Bosch Rexroth PST 6 0 Series, Operating Instructions Manual

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1070080029 / 05 Bosch Rexroth AG Electric Drives
and Controls
PST 6xx0 | | 279 /330
Assembly
7.2.14 Transformer temperature monitoring (X3)
For information on whether and how the function is available in your
unit, please refer to the type-specific manual.
Connection: to X3; STKK, grid 3.5 mm, 8-pole,
max. 1.5 mm
2
.
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
2
,
(e.g.: 2 x 2 x 0.75 mm
2
LiYCY,
Order no.: 1070 913 494)
The timer has a temperature monitoring input which ensures protection
of the connected welding transformer.
An excessive temperature is signalled to the timer via a floating contact
that must open if the transformer gets too hot.
In the event of overtemperature (message: transformer temp too high),
the timer will complete a running welding process, while immediately in­
terrupting a seam operation.
A restart is not possible unless the transformer temperature has retur­
ned to values below the critical limit.
The cores for the transformer temperature and the KSR sensor may
be in a common connection line. We offer suitable cables containing
4 cores for this purpose.
X3
3
4
5
D
Shield
Transformer temperature
Shield connection to terminal 3 of X3 only !
Transformer temperature
Welding transformer
Temperature contact
Fig.44: Connection for monitoring the welding transformer temperature
Of course, applications can be implemented involving welding trans­
former monitoring not by the timer, but rather by a PLC.
" You should also make sure that the PLC inhibits additional welding
schedules if the permitted temperature range is exceeded!
If the timer - in spite of an existing monitoring function - is not supposed
to monitor the welding transformer temperature, the following wiring
has to be made:
X3
4
5
Transformer temperature
Transformer temperature
Jumper
Fig.45: Transformer temperature not monitored by timer
ENGLISH