Trouble Detection And Solution - Hitachi FL.NET User Manual

7.1.2 Trouble detection and solution

(1) Is the cabling correct?
Check cables for disconnection or
incorrect connection.
(2) Are the modules mounted correctly?
Check that no set screws loosen.
Check if a model LQE702 module is
intermixed with a model
LQE500/LQE502/LQE701 module
among the same series of similar
modules installed. The four different
models may not be intermixed on the
same mount base.
(3) Is grounding correct?
Do not ground the ET.NET module in
the same place where high-voltage
equipment is grounded. They must be
grounded in separate place.
Perform grounding work conforming
to Class D grounding or higher.
(4) Are LG and FG separated?
Be sure to separate the LG from the FG
or vice versa because power noise
enters the FG via the LG. Failure to
observe this rule may result in an
equipment malfunction.
Ground the LG at the power supply
side.
LG is here.
FG is over there.
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7 TROUBLESHOOTING