Table of Contents
Advertisement
Section 8
Troubleshooting
8.3.2.1
154
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
voltages.
•
Check that the phase information and phase shift between phases is correct.
•
Correct the wiring if needed.
•
Change the parameter Negation in Configuration/Analog modules/
3PhaseAnalogGroup/1:SMAI_20_n (n= the number of the SMAI used).
•
In PCM600, change the parameter CTStarPointn (n= the number on the
current input) under the parameter settings for each current input.
•
Check the actual state of the connected binary inputs.
•
In LHMI, select Main menu/Tests/Binary input values/Binary input
modules. Then navigate to the board with the actual binary input to be checked.
•
With PCM600, right-click the product and select Signal Monitoring. Then
navigate to the actual I/O board and to the binary input in question. The
activated input signal is indicated with a yellow-lit diode.
•
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.
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.
Changing the Negation parameter is not recommended
without special skills.
1MRK 506 331-UUS A
Commissioning Manual
Advertisement
Table of Contents
