Testing The Charging Current; Testing The Reverse Battery Protection; Testing The Secondary Voltage (12V/24V) - Bosch BML 2410 Repair Instructions

2.2

Testing the Charging Current

- Connect the charger to the adjustable isolating transformer.
- Connect the charger to a battery.
- Connect a load (e.g. volt-ampere tester) and a voltmeter in
parallel to the battery.
- Set the potentiometer P1 at the charger to minimum.
- Switch on the charger.
- Load the battery until the voltage is 10 ... 11 V.
The charger must display a charging current.
- Increase the charging current to maximum.
With BML 2410 the maximum current is 10A.
With BML 2415 the maximum current is 15A.
The maximum charging current must be displayed.
! To prevent damaging the volt-ampere tester, observe the
information given in the operating instructions regarding the
maximum current, load period and cooling times.
If the current does not flow:
- Disconnect the charger from the isolating transformer and from
the battery.
- Check the charging cable for continuity.
- Check the ammeter V1 for continuity.
- Replace any defective components.
If the charging cable and ammeter V1 are OK and current still
does not flow, the printed board is defective.
If the charging current cannot be controlled:
- Check the potentiometer P1 of the charger.
If the potentiometer is OK, there is a problem with the printed
board.
If the printed board is defective, the charger must be replaced.
2.3

Testing the Reverse Battery Protection

! To prevent damaging the isolating transformer or the measu-
ring instrument, set the output voltage of the isolating trans-
former to 0V
- Connect the charger to the adjustable isolating transformer.
- Connect the black terminal to the positive terminal of the
battery.
- Connect the red terminal to the negative terminal of the battery
via an ammeter (e.g. MMD 302).
- Switch on the charger.
- Slowly increase the voltage at the isolating transformer until it
reaches 230V or until a charging current flows.
The charging current must not flow and the red LED of the
charger must flash.
! If a charging current flows, disconnect the battery
from the charger immediately.
- Replace the charger.
6
2.4

Testing the Secondary Voltage (12V/24V)

- Connect the charger to an adjustable isolating transformer.
- Connect a voltmeter (e.g. MMD 302) to connections A1 and B4
on the printed board.
- Set the isolating transformer to 230V.
- Set the switch S2 of the charger to 12V.
- Switch on the charger.
BML 2410 / 2410FW und 2415
The voltmeter must display an alternating voltage of approx.
12.9V.
BML 2415FW
The voltmeter must display an alternating voltage of approx.
14.7V.
- Set the switch S2 of the charger to 24V.
BML 2410 / 2410FW und 2415
The voltmeter must display an alternating voltage of approx.
22.5 V.
BML 2415FW
The voltmeter must display an alternating voltage of approx.
25.3 V.
- If the desired value is not achieved, disconnect the charger
from the isolating transformer.
- Check switch S2 is functioning correctly.
In the 12 V position, 1A-2A and 4a-5a are switched.
In the 24 V position, 2A-3A and 5a-6a are switched.
- If switch S2 is OK, the charger must be replaced.