7.3.3.1
Inspecting the wiring
The physical inspection of wiring connections often reveals the wrong connection for
phase currents or voltages. Even when the phase current or voltage connections to IED
terminals are 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
.
•
Check that the phase information and phase shift between phases is correct.
•
Correct the wiring if needed.
•
Change the parameter
ReversePolarity
in
Configuration/I/O modules/
AIM2
for the channel n (n= the number of the channel that has wrong
polarity).
•
Change the parameter in PCM600. See PCM600 documentation for more
information.
•
Check the actual state of the connected binary inputs.
•
In LHMI, select
Main menu/Monitoring/I/O status/Binary input
modules
. 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 for more information.
•
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.
Section 7
1MRS756509 E
Troubleshooting
88
630 series
Operation Manual
