Dc Power Supply - Honeywell Touchpoint Plus Technical Handbook

System Electrical Installation

5.1.2 DC Power Supply

It is possible to power the Touchpoint Plus controller directly from a DC 18 – 32 V supply without using AC supplies at all.
However, batteries used alone may quickly drop below the minimum DC 18 V requirement when under load.
Note: The system must still be connected to protective earth (ground) when using an external DC supply.
5.1.3 Backup Battery Pack
TPPL can be fitted with a rechargeable 24 volt Lithium-Ion Battery Pack. This would normally be charged by the SMPS,
but can be charged by a separate DC 24 – 32 V supply. Charging could take up to 24 hours from a fully discharged state.
Note: The backup battery requires a minimum 24 VDC input to fully charge. However it has a non-replaceable 15 A over-
current protection fuse so the battery input should never exceed 32 V, 5 A.
The battery should be charged at DC 24 – 32 V, 5 A. The backup battery will not become fully charged and the
MAN0984_Iss 3_02/16
Pt. No. 3011M5001_3
Protective
Earth
(Ground)
Figure 18. Connections for DC 24 V Supply
DANGER
DO NOT USE WATER to cool overheated Lithium batteries
as this can cause them to ignite violently or they may even explode.
IMPORTANT
buffer time will be reduced if the charging supply is <24 V.
System Ground Bus Bar
27
Touchpoint Plus
Technical Handbook