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Warning: DONOT operate the system restart repeatedly when
the Pre-charge error exist. The power connection（D+,D-）
may be short circuit.
3.7.2.6. Description of the parallel connection of battery control
modules
The first installation should do full charging progress.
After Master controller has communicated with each slave BMS, it
will run parallel operation. It will begin from lowest voltage
battery string to do the parallel operation during the charging.
If the status LED of BMS turns to green, it means this battery
string is in parallel operation.
When the voltage difference between strings is lower than the
default parameter, the battery string will do the parallel operation.
Then the power relays in BMS will switch ON after 30 seconds. The
“STATUS” lamp of the BMS will light green;
When the voltage difference between strings is higher than the
default parameter, the battery string will NOT do the parallel
operation, the “STATUS” lamp of the BMS will light red, but it is
normal; Such battery string will be paralleled in during charging
or discharging stage automatically.
Note: If there is no communication between master
controller and upper controller, the battery system can’t
work normally. External device should communicate with
battery system through LAN, CAN or RS485. Otherwise maybe
cause battery system work abnormal.
Caution: During first time power on, the system will
require to do fully charge progress for SOC calibration
purpose.
Caution: The whole Battery Energy Storage System (BESS) after
installation or restart the system when long time not in using
should charge it to full at first.
There will be a regularly (3 month) fully charge requesting during
continuous operation as well, it will be handled automatically by
the communication between BESS and external device.
3.8. Process of System Turning Off
When failure or before maintenance service, must turn the battery
system off:
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