The multi-functional power meter does not display anything after being powered on.
Possible cause: Auxiliary power supply not connected to the instrument.
Solution: Use a multimeter to measure whether there is a corresponding working voltage on the auxiliary power supply terminals (L, N) of the instrument; check whether the auxiliary power supply connection is reliable.
The displayed data is inaccurate.
Possible causes: Incorrect transformer ratio setting, parameter mismatch, incorrect wiring configuration.
Solution: Verify that the transformer ratio set on the instrument matches the transformer ratio of the PT and CT; check that the rated values of voltage and current are consistent, and that the wiring method matches the settings.
Possible cause: The signal is not being applied to the instrument.
Solution: Test whether there is a signal at the instrument's terminals and whether the terminal connection is reliable.
Three-phase meter missing phase
Possible causes: The signal is not being applied to the instrument; settings are incompatible.
Solution: Test whether there is a signal at the instrument's terminals and whether the terminal connection is reliable; connect the normally displayed signal line to the corresponding terminal that is missing to verify whether the problem is with the instrument or the external circuit; check whether the wiring method set on the instrument is consistent with the wiring method on site.
Inaccurate electricity metering
Possible causes: Incorrect turns ratio, incorrect phase sequence of voltage and current.
Solution: Check if the transformation ratio set on the instrument is consistent with the transformation ratio of the PT and CT; check if the phase sequence of voltage and current is correct; when using electricity, for instruments with active power display, check if there is a negative sign for single-phase power on the power display. If there is a negative sign, it is very likely that the input and output lines of the corresponding phase current are reversed.
Inaccurate analog output
Possible cause: Incorrect analog output range or project correspondence.
Solution: Confirm the correspondence between the upper and lower limits of the analog output range; confirm whether the electrical parameters corresponding to the analog output are correct, such as corresponding to U, I, P, Q, etc., and ensure that the test equipment is normal. If using a PLC, ensure that the PLC analog input wiring settings are correct.
DI switch input display intermittently open and closes, causing false alarms.
Possible causes: The problem may be due to a loose connection in the auxiliary contacts of the switch on the circuit or a problem with the system settings.
Solution: Check the network connection and backend system settings.
The instrument failed to display the required function.
Possible causes: Troubleshooting: Check if this model of instrument includes this function.
Solution: Understand the functions of the instruments you order. Different models have different functions. Do not blindly connect wires or use them.
Communication error
A: The instrument is not sending back data.
First, ensure that the instrument's communication settings, such as slave address, baud rate, and verification method, are consistent with the host computer's requirements. If multiple instruments in the field are not sending data back, check if the field communication bus connection is accurate and reliable, and whether the RS485 converter is functioning properly. If only one or a few instruments are experiencing communication problems, also check the corresponding communication lines. You can test by changing the addresses of the slave instruments that are abnormal and those that are normal to rule out or confirm host computer software issues. Alternatively, you can test by changing the installation locations of the abnormal and normal instruments to rule out or confirm instrument malfunctions.
B: The instrument is sending inaccurate data.
Please carefully read the instructions in the communication address table regarding data storage address and format, and ensure that the data is converted according to the corresponding format. You can use ModScan32 software to test instrument communication. This software follows the standard Modbus-RTU protocol, and data can be displayed in integer, floating-point, and hexadecimal formats, allowing direct comparison with the instrument's displayed data.
C: Communication indicator status information
During communication testing, the instrument's communication indicator will flash when the instrument receives data.
D: Communication data abnormality
On-site wiring requires two-core twisted-pair shielded cable, and the shielding cable must be reliably grounded.
