Emerson B-106-300NH instruction manual Fuse Replacement, Transformer Replacement

Instruction Manual

Appendix E Rev. 4.5 June 1999

World Class 3000

SERVICE AND NORMAL MAINTENANCE

E-5 OVERVIEW

This section describes service and routine maintenance of the Intelligent Field Transmitter. E-7Replacement parts referred to are available

from Rosemount. Refer to Replacement Parts later in this appendix for part numbers and or- dering information.

Install all protective equipment covers and safety ground leads after equip- ment repair or service. Failure to in- stall covers and ground leads could result in serious injury or death.

E-6 FUSE REPLACEMENT

Power supply board (4, Figure E-6)contains four identical 5 amp fuses.

Perform the following procedure to check or re- place a fuse. In addition, 2 additional 5 amp fuses (F1 and F2) are included if the IFT unit has an internal heater installed.

Disconnect and lock out power before working on any electrical components. There is voltage up to 240 Vac, and could cause personal injury.

a.Turn off power to the system.

b.Open cover door (16) of the IFT by remov- ing screws (17).

c.Remove protective cover (13) by removing screws (14) and washers (15).

d.Unscrew fuseholder top and remove the fuse (5). After checking or replacing a fuse, reinstall the fuseholder top.

e.Replace protective cover (13) and secure with washers (15) and screws (14).

f.Close cover door (16) and secure with screws (17).

TRANSFORMER REPLACEMENT

Disconnect and lock out power before working on any electrical components. There is voltage up to 240 Vac, and could cause personal injury.

a.Turn off power to the system.

b.Open cover door (16) of the IFT by remov- ing screws (17).

c.Remove protective cover (13) by removing screws (14) and washers (15).

d.Disconnect cable (1) from the receptacle on microprocessor board (11). Disconnect GUI assembly cable from receptacles on micro- processor board if IFT is equipped with GUI.

e.Carefully tagging wires, remove the wires from terminal strip on interconnect board (12).

f.If unit is equipped with heater option, re- move thermoswitch assembly (18, 19, Figure E-8)by removing screws (13) and washers (14).

g.Remove mounting plate (10) by removing the necessary screws.

h.Disconnect transformer cable plugs from the receptacles on power supply board (4).

i.Remove transformer (9) from enclosure (6) by removing four screws (8).

j.Attach new transformer to enclosure (6) with four screws (8).

k.Connect the transformer cable plugs from transformer (9) to the receptacles on power supply board (4).

E-8 Appendices Rosemount Analytical Inc. A Division of Emerson Process Management