Recommended Accessories; Troubleshooting - Veris Industries E34 Series Installation Manual

E34 Series Installation Guide
Recommended
Accessories

Troubleshooting

Z207251-0C Page 41 of 42
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Part ID
AE001 E3x MCB Cover
CBL008 Flat ribbon cable, 50 x 28 AWG, 1.5 ft. (0.45 m)
CBL016 Flat ribbon cable, 50 x 28 AWG, 4 ft. (1.2 m)
CBL017 Flat ribbon cable, 50 x 28 AWG, 5 ft. (1.5 m)
CBL018 Flat ribbon cable, 50 x 28 AWG, 6 ft. (1.8 m)
CBL019 Flat ribbon cable, 50 x 28 AWG, 8 ft. (2.4 m)
CBL020 Flat ribbon cable, 50 x 28 AWG, 10 ft. (3.0 m)
CBL021 Flat ribbon cable, 50 x 28 AWG, 20 ft. (6.1 m)
CBL022 Round ribbon cable, 50 x 28 AWG, 4 ft. (1.2 m)
CBL023 Round ribbon cable, 50 x 28 AWG, 10 ft. (3 m)
CBL024 Round ribbon cable, 50 x 28 AWG, 20 ft. (6 m)
CBL025 Flat ribbon cable, 50 x 28 AWG, 2 m
CBL026 Flat ribbon cable, 50 x 28 AWG, 4 m
CBL027 Flat ribbon cable, 50 x 28 AWG, 6 m
CBL031 Round ribbon cable, 50 x 28 AWG, 1.5 ft. (0.45 m)
CBL032 Round ribbon cable, 50 x 28 AWG, 2.5 ft. (0.76 m)
Problem
Product is not communicating over
Modbus daisy chain
RX LED is solid (E34A models)
The main board has a slow flashing
amber light (E34A models)
The main board has a flashing green
light (E34A models)
The main board has a flashing or solid
red light (E34A models)
Power factor reading is not as expected
Current is reading zero, even when
small currents are still flowing through
circuit
Non-zero current or power readings
are showing on one or more unused
channels.
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Description
• 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.
• 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).
• Everything is wired properly and the main board has power.
• 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.
• The light will flash red if incompatible CT strips or adapter boards are detected
• 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).
• The product cuts off measurements if the current on any input is less than 0.1% of the full range
current setting used for any CT, and will set the reporting register to 0 mA for currents near or
below this range.
The CT range setting of any channel that does not have a CT actually connected should be set to
zero. Channels without CTs connected will pick up noise that can cause non-zero readings if the
range is not zero. When CTs are properly connected, the impedance of the CT itself will absorb
spurious noise at the proper range setting.
Solution
TM
0420