Operation Of The Power Pack Components; Theory Of Operation - JLG X390AJ-X14J Supplement Manual

SECTION 2 - SERVICE PROCEDURE
2.2

OPERATION OF THE POWER PACK COMPONENTS

Lithium Battery
Charger AC-DC
Lithium Battery
Pack

Theory of Operation

Switching ON the dual contact key switch (C) directs indi-
vidual contact with the 12V power from the Lead-acid bat-
tery (D) to power-up the ground module ECM1-2 (B), while
the other contact (38-48-72-76-83V) activates the inverter
contactor (N). The ground module ECM1-2 (B) power-up
the BMS (A) and the BMS (A) carries on the control of the
power pack system.
The BMS (A) monitoring the cells, opens/closes the inter-
nal contactor (L), manages the charge of the Lead-acid
battery (D) through the Transformer DC-DC (F) and switch
ON the inverter (N). The Inverter will close the external
contactor (M) when required to receive power to supply
the electrical motor.
When the internal and external contactors (L & M) are
closed, current from the Lithium battery pack is supplied
to the Inverter (N). Current is supplied to the electric
motor (G) according to the speed demand from the signal
(O) from the ECM1-2 (B), and the reserve of existing bat-
tery power and is controlled by the BMS (A).
2-2
The BMS regulates the amount of current coming IN
(recharge) and coming OUT (to electrical motor or the DC-
DC transformer). The BMS measures the total current (IN –
OUT) through the module LEM. (I).
If fault code occurs, the BMS keeps the internal contactor
(L) open and power is not available for the system. If a
fault is present, the Inverter (N) keeps the external contac-
tor (M) open, so power is not available for the electrical
motor.
LEAD-ACID
MAF11410
31215460