User Manual QT50 Doc ID 1321 version 2.0 Sept. 2018
Page 59 of 62
Earthing Methods in
Maritime Installations
All bare metal wires, screens or others not covered by the terminal shall be fully
covered in shrink tube to avoid unintended contact between wires, housing or
similar.
Only one conductor is allowed in each terminal of a terminal block/row for
external connections. This is not related to terminals as integrated part of
internal components (e.g. relays, contactors) of the equipment. Two conductors
may in certain cases be used in one approved type ferrule connected to one
terminal. Contact Eltorque for approval.
Summary:
PE Earth shall be connected to the PE Earth bar in the cabinet and at the
actuator housing. PE earth shall (if possible) not be routed via the PCB to the
housing but go directly. The PCB shall be earthed to the actuator housing
from own cable.
Outer braided screen shall be connected to PE earth at both ends. Heat Shrink
Tubing shall be used on visible wires inside actuator.
Inner Screen shall be connected to IE/IS earth in the control cabinet. The
other end shall be floating in the actuator (floating thru for several items in
same loop). Heat Shrink Tubing shall be used to isolate the inner screen and
make sure that it is not in direct contact with anything inside actuator.
Drawing references:
1. The inner screen needs to be terminated inside the actuator housing.
Products that doesn’t have enough terminals available in the connector
needs a separate connector. We recommend using Wago 221 or
equivalent.
2. It is important that the outer screen is cut and not connected to the
housing for the connection between two actuators on different power
loops. Shrink tube shall be used to cover all bare wires.
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