Second Level Maintenance Operations; Warnings; General Inspections And Cleaning; Circuit Breaker Connections And Connections Between Circuit Breaker And Switchboard - Allen-Bradley 140G-R Installation Instructions Manual

8.4

Second Level maintenance operations

8.4.1

Warnings:

WARNING RISK OF ELECTRICAL SHOCK
IMPORTANT NOTE: before performing any maintenance operation:
!
- Turn circuit breaker to the OFF position. Make sure springs of the operating mechanism are discharged.
- Remove power from Power and Control terminals and visibly ground line side and load side terminals.
Rockwell Automation declines any responsibility for the injury of people or property damage resulting from the failure to comply
with the instructions set out in this document.
Installation putting into service routine and emergency maintenance shall be performed by qualifi ed personnel with detailed
knowledge of this device.
8.4.2

General inspections and cleaning:

- Check to make sure that the device (interrupting part) is clean. Remove any dust and traces of oil or grease with a clean, dry
cloth (use a mild detergent if necessary - A cleaning product such as Henkel's 273471 or equivalent can be used if there is a
heavy coating of dirt).
- Make sure that the rating plates with the technical specifi cations of the apparatus are affi xed
- The nameplate can be cleaned with a clean, dry cloth.
- Remove all traces of dust, mold, condensation and tarnish
- Inspect for traces of overheating or cracks, wich could create conductive paths across isolating devices.
- Inspect for and remove any foreign bodies inside of the breaker assembly.
- Inspect and check the torque on the eight mounting bolts attaching the circuit-breaker to the panel (M8 - 221 lb-in / 25 Nm).
8.4.3

Circuit breaker connections and connections between circuit breaker and switchboard

- Remove any dust and dirt from the isolating parts with a brush and dry cloth (use a mild cleaning product if necessary - A
cleaning products such as Henkel's 273471 or equivalent can be used if there is a heavy coating of dirt).
- Make sure that there are no traces of localized overheating on the terminals. This problem is denoted by the change in the color
of the parts in contact. These parts are usually silvery in color.
- Make sure that the bolts of the terminal connections are tightened (M12 - 619.5 lb-in / 70 Nm).
- Make sure that the control circuit and fi eld connection screws are tightened in the terminal boxes (6.19 lb-in / 0.7 Nm).
8.4.4

Circuit-breaker Cover and Side Guards disassembly

– Make sure the circuit-breaker has been disabled, as described in sec. 8.4.1
– Open the Clear Door (1) on the Trip Unit as shown in fi gure 26.
– Remove the Breaker Cover (2) by removing the four screws (3).
– Remove both the Side Guards (4) by removing the mounting screws (5).
4
5
1
3
2
Fig. 26
DIR 1000682R0002 Version 03
5
1
3
3p
2
(17)
4
4p