6
INM F892 Rev 1
The DC power, Alarm and Field Segment connectors are pluggable and available in a
screw terminal version (-xS) or a spring clamp version (-xC). See Figures 5a & 5b. The
terminals can accept the following conductor sizes:
Type
Conductor size
Screw terminals (-PS)
0.14 to 2.5mm
2
Spring clamp terminals (-PC)
0.2 to 2.5mm
2
Figure 5a
- Screw Terminal
Figure 5b
- Spring Terminal
NOTE: When wiring to spring-clamp terminals, use a screwdriver with a 3-4 mm blade
and depress the spring-clamp button before inserting the termination cable. See
Figure 5b.
5 .1 DC Power Requirements
Dual redundant power terminals requiring a nominal input voltage of 24VDC are
provided allowing the use of bulk power supplies with a supply range of 19.2–30VDC.
Input power cabling and over-current protection devices must be chosen to match the
current consumption.
An F892 system, operating with redundant F801 modules at 24VDC, will require 3.5A
in total if all eight segments draw the maximum of 350mA. With redundant F802
modules the system will draw 6A when all segments are loaded to 500mA. Note that
the total current could be drawn from either the Power A or Power B connection if one
power module is removed.
It is also important to size the Bulk Power Supply to handle the inrush current required
by the F801 or F802. Inrush is less than 2 times the maximum rated current for the
F801 with a duration lasting less than 1ms. For the F802, the inrush is less than 4
times the maximum rated current with a duration less than 10ms.
