Pressure X2 - Bosch WT PSI 6 Series Technical Information

Electrical connection
7.1.2

Pressure X2

Pressure output
Pressure input
7-4
For cable type and maximum cable length, please refer to the table "Cables", see sec-
tion 5.
The connection between PSI 6XXX.190 W1 and the pressure control valve consists of a
shielded cable. The shield is connected to X2/5 and the shield ground at the pressure
control valve.
Depending on the programming and timer type used, an output signal is provided at the
pressure output if the program number has been selected:
- analog pressure output, voltage from 0 V to +10 VDC, max. 20 mA
The pressure output is immediately driven when the program has been selected exter-
nally.
A +24 signal (20 mA) at input X2/4 serves as an input to the WT by which an external force
and comparison device signals that the specified pressure/force value has been reached
at the electrodes. This <Pressure input> signal is linked by a logic AND with the <Moni-
toring contact> in the WT and acts together with it as a condition for Start of the SQZ.
When operated without this external force measuring and comparison device (without
pressure control valve), input X2/4 has to be permanently supplied with a +24V signal,
and terminal X2/2 has to be connected to the 0 V potential of the 24 VDC supply.
The logic condition of the pressure input can be checked using Operation - Diagnostics
I/Os- Inputs (I08).
While the PSI 6XXX.190 W1 waits for the pressure input, selecting Operation - Diagnos-
tics - Timer will show Status: Waiting for pressure contact in the Current sequence - In-
terval: SQZ display field.
PSI 6XXX.190 W1
1070 080 086-101 (01.01) GB