Rockwell Automation 140G-Rx Installation Instruction-140G-R - Manual (Page 6)

DIR 1000682R0002 (L5757)
(6)
Positioning the first anchor plate of the busbars
Anchoring to the switchboard
Fig. 11
5.2.3 Assembly procedures for the connection busbars
Check the state of the contact surfaces of the connections very carefully: they must be very clean and free from burrs, dents and traces of rust
- which must be removed with a fine file or emery cloth to prevent localized increases in temperature. On completion of the operation, remove
any traces of grease or dust with a cloth soaked in a suitable solvent.
When aluminium connections are used, the contact surfaces must be tin-plated.
Make sure that the connections are unable to exert any strain on the terminals in any direction.
Always insert a flat washer with a large diameter (to distribute the tightening pressure over the widest possible area) and a spring washer.
Establish contact between the connection and terminal and fully tighten the fixing screws.
Always use two wrenches (to prevent the insulating parts from being unduly stressed) and apply the tightening torque of the main terminals = 70
Nm/615 lb in for M12 high-strength screws. Check tightness after 24 hours.
5.2 Wiring of the auxiliary circuits of the circuit-breaker
There is a special terminal board fitted with screw terminals for connecting the auxiliary circuits.
The terminals are marked with alphanumerical identification codes as indicated in the electrical circuit diagram.
The terminal board is accessed immediately when the compartment door is opened.
Fig. 12
190
190 190
190
190
190
7.48"
7.48"
7.48"
7.48"
7.48"
7.48"