System Configuration; Defining The Maximum And The Minimum Battery Operational Voltage; Constant Communication Between Pmc And Inverters - YASKAWA ACS-500 User Manual

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
MINIMUM BATTERY VOLTAGE
MAXIMUM BATTERY VOLTAGE
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.
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
HEARTBEAT
Yaskawa Solectria Solar
MODBUS ADDRESS DATA TYPE
40897
40899
DEFAULT MINIMUM
VOLTAGE
DEFAULT MAXIMUM
VOLTAGE
MODBUS
ADDRESS
40894
Float32
Float32
DEFAULT
BATTERY
860V
BATTERY
1300V
DATA TYPE
uInt16
DOCR-071070
SCALE FACTOR
-
-
SCALE FACTOR
-
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