Bosch Rexroth PSI 6 326 Serie Typspezifische Anleitung Seite 40

40/46 Bosch Rexroth AG
Features
activates the "Dressing tool on" output and waits until the dressing tool has
started running. As soon as it detects a rising edge at the "rpm sensor" input, it
will set the "Dressing tool running" output to high status. As soon as this signal
is high, the timer starts counting the revolutions. When the programmed rpm
has been reached, it will set the "Dressing tool finished message" output to high
state. The dressing tool will continue to be driven until the "Start dressing tool"
input becomes low; then, outputs "Dressing tool on", "Dressing tool running"
and "Dressing tool finished message" will also be reset to 0.
If an error occurs during tip dressing (tripping or 0V of the "Temperature contact
dressing tool" or "Motor protection trip", Emergency-Stop, failure of the rpm
sensor, i.e. no rising edge for 500 ms, dressing tool activated for more than
10s or tip dressing cancelled by deactivating inputs "Start dressing tool" or
"Close gun" before the programmed rpm are reached), the dressing tool is
immediately stopped, a fault message is generated and output "Error dressing
tool" becomes high (1).
 If 0 dressing tool revolutions have been programmed, the timer will immediately
set the "Dressing tool finished message" output to 1 without setting the
"Dressing tool on" output.
 This timer is capable of controlling 2 dressing tools (not at the same time!). The
"Temperature contact" and "Motor protection trip" inputs are used for both
dressing tools.
The number of dressing tool revolutions is derived from the parameters of the
electrode number which has been assigned to the currently activated program,
no matter which dressing tool is started.
Two different upper limits may be programmed with respect to the dressing tool
revolutions per electrode. One upper limit each applies to "Initial dressing" and
one to "Subsequent dressing". The timer independently selects the appropriate
limit value subject to the relevant electrode status (initial dressing of a new
electrode, normal dressing of a used electrode).
 Monitoring the Tip Dressing result
The weld timer monitors the tip dressing result on the basis of the heat value
and the current as follows, using the routine described below:
The user defines a welding program for tip dress monitoring. This program is
then used to perform the reference welds and the monitoring welds. In this
program, a schedule in "PHA" mode should be programmed for the second
weld time without stepping and without %I compensation. The electrode to be
monitored must be assigned to this program. In this program, the hold time
must be at least 20ms, and the "Weld Complete" contact output must not
become high before the end of the hold time. This is necessary in order to
ensure that the output that indicates a defective weld safely becomes high prior
to "Weld Complete". The warning that is generated from a "not OK" checking
result will be reset by the start for the next spot weld of the same electrode. For
more information, refer to detailed specification of "Monitoring the electrode
dressing result".
The warning that is generated from a "not OK" checking result will be reset by
the start for the next spot weld of the same electrode.
For more information, refer to detailed specification of "Monitoring the electrode
dressing result"
R911332442 | PSI 6xxx.326