Emc Considerations; Cabling; Connectors - Honeywell Vertex M Technical Handbook

Vertex M 24-Point Continuous Monitor
TM

EMC Considerations

Your Honeywell Analytics monitor has been designed
to comply with applicable Electromagnetic Compatibility
(EMC) standards at the time of manufacture. The design
includes filtering, shielding and bypassing techniques.
At the time of certification, simulated customer Input/
Output (I/O) schemes were tested.
All methods used in your equipment for emission
suppression and reduction of susceptibility are
interactive. Modifications to the instrument could result
in increased emissions and higher vulnerability to other
radiated fields.
Following the guidelines in this EMC Considerations
section will ensure your instrument maintains the
highest degree of EMC integrity. The guidelines listed
apply only to I/O emissions and do not apply to A.C.
and D.C. instrument power connections.
Vertex M Technical Handbook
TM

Cabling

At a very minimum, all cables should include a braided
shield. Ideal results have been obtained with twisted
pair cabling which has a foil shield surrounding each
pair plus foil and 90% braid shielding around the bundle.
In addition, ensure local electrical code requirements
are met.
The following cable parameters must be considered:
Braid
Must have a minimum 90% coverage
When used with braid, provides 100% coverage
Foil
Do not use foil alone. It has a tendency to break.
Twisted Pair Provides for cancelling of magnetic fields
Stranded Pair Provides the greatest surface area
Continuation of the shield to the cabinet earth
ground is most important. For discrete wire
terminations, pigtails to the cabinet (connector)
Shield
ground should be extremely short (absolutely no
Termination
greater than three inches). For multiconductor
connector terminations, only 360° shielded
shells should be used.
Note:
Honeywell Analytics product testing uses >90% braid
with foil (around the bundle); twisted pair; stranded 24
AWG (minimum wiring for all qualification and certifi-
cation testing.)

Connectors

All qualification and certification of Honeywell Analytics
products were achieved with high quality connectors,
providing 360° shield coverage. These connectors
generally had metal shells.
Failure to properly secure the connector to the
equipment will result in high emission levels. Also,
poorly constructed or improperly assembled connectors
can be a high source of radiated noise and provide a
path for external signals into the monitor.
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