Yokogawa EJA110E User Manual download pdf (Page 31)

<6. Wiring>

6-1

IM 01C25B01-01E

6. Wiring

6.1 Wiring Precautions

IMPORTANT

• Lay wiring as far as possible from electrical

noise sources such as large capacity

transformers, motors, and power supplies.

• Remove the electrical connection dust cap

before wiring.

• All threaded parts must be treated with

waterproo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 speci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 ATEX

ameproof type transmitters. When the

shrouding 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

Materials

(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.

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 specied, also refer to

subsection 6.3.5.

Power supply

–

Transmitter terminal box

F0601.ai

SUPPLY

PULSE

CHECK

ALARM

Figure 6.1 Power Supply Wiring Connection

6.3.2 External Indicator Connection

Available only when /AL is not specied.

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.ai

Power supply

–

SUPPLY

PULSE

CHECK

ALARM

Figure 6.2 External Indicator Connection

6.3.3 Communicator Connection

Connect the BT200 or HART Communicator to the

SUPPLY + and – terminals. (Use hooks.)

SUPPLY

PULSE

CHECK

ALARM

Transmitter terminal box

BT200

F0603.ai

Power supply

–

Ignore the polarity since the

BT200 is AC-coupled to the

terminal box.

Figure 6.3 BT200 Connection

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Yokogawa EJA110E User Manual Page 31

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