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APsmart RSD Installation Best Practices for SunSpec PLC
If the system uses 2 or more APsmart transmitters-PLCs, the following best practice methods are introduced to
ensure a successful installation. This documentation should be ignored if the system is only using single APsmart
Transmitter-PLC, or for any inverter suppliers which has solved SunSpec PLC crosstalk issue.
Cable tray installation method 1: Avoided
When multiple RSD systems use one cable tray, PLC signal crosstalk may occur due to its technology nature
when the transmitter signal passes through the powerlines. This crosstalk issue may cause the rapid shutdown
systems to be shut down or start operating abnormally.
Cable tray installation method 2: Required
A rapid shutdown system must use separate cable trays minimal 20cm apart to prevent PLC signal crosstalk from
the transmitter signal through the cables.
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The recommended interval between
Transmitter-PLCs more than 2 meters.
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Cable tray installation method 3: Recommend
Note:
1. The“Required”method only applies to the system that installed APsmart Transmitters-PLC.
2. The“Recommend” method only applies to the system that is experiencing SunSpec PLC signals
crosstalk issue.
3. It is not necessarily that all SunSpec RSD systems will experience PLC crosstalk issue, due to different
design and equipment suppliers, those installation best practices may help to improve or resolve it.
The cable tray cannot
completely isolate the
communication
crosstalk between the
power cables. The
closer the two cable
trays are, the more
likely communication
crosstalk is to occur
The cable trays for two
different rapid
shutdown systems
should be installed
as far apart as possible
Do not put all the PV+
or all the PV- together in
the same cable tray
PV+&PV- of a string
should be placed
in the same cable tray
Do not separate PV +
and PV - in a cable
tray
The PV +& PV - of
the same string
should be placed
as twisted-pair in
a cable tray
The longer the cable
tray is, the more likely
communication
crosstalk is to occur
If multiple rapid
shutdown systems use
the same cable tray,
the length of the cable
tray should be kept as
short as possible （less
than 3m）
600 Ericksen Ave NE, Suite 200 Seattle, WA 98110 | +1-737-218-8486 |
+1-866-374-8538 | [email protected] | APsmartGlobal.com
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