User manual

POWER INSTRUMENTS

Event alarming

When the metering data is over the pre-setting limit and over pre-setting

time interval, the over limit alarming will be picked up. The over limit value and

time will be recorded and the maximum number of records is 16. The digital

output (DO) and RO1, RO2 can be used as a trigger to light or sound alarming.

Alarming can also trigger waveform capturing.

Application and settings of event alarming:

In order to use the event alarming function, you should finish all the

settings (equation or in equation or enable switches) correctly, or it will fail. All

the settings are to write their corresponding registers via communication.

1. Alarming setting

Table 4-1 indicates a group of settings, there are 16 groups in all with the

same format. Parameter is the main body. There are 247 parameters in all as

shown in table 4-2.

We use the serial number instead of its parameter to nish the settings, the

serial number will be stored in the rst storage unit of every group.

What is most important is parameter, so we can calculate some equations

or in equations to get the goal. For example, if we want one event of frequency

equaling to 50 Hz, we set: serial number: 0; comparison mode: 2; setting value:

5000.

Special attention: “setting value” corresponds to main parameter, the

relationship between its value and real physical value is the same as the main

parameter.