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6F3A4768
E1
E
HT
E
N
E
D
INVERTER
E1
E1
CONVERTER
E
HT
E2
Existing
drive unit
Existing
drive unit
Transformer
Separation
plate
d) For a single-core
cable, connect the
shield of each phase.
For a crane and ships, only one
type is provided and it is allowed.
Coupling
Machine
Motor
Terminal box E
Frame E
c) Connect the terminal
box ground terminal and
frame ground terminal
with a cable
b) Shield of the main
circuit cable
If no neutral point is provided
in the converter, only E1 is
provided. In this case,
connect from INV to EHT.
e) Motor ground cable
Main circuit
neutral point
Drive unit control ground trunk line
(a2) Connect the drive unit ground from the panel
enclosures to the control ground trunk line (ED), at
one point.
(a1) Connect the drive unit ground from the panel enclosures to the main circuit
ground trunk line (EHT), at one point. Ground it from the converter panel
enclosure, whenever possible.
f) When adding a drive unit to the existing ones,
install a ground trunk line, separately from the
existing ground trunk line.
Ground trunk line for existing drive unit.
Drive unit main circuit
ground trunk line
Fig. 3.1.1 Recommended Ground Circuit
When recommendation grounding construction is not constructed,
a control equipment may incorrect-operate by the noise etc., or
may not function normally.
!
CAUTION
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