Figure 16 Relay Connection: Pwd22 Supplies - Vaisala PWD22 User Manual

User's Guide _______________________________________________________________________
NOTE
52____________________________________________________________________ M210543EN-B
PWC12 board
VB12V
Control 1
DGND
wires: X3-9 or X4-5 PNK
X4-5 VIO
X4-6 GRY/PNK
X4-7 RED/BLU
Figure 16 Relay Connection: PWD22 Supplies
Figure 16 above illustrates external relays connection when relay coils
are powered by PWD22. Voltage pin VB 12 V and relay controls 1, 2,
and 3 are wired by default.
Do not load any of the relay control output pins by more than 35 mA
or any Ext Vb voltage output pin by more than 200 mA.
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 17 on page 53 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.
Cable
Box
X3-9
(X4-5)
X4-6
X4-7
X4-5
X4-8
Relay 1
Relay 2
Relay 3
0309-046