5
2.1.3 Voltage
measurement
2.1.4 Only LED faulty? In some rare cases, the LED of the BMU is faulty. To check that:
check if there is a Wi-Fi access point of the Battery-Box. If so, only
the external LED is inactive and a commissioning could still work.
2.1.5 Module
Exclusion
Method
Check if system works when bypassing the suspected module.
See section 3.2.
2.1.6 BMU exchange
If problem remains, try another BMU, if available.
2.2 Some modules do not show any reaction / No LED on module
LEDs of some modules do not light up, although button on topmost module is pressed for 3
seconds.
No.
Name
Description
2.2.1 Comm cable
2.2.2 Only LED faulty? In some rare cases, the LED of the module is faulty. To check
that: use BC APP or BCP to check whether the BMS information
of this module could be detected.
2.2.3 Switch on the
suspected
module
Press the LED button for three seconds to power one the
suspected module. If the LED cannot be lighted up, the battery
module is faulty.
2.2.4 Voltage
measurement
Check voltage of the affected module(s). See Section 3.1. Voltage
should be around 50V. If voltage is lower than 38V, it might be
unable to power on.
Try to charge it as soon as possible if a charger is available, or
replace it.
Try to unplug the comm cable between the first affected LV Flex
Lite
module and the one above it, and plug it again.
Or try a completely new comm cable between the first affected
LV Flex Lite module and the one above it
Battery voltage should be around 50V, see Section 3.1 for
voltage
measurement.
If yes: try another BMU (if available).
If no: check another cable or
Try another LV FLEX Lite if multiple batteries are
installed in the
system.
