16 en | Installation Battery Charger
180110011Aa | V1.1 | 2011.05 Installation and Operation manual Bosch Security Systems B.V.
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)
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:
– 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.
Jumper setting Voltage Threshold (Ri) Battery capacity Max. allowed
discharge current
75 (factory default) 24 Vdc 13 mΩ±10% 86 to 225 Ah 150 A
48 Vdc 26mΩ±10% 86 to 225 Ah 150 A
50 24 Vdc 20mΩ±10% 65 to 225 Ah 100 A
48 Vdc 40mΩ±10% 65 to 225 Ah 100 A
100 75 50 25
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