JLG X20JP - X600AJ Service Manual - Manual (Page 303)

SECTION 6 - JLG CONTROL SYSTEM
3121623 – JLG Lift – 6-87
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 6-73.
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 25 or 18 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 sign is absent, the current is
going in.
Other values are not important.
Note about the charge:
The BMS ask the maximum current possible (18 or 25 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
Check the voltage of the lead battery.
Is it more than 12 Volt?
If yes go to step 23, if no go to step 22.
22 – Lead battery voltage is less than 12 Volt.
Charge the battery by an external battery charger, then
test the machine again
23 – Lead battery voltage is more than 12 Volt.
Take note of the correct voltage on the lead battery, than
turn on the machine: is the voltage value higher (12,8 Volt
or more)?
If yes go to step 24, if no go to step 25
24 – Volt at the lead battery with the machine on are
higher (12,8 Volt or more) than the ones with the machine
off.
DC-DC works properly, so to charge the lead battery it is
necessary to leave the machine on for some hours, or it is
necessary to connect the network cable for some hours.