Vaisala HUMICAP HMW90 SERIES - Connecting a Common AC Power Supply to Several Transmitters; Figure 19 Connecting a Common AC Power Supply (HMW93)

User's Guide _______________________________________________________________________
32 ___________________________________________________________________ M211399EN-F
Connecting a Common AC Power Supply
to Several Transmitters
If you are connecting a common 24 VAC power supply to several
transmitters, make sure to connect the same terminal to +Vs and –Vs on
all transmitters. This will avoid a short-circuit through the shared
common line at the controller; see Figure 19 below.
1112-026
Figure 19 Connecting a Common AC Power Supply (HMW93)
+Vs OUT
-Vs
+Vs OUT
-Vs GND
Shared
common
line
HMW93
HMW93
CONTROLLER
24 VAC
Supply
volt
age
Supply
voltage
Signal
output
Signal
output
GND