Bosch Appliances LBB 1965 manual Trigger input connections, 10kΩ, 3.3kΩ

Plena Message Manager Installation and Operating Manual External settings and connections

en 15

3.4 Trigger input connections

Loop through

Supervision

+

Msg Active

Trigger Input

RS232 to LBB1925

Apparatus delivered connected for 230V~

C

24V

NC

C

NO

1

2

3

4

5

6

7

8

9

10

11

12

115V~

230V~ 50/60Hz

NC

NO

LBB 1965/00￿

In

Pilottone

Fault

GND

8900 196 5005

Mains

Trigger Input 1-6

OFF

WK

Out

S/N

Rated Input

ON

Pilot

Message

Warning

Power:50VA

In

Out

1 2 3 4 5 6 7 8

RS232 to PC

To.5L250V

This apparatus must be earthed

Tone

1

10

11

10kΩ

3.3kΩ

17

Figure 3.4

Message sequences or announcements are started with make contacts (17). These make contacts are connected to the trigger input screw terminals (11). The cabling of the first six trigger input contacts (1 through 6) can have supervision by means of a window comparator. Normal operation of these inputs requires two series connected resistors of 10 kOhm and 3.3 kOhm, permanently connected to the far end of the cable connected to each trigger input. Triggering occurs by short-circuiting the 10 kOhm resistor as shown in figure 3.4.

Open or short-circuited cables to such an input result in a fault situation that is detected by the window comparator. The fault indicator LED at the front will light up and the internal fault relay will be unpowered which gives a contact change on the screw terminals (10) at the rear.

Via the dipswitches 1 through 6 at the rear of the unit supervision of each individual trigger input (1 - 6) can be enabled ('ON') or disabled ('OFF'). When disabled these inputs act the same as inputs 7 through 12.

Via dipswitch # 7 it is possible to enable mains failure checking. When enabled ('ON') the fault indicator LED at the front will light up and the internal fault relay will go to the unpowered state upon mains failure, although the unit may continue to work on the 24 Vdc battery.

When disabled ('OFF') switching between mains and battery operation is automatic and will not be noticed.

Via dipswitch # 8 it is possible to switch ON a 20 kHz pilot tone to the output signal for supervision of the cable by connecting equipment. The level of the pilot tone is adjustable (from 'OFF' to -14dB with respect to maximum audio level) via the pilot tone volume control (1). The default volume level is -20 dB.

Bosch Security Systems 2003-09 9922 141 50502en