Bosch Rexroth PST 6 0 Series, Operating Instructions Manual

Page: 269 / 330

1070080029 / 05 Bosch Rexroth AG Electric Drives
and Controls
PST 6xx0 | | 269 /330
Assembly
" You should ensure that the proper functioning of the stop circuit is
always guaranteed!
In the event of dangerous conditions at the welding system or the in­
tentional switch-off of the weld timer, the inputs and outputs of the
I/O array must be set to LOW level. For this purpose, an external
monitoring device must open the floating contact and thus interrupt
the power supply of the I/O module.
If the stop circuit is open, the timer signals "Stop / No 24V". This mes­
sage is self-acknowledging, i.e. it automatically disappears when the
stop circuit is closed.
"
Any external voltage sources used must be designed according to
the principles of "safety separation" in accordance with the Low-Vol­
tage Directive (2006/95/EC).
" If potential separation is necessary between the I/O array and the
timer, the timer and the I/O module must be operated at different
24 V
DC
power supply units!
" The incoming power supply at the I/O module may, if necessary, also
be transmitted to additional units (at the module by internal bridging
at X10).
Please make sure in such cases, that the maximum current load (vol­
tage source, connections) and cable lengths are not exceeded!
7.2.8 24 V
DC
voltage distribution (X4)
Connection: to X4; STKK, grid 3.5 mm, 14-pole,
max. 1.5 mm
2
.
Mating connector is comprised in the delivery.
Cable length: (from power source to the consumer)
max. 10 m at 0.75 mm
2
max. 75 m at 1.5 mm
2
Cable type: unshielded, VDE 0281, 0812 (e.g.: Ölflex)
The internal circuitry connected to X4 ensures easier wiring of the
24 V
DC
supply branches. Different supply options can be implemented
by inserting or removing a few jumpers without modifying the other wi­
ring in the switch cabinet.
For this purpose, the relevant power source is connected to X4/6
(24 V
DC
) and X4/7 (0 V).
4 possible options are described below. The option to be selected
depends on the requirements of your application.
ENGLISH