Electrode Force Feedback - Bosch Rexroth PRC 7000 Betriebsanleitung

276 / 334 Bosch Rexroth AG
Assembly
7.2.8

Electrode force feedback

No feedback
Feedback to PLC or robot
For information on whether and how the function is available in your
unit, please refer to the type-specific instructions.
Connection: to XGM3; 10-pole,
2-row.
Mating connectors is comprised in the delivery.
Cable length: max. 50 m at 0.5 mm
max. 100 m at 0.75 mm
Cable type: shielded
Whether or not any sensors are used to feed back the gun condition,
and which ones, depends on the relevant application. The following
alternatives appear to be possible:
• No feedback
• Feedback to PLC or robot
• Feedback to weld timer
" If your plant does not provide a feedback signal, you should make
sure that the parts to be welded are optimally squeezed together be­
fore the beginning of the weld time!
Sufficiently long squeeze times have to be programmed in this case.
If the squeeze time is too short, strong expulsion will be experienced!
This may result in damages to the electrodes and workpiece.
" Ensure by means of suitable parametrization or circuitry that the
timer in systems without feedback signal does not wait for a feed­
back from the process in vain.
Timer types are available for instance where the weld time only
starts after the process has signaled the appropriate condition of the
gun. Refer to Section „Feedback to weld timer" on page 277.
" If the feedback is evaluated by a PLC or a robot, the PLC or robot
must not start the welding program unless the proper gun condition
has been ensured.
If this is the case, the shortest possible SQZ can be programmed in
all welding programs.
" Ensure by means of suitable parametrization or circuitry that the
timer in systems without feedback signal does not wait for a feed­
back from the process in vain.
Timer types are available for instance where the weld time only
starts after the process has signaled the appropriate condition of the
gun. Refer to Section „Feedback to weld timer" on page 277.
PRC7000 | R911172834 / 02
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