SUNWAY M XS 7500TL
INSTALLATION AND
PROGRAMMING INSTRUCTIONS
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The signal connection on pin 2 is optional, whereas the connection of all the other signals among the
connected inverters—including the ground signal (pin3)—is required.
Figure 82: CAN wiring diagram
The CAN communication rate is factory-set to 125 kbps and allows creating CAN buses with maximum
length equal to 200 m with cable cross-sections equal to or higher than 0.34 mm
2
(AWG 22). The chain must
be terminated at both ends with 120 Ω resistors.
Composition
Cable pair characteristic
impedance
(Ω)
Cable pair
capacity (nF/km)
Loop resistance per
cable pair
(Ω /km)
2x2x0.34 mm
2
or
1x2x0.34 mm
2
+ 1x0.34 mm
2
120
25
140
Table 33: Recommended specifications for CAN connection cable
It is recommended that stubs connecting the device to the input and output line be avoided in the multidrop
chain. However, if stubs
are required, their length shall be limited to maximum 0.3m (as recommended by
“CAN Physical Layer for Industrial Application – CiA 102”).
In order to reduce induced disturbance (Burst), a shielded cable is to be used. The shield is to be connected
to earth. The GND (ground) terminal of the connector is not earthed and is not to be confused with the shield.
Avoid inserting the communications cables into the same cable raceways as the cables for the connection to
the grid and the PV modules, in order to avoid interference. This procedure is forbidden by the standards in
force (LVD directive) when the grid conductors and the PV field conductors do not feature safety insulation
(double insulation or reinforced insulation).
It is therefore advisable to provide dedicated cable raceways for the cable of the CAN multidrop trunk line.
For more information and details on the CAN standard you can consult the following CAN CiA documents:
•
“CAN Physical Layer for Industrial Application – CiA 102”
•
“CAN Open recommendation – Cabling and Connector Pin Assignment – CiA 303”
5.3.3.1. Elettronica Santerno CAN Wiring Solution
Special kits for the creation of a CAN bus external to the inverter are available as an option. The CAN bus
external to the inverter may be required in multi-inverter plants connected to the LV grid.
The kits provided are listed below and may be purchased either as modular elements for the interconnection
of maximum 63 inverters belonging to the same PV plant, or as an individual solution fitting a three-
phase/single-phase PV plant.
SUNWAY
M XS
1*
SUNWAY
M XS
2
SUNWAY
M XS
N*
CANH
CANL
GND
SHIELD
(*) Inverters to be provided with a
termination
