JLG X20JP - X600AJ Service Manual - Manual (Page 309)

SECTION 6 - JLG CONTROL SYSTEM
3121623 – JLG Lift – 6-93
Check the values in the windows indicated hereby.
Figure 6-90.
At the end of the charge (cells balancing operation), you
should have the follow values:
Delta (mV): it is the difference from the highest cell and the
lowest cell (Volt).
It should be around 50 (mV) or less.
Lowest: It is the lowest cell (Volt). It should be more than
3550 mV. Normally this data concerns only one cell, its
number is indicated in the window “at”.
Highest: It is the highest cell (Volt). It should be around
3620/3630 (Volt). Normally the highest cell indicated in the
window “at” changes after a while.
Average: It is the average of the total cell values (Volt).
Normally at the end of the balancing phase, it should be
from 3600 mV to 3630 mV.
Then check the windows indicated hereby:
Figure 6-91.
At the end of the charge (cells balancing operation), you
should have the follow values:
Voltage: It is the total level of the battery pack voltage
DMCC (A): It is the current required from the BMS. During
the balancing operation, it should change from 0 to 6/7
Ampere.
NOTE: In cases the network cable is not connected, or we are in
the first step of the charge, or as soon the network cable is
connected, the current required is the maximum, so it
should be 13 or 30 Ampere (depends on the country).
DMCC and DMDC: Not important
SOC (%): It is the level of the battery pack charge. 100% is
the maximum
Current (A): It is the real value of the current measure by
the LEM sensor. If there is the sign “–“ the current is going
out from the battery pack, if the sign is absent, the current
is going in.
Other values are not important.
Note about the charge:
The BMS ask the maximum current possible (13 or 30 A)
until the first cell reach 3630 mV, then it reduce the current
requested.
All the cells are connected together as series, so BMS has
to charge it all together, however it can discharge the
highest cell connecting it to a resistance (there is one
resistance in BMS for every cell); the result is that the
highest will remain at 3630 and the other ones will con-
tinue to grow.
Every time a new cell will reach 3630 mV the BMS will start
to connect it to its resistance, so at the end all the cell will
be charged at the same level and they will have the same
performances.
Normally a good battery pack should have (at the end of
the balancing phase) the value Delta (mV) less than 50
mV, and average around 3600 mV.
Do you have a Delta (mV) value more than 150 mV, and
the highest cell has already reached 3630 mV?
Take note of the voltage and the number of the highest
cells, than leave the machine under charge for a complete
night.
If the after a night the situation still the same, replace the
BMS.
F – Lead battery is not charged by the system
79.59
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