Bosch Rexroth PSI 6500 Series - Reducing the Measurement Signal

Electric Drives
and Controls
3-3Bosch Rexroth AGPSI 6500.xxx1070087059 / 02
Electric Connection
X3
1
2
3
4
5
D
Shield
Toroid input
Toroid input
Shield connection to X3 terminal 3 only!
I
1
I
2
I
3
I
tot
= I
1
+ I
2
+ I
3
Connection of several seondary-side current sensors
. If secondary-side welding currents are >120 kA, adjustment mea-
sures must be taken when connecting the sensors!
Observe the instructions in Chapter 3.2.1.
3.2.1 Reducing the Measurement Signal
In the master-slave mode, currents of up to 360 kA can be achieved in
the secondary circuit, if two slaves are used. This cannot be covered by
the voltage range available at the sensor input of the master (greatest
measurement range of the master: up to a maximum of 160 kA).
For that reason, the sensors must be adjusted if currents exceeding 120
kA are required in the secondary circuit.
1 k
2 k
Sensors
X3
1
2
3
4
5
Shield
Toroid input
Toroid input
R
i (PSI)
= 1 k
Adjustment circuit required for secondary circuit currents of >120 kA
Features of the adjustment circuit:
D Divides the signal range by two without changing the terminator of the
sensors
D Reduces the sensitivity of the sensors to approx. 70 mV/kA