Wiring; General; Power, Alarm, And Output Wiring - Emerson Rosemount 54eA Manual

MODEL 54eA
The Model 54eA analyzer leaves the factory configured for use with the Model 499ADO sensor
(ppm dissolved oxygen). If a 499ADO sensor is NOT being used, turn to Section 5.5 and con-
figure the transmitter for the desired measurement (ppb oxygen, oxygen measured using a
steam-sterilizable sensor, free chlorine, total chlorine, monochloramine, or ozone) before wiring
the sensor to the analyzer. Operating the analyzer and sensor for longer than five minutes while
the analyzer is improperly configured will greatly increase the stabilization time for the sensor.
Be sure to turn off power to the analyzer before wiring the sensor.

3.1 GENERAL

Electrical installation must conform to the National Electrical Code, all state and local codes, and all plant
codes and standards for electrical equipment. Electrical installation and wiring must be done by qualified
personnel.
The five holes in the bottom of the instrument case accept 1/2-in. strain relief connectors or conduit fittings. The
rear openings are for power and alarm relay wiring. The left front opening is for sensor wiring and the right front
opening is for analog output wiring. Seal unused openings with conduit plugs.

3.2 POWER, ALARM, AND OUTPUT WIRING

Refer to Figure 3-1. Make power and alarm connections on TB3. Make analog output wiring connections on TB2. For
access to power and alarm terminals, loosen the screw holding the protective cover in place and remove the cover.
Alarm contacts are dry (i.e., not powered) and are normally open. Refer to Section 1.0 for relay specifications.
For best EMI/RFI protection, shield the output cable and enclose it in an earth-grounded, rigid, metal conduit.
Connect the outer shield of the output cable to the earth ground connection on TB2 (see Figure 3-1).
Keep sensor and output signal wiring separate from power wiring. Do no run sensor and power cables in the same
conduit or close together in a cable tray.
AC wiring must be 14 gauge or greater. Be sure to connect earth ground from the power cable to the nearby
ground lug. A good earth ground is necessary for proper operation of the controller. Provide a switch or breaker to
disconnect the analyzer from the main power supply. Install the switch or breaker near the analyzer and label it as
the disconnecting device.
AC connections and grounding must comply with UL 508 or local electrical code. DO NOT apply
power to the analyzer until all electrical connections are verified and secure.
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SECTION 3.0

WIRING

NOTE
WARNING
DANGER
Live voltages may be present.
Will cause severe injury or death.
WARNING: RISK OF ELECTRICAL SHOCK
SECTION 3.0
WIRING