Daewoo ST Series Instruções de Operação Página 139

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4. Electromagnetic Compatibility (EMC)
The governor system can be adversely affected by large interfering signals that are conducted
through the cabling or through direct radiation into the control circuits.
All speed control units contain filters and shielding designed to protect the units sensitive circuits
from moderate external interfering sources.
Although it is difficult to predict levels of interference, applications that include magnetos, solid
state ignition systems, radio transmitters, voltage regulators or battery chargers should be
considered suspect as possible interfering sort traces.
If it is suspected that external fields, either those that are radiated or conducted, are or will affect
the governor systems operation, it is recommended to use shielded cable for all external
connections.
Be sure that only one end of the shields, including the speed sensor shield, Is connected to a single
point on the case of the speed control unit. Mount the speed control unit to a grounded metal back
plate or place it in a sealed metal box.
Radiation is when the interfering signal is radiated directly through space to the governing system
To isolate the governor system electronics from this type of interference sort roe, a metal shield or
a solid metal container is usually effective.
Conduction is when the interfering signal is conducted through the interconnecting wiring to the
governor system electronics. Shielded cables and installing filters are common remedies.
As an aid to help reduce the levels of EMI of a conductive nature, a battery line filter and shielded
cables are conveniently supplied by KT130. To reduce the levels of EMI of a radiated nature, a
shielded container P/N CA114 can be sourced from GAC and its distributors.
In severe high energy interference locations such as when the governor system is directly in the
field of a powerful transmitting source, the shielding may require to be a special EMI class
shielding. For these conditions, contact GAC application engineering for specific
recommendations.
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