Ac Wiring; Radio Frequency Interference - Latronics PV Edge Grid Connect Instruction Manual

RADIO FREQUENCY INTERFERENCE

Radio Frequency Interference (RFI) is a phenomenon that exists in modern
society and is a problem in many areas of electronics. For Inverter users,
RFI normally presents itself in the form of static and/or interference when
listening to an AM radio and in unusual cases may interfere with TV reception.
Over the years Latronics has continued to invest significant time and effort in
the reduction of RFI related emissions from the entire product range, so that
they comply with the appropriate International and/or Australian Standards.
Even with this compliance, there are situations where RFI may still be a cause
for concern, and can differ greatly from installation to installation. Accordingly,
the following is a list of recommendations made to assist in the overall
reduction of RFI.
1. Separate DC and AC wiring.
same conduits and/or cable trenches. It is strongly recommended that
DC and AC wiring be separated by the greatest distance possible. In
extreme cases, the use of shielded conduit may be necessary.
2. Minimize length of DC cabling
therefore all such cables should be kept as short as is practicable. For
best performance minimize DC cable length to Inverter and Batteries and
if possible avoid the use of auxiliary DC loads.
3. 240Vac Earth . For household installations, it is recommended that a
"good" Earth Stake is located as nearby the Inverter as is possible.
4. AM and HF Radios. These types of radio equipment inherently suffer
from all forms of RFI, especially when the received signal level is weak.
In such cases reception can sometimes be improved by relocation of the
radio itself, alternatively the use of an appropriate external antenna and
co-axial cable may be necessary. External antennas should be located
in a manner that ensures maximum signal strength whilst affording the
greatest possible distance away from the Inverter and Batteries.
5. Televisions. TV signals are transmitted as FM waveforms. This type of
signal fundamentally reduces the effects of RFI, therefore the use of a
good antenna and feeder cable is normally sufficient to ensure quality
reception. Locating the television as far as possible from the Inverter may
also improve picture clarity.
Avoid running DC and AC cables in the
. DC cables can act as an aerial,
16

AC WIRING

Both models require an external 10A circuit breaker for protection of
inverter's AC input. Usually mounted in main switchboard. The active and
neutral of the AC output are electrically isolated from the DC inputs and earth
connections.
Latronics Inverters have the AC output (active and neutral) floating with
respect to the DC and Earth. This configuration provides the highest safety
and most flexibility for installation wiring. The earth
to the Inverter case and is suitable for
The unit is supplied with both male and female 20Amp Wieland Gesis
lockable AC connectors that can be disconnected under full load and
complies with AS4777 standards for an isolator at the inverter.
To install connectors read the following procedure.
1. Make sure Inverter is switched OFF before working on mains wiring. Turn
external AC Circuit Breaker switch into OFF position and
make sure it cannot be switched back on.
2. Test the wiring with a voltmeter to make sure no voltage is present.
3. Peel back 30mm of cable jacket and cut Active and Neutral cables
5mm shorter than Earth.
Round 2.5sqmm Twin & Earth Cable
4. Strip 5mm off all three cables.
5. Take the Wieland Gesis connector, disassemble into three main sections
and insert stripped wire through as shown below.
Socket
E is connected internally
MEN wiring.
30mm
Earth
Main Body
Pressure Ring
5