Connecting Ring-Lug Type Wires; Connecting Protective Earthing - ABB SMU615 Installation Manual

Section 5
Connecting
5.2.1
5.3
38
See the application manual for product-specific connection diagrams.

Connecting ring-lug type wires

Ring-lug type insulated terminal can be used for signal connector X120. The
maximum outside diameter for the M4 ring-lug type terminals is 9 mm.

Connecting protective earthing

The earth lead must be at least 6.0 mm
cross section of the wire must be increased.
Use fine copper wire as the earth lead.
1. Loosen the protective earth screw (T20) to connect a separate earth protection
lead.
The earth lead should be as short as possible but extra length is
required for door mounting.
Each merging unit must have its own earth lead connected to the
earth circuit connector.
2. Connect the earth lead to the earth bar.
Use either stripped wire screwed between a washer cup and the protective earth
screw or a ring lug.
Select a suitable ring lug to fit under the M4 screw.
3. Tighten the protective earth screw.
4. Support the earth lead so that it cannot break or weaken.
Be aware of the mechanical, chemical and electrochemical environment.
1MRS758405 C
2
. If the earth lead is long, the
SMU615
Installation Manual