Electrical Power Connection and Interfacing
MAN0984_Iss 4_01/19
Touchpoint Plus
Pt. No. 3011M5001
32
Technical Handbook
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.
Connections for DC 24 V 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. It has a
non-replaceable
15 A over-
current protection fuse so the battery input should
never exceed 32 V, 5 A
.
+2
4
V
D
C
In
-V
D
C
R
et
u
rn
Ea
rt
h
(G
ro
u
n
d)
Protective
Earth
(Ground)
System Ground Bus Bar
IMPORTANT
The battery should be charged at
DC 24 32 V
. The backup battery will not become fully charged and the
buffer time will be reduced if the charging supply is <24 V.
DANGER
DO NOT USE WATER
to cool overheated Lithium batteries
as this can cause them to ignite violently or explode.
CAUTION
User shall switch off battery connection switch on the back plane PCB before every battery pack cable
connect and disconnect. Refer to Ch.10.7 Back up Battery Maintenance.