YOKOGAWA EJX Series, User Manual

Page: 30 / 52

<5. Wiring>
28
IM 01C25A01-01E
5. Wiring
NOTE
For F
OUNDATION
Fieldbus and PROFIBUS PA
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
F0501.ai
Figure 5.1 Shrouding Bolt
• Plug and seal an unused conduit connection.
5.2 Connections of External
Wiring to Terminal Box
5.2.1 Power Supply Wiring Connection
Connect the power supply wiring to the and
– terminals.
Power supply
–
+
Transmitter terminal box
F0502.ai
SUPPL
Y
PULSE
CHECK
ALARM
Figure 5.2 Power Supply Wiring Connection
5.2.2 Configuration Tool Connection
Connect the configuration tool to the and
– terminals. (Use hooks.)
SUPPL
Y
PULSE
CHECK
ALARM
Transmitter terminal box
F0503.ai
Power supply
–
+
Ignore the polarity since
the configuration tool is
AC-coupled to the 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.
SUPPL
Y
PULSE
CHECK
ALARM
Transmitter
terminal box
Magnetic
valve
AC power supply
External power
supply 30V DC,
120mA max
+
–
250 Ω
24V DC
Use two-wire separately shielded cables.
Distributor
Shielded cable
F0504.ai
Figure 5.4 Status Output Connection