ADTEK AEM-DRB Operation Manual page 44

Chapter 5 Message of Abnormal Operations
5.1 Common malfunction analysis
5.1.1 Power meter dosen't work after it's electrified
• Make sure voltage and other wiring is correct, voltage should be in the future functional
range.
• Turn off meter and restart.
5.1.2 Voltage or current reading in incorrect
• Check the wiring mode settings match the actual wiring mode.
• Check the voltage potential transformer (PT) and current transformer (CT) variable ratio
are set correctly.
• Check the GND is correctly grounded.
• Check the voltage potential transformer (PT) and current transformer (CT) are intact.
5.1.3 Power or power factor reading is incorrect,
• Compare the voltage and current input of the inter-wiring and wiring diagram to check
whether the phase relationship is correct.
5.1.4 RS-485 communication is unusual
• Check the communication baud rate, ID and communication protocol setings of the upper
machine are consistent with the meter.
• Please check whether the data bit, stop bit, check bit settings are consistent with the host
computer.
• Check if RS-485 converter is working.
• Check whether there is any problem with the entire communication line (short circuit,
open circuit, grounding, whether the shield wire is correctly grounded at single-end, etc.).
• Turn off the meter and host computer, and then restart.
• For long communication lines, it is recommended that a matching resistance of about 120
ohms be connected in parallel at the end of the communication line.
but voltage and current are correct
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