Figure 15 Relay Connection: External Relay Supply - Vaisala PWD22/52 User Manual

USER'S GUIDE____________________________________________________________________
42 __________________________________________________________________ M210543EN-E
If external relays require higher coil current, an external power supply
must be used for one or two of them.
Relay control 3 can be changed to external voltage output of 12 V by
jumper X11.
Figure 15 below illustrates external relays connecting when relay coils
are powered by external voltage. In this case, one of the unused wires
must be changed to ground pin (X4-8, see Appendix B). For example, if
voltage pin X3-9 is not used, the pink wire may be changed to pin X4-8.
The other end of the changed wire must be connected to the ground
potential of the external relay power source.
PWC board
Control 1
DGND
wires: X4-5 VIO
X4-6 GRY/PNK
X4-7 RED/BLU
Figure 15 Relay Connection: External Relay Supply
Cable
+5...12V supply
X4-6
X4-7
X4-5
X4-8
GND (12V)
Box
Relay 1
Relay 2
Relay 3
1008-016