Vaisala HUMICAP HMW90 SERIES Guide de l'utilisateur Page 25

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Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 23
Wiring HMW93
Recommended wiring for long cables:
-T -Vs+T +Vs
Power supply
18 ... 35 VDC
or 24 VAC ±20%
R
L
=10k min.
-RH +RH
V
V
Relay
max. 50 VDC
500 mA
1111-068
Figure 11 Wiring HMW93
3-wire connection with -Vs as common ground. Maximum cable
resistance is 2.5 (24V supply, 0 ... 10 V output, relay not used).
-T -Vs+T +Vs
Power supply
18 ... 35 VDC
or 24 VAC ±20%
R
L
=10k min.
-RH +RH
V
V
Relay
1111-069
Figure 12 Three-Wire Wiring for HMW93
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 13 below.
+Vs OUT
-Vs
+Vs OUT
-Vs GND
Shared
common
line
HMW93
HMW93
CONTROLLER
24 VAC
Supply
voltage
Supply
voltage
Signal
output
Signal
output
GND
1112-026
Figure 13 Connecting a Common AC Power Supply
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