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4 - 47
4 Installation and Wiring
NX-series CPU Unit Hardware User’s Manual (W535)
4-5 Co
ntro
l Panel In
stalla
tion
4
4-
5-6 Gro
unding
• Either install the Controller a minimum of 200 mm away from high-voltage lines or power lines, or
place the high-voltage lines or power lines in metal tubing and completely ground the metal tubing
to 100
Ω
or less.
Other Precautions
• Basic I/O Units have both plus and minus commons, so pay attention to the polarity when wiring.
This section describes the earthing methods and precautions.
on page 4-35 for details on the grounding of the Controller.
Local potential fluctuations due to lightning or noise occurred by power devices will cause potential fluc-
tuations between ground terminals of devices. This potential fluctuation may result in device malfunc-
tion or damage. To prevent this, it is necessary to suppress the occurrence of a difference in electrical
potential between ground terminals of devices. You need to consider the earthing methods to achieve
this objective.
The recommended earthing methods for each usage condition are given in the following table.
4-5-6
Grounding
Considerations for Earthing Methods
Specification of communications cables
for EtherCAT and EtherNet/IP
Earthing methods
Equipoten-
tial bonding
system
Star earthing
Daisy chain
Connecting
devices and
noise sources
to separate
earth elec-
trodes
Connecting
devices and
noise sources
to a common
earth electrode
The cable shield connected to the connector
hood at both ends of the communications
cable
*1
*1. Use this cable when using EtherCAT or when using EtherNet/IP with 1000BASE-T.
Recom-
mended
Recommended
Not recom-
mended
Not recom-
mended
The cable shield connected to the connector
hood at only one end of the communications
cable
*2
*2. You can use either of cables when not using EtherCAT or when using EtherNet/IP with 100BASE-TX or
10BASE-T.
Recom-
mended
Recommended
Not recom-
mended
Not recom-
mended
Neither EtherCAT nor EtherNet/IP used
Recom-
mended
Recommended
Not recom-
mended
Not recom-
mended
Example: Separating Controller from Power Lines
Metal tubing
200 mm
200 mm
High-voltage power panel
Power lines
Power
lines
Ground to 100 Ω or less
Controller
Controller
Содержание NX701-1620
Страница 11: ...9 Manual Structure NX series CPU Unit Hardware User s Manual W535...
Страница 46: ...Sections in this Manual 44 NX series CPU Unit Hardware User s Manual W535...
Страница 64: ...1 Introduction to NX series Controllers 1 18 NX series CPU Unit Hardware User s Manual W535...
Страница 72: ...2 System Configuration 2 8 NX series CPU Unit Hardware User s Manual W535...
Страница 90: ...3 Configuration Units 3 18 NX series CPU Unit Hardware User s Manual W535...
Страница 156: ...6 Inspection and Maintenance 6 14 NX series CPU Unit Hardware User s Manual W535...
Страница 163: ...I 1 I NX series CPU Unit Hardware User s Manual W535 Index...
Страница 166: ...I 4 NX series CPU Unit Hardware User s Manual W535 Index...
Страница 167: ......