EM12-SP User Manual
3. Installation of Frequency Inverter
11
The wiring for floater water-level switch mounted on a side
The floater water-level switch mounted on a side is the normally open contact to output and its common
wire is connected to the terminal COM of EM12-SP inverter. At the same time, the low level-water wire is
connected to terminal DI4 and the high water-level wire is connected the terminal DI5.
EM12-SP
EM12-SP
EM12-SP
EM12-SP
DI5
Low water-level
High water-level
COM
DI5
COM
DI4
COM
DI4
COM
Detector switch of
high water-level
Detector switch of
low water-level
Detector switch of
high water-level
Detector switch of
low water-level
Diagram3-8
Diagram of
Low water level and high water level
Remarks:
When the actual water-level in the reservoir is lower than horizontal line of low water-level, DI4 and DI5
will be disconnected from the COM as well as controller automatically strat the pum. On the contrary, if the
actual water-level is higher than the horizontal line of high water-level, DI4 and DI5 will be connected to
COM as well as controller automatically stop the pump to prevent water overflow.
Notice:
1. If only use one detection signal of water-level in the reservoir, DI4 and DI5 must be connected together
by conductor.
