Connecting Analog Signals; Connecting Current And Voltage Inputs - ABB RELION REX610 Installation Manual

Section 5
Connecting
5.4
5.4.1
36
Select a suitable ring lug to fit under the M3 screw.
3. Tighten the functional earth screw.
The allowed tightening torque is 0.75 Nm ± 10% (0.55 ft lb ± 10%).
4. Use the lower functional screw to earth the RS-485 shield wire in the RS-485
cable when hard earth shielding is required.
To avoid earth loops, another capacitive coupled earth pin
(pin-4) of RS-485 can be used to connect the cable shield on
another RS-485 connected relay on the same bus.
Shielded Ethernet cables are recommended.
5. Support the earth lead so that it cannot break or weaken.
Be aware of the mechanical, chemical and electrochemical environment.

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. Unscrew the ring-lug connector cover to access the ring-lug terminals.
2. Remove the fixing screw.
3. Slide the screw through the terminal lug and screw it back on.

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 for CTs/VTs is dimensioned for one 6.0 mm
wire or for two wires of maximum 4.0 mm
The allowed tightening torque for the compression
connector wire clamp is 0.60...0.80 Nm (0.4425...0.5900
ft lb). The allowed tightening torque for the VT
connector wire clamp is 0.40...0.50 Nm (0.2950...0.3687
2NGA000821 A
2
(AWG 10)
2
(AWG 12).
Installation Manual
REX610