GE Mark VIe System Manual page 176

Trace the cable
back to the
distribution board
(for example JPDL,
JPDC, JPDH for
packs, also JPDP
for switches).
Is there power at
the board
connector to the
cable?
Is the power
distribution board
fed incoming power
from another power
distribution board?
Is there power
at the output
connector on
the power
supply?
No
Replace the
power supply
Is there power
Yes
at the input to
the power
supply?
Troubleshooting Power Loss to Controllers, I/O Packs, or IONet Switches
176 GEH-6721_Vol_I_BP
Controller, IONet switch, or I/O pack
power LED is not lit.
Is there voltage
at the cable
No
feeding power to
the I/O pack,
Ethernet switch,
or controller?
Replace the cable
between power
Yes
distribution board
and I/O pack,
Ethernet switch, or
controller.
Replace the power distribution
board that is directly connected
No
to the I /O pack, Ethernet switch,
or controller.
Yes
Is there input
power from the
Yes
cable leading
distribution
No
Is the power
distribution
Yes
board fed
incoming power
from a power
supply?
Yes
Replace the
cable
No
Yes
pack, Ethernet
Replace the power
cable that connects
between both
power distribution
boards .
Is there
power at the
prior
distribution
board output
connector?
No
to prior
board?
Continue to trace power back
to cabinet power entry (check
circuit breakers, disconnects,
contactors, and so forth).
GEH-6721_Vol_I Mark VIe and Mark VIeS Control Systems Volume I
Public Information
Replace the
switch, or
controller.
Replace the
Yes
fuse.
Yes
Are there
No
any blown
fuses?
No
Does the
distribution
Yes
board have
Turn switch any switches
to ON.
in the OFF
position?
No
Is there
incoming
No
power at the
input cable?
Yes
Replace the
board