Yokogawa EJA115 - Manual (Page 25)

<5. Wiring>
23
IM 01C22A01-01E
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
waterproofi ng 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 specifi c 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 CENELEC and IECEx
fl
ameproof type transmitters. When the shrouding
bolt is driven clockwise by an Allen wrench, it is
going in and cover lock is released, and then 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
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
–
+
Transmitter terminal box
F0502.ai
Figure 5.1 Power Supply Wiring Connection
5.2.2 Handheld Terminal Connection
Connect the handheld terminal to the SUPPLY + and
– terminals (Use hooks). Communication line requires a
reception resistor of 250 to 600
Ω in series.
Transmitter terminal box
BT200 etc.
F0503.ai
Power supply
–
+
Ignore the polarity
since it is AC-coupled
to the terminal box.
250 to 600
Ω
Figure 5.2 Handheld Terminal Connection
5.3 Wiring
CAUTION
For the intrinsically safe equipment and fl ameproof
equipment, wiring materials and wiring work for these
equipment including peripherals are strictly restricted.
Users absolutely must read “Installation and Operating
Precautions for TIIS Intrinsically Safe Equipment”
and “Installation and Operating Precautions for TIIS
Flameproof Equipment” at the end of this manual prior
to the work.
W
iring
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