SECTION 2 - SERVICE PROCEDURE
2-28
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Lithium ION Battery Charger Setting (1st & 2st Gen)
Due to difference in the local power supply, the settings
on battery charger can change the maximum current
drawn from network from 18 A to 30 A. The difference on
the setting is the time required for charge.
On CE spec machines, the time required to completely
charge a battery pack is approximately 4 hours, but after 2
hours the level will be at 80%. The BMS controls the bat-
tery charger to supply the maximum current for 2 hours
(according the set-up mentioned above); sufficient time
for at least one cell to reach 3630 mV. Then the BMS con-
trols the battery charger to reduce the charging current.
The difference for the 72V and 83V battery pack is the cur-
rent setting between CE and ANSI North America spec.
This causes a difference in time necessary to reach the
Equalization phase will be approximately 4 hours instead
of 2 in case of ANSI North America spec machines. The
equalization phase could be shorter as the cells level
grows more consistent because the cells are supplied with
lower current and as a result the cells will be almost equal-
ized. The time required to charge a 72V battery pack on
ANSI machine is 6-8 hours.
If a cell reaches an excessive voltage during the charging
process, the BMS goes in emergency mode and it opens
the internal contactor immediately.
It is possible to operate the machine when batteries are
charging; in this condition if the current necessary for the
movement is more than the maximum current available
from the battery charger, the additional energy required
by the system is utilized from the battery pack to run the
electric motor.
Battery Charging and Discharging
Battery discharge condition
All the cells will discharge together while machine is oper-
ating as they are connected in series. BMS constantly
monitors the total voltage level and sends this value in the
CAN BUS cable and the data is shown on the remote con-
trol display.
As soon as the voltage level drops to 20% or below, the
remote control starts to beep to inform the operator that
the battery pack level is low. If the voltage level drops to
10% or less, BMS reduces the current supply to the electri-
cal motor to operate with the machine in a very slow
speed. The operator to recharge the batteries before the
complete discharge.
Battery level below 10% = Extra Low Speed
Complete battery discharge is not 100%. Even if the oper-
ator uses the machine until it stops, the cells cannot get
damaged due to excessive low voltage. If one cell goes
below a specific voltage level, the BMS decreases the
speed or stops the machine by interlock of the internal
contactor.
MAF11700
Figure 2-24. Battery Charger Setting
Configuration setting
ANSI US - 18Amp 48 volt - 13 Amp 72Volt
CE - 25 Amp 48Volt - 30 Amp 72Volt
MAF16970
Figure 2-25. Charger Set (3rd Gen)
Charge options :
1 Standard
2,2kW
2
1,2kW
MAF11710
Remote Control Display
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