BYD B-BOX 2.5 - Normal Issues and Solutions; Normal Alarm and Solution Display on SMA Sunny Island SRC

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9 Normal issues and solutions
9.1 Normal alarm and solution display on SMA sunny island SRC
SMA SRC
Reason
Solution
F221
External Alarm-Invalid Bat Type
Reset battery type to "Li" on SRC.
F920(XA01General)
1.All the batteries are failed to
communicate at the same time;
2.BMU and battery are failed to
RS485communicate;
1.Inspect whether the RS485 communicate
cable has been connected correctly and
reliability；
2.Inspect DIP switch setting according to the
setting of DIP switch guidance in user manual;
3.Change BMU in cabinet；
F930(XA11Short)
External Alarm - Short circuit
1.Power off;
2.Inspect short connection of cable between
P+&P-;
3.If short connection is confirmed, please
reconnect cable correctly;
4.restart battery;
F952
External Alarm –Ext BMS Timeout
1.Check the CAN communication, make sure
connect well.
2.Change BMU.
W936(XW01General)
External Warning - General
1.Inspect whether the RS485 communicate
cable has been connected correctly and
reliability；
2.Inspect the setting of DIP switch according
to the Address setting guidance;
W937(XW02DcHiVolt)
External Warning - Battery High Voltage
Normal alarm and no need to deal with;
W938(XW03DcLoVolt)
External Warning - Battery Low Voltage
Normal alarm and no need to deal with;
W939(XW04DcHiTmp)
External Warning - Battery High Temp
Normal alarm and no need to deal with;
W940(XW05DcLoTmp)
External Warning - Battery Low Temp
Normal alarm and no need to deal with;
W941(XW06DcHiTmpC)
External Warning - Battery High Temp
Charge
Normal alarm and no need to deal with;
W942(XW07DcLoTmpC)
External Warning - Battery Low Temp
Charge
Normal alarm and no need to deal with;
W943(XW08DcHiCur)
External Warning - Battery High Current
Normal alarm and no need to deal with;