Wiring; Wiring Precautions; Connections Of External Wiring To Terminal Box - YOKOGAWA EJX110A Installation Manual

5.

Wiring

NOTE
For F Fieldbus, PROFIBUS PA, and Mod
OUNDATION
bus communication types, please refer to each
communication manual.
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
● Terminal Configuration
RTD cable connection*
Terminal
1
Terminal
*For EJX9A only.
● Terminal Wiring for 4 to 20 mA output
+
1
Power supply and output terminals
SUPPLY
–
2
+
3
External indicator (ammeter) terminals
CHECK
–
2
or
+
Status contact output terminals
3
ALARM
–
2
(when /AL is specified)
Ground terminal
*1: When using an external indicator or check meter, the
internal resistance must be 10 Ω or less. A check meter
or indicator cannot be connected when /AL option is
specified.
*2: Not available for F
OUNDATION
PA communication types.
● Terminal Wiring for 1 to 5 V output
+
1
Power supply terminals
SUPPLY
–
2
1 to 5 V DC with HART communication
+
3
VOUT
–
terminals
2
Ground terminal
● Terminal Wiring for 4 to 20 mA output
[EJX9A]
+
1
SUPPLY Power supply and output terminals
–
2
+
3
CHECK External indicator (ammeter) terminals
–
2
+
4
PULSE Pulse or status contact output terminals
–
2
Ground terminal
*1: When using an external indicator or check meter, the
internal resistance must be 10Ω or less.
*2: Not available for F
OUNDATION
type.
Figure 5.2 Terminal
40
Terminal [B]*
4
Terminal [A]
3
2
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*1*2
or
*2
Fieldbus and PROFIBUS
*1*2
*2
Fieldbus communication
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IM 01C25A01-01E