LTH Electronics HPT63, Руководство по эксплуатации

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2 Safety & EMC
3
2 Safety & EMC
This chapter describes how to install and mount the panel-mounting and surface-
mounting versions, and how to connect the unit to a power source and auxiliary
equipment.
Although today’s electronic components are very reliable, it should be anticipated in
any system design that a component could fail and it is therefore desirable to make
sure a system will
fail safe . This could include the provision of an additional
monitoring device, depending upon the particular application and any consequences
of an instrument or sensor failure.
2.1 Wiring Installation
The specified performance of the HPT63 is entirely dependent on correct installation.
For this reason, the installer should thoroughly read the following instructions before
attempting to make any electrical connections to the unit.
WARNING!
: ALWAYS REMOVE THE MAIN POWER FROM THE SYSTEM
BEFORE ATTEMPTING ANY ALTERATIONS TO THE WIRING. ENSURE THAT
BOTH POWER INPUT LINES ARE ISOLATED. MAKE SURE THAT THE POWER
CANNOT BE SWITCHED ON BY ACCIDENT WHILST THE UNIT IS BEING
CONNECTED. FOR SAFETY REASONS AN EARTH CONNECTION MUST BE
MADE TO THE EARTH TERMINAL OF THIS INSTRUMENT.
ADHERE STRICTLY TO LOCAL WIRING AND SAFETY REGULATIONS WHEN
INSTALLING THIS UNIT. SHOULD THESE REGULATIONS CONFLICT WITH
THE FOLLOWING INSTRUCTIONS, CONTACT LTH ELECTRONICS OR AN
AUTHORISED LOCAL DISTRIBUTOR FOR ADVICE.
To maintain the specified levels of Electro Magnetic Compatibility (EMC,
susceptibility to and emission of electrical noise, transients and radio frequency
signals) it is essential that the types of cables recommended within these instructions
be used. If the installation instructions are followed carefully and precisely, the
instrument will achieve and maintain the levels of EMC protection stated in the
specification. Any equipment to which this unit is connected must also have the
same or similar EMC control to prevent undue interference to the system.
♦
Terminations at the connectors should have any excess wire cut back so that a
minimal amount of wire is left free to radiate electrical pick-up inside or close to
the instrument housing.
Note: The use of CE marked equipment to build a system does not necessarily
mean that the completed system will comply with the European requirements
for EMC.
2.2 Noise suppression
In common with other electronic circuitry, the HPT63 may be affected by high level,
short duration noise spikes arising from electromagnetic interference (EMI) or radio