Backup power supply CP-1004, the PS2-60/27 source

Fig. 1 An example of a backup power supply of the CP-1004 basic module

Notes:

1. The power supply must be stabilized 27.2 VDC, complying with SELV requirements, and it must be designated for charging the connected batteries; as a standard it is recommended to use the PS2-60/27.

2. The batteries are sealed 12 V lead-acid type (2 pcs connected in series) with a capacity of 1.3 to 17 Ah (depending on the requirements for backup time and the power consumption of the assembly).

3. The battery lifetime is approx. 3-4 years, but it decreases significantly with increasing ambient temperature, so it is advisable to place the batteries in a cooler location. It should be placed in the lowest possible location in the distribution cabinet (e.g. on the bottom of the housing).