Constant Current Regulation Ksr); Fig. 18: Principle Of The Ksr Regulation Mode - Bosch Rexroth PST 6 Serie Betriebsanleitung

1070087088 / 08 | PST 6xxEx

Constant current regulation KSR)

5.3.4.2
Programming:
setpoint current in kA
-
Measured value
preparation
programmable reference
current
(in kA)

Fig. 18: Principle of the KSR regulation mode

Standard case (e.g. robot guns)
Current regulation is activated in KSR mode. For this purpose, the ac­
tual current is scanned by the integrated primary current sensor , con­
verted to secondary current using the transformer ratio and constantly
compared with the programmed current setpoint. A downstream con­
troller processes the setpoint/actual difference and controls the phase
angle in the power unit so that the setpoint current is reached.
KSR features:
• The %I value is programmed in kiloamps kA).
Programmable range: 0.5 to 250 kA
(may be limited by parametrization and the power unit used).
Programming resolution: 10 A
• The current flowing through the parts to be welded is regulated.
• Eliminates the influence of the electrical resistance in the secondary
circuit on the weld (e.g. transfer resistance between electrode and
part to be welded).
• Only for type PST610E.101: In KSR- mode, the first two half waves
of the first effective weld time will be steered with the
programmed phase angle for this weld time (from FW-Version 103).
Controller
Actual value display
kA actual current
mean phase
angle in SCV
Current monitoring
-Tolerance band
Power integrated primary
system current sensor
Power unit
Actual current value
-Status
-Error
Bosch Rexroth AG 271 / 416
Information on this product
Welding
Electrodes
transformer