FIRECLASS Prescient III
5.2 Standby Battery Requirements
Application, Installation & Commissioning Doc. version 2
33
Float Charge Voltages for Powersonic VRLA batteries:
Fig. 6: Power Supply Connection Details
TB2
SVR1
NTC
J9
+V
GND
B-
L
B+
L
N
Connection to
Control Board
28V
Output
Voltage
Adjust
Negative Temperature Coefficient
Thermistor Input Connector.
Tie wrap to battery lead directly
above battery
240VAC IN
L
E
N
Mains
Terminal
Block
Mounted on
the Enclosure
backbox
Incoming Mains Cable
Secured with a cable tie
Internally Wired
Mains Cable
5A Power
Supply Unit
Mounted on
Chassis
Earth Lead to Earth Bar
Earth Wire to
Chassis
Ambient Temperature
Charger Set voltage Float Charge Voltage
(2x12 V Batteries in series)
-10
o
C (14
o
F)
28.32 V – 28.42 V
27.84 – 28.44 V
0
o
C (32
o
F)
27.82 V – 27.92 V
27.60 – 28.20 V
+10
o
C (50
o
F)
27.45 V – 27.55 V
27.36 – 27.96 V
+20
o
C (68
o
F)
27.20 V – 27.30 V
27.12 – 27.72 V
+25
o
C (77
o
F)
27.10 V – 27.20 V
27.00 – 27.60 V
+30
o
C (86
o
F)
27.03 V – 27.13 V
26.88 – 27.48 V
+40
o
C (104
o
F)
26.91 V – 27.01 V
26.64 – 27.24 V
+50
o
C (122
o
F)
26.84 V – 26.94 V
26.40 – 27.00 V
Table 7: Float Charge Voltages for Powersonic VRLA Batteries
