The earth lead should be as short as possible but extra length is
required for door mounting.
Each protection relay 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.
5.4
Connecting analog signals
A connection diagram is needed to connect the analog signals.
When using the ring-lug type for CT/VT terminals, follow these steps.
1.
Remove the fixing screw.
2.
Slide the screw through the terminal lug and screw it back on.
5.4.1
Connecting current and voltage inputs
•
Connect the wires from the CTs/VTs to the correct device according to the phase
order and the connection diagram.
•
Each terminal X115/X120 for CTs/VTs is dimensioned for one 0.5...6.0
mm
2
wire or for two wires of maximum 2.5 mm
2
.
•
Each terminal X130 for VTs is dimensioned for one 0.5...2.5 mm
2
wire.
See the application manual for the terminal diagrams and the
combinations of I/Os.
1MRS757641 E
Section 5
Connecting
620 series
37
Installation Manual
