Bosch Rexroth PSI 6 C 761 Serie Typspezifische Anleitung Seite 71

R911337026 | PSI6xCx.761xx Bosch Rexroth AG 71/89
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).
The Integrated dressing tool control can work in two different modes:
Mode 1 with control by the weld timer
The dressing process is started via the „Start dressing tool X" input. The timer
activates the „Dressing tool on X" output and waits until the dressing tool has
started running. As soon as it detects a rising edge at the „rpm sensor X" input, it
will set the „Dressing tool running X" output to high status. Then, the robot will
close the electrode gun and signal this condition via input „Close gun X". 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 X" output to high state. The dressing tool will continue to be driven until
the „Start dressing tool X" input becomes low; then, outputs „Dressing tool on X",
„Dressing tool running X" and „Dressing tool finished message X" will also be
reset to 0.
If an error occurs during tip dressing ("Motor protection trip", Emergency-Stop,
failure of the rpm sensor, i.e. no rising edge for 500 ms, dressing tool activated
for more than the maximum time or tip dressing canceled by deactivating inputs
„Start dressing tool X" or „Close gun X" before the programmed rpm are reached),
the dressing tool is immediately stopped, a fault message is generated and output
„Error dressing tool X" becomes high (1).
If 0 dressing tool revolutions have been programmed, the timer will immediately
set the „Dressing tool finished message X" output to 1 without setting the
„Dressing tool on X" output.
Mode 2 with external control
The dressing process is started via the „Start dressing tool X" input.: The timer
activates the „Dressing tool on X" output and the „Dressing tool running X" output
to high status. Then, the robot will close the electrode gun and manages the
complete dressing.
The output „Dressing tool on X" is active until the input „Start dressing tool X" gets
low (0).
In that case, the outputs „Dressing tool on X" and „Dressing tool running X" will be
set low (0) again.
If an error occurs during tip dressing ("Motor protection trip", Emergency-Stop,
dressing tool activated for more than the maximum time, the dressing tool is
immediately stopped, a fault message is generated and output „Error dressing
tool X" becomes high (1).
The output "Dressing tool finished message X" is not used in this mode.