Burkert Type 8690 - Manual (Page 26)

26
Electrical installation
procedure:
→
Open the Pneumatic Control Unit: unscrewing the transparent
cap in an anticlockwise direction.
→
Install the cable gland, if necessary. Installation instructions see
“1. Appendix - Anhang”
→
Push the cables through the cable gland.
→
Connect the wires.
→
Close the Pneumatic Control Unit.
Screw
terminals
Printed circuit
board 1
2
3
4
5
6
Terminal No.
Fig. 18: Position of the screw terminals
Correct polarity is a prerequisite for the functioning of the
device!
→
Connect only intrinsically safe circuits to terminals 1 – 6.
Connection diagram
with two-wire proximity switches (inductive NAMUR limit switches)
terminal configuration external circuit
1 INI Top +
NAMUR-
Sensor
Explosion
protected area
Non-hazardous
area
+8,2 V DC
0 V
R
1 / 3
2 / 4
3)
2 INI Top -
3 INI Bottom +
4 INI Bottom -
5
Valve control
+
5
6
PA
Explosion
protected area
Non-hazardous
area
+
Safety barrier
4)
6
Valve control
GND
Tab. 7: Connection diagram with two-wire proximity switches
3)
(recommended by NAMUR) Also observe the type-examination
certificate from Turck KEMA 02 ATEX 1090X
4)
Maximum value from barrier see PTB 07 ATEX 2048
english
Type 8690 Ex