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E31 Series Installation Guide
Troubleshooting
Z205667-0G
Page 22 of 23
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Problem
Product is not communicating over
Modbus daisy chain
RX LED is solid
The main board has a fast flashing amber
light
The main board has a slow flashing
amber light
The main board has a flashing green light • Everything is wired properly and the main board has power.
The main board is a flashing or solid
red light
Split-core product is reading zero for
some values
Power factor reading is not as expected
Current reading is not as expected, or
reading is on different CT number than
expected
Current is reading zero, even when small
currents are still flowing through circuit
E3x Config Tool returns Modbus error on
read/write
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• Check the unit Modbus address to ensure that each device on the daisy chain has a unique
address.
• Check Parity.
• Check the communications wiring.
• Check that the daisy chain is properly terminated.
• Check for reversed polarity on Modbus comms.
• Check for sufficient biasing on the Modbus bus. Modbus physical specification calls for 450-650 Ω
biasing. This is usually provided by the master.
• Verify ribbon cable connectors are inserted in the correct orientation.
• If cables are correct, reset main board to re-initialize product.
• One or more channels is clipping. This can be caused by a signal greater than the split-core size or
277 V L-N, or by a signal with high THD near the gain stage switching points (1.5 A and 10 A).
• Light may be red briefly while device powers up.
• If light is red for more the 60 sec. device has encountered a diagnostic event. Contact technical
support.
• Device was unable to read split-core adapter boards on power up. Verify adapter boards are
connected.
• Verify ribbon cable connectors are inserted in the correct orientation.
• Reset main board to re-initialize product.
• Verify voltage taps are connected in appropriate phase rotation.
• Verify phase rotation of breakers (firmware rev. 1.012 or higher allows for custom rotation if
needed).
• Verify ribbon cable is fully seated and in the correct orientation.
• The product cuts off at 50 mA, and will set the reporting register to 0 mA for currents near or
below this range.
• Verify using the latest release of E3x Config Tool as older versions may not support all features
in current product firmware. Latest version is available on our website http://www.veris.com/
modbus.aspx
Solution
TM
0815
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