Instruction Manual

748213-S April 2002

Model 755R

2-5 ELECTRICAL CONNECTIONS

equipment from the analyzer power cable

 

(Refer to Figure 2-3 below).

WARNING

ELECTRICAL SHOCK HAZARD

For safety and proper performance, this instrument must be connected to a properly grounded three-wire source of supply.

Cable connections for AC power, recorder output, and alarm output are shown in Installation Drawing, 654015, and are explained in the following sections.

a.Line Power Connection

The analyzer is supplied, as ordered, for operation on 115 VAC or 230 VAC, 50/60 Hz. Ensure that the power source con- forms to the requirements of the individual instrument, as noted on the name-rating plate.

Electrical power is supplied to the ana- lyzer via a customer-supplied three-conductor cable, type SJT, mini- mum wire size 18 AWG. Route power ca- ble through conduit and into appropriate opening in the instrument case. Connect power leads to HOT, NEUT, and GND terminals on the I/O board. Connect ana- lyzer to power source via an external fuse or breaker, in accordance with local codes. Do not draw power for associated

If the analyzer is mounted in a protected rack or cabinet or on a bench, an accessory kit (P/N 654008) is available which provides a 10-foot North American power cord set and a liquid-tight feed through gland for the power cable hole. The kit also contains four enclosure support feet for bench top use.

b.Recorder Output Selection and Cable Connections

If a recorder, controller, or other output device is used, connect it to the analyzer via a number 22 or number 24 AWG two-conductor shielded cable. Route the cable into the case through the liquid-tight feed through gland in the Recorder Output opening (See Installation Drawing, 654015). Connect the shield only at the recorder end or the analyzer end, not to both at the same time because a ground loop may occur.

NOTE:

Route recorder cable through a separate cable gland (P/N 899329) or conduit not with power cable or alarm output cable.

Cable connections and output selection for potentiometric and current-actuated devices are explained below.

755R

Potentiometric

Analyzer

Recorder

 

Input

 

Terminals

Voltage Divider

(Verify polarity

is correct)

(Customer Supplied)

Position of Recorder Output

Minimum Permissible

Selector Plug

Resistance for R1 + R2

 

(ohms)

10 mV

1K

100 mV

10K

1 V

100K

5 V

2K

Figure 2-3. Connections for Potentiometric Recorder with Non-Standard Span

2-6

Installation

Rosemount Analytical Inc. A Division of Emerson Process Management