I 2 C Interface: Df8090 Power Supply Supervision - Siemens NK8237 MP4.40 Installation, Function & Configuration, Commissioning

2
4.1.6 I C interface: DF8090 power supply supervision
Building Technologies
Fire Safety & Security Products
X102 onboard inputs
Pin Signal
Circuit 1
(internal power supply)
1 Input 1
(Mains failure)
2 Input 2
(Battery fault)
3 Input 3 (Power
supply fault)
4 Common
5 + Val
6 - Val
2
The I 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)
LEDs
Fig. 6 DF8090 front panel
 See Fig. 10 at p.18 for the NK823x power supply connections.
Circuit 2
(external power supply)
PW
MAINS
AC/DC
LOW
BATT FUSE
DF8090
1
1 2 3 4 5 6 7 8 9
048_DMS_NK8237_ICC_MP4.40_A6V10316241_a_en.doc
Structure and functions
2
I C connector
to I/O modules
15
06.2011