GE Industrial Solutions POWER LEADER PMCS Network Architecture Guide - Manual (Page 53)

Power Management Control System
Chapter 4 – Trouble-Shooting
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8. When the error has been localized to one RS-485
network, commnet segment, check that control
power is available to every IED requiring it. If
control power to certain IEDs is disconnected or
turned off, it may disable communications on that
segment.
9. If all the IEDs on the network or segment have
control power and the error persists, disconnect all
the IEDs except the Repeaters. If practical,
disconnect the IEDs one at a time to see which IED
is causing the error.
10. If it is not possible to test communication as each
IED is disconnected, check the Repeaters with all
other IEDs disconnected. Both green LEDs should
be lit on every Repeater. If a red LED is lit, it may
indicate that the COMM
+ and COMM − lines are
shorted somewhere on that segment. Refer to the
trouble-shooting section of the Repeater manual if
both green LEDs are not lit.
11. If all Repeaters on the commnet segment show two
green LEDs when connected to the commnet cable,
the error is probably caused by one of the IEDs on
the segment. Connect the IEDs one at a time,
establishing communication with each one. Refer to
the IED instruction manuals for procedures for
communicating with each IED.
4–2 Host Trouble-Shooting
If the procedure for communication network trouble-
shooting does not isolate the problem, use the following
procedure to determine if the host is at fault.
1. If the host is at fault, it probably will not be able to
communicate with any IED. If this host can
communicate with one or more IEDs, return to
Section 4-1.
2. Check that power is connected to the network
interface card in the host PC; if you are using an
Ethernet Gateway, make sure that its control power
is connected. Ensure that the Ethernet network
interface card in the Host PC is properly connected
and seated in its expansion slot.
3. If using an RS-485 interface card(s), check that the
card(s) is seated properly in its slot and that the
proper terminating resistors are applied.
4–3 IED Trouble-Shooting
To determine if an IED is causing network problems,
disconnect it from the network, then refer to the
appropriate user manual for the trouble-shooting
procedure.
4–4 Equipment Trouble-Shooting
To determine if a section of equipment is causing network
problems, disconnect it from the network, then refer to the
appropriate user manual for the trouble-shooting
procedure.
4–5 Product Service Procedure
Call the GE Resolution Center at 1-888-GE-RESOLV if you
have any additional questions or problems.