Bosch PLN-24CH12, Installation And Operation Manual

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 m

Ω

/m

–

For a cross-section of 16 mm², the resistance is 1.25 m

Ω

/m

–

For a cross-section of 25 mm², the resistance is 0.8 m

Ω

/m

–

For a cross-section of 35 mm², the resistance is 0.6 m

Ω

/m.

–

Example: for battery cables (+ and -) 1.5 m in length and with a cross-section of 10 mm², 

the resistance is 6 m

Ω

.

–

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 m

Ω

.

Jumper setting

Voltage

Threshold (Ri)

Battery capacity

Max. allowed 

discharge current

75 (factory default) 24 Vdc

13 m

Ω

±10%

86 to 225 Ah

150 A

48 Vdc

26m

Ω

±10%

86 to 225 Ah

150 A

50

24 Vdc

20m

Ω

±10%

65 to 225 Ah

100 A

48 Vdc

40m

Ω

±10%

65 to 225 Ah

100 A

100 75 50 25