Omni8/16C/Omni8P User Manual
UMC1480R24.pdf
44
© Omniflex 2021
Solution (From Table 4-1):
Table 4-6 – Power Supply Calculations
Model
Max Current
Consumption at
24 Volts dc
C1480
1.1 Amps
C1490
0.6 Amps
Total Current Requirement
1.7 Amps
C1421 Supply capacity
2.2 Amps
Surplus Available
0.5 Amps
The C1490 Omni8C may be powered from the Omni16C unit’s internal supply with still 0.5 Amps at
24Vdc available from terminals C-1 and C-2 for further accessories, such as the audible device.
4.10
Connecting the alarm inputs
4.10.1
With Potential Free Contacts
The Omni8/16C is operated with potential free contacts connected to the input terminals. Each input is
provided with a pair of terminals marked A and B. Terminal A is the alarm input and terminal B is an
independently current limited wetting voltage supplied from the internal 24 Volt supply as shown below.
The standard Input option is 24V common; 0V common is an order option.
Figure 4-6 – Input Connection Diagram using individually wired Potential Free Contacts.
B
A
+24V
Alarm Input
Internal Circuit of
Omni8/16C
Field
Connections
OV
Alarm Input
Internal Circuit of
Omni8/16C
Field
Connections
+24V
0V Common (Optional)
24V Common(STD)
B
A
