16 | SAMLEX AMERICA INC.
3.1 EMI AND FCC COMPLIANCE
These inverters contain internal switching devices that generate conducted and radiated
electromagnetic interference (EMI). The EMI is unintentional and cannot be entirely
eliminated. The magnitude of EMI is, however, limited by circuit design to acceptable
levels as per limits laid down in North American FCC Standard FCC Part 15(B), Class B.
These limits are designed to provide reasonable protection against harmful interfer-
ence when the equipment is operated in a residential environment. These inverters can
conduct and radiate radio frequency energy and, if not installed and used in accordance
with the instruction manual, may cause harmful interference to radio communications.
3.2 REDUCING EMI THROUGH PROPER INSTALLATION
The effects of EMI will also depend upon a number of factors external to the inverter
like proximity of the inverter to the EMI receptors, types and quality of connecting wires
and cables etc. EMI due to factors external to the inverter may be reduced as follows:
3.2.1 EMI due to factors external to the inverter may be reduced as follows:
- Ensure that the inverter is firmly grounded to the ground system of the building or
the vehicle
- Locate the inverter as far away from the EMI receptors like radio, audio and video
devices as possible
- Keep the DC side wires between the battery and the inverter as short as possible.
- Do NOT keep the battery wires far apart. Keep them taped together to reduce
their inductance and induced voltages. This reduces ripple in the battery wires and
improves performance and efficiency.
- Shield the DC side wires with metal sheathing / copper foil / braiding:
- Use coaxial shielded cable for all antenna inputs (instead of 300 ohm twin leads)
- Use high quality shielded cables to attach audio and video devices to one another
- Limit operation of other high power loads when operating audio / video equipment
SECTION 3 |
Limiting Electro-Magnetic
Interference (EMI)
