Flyer

Reliable power supply in all
situations
Application: Emergency lighting with security power supply
In normal operation, a central program checks automatically the operational readiness of the lamps and electronic bal-
lasts of the emergency lamps. Fault status messages are forwarded to the building automation and control system. While
in normal operation the emergency lamps can be included in the automatic general lighting system, faults or failures of
automatic equipment or systems in emergency mode for general lighting, or a DALI power failure, are not allowed to im-
pact security lighting in emergency mode.
In that mode, the security power supply of KNX and DALI and the N 125/x2 power supplies ensure that communication is
maintained: Since emergency power supply delivers the bus voltage, status and error messages can still be sent via bus.
If the N125/x2 is constantly powered by the security power supply, or in the event of a general power supply failure when
changeover to the security power supply takes place within 100 ms, the KNX bus users can also be powered without
interruption should the general power supply fail. For that purpose, the N 125/x2 feature integrated buffering, ensuring
interruption-free changeover.
Application: Security power supply and KNX/DALI gateway with status message in emergency mode
Normal operation
1
2
3
4
6
5
DALI ECG
230 V AC / 220 V DC
230 V AC
Standard power supply Emergency power supply
DALI ECG
DALI
KNX
I202_02046a
■
Lighting control with DALI
■
Feedback of error messages and of failure of lighting and
ballasts to the building automation and control system
■
Monitoring of the number of operating hours for exchang-
ing lamps
Key*
1 Changeover equipment
2 KNX line coupler
3 KNX power supply
4 KNX/DALI gateway
5 Security lamp
6 KNX binary input
*Possible combination of components
Emergency operation
1
2
3
4
6
5
DALI ECG
230 V AC / 220 V DC
230 V AC
Standard power supply Emergency power supply
DALI ECG
DALI
KNX
I202_02047a
■
Parameterization of dim level in emergency mode of DALI
ballasts via KNX/DALI gateway
■
Integrated buffering of KNX power supply ensures interrup-
tion-free changeover to emergency mode
■
Status messages can be forwarded in emergency mode since
KNX and DALI still receive power
Key*
1 hangeover equipment
2 KNX line coupler
3 KNX power supply
4 KNX/DALI gateway
5 Security lamp
6 KNX binary input
*Possible combination of components
PI_Spannungsversorgungen-EN.indd 2PI_Spannungsversorgungen-EN.indd 2 13.08.2012 13:55:4613.08.2012 13:55:46
© Siemens AG 2012
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