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6.11 DO Connection
The inverter has one DO relay with multiple functions as follows:
• Consumer load control. In this case the DO relay will control a contactor that will open or
close in certain condition. Please choose the appropriate contactor according to the load
power, e.g. the contactor types of the 3TF30 series from SIEMENS (3TF30 01- 0X).
• Earth fault alarm. In this case, the additional equipment required is a light indicator and/
or a buzzer.
Relay Trigger condition Description
Consumer load
control
The load control mode
has been set via the iSo-
larCloud App.
The relay is activated once the conditions
of the control mode are satisfied. See
"8.12.10 Load Control".
Earth fault alarm The earth fault occurs.
Once the inverter receives the earth fault
signal, the relay closes the contact. The
relay remains triggered until the fault is re-
moved. See "8.12.13 Grounding
Detection".
• A DC signal of max 30V/3A or an AC contactor must be installed between the in-
verter and appliances. It is forbidden to connect the load directly to the DO port.
• The current of the DO dry contact should not be larger than 3 A.
• The DO node is not controlled once the inverter is powered off. Connect the AC
contactor by the manual switch, so as to control the loads.
Procedure
For detailed connection description of the DO cable, refer to the section "6.7.3 RS485 Con-
nection". Plug the wires into the DO terminal according the labels on the bottom of the
inverter.
6 Electrical Connection User Manual
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