Yaskawa Solectria Solar
DOCR-071070
Page 24 of 30
System Configuration
4.4.1
Defining the Maximum and the Minimum Battery Operational Voltage
In addition to the battery’s own safeguards to prevent overcharge and under discharge, the inverters
have high and low safety limits for the DC voltage. If operating outside that voltage band, the inverters
will be idling. The voltage rails need to be set up only once by the PMC through MODBUS TCP/IP
messaging:
Table 4-1 Battery Voltage Modbus Addresses
MESSAGE
MODBUS ADDRESS DATA TYPE
SCALE FACTOR
MINIMUM BATTERY VOLTAGE
40897
Float32
-
MAXIMUM BATTERY VOLTAGE
40899
Float32
-
The minimum/maximum battery voltages are adjustable. The default values are set to the maximum
limits:
Table 4-2 Battery Voltage Minimum and Maximum Limits and Default Values.
DEFAULT
DEFAULT
MINIMUM
BATTERY
VOLTAGE
860V
DEFAULT
MAXIMUM
BATTERY
VOLTAGE
1300V
Please refer to your battery manual to find out what the safe voltage limits are.
4.4.2
Constant communication between PMC and inverters
In order to prevent an accidental under discharge or overcharge of the battery, by loss of communication
between PMC and inverters, a changing (in its value) heartbeat message from the PMC needs to be
received by the parent inverter at least every 20s. If the parent inverter has not received an updated
heartbeat message in the last 20s, it will take all inverters offline.
Table 4-3 Heartbeat Modbus Addresses
MESSAGE
MODBUS
ADDRESS
DATA TYPE
SCALE FACTOR
HEARTBEAT
40894
uInt16
-
