Sungrow SG250HX-IN-20, Руководство пользователя

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In case of PLC communication, the AC cable must be a multi-core cable
rather than multiple single-core cables.
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The PLC Module is an optional device that can be ordered from Sungrow.
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The PLC Module conducts data communication by directly using the AC
output cable of the inverter and thus saves the trouble to lay and maintain
the special communication cables. The RS-485 port of the PLC Module
supports the transparent transmission of the MODBUS-RTU and is
completely compatible with the monitoring devices and software of the
original RS-485 communication method.
5.11 Dry Contact Connection
Dry contact cables require a cross section of 1 mm 2 to 1.5 mm 2 .
The connection procedure of the dry contact is the same as that of the RS485
terminal block.
5.11.1 Dry Contact Function
The configuration circuit board is provided with fault output dry contact and emergency
stop dry contact, as shown in the figure below.
Connection method of the dry contacts is similar to that of the RS485 terminal block.
D DO O tte errm miin na all ((ffa au ulltt o ou uttp pu utt d drryy c co on ntta ac ctt)):: the relay can be set to fault alarm output, and
user can configure it to be a normal open contact (COM＆NO) or a normal close contact
(COM＆NC).
The relay is initially at the NC terminal, and it will trip to another contact when a fault
occurs.
5 Electrical Connection User Manual