8
a. Digital Input：To enable external speed control, connect one of the digits from Di1/2/3/4
to COM. See schematic as below:
b. Relay Output: Connect terminal L & N to enable external control. An additional on-offRelay
is necessary while bearing power is less than 500W (2.5A). See schematic as below:
c. RS485: To enable external control pump running capacity, connect terminal A and B, via
Modbus485 communication protocol.
8. TROUBLE SHOOTING
Relay external control output
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