brief
pressure increase.
The temporal sequence of the signal can be influenced through max. 3
freely programmable on/off times.
It can be set earliest with the start of SQZ. The timer forcefully resets the
output at the end of HLD at the latest.
Not available for PST 6xxE.133.
The release of the main switch is provided to ensure system and perso­
nal safety.
The output is cancelled if a voltage is present between the primary cir­
cuit terminals of the welding transformer that has not been initiated by
the timer (message: Weld without Command).
The cause may be e.g. feedback of external voltage initiated by other
equipment, but also defective thyristors.
If main switches with suitable functionality are used, the signal will, if
suitably wired, lead to the automatic release of the main switch and thus
to the switching off of the power supply.
Via BOS the message "Weld without Command" can be declared as
an error (no welding schedule is possible until the error has been re­
set) or alternatively as a warning (welding is still possible).
Bosch Rexroth AG
I/O signals for manual gun applications
385 / 416