Structure and functions
15
Building Technologies
048_DMS_NK8237_ICC_MP4.40_A6V10316241_a_en.doc
Fire Safety & Security Products
06.2011
X102 onboard inputs
Pin Signal
Circuit 1
(internal power supply)
Circuit 2
(external power supply)
1 Input
1
(Mains failure)
2 Input
2
(Battery fault)
3
Input 3 (Power
supply fault)
4 Common
5 +
Val
6 -
Val
4.1.6
I
2
C interface: DF8090 power supply supervision
The I
2
C interface (X11) allows for a direct support of:
Power supply supervision: one DF8090 power supply supervision module.
The module can be installed on the DIN-rail, next to NK823x unit.
Although it can be supported, the DF8090 is not frequently used in the NK8237
installations, which typically rely on the fire system power supply and the related
supervision, whose signals are acquired on the X102 onboard inputs.
Note also that the DF8090 signals are not reported on the Modbus interface.
DF8090 Power supply supervision
DF8090 is a module designed for monitoring a 12V DC power supply. It can detect
the conditions listed below, shown on the DF8090 local panel (see Fig. 6) and re-
port them to NK823x, and in turn to management station (see the following):
Mains failure (no 220VAC)
Battery
low
Power supply failure (trouble with AC/DC converter)
Battery protection fuse blown (internal micro-fuse type MSF 3.15A/250V)
Fig. 6 DF8090 front panel
See Fig. 10 at p.18 for the NK823x power supply connections.
9
8
7
6
5
4
3
2
1
1
DF8090
PW
MAINS
AC/DC
LOW
I
2
C connector
to I/O modules
LEDs
BATT FUSE
