Table of Contents
Advertisement
6.1.6
Building Technologies
CPS Fire Safety
Pin
Signal
1
Common
2
NO
3
NC
The input signals can be used for acquiring external power supply supervision
lines, for example, to supervise the fire system power supply. Note that this is an
alternative to the DF8090 power supply supervision (see I2C interface: DF8090
power supply supervision [➙ 21]).
Pin
Signal
1
Input 1 (Mains
failure)
2
Input 2 (Battery fault)
3
Input 3 (Power
supply fault)
4
Common
5
+ Val
6
- Val
I2C interface: DF8090 power supply supervision
The I
C interface (X11) allows for a direct support of:
2
Power supply supervision: one DF8090 power supply supervision module.
The module can be installed on the DIN-rail, next to NK8237 unit.
Note: 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 IEC 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 and report them to
NK8237, and in turn to the 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)
X101 onboard relay output.
Circuit
X101
2
NO
1
3
NC
X102 onboard inputs.
Circuit 1
(internal power supply)
X102
1, 2, 3
4K7
4
100R
5
6
Structure and functions
NK8237 hardware
Circuit 2
(external power supply)
X102
1, 2, 3
4K7
4
100R
5
6
A6V10854379_a_en
30.11.2017
4
21
Advertisement
Table of Contents
