16
SCAIME Manual : NU-eNod4C-E-0418-196712-F.docx
4.1
Cabling basic rules
4.1.1
Prevent Electrostatic Discharges
For ESD protection, cabling for the analog load cell must include a ferrite and a silicone protection sleeve, not included
with the transmitter.
Install the ferrite by passing the analog cell connection through the ferrite and wrapping it around once, as shown on
the following picture:
4.1.2
Prevent Electromagnetic disturbances
Observe these basic rules to guard against Electromagnetic disturbances.
Rule 1:
Large area grounding contact
•
When installing the devices, make sure that the surfaces of inactive metal parts are properly bonded to chassis
ground (see following sections).
•
Bond all inactive metal parts to chassis ground, ensuring large area and low-impedance contact (large cross-
sections).
•
When using screw connections on varnished or anodized metal parts, support contact with special contact
washers or remove the protective insulating finish on the points of contact.
•
Wherever possible, avoid the use of aluminium parts for ground bonding. Aluminium oxidizes very easily and
is therefore less suitable for ground bonding.
•
Provide a central connection between chassis ground and the ground/protective conductor system.
Rule 2:
Proper cable routing
•
Organize your wiring system into cable groups (high-voltage/power supply/signal/measurement/data cables).
•
Always route high-voltage and data cables in separate ducts or in separate bundles.
•
Install the measurement cables as close as possible to grounded surfaces (e.g. supporting beans, metal rails,
steel cabinet walls).
