Electrode Force; Fig. 31: Characteristic For The Output Of Force Values - Bosch Rexroth PST 6 Serie Betriebsanleitung

1070087088 / 08 | PST 6xxEx
5.3.11

Electrode force

The electrode force used to press the parts to be welded together (in
kilonewton: kN) is part of each welding program:
Therefore, the timer generates a corresponding output signal on the ba­
sis of each programmed force value which can be used as manipulated
variable for electrode force.
For the output of the force manipulated value,
• an analog signal at X2U is available. For details, refer to page 322.
The internal characteristic can be created either
• automatically via force calibration (refer to section 5.3.12.1 from
page 289),
or
• manually via parameter "Conversion factor" and "Zero shift".
"Conversion factor" (in kN/volt):
The timer uses this factor to calculate the output value of the force mani­
pulated value. Refer to figure.
"Zero offset" (in kN):
Offsets the zero crossing of the characteristic. Thus the characteristic
can be adjusted to the working zero point of the actuators used. Refer to
figure.
programmed
force in kN
"max. pressure"
-
Zero offset
+
0
"max. pressure": the parameter limits the
max. possible programming of the
electrode force within
program.
Force manipulated value =

Fig. 31: Characteristic for the output of force values

A properly adjusted characteristic is required to make sure that the
programmed force actually has effect on the electrodes!
" In the course of force calibration, the timer automatically calculates
the required values for the parameters "Conversion factor" and "Zero
offset". Therefore, the parameters must not be changed manually
after this!
Bosch Rexroth AG
Information on this product
the welding
progr. force value (in kN) + zero offset (in kN)
conversion factor (in kN/volt)
287 / 416
Force manipulated
value
max. output
force manipulated value
(hardware‐dependent. At
X2 e.g. 10V)