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APC615 Pump Unit Controller User Manual
APC615 Pump Unit Controller Version 1.0 2017-10-20 Page 46 of 54
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 has DC current) or add
resistance-capacitance return circuit (when coils of relay has AC current), in order to prevent disturbance
to controller or others equipment.