Yokogawa EJA530A - Manual (Page 25)

IM 01C21F01-01E 6-1
6. WIRING
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 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 CENELEC and
IECEx flameproof type transmitters. When the
shrouding bolt is driven clockwise by an Allen
wrench, it is going in and cover lock is re-
leased, and then the cover can be opened by
hand. See Subsection 9.4 “Disassembly and
Reassembly” for details.
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 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.
Power supply
–
+
Transmitter terminal box
F0601.EPS
Figure 6.3.1 Power Supply Wiring Connection
6.3.2 External Indicator Connection
Connect wiring for external indicators to the CHECK +
and – terminals.
(Note) Use a external indicator whose internal resistance is 10 Ω or
less.
Transmitter terminal box
External indicator
F0602.EPS
Power supply
–
+
Figure 6.3.2 External Indicator Connection
6.3.3 BRAIN TERMINAL BT200 Connec-
tion
Connect the BT200 to the SUPPLY + and – terminals
(Use hooks). The communication line requires a
reception resistor of 250 to 600
Ω in series.
Transmitter terminal box
BT200
F0603.EPS
Power supply
–
+
Ignore the polarity
since the BT200 is
AC-coupled to the
terminal box.
Figure 6.3.3 BT200 Connection