Input For Secondary Current Measurement (X3); Fig. 78: Connecting A Ksr Sensor On The Secondary Side - Bosch Rexroth PSI 6 Serie Betriebsanleitung

1070080028 / 08 | PSI 6xxx
7.2.14

Input for secondary current measurement (X3)

Connection: to X3; STKK, grid 3.5 mm, 8-pole,
max. 1.5 mm
Mating connector is comprised in the delivery.
Cable length: max. 100 m (with recommended cable type)
Cable type: shielded, core area min. 0.75 mm
(e.g.: 2 x 2 x 0.75 mm
Order no.: 1070 913 494)
For the connection of a current sensor, installed in the secondary cir­
cuit.
" On master slave operation:
The external secondary circuit current sensors may only and exclusi­
vely be connected to the master.
PSI units also have an integrated current sensor for the primary cir­
cuit of the welding transformer. This gives you the possibility to
choose between secondary and primary measurement (BOS theme
"Programming", "General" tab, "Current measurement" parameter).
With weld times > 1 s or for temporary suppression in the event of a
sensor failure in the secondary circuit, however, you have to change
over to primary measurement.
The type PSI 6500.190 only provides the "primary" current measure­
ment.
The timers contain an integrated constant-current regulation (KSR).
Using this function, the timer controls the current flow in the secondary
circuit in such a manner that the programmed command current is ac­
tually reached.
In this way, it is possible to compensate for any process- and handling-
induced fluctuations of the secondary circuit resistance.
This regulation requires a sensor that signals the current flown in the
primary or secondary circuit of the welding transformer to the timer.
All PSI units have been prepared for using the UI regulation. A cur­
rent sensor is equally required for using this functionality.
X3
1
Toroid input
2
Toroid input
3
Shield
4
5
Shield connection to terminal 3 of X3 !

Fig. 78: Connecting a KSR sensor on the secondary side

The "Measuring loop check" function is available for the automatic
check of the measuring loop.
Bosch Rexroth AG
2
.
2
LiYCY,
D
377 / 460
Assembly
2
,
Secondary circuit