Smartgen HGM1790N User Manual page 30

All outputs of controller are relay contact output type. If need to expand the relays, please add
freewheel diode to both ends of expand relay's coils (when coils of relay have DC current) or,
increase resistance-capacitance return circuit (when coils of relay have AC current), in order to
prevent disturbance to controller or others equipment.
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AC INPUT
Current input of controller must be connected to outside current transformer. And the current
transformer's secondary side current must be 5A. At the same time, the phases of current
transformer and input voltage must correct. Otherwise, the current of collecting and active power
maybe not correct.
WARNING: When there is load current, transformer's secondary side is prohibited to open circuit.
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WITHSTAND VOLTAGE TEST
When controller had been installed in control panel, if need the high voltage test, please
disconnect controller's all terminal connections, in order to prevent high voltage into controller and
damage it.
HGM1790N Genset Controller User Manual Page 30 of 31