Explorer FX15 - Page 35

FX15 Controller Technical Bulletin
35
Connecting Active Sensors Powered by 24 VAC
The FX15 can accept active temperature, pressure, flow, and humidity
sensors providing 0-10 V or current signals powered by 24 VAC.
A second transformer (24 VAC/24 VAC, 3 VA maximum) powering
only the Analog Input is required in order to maintain the insulation
from the microprocessor.
32 33 34 35
939291
FX16
220Vac24 Vac
24 Vac
24 Vac
24V
V ~ Hot
V ~ Com
Earth
24V
123
AGND
AI1
EXT V
45
AGND
AI2
67
AGND
AI3
8
EXT V
Active Sensor powered at 24 V
3 VA max
FX15
15 V
A
Figure 35: Active Sensor powered at 24 VAC Connection Diagram
Table 6: Active Sensors Powered by 24 VAC
FX15 Terminals Sensor Cable Description
AGND (1)
Green Common Reference
AI1 (2)
White Signal Output
Note: The numbers between the brackets are the FX15 terminal
numbers.
IMPORTANT: Not powering the Analog Input with a second transformer or
powering the AI with the power supply on another FX controller, will result in a
short circuit causing the failure of the FX15.