User manual

Entravox complete package
28
Service
Measuring points
TwinBus power supply unit 1 7573
TwinBus indoor telephone
Thermal fuses
The power supply unit 1 7573 has two electronic fuses, instead of conventional fuses, which
interrupt the respective power circuit in the case of an overload.
If one of these fuses is tripped, the associated voltage indicator LED in the power supply
unit goes off. Proceed as follows to switch on again:
! Switch mains voltage off and leave off for approximately 1 minute.
! Remedy short circuit or overload.
! Switch mains power supply on again.
The associated voltage indicator LED in the power supply unit is lit again.
Clamp Load Target voltage
a1 b open/switched 24 V DC to 30 V DC
a2 b open/switched 24 V DC to 30 V DC
a3 b open/switched 24 V DC to 30 V DC
1 b no door communication 0 V DC
1 b with door communication 24 V DC
2 b no door communication 30 V DC
2 b with door communication 0 V DC
3 4 without load 11 V AC
Clamp Target voltage
a b 20 V DC to 28 V DC
ED ED
20 V DC to 28 V DC
Entravox_Komplettpaket_8411_de.book Seite 28 Donnerstag, 5. Juni 2008 12:44 12