Installation; Battery Jumper Setting - Bosch PLN-24CH12 Installation And Operation Manual

16 en | Installation
5

Installation

Before installing the battery charger into the 19" rack, the battery jumper setting must be
carried out.
5.1

Battery jumper setting

The battery charger takes every 4 hours a resistance measurement (Ri) of the battery
including connections and battery fuse if the total output current (main plus auxiliary) is
<12 A.
For each battery charger type a jumper is located at the daughter board to set trigger
thresholds for the resistance and allowed discharge current.
Figure 5.1 Location of the battery jumper of the PLN-24CH12 (similar location for the PRS-48CH12)
Jumper setting
75 (factory default) 24 Vdc
50
The jumper is set on the '75' position as factory setting. Any other position of the jumper is
equal to the '50' position.
Exceeding the Ri thresholds is signalled as a battery fault (see section 3.4.1 ) and means that
the battery charger with its associated battery will not have the required back-up duration in
case of mains failure.
To avoid initiating this fault, take care of the following:
–
–
–
–
–
180110011Aa | V1.1 | 2011.05
Voltage
48 Vdc
24 Vdc
48 Vdc
Use authorized batteries (see Section 7 Configuration).
Use short battery cables with a diameter as large as possible (35 mm² max.):
– For a cross-section of 10 mm², the resistance is 2 mΩ/m
– For a cross-section of 16 mm², the resistance is 1.25 mΩ/m
– For a cross-section of 25 mm², the resistance is 0.8 mΩ/m
– For a cross-section of 35 mm², the resistance is 0.6 mΩ/m.
Example: for battery cables (+ and -) 1.5 m in length and with a cross-section of 10 mm²,
the resistance is 6 mΩ.
The connections should be realized properly in order to generate as low resistance as
possible.
An additional battery fuse will add about 1 to 2 mΩ.
Installation and Operation manual
Threshold (Ri) Battery capacity
13 mΩ±10% 86 to 225 Ah
26mΩ±10% 86 to 225 Ah
20mΩ±10% 65 to 225 Ah
40mΩ±10% 65 to 225 Ah
Battery Charger
Max. allowed
discharge current
150 A
150 A
100 A
100 A
Bosch Security Systems B.V.