Maintenance
Batteries_Rail_Power_Manual_en02.docx
35
9.1.5.
Measuring the open-circuit voltage on each battery block/cell
Target: The open circuit voltages at each block/cell are measured.
1. Use a suitable measuring instrument (e.g. multimeter) to measure the open-circuit
voltage per block/cell and record the values in a maintenance report. For charged
rail.power blocks/cells the voltage must be above:
• 12.48 V for 12V-blocks
• 6.24 V for 6V-blocks
• 2.08 V for 2V-cells
Note
Before measuring the open-circuit voltage, let the cells / blocks rest for at least 4 hours (no
charge, no loads).
The above-mentioned voltage values are valid for a temperature of 20°C
2. Calculate the mean value from the measured values.
Note
If a rail.power block/Cell is more than
•
120 mV (12 V-block)
•
60 mV (6 V-block)
•
20 mV (2 V Cell)
below the calculated mean value, you must charge the entire battery, see following charging
condition.
Charge the battery for 24 hours with current limited to I
5
= C
n
/5h with following voltages:
•
14.1 V per block (12 V blocks)
•
7.05 V per block (6 V blocks)
•
2.35 V per cell (2 V cells)
Repeat the measurement 4 hours after charging is complete.
If the block/cell is then noticeable again, the entire battery must be replaced or you can contact
HOPPECKE Service
3. Enter your activities in a maintenance protocol, see
13.2 Maintenance protocol on page
Result: The open circuit voltages at each block/cell were measured.
