SECTION 2 - SERVICE PROCEDURE
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Lead-Acid Battery
The Lead-acid Battery supplies power to switch on the
ECM1-2 (1st & 2nd Gen) ECM 1 (3rd Gen) and the BMS.
When BMS is ON, it closes the internal contactor and turns
ON the DC-DC Transformer which then provides the 12-
volt power for the machine system, demanding energy of
the lithium pack. If the Lead-acid battery does not have
sufficient charge or is fully discharged, the main board
and the BMS will not be switched ON and the machine
cannot start.
If the main key is ON and the voltage level of the battery
pack is less than 20%, the EMC1-2 will turn OFF all the sys-
tem after one hour of no implements activation.
If the key switch is left in the ON position, the Lead-acid
battery will be preserved from complete discharge.
DC-DC Transformer
The BMS is powered by the 12V auxiliary battery, to ensure
proper functionality even if the battery pack is completely
discharged. It also powers the other ECM of the platform.
The charging process of this Lead-acid 12V battery is per-
formed by an electronic board (DC-DC) which transforms
the DC 38V/48V/72V/76V/83V of the battery pack into DC
12V to keep the auxiliary battery charged. DC-DC trans-
former is ON when the BMS is ON. When the machine is
OFF and the battery pack is under charged DC-DC remains
ON. The output voltage is approximately 13. 5 Volt. When
DC-DC is ON, it supplies current to all the boards and the
devices of the platform.
MAF11770
MAF11780
Figure 2-28. DC-DC for 38V/48V Battery Pack
MAF11790
Figure 2-29. DC-DC for 72V/76V/83V Battery Pack
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