Wiring; Wiring Precautions; Connections Of External Wiring To Terminal Box - YOKOGAWA EJX Series User Manual

5.

Wiring

NOTE
For F Fieldbus and PROFIBUS PA
OUNDATION
communication types, please refer to manuals in the
attached CD-ROM.
5.1 Wiring Precautions
IMPORTANT
• Lay wiring as far as possible from electrical noise
sources such as large capacity transformers,
motors, and power supplies.
• Remove electrical connection dust cap before
wiring.
• All threaded parts must be treated with
waterproofing sealant. (A non-hardening silicone
group sealant is recommended.)
• To prevent noise pickup, do not pass signal and
power cables through the same ducts.
• Explosion-protected instruments must be wired
in accordance with specific requirements (and,
in certain countries, legal regulations) in order
to preserve the effectiveness of their explosion-
protected features.
• The terminal box cover is locked by an Allen head
bolt (a shrouding bolt) on ATEX flameproof type
transmitters. When the shrouding bolt is driven
clockwise using an Allen wrench, it gose in. The
cover lock can then be released and the cover can
be opened by hand.
When a cover is closed it should be locked by a
shrouding bolt without fail. Tighten the shrouding
bolt to a torque of 0.7 N·m.
Shrouding Bolt
Shrouding Bolt
Figure 5.1 Shrouding Bolt
• Plug and seal an unused conduit connection.
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<5. Wiring>
5.2 Connections of External
Wiring to Terminal Box
5.2.1 Power Supply Wiring Connection
Connect the power supply wiring to the SUPPLY + and
– terminals.
+
Power supply
–
Figure 5.2 Power Supply Wiring Connection
5.2.2 Configuration Tool Connection
Connect the configuration tool to the SUPPLY + and
– terminals. (Use hooks.)
Transmitter terminal box
USB
FieldMate Modem
PC/FieldMate
Figure 5.3 Configuration Tool Connection
5.2.3 Status Output Connection
When option code /AL is specified, connect the external
wiring as shown in Figure 5.4.
To configure and activate the process alarm function and
status output, it is necessary to set some parameters.
Refer to each communication manual for procedures.
Transmitter
terminal box
Shielded cable
External power
supply 30V DC,
120mA max
Use two-wire separately shielded cables.
Figure 5.4 Status Output Connection
28
Transmitter terminal box
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Power supply
+
–
Ignore the polarity since
the configuration tool is
AC-coupled to the terminal
box.
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24V DC
+
Distributor
–
250Ω
Magnetic
valve
AC power supply
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IM 01C25A01-01E