How To Use Current Sensors - Bosch Rexroth PSI 6 Serie Betriebsanleitung

1070080028 / 08 | PSI 6xxx
13.3.2

How to Use Current Sensors

Master
Control
module
PSI
X7
Slave 1 X6
Con−
nection
logic
PSI
X7
Slave 2 X6
Con−
nection
logic
PSI
Fig. 95: Master‐slave mode when the primary current sensors integrated in the PSI are used
Some special items must be observed in the master‐slave mode when
actual currents are measured.
Actual currents may only and exclusively be controlled or monitored
1.
by the master! For that reason,
• the slaves must transfer the measurement values of their primary
circuit current sensor to the master; the slaves transfer this infor­
mation via the connection cable at X6;
• secondary circuit current sensors must always be connected to
the toroid‐input of the master (X3, terminals 1 and 2; see page
377).
The position and number of the current sensors in the secondary cir­
2.
cuit are dependent on each other! Observe the following:
• If only one current sensor is used in the secondary circuit, its mea­
surement value must be proportional to the welding current.
• If several current sensors are used in the secondary circuit, the
total of their measurement values must be proportional with the
welding current. Here, the following applies:
• all sensors must have the same sensitivity,
• all sensors must be connected in series, and
• the output voltages of the sensors must always have the same
sign.
Primary
current
sensor
Power
section
Primary
current
sensor
Power
section
Primary
current
sensor
Power
section
Bosch Rexroth AG
Extension and conversion
PSG
All PSGs are
connected in
parallel.
PSG
PSG
423 / 460
Electrodes