2. ERROR ANALYSIS
Please refer to the general steps before proceeding, see chapter 1.
2.1 BMU does not turn on / BMU LED is off or flickering abnormally
LEDs of BMU do not light up, although the battery is ON.
No.
Name
Description
7
Check correct cable port
Make sure that the correct data cable port has been used at the BMU (“BMS” port.
Do not mix with “inverter” or “Ethernet” port).
8
Replace Comm Cable
Try a completely new communication cable between battery and BMU.
Note: Sometimes it might be necessary to unplug the communication cable and
plug it again while batteries are switched on.
9
Voltage measurement on
pin 7&8
Measure the voltage of PIN 7 & 8 while the other side of the cable is connected to
the IN port of the Battery-Box and while the Battery-Box is powered on. Voltage
should be around 50V. If yes: try another BMU (if available). If no: check another
cable or try another LVS if multiple batteries are installed in the system.
10
Only LED faulty?
In some rare cases, the LED of the BMU is faulty. To check that: check if there is a
WIFI access point of the Battery-Box and check if there are internal LEDs inside the
BMU. If so, only the external LED is inactive and a commissioning could still work.
11
Voltage measurement
Check voltage of battery. See
Section 2.10
12
Module Exclusion Method
Check if system works when removing the suspected module. See
section 2.11
13
BMU exchange
If problem remains:
Test another BMU, if available.
2.2 Modules do not show any reaction / No LED on module
LEDs of some module do not light up,although button on topmost module is pressed for 3 seconds..
No.
Name
Description
14
Swap module position
Note: If top modules have active LED but bottom modules don’t, it indicates a
connection issue between modules. Example:
LVS16.0 (4 modules). Module 1&2 have LED, module 3&4 don’t have LED.
Issue is in the connection between module 2 &3. Problem likely to be
module 2 (less likely: module 3).
- Remove the affected module and check whether problem disappears. If not,
check the module below.
- Rearrange the modules in the tower.
Note: The affected module often works without restrictions at the lowest module
position of the tower.
4
