Bosch Rexroth PSI 6 Series Operating Instructions Manual page 378

378 / 460 Bosch Rexroth AG
Assembly
In order to ensure the proper operation of the sensor, the following
points should be noted:
When installing the sensor, it must be ensured that it is protected
"
against damages resulting from the part to be welded and from ex­
pulsion.
" The place of installation should be selected at the greatest possible
distance from current bus bars and high-current cables. This will re­
duce the noise resulting from external fields. Please also note the
cable specifications provided above.
Do not use any magnetizable metal parts for fastening the current
"
sensor but rather copper or brass.
Make sure that the current conductor is routed through the middle of
"
the sensor in the straightest line possible. The voltage induced in the
sensor (and thus the measured quantity) reaches its maximum if the
conductor runs vertically to the sensor level.
" If the sensor is used on mobile equipment, such as robots, certain
parts of the cable are subject to strong mechanical stress (e.g.
trailing cable).
In these cases, therefore, you should use suitable cables and design
the construction of the connecting lines so as to ensure a quick, trou­
ble-free replacement in the event of a fault.
The cable shield should only be connected to the weld timer!
"
Make sure that the timer's complete control loop is readjusted in re­
"
gular intervals in order to avoid measuring errors (current calibra­
tion). An external reference welding ammeter is required for this
purpose.
" For master slave operation, please also refer to section 13.3 starting
on page 420.
" If secondary-side welding currents are >120 kA, adjustment measu­
res must be taken when connecting the sensors!
Observe the instructions in Chapter 7.2.14.1 on page 379.
PSI 6xxx | 1070080028 / 08