Wiring; Wiring Precautions; Selecting The Wiring Materials; Connections Of External Wiring To Terminal Box - YOKOGAWA DpharpEJX vigilantplant EJX110 User Manual

6.

WIRING

6.1 Wiring Precautions

IMPORTANT
• Lay wiring as far as possible from electrical
noise sources such as large capacity transform-
ers, motors, and power supplies.
• Remove the electrical connection dust cap
before wiring.
• All threaded parts must be treated with water-
proofing 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 shroud-
ing bolt is driven clockwise using an Allen
wrench, it goes in. The cover lock can then be
released and the cover can be opened by
hand. See subsection 8.4 "Disassembly and
Reassembly" for details.
• Plug and seal an unused conduit connection.
6.2 Selecting the Wiring Materi-
als
(a) Use stranded leadwires or cables which are the
same as or better than 600 V grade PVC insulated
wire (JIS C3307) or its equivalent.
(b) Use shielded wires in areas that are susceptible to
electrical noise.
(c) In areas with higher or lower ambient temperatures,
use appropriate wires or cables.
(d) In environment where oils, solvents, corrosive gases
or liquids may be present, use wires or cables that
are resistant to such substances.
(e) It is recommended that crimp-on solderless terminal
lugs (for 4 mm screws) with insulating sleeves be
used for leadwire ends.
6.3 Connections of External
Wiring to Terminal Box

6.3.1 Power Supply Wiring Connection

Connect the power supply wiring to the SUPPLY +
and – terminals. When /AL is specified, also refer to
subsection 6.3.5.
Power supply
Figure 6.1 Power Supply Wiring Connection

6.3.2 External Indicator Connection

Available only when /AL is not specified.
Connect wiring for external indicators to the CHECK +
and – terminals.
(Note) Use a external indicator whose internal resistance is 10
less.
Power supply
+
–
Transmitter terminal box
Figure 6.2 External Indicator Connection

6.3.3 Communicator Connection

Connect the BT200 or HART275 HHT to the SUPPLY
+ and – terminals. (Use hooks.)
Transmitter terminal box
BT200
Figure 6.3 BT200 Connection
6-1
6. WIRING
Transmitter terminal box
+
–
External indicator
+
Power supply
–
Ignore the polarity
since the BT200 is
AC-coupled to the
terminal box.
IM 01C25B01-01E
F0601.EPS
or
F0602.EPS
F0603.EPS