Bosch Rexroth PST 6 0 Series, Operating Instructions Manual

Page: 275 / 330

1070080029 / 05 Bosch Rexroth AG Electric Drives
and Controls
PST 6xx0 | | 275 /330
Assembly
7.2.12 Electrode force feedback
For information on whether and how the function is available in your
unit, please refer to the type-specific manual.
Connection: to X2; STKK, grid 3.5 mm, 5-pole,
to X9; STKK, grid 3.5 mm, 6-pole,
max. 1.5 mm
2
each.
Mating connectors are comprised in the
delivery.
Cable length: max. 50 m at 0.5 mm
2
max. 100 m at 0.75 mm
2
Cable type: shielded
(e.g.: NFL 13, Metrofunk; LiYCY)
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
No feedback
"
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 instancewhere 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 276.
Feedback to PLC or robot
" 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 instancewhere 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 276.
ENGLISH