Identifying Ied Application Problems; Inspecting The Wiring - Hitachi 650 Series Operation Manual

1MRK500128-UEN Rev. H
IEC16000001 V1 EN-US
3. Enter a new password using the on-screen keyboard.
To cancel password change, press
8.3.2

Identifying IED application problems

Navigate to the appropriate menu in the LHMI to identify possible problems.
• Check that the function is on.
• Check that the correct setting group (1 to 6) is activated.
• Check if the function is blocked.
• Check if the IED is in the test mode.
• Check the measurement values.
• Check the connections to trip and disturbance recorder functions.
• Check the TRM channel settings.
• Check the cycle time of the SMAI block.
• Check the DFT reference of the SMAI block.
8.3.2.1

Inspecting the wiring

The physical inspection of wiring connections often reveals the wrong connection for phase currents
or voltages. However, even though the phase current or voltage connections to IED terminals might
be correct, wrong polarity of one or more measurement transformers can cause problems.
• Check the current or voltage measurements and their phase information from Main menu /
Measurements/Analog primary values or Analog secondary values.
• Check that the phase information and phase shift between phases is correct.
• Correct the wiring if needed.
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• Check the actual state of the connected binary inputs.
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• Measure output contacts using the voltage drop method of applying at least the minimum
contact load given for the output relays in the technical data, for example 100 mA at 24 V
AC/DC.
650 series
Operation manual
IEC16000001-1-en.vsdx
Change the parameter Negation in Configuration /Analog modules/3 phase analog
group /SMAIn:1 (n= the number of the SMAI used).
Changing the Negation parameter is not recommended without special skills.
Change the parameter in PCM600, see PCM600 documentation.
In LHMI, select Main menu /Test/Binary input values . Then navigate to the board with
the actual binary input to be checked.
Check the actual state of the connected binary inputs through PCM600, see PCM600
documentation.
Output relays, especially power output relays, are designed for breaking high currents.
Due to this, layers of high resistance may appear on the surface of the contacts. Do not
determine proper functionality of connectivity or contact resistance by measuring with a
regular hand-held ohm meter.
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Section 8
Troubleshooting
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GUID-665B75A6-A074-4A03-ADF1-3D0FAD198E61 v8
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