PT2001-A1 and PT2002-A1 redundant power supply

1

Cerberus PACE Compact cabinet

2

External 'Desk call station (19 buttons)' PT2001-A1 with accessories or 'Fire brigade call station (AT)' PT2002-A1

3

'MeanWell SD-50B-24 DC/DC Converter (50W)' PCA2011-A1 or 'MeanWell SD-100B-24 DC/DC Converter (100W)' PCA2018-A1

4

'Ground fault monitoring (24V)' PCA2001-A1

5

Fuse holder with fuse 1 A

6

'Call station interface (redundant)' PTO2009-A1

7

24 V wiring to 'Desk call station (19 buttons)' PT2001-A1 or 'Fire brigade call station (AT)' PT2002-A1

PCA2011-A1 and PCA2018-A1 (3) provide isolated DC 24 V. A short circuit outside of the cabinet has no impact on the signals in the cabinet.

The PCA2001-A1 (4) detects a ground fault on the 24 V wiring to PT2001-A1 and PT2002-A1.

Each 24 V wiring (7) to PT2001-A1 and PT2002-A1 is installed with an additional 1 A fuse (5). It ensures that a short circuit on one 24 V wiring has no impact on the other.

The PTO2009-A1 monitors the 24 V wiring to PT2001-A1 and PT2002-A1 and reports a fault. If one 24 V wiring fails, then PTO2009-A1 switches to the other.