11
Signal Port Status
Signal
Water
level status
Remote Float Switch (1)
Remote Float Switch
(2)
S1
S2
S3
Normal Level
Open
Open
Close
Low Level
Close
Open
Open
High Level
Open
Close
n/a
Remote float switch (1):
It’s to prevent water tank overflow or underflow by sensing a remote float switch in water tank. When water
level is normal, it will keep DI1 & COM2 and DI2 & COM2 in open status. When water level is high in water tank,
it will receive high-level signal (open status on DI1 & COM2 and closed status on DI2 & COM2) from float
switch and stop the inverter. When water tank is in low level, it will receive low-level signal (closed status on
DI1 & COM2 and open status on DI2) from float switch and start up the inverter. This action is only available
when the auto turn-on function is enabled. If the water level is normal, DI1 and COM2 are normally in open
status.
Remote float switch (2):
It’s to prevent the water pump dry running by connecting to remote float switch. The length of connecting wire
should not longer than 50m. If the water level is normal in the well, COM1 and DI3 (S3) is kept in normal close
status. If the water level is low in the well, COM1 and DI3 (S3) will be open status. If open status is detected
for COM1 and DI3 (S3), the inverter will automatically shut down in two seconds and show alarm. If closed
status is detected for COM1 and DI3 (S3) again, the inverter will automatically turn on in two seconds and clear
the alarm. And this automatic turn-on action only be effective when program P4.01 is set up as “1”. If this port
is not connected to water level probe, be sure to connect COM1 and DI3 together. It’s default setting from
factory.
COMMISSIONING
Step 1: Check the following requirements before commissioning:
Ensure all wires are firmly and correctly connected
Use a megger to check insulation of motor and wires
Check if the open circuit DC voltage of PV module meets requirement
Step 2: Switch on DC breaker or AC breaker and provide power to the inverter. Then, LCD screen will show 0.00.
Please set up the parameters of the inverter such as rated power, rated frequency, rated current and rated
voltage. For the detailed setting, please check “Parameter setting” section in Operation chapter.
Step 3: Press “RUN” button to activate the inverter. If the output frequency or water yield is low, it may be
wrong for output wire connection. Please exchange any two wires connected to the motor. Please be sure the
output frequency and water yield are normal. It means the wire connection is correct and complete.
