PDS51 Series
- 40 -
Code
Description
Possible Causes
Solutions
Lou
Well low level
alarm
The low water level
probe
（
or float switch
）
terminals of the water
inlet is losed ,connecting
DI2 and GND terminals
Check if the well is short of water
FUL
Water tank full
alarm
The high water level
float switch terminals of
the water outlet tank is
closed ,connecting DI3
and GND terminals
Check if the water tank is full
Table 6-1-1 Error Code Description
6.2 Troubleshooting and Countermeasures
Item
Phenomenon
Possible Causes
Solutions
1
No display
when power
on
Improper input power
Check if the input voltage is within the
specified range
The cable connecting the
control board and the screen
is in poor contact
Re-plug the cable
The internal components of
the controller are failed
Seek for technical support
2
Pump cannot
run
Insufficient input power
(insufficient light)
Increase the power of panels or wait until
the light is sufficient before restarting
Motor failed or stuck
Replace motor or clear mechanical issue
Improper wirings
Re-confirm whether the wirings between
the controller and the motor is correct
3
DI terminal
failure
Incorrect parameter settings
Check and reset the F5 team related
parameters
Abnormal external signal
Reconnect the external signal wire to
eliminate the external input fault
Control board failure
Seek for technical support
4
Interrupt-ion
from
controller
Improper carrier frequency
Properly reduce the carrier frequency
Improper grounding
Effectively ground the inverter and
motor, and separate them from the
grounding of peripheral equipment
Too long cables between
controller and motor
Install output reactor or reduce cable
length
5
Big noise of
motor
Motor damaged or
mechanical failure
Replace motor or clear mechanical issue
