Delta DPM-C520, Operation Manual

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6.1 Error Codes
When an error occurs during operation, the power monitor sends an error code through Modbus. The following
table lists the error codes and causes.
Error Code Name Description
0x01 Illegal function Incorrect function code
0x02 Illegal data address Incorrect data address to read or write
0x03 Illegal data value Incorrect data format (for example, data length)
0x04 Slave device failure Slave cannot execute the command.
6.2 Alarm Types
The power meter supports 10 types of alarms. You can activate the alarm in the registers 0x1F–0xB7. When an
alarm is triggered, the data (such as alarm type and alarm triggered time) are stored in registers 0x400–0x483.
The following table lists the details and descriptions for the alarm types.
Number Alarm Type Description
1 Over Current The measured current exceeds the setting value.
2 Over Voltage LL The measured line voltage exceeds the setting value.
3 Under Voltage LL The measured line voltage is below the setting value.
4 Over Voltage LN The measured phase voltage exceeds the setting value.
5 Under Voltage LN The measured phase voltage is below the setting value.
6 Over Active power The measured total active power exceeds the setting value.
7 Over Reactive Power The measured total reactive power exceeds the setting value.
8 Over Apparent Power The measured total apparent power exceeds the setting value.
9 Over Frequency The measured frequency exceeds the setting value.
10 Under Frequency The measured frequency is below the setting value.