85
11.
Analysis of common fault
Fault content
Analysis
No display on power
Check whether the power supply voltage is in the working voltage range.
Continue to malfunction, after disconnecting the power supply (refer to 3.3 assembly for
details), re-insert the main body and the module, restart the instrument after 1 minute, if the
fault is not eliminated, you need to contact our company for repair;
Incorrect reading of voltage and
current
Check the rated voltage and current of the primary side and secondary side is correct.
Check whether the wiring mode setting is consistent with the actual wiring.
Check voltage transformer, current transformer is in good condition.
Incorrect power or power factor
Check if the wiring mode setting is consistent with the actual situation;
Check if the voltage and current phase sequence is correct;
Communication is abnormal
Check whether the address, baud rate, check digit, etc. in the communication settings are
consistent with the host computer;
Check if the RS485 converter is normal;
Parallel connection of 120 ohms or more at the end of the communication;
Expansion
module
MCE
communication is not normal
Check whether the IP address, subnet mask, gateway address, port number, etc. are set
correctly.
Check if the host computer and the instrument network address are on the same network
segment.
Expansion
module
MCP
communication is abnormal
Check if the Profibus address is correct;
Whether the Profibus interface is loose;
Continue to malfunction, after disconnecting the power supply (refer to 3.3 assembly for
details), re-insert the main body and the module, restart the instrument after 1 minute, if the
fault is not eliminated, you need to contact our company for repair;
The expansion module MLOG
indicator is not blinking properly.
1. Check if the TF card is loose and the TF card is damaged (check it in communication or
display);
2, TF Error: The TF card is damaged, and the data in the TF cannot be written or read. After
disconnecting the power supply (refer to 3.3 assembly for details), take out the TF card and
APM8xx
