Facility Explorer FX16 - Page 54

FX16 Master Controller Technical Bulletin
54
Table 17: Digital Inputs Powered by 24 VAC
FX16 Terminals Description
DI V ~ Hot (35)
24 VAC, Digital Inputs Power Supply
DI V ~ Com (34)
Digital Inputs Power Supply Common
DI8 (33)
Digital Input 8, Voltage-Free contact
DI Com (32)
Common Reference, Voltage-Free contact
Note: The numbers between the brackets are the FX16 terminal
numbers.
IMPORTANT: Not respecting the power supply polarity may result in a short
circuit causing the blowing of the external fuse.
To achieve isolation from the microprocessor circuits and better
immunity against electrical disturbances, use a separate 24 VAC power
supply to power the digital inputs (terminals 34, 35). See Figure 48.
3
2
2
1
2
4
2
3
2
2
3
3
3
4
3
5
9
3
9
2
9
1
FX16
120/230VAC
24VAC
120/230VAC
24VAC
DI1 DI2
DI8
DI V ~ Hot
DI V ~ Com
DICom DICom DICom
24V
V ~ Hot
V ~ Com
Earth
24V
Figure 48: Powering the Digital Inputs Separately
- FX16D and FX16X (Not Rev. A)
3 VA
15 VA