DAYLIFF SUNFLO-X Installation instructions

SUNFLO-X
DC SOLAR SUBMERSIBLE PUMP
Installation &
Operating Manual

PUMP SPECIFICATIONS
1.
1
2.
SYMBOLS & WARNINGS 2
INDEX
© Davis & Shirtliff Ltd 2020
Contents herein are not warranted
3. INSTALLATION & WIRING 4
3.4 Enclosure Socket Description 6
3.5 External Socket Description 7
3.6 Water Level Switch
7
3.7 Earthing Instructions 8
4. OPERATION 10
4.1 Intial Setting before First Operations 10
4.3 View Current Operational Parameters
12
4.4 View or Modify the Control 13
4.5 Change Frequency during operation 13
4.6 Function Parameter Description 14
3.8 Panel Layout & Instructions 9
3.1 Pump Installation 4
3.2 Pump Lowering 5
3.3 Pump Operation 5
4.2 Display Status 11
5. TROUBLE SHOOTING 15
5.1 Fault Code Description & Counter Measure 15
5.2 Other Codes Description 16
5.3 Faulty Inquiry & Reset 16

SERVICE & MAINTENANCE
6.
19
6.1 Routine Inspection & Maintenance 19
6.2 Requirement of Inspection & Maintenance 19
TERMS OF WARRANTY
7.
20

1
1. PUMP SPECIFICATIONS
Helical Centrifugal
2
Average Daily Irradiation Values (Kwhr/m)
Graph 1
Jan Feb Mar Apr May Jun Jul Aug Sep
11
Oct Nov Dec
5.6
6.3 6.5
6.0 5.8 5.6 5.7 5.9
6.5
5.8
5.1 5.3
% Daily Output
Graph 2
6 7 8 9 10 12 13 14 15 16 17 18
Time (hrs)
13.5%
7%
10%
12%
13% 13%
12%
10%
7%
0%
2% 2%
0%
PUMP
DAYLIFF SUNFLO-X Range of pumps are high specification solar powered centrifugal and helical
rotor DC pumps specifically designed for borehole applications and feature a remote surface
mounted controller. Pumps are constructed principally from AISI 304 stainless steel and are
engineered to the highest standards to give serviceability, excellent efficiency, high reliability and
long life. Helical rotor type are supplied with spare rotor.
MOTOR
Pumps are fitted with Permanent Magnet brushless high efficiency, maintenance free DC motors
without integrated electronics specifically designed for maximum efficiency. They should be
powered by solar arrays configured to provide the input voltage required and sized at
approximately 130% of the rated motor power.
Insulation Class: F Enclosure Class: IP68 Speed: 3300rpm
CONTROLLER
Pumps are provided with matched controllers for monitoring, protecting and controlling pump
operations with the following features:-
• Protection against reverse polarity, overload and over temperature.
• Integrated MPPT (Maximum Power Point Tracking) with 99% energy conversion efficiency to
maximize module power output.
• Fully automatic operation and complete protection including low level control, dry running
Congratulations on selecting a Dayliff SunFlo-X Pump. They are
manufactured to the highest standards and if installed and operated
correctly will give many years of efcient and trouble free service.
Careful reading of this Installation Manual is therefore important,
though should there be any queries they should be referred to the
equipment supplier.
3
FLOW (m /hr)
PUMP HEAD (m)
00.5 1.5
20
40
60
80
12 2.5 3 3.5
100
120
140
SUNFLO-X 1200H
SUNFLO-X 600H
SUNFLO-X 1800C
160
180
200

2
2. SYMBOLS AND WARNINGS
Misuse will result in fire, serious injury to person or even death.
DANGER
Misuse may damage equipment or cause light to medium
injuries to a person.
WARNING
and over/under voltage.
• Enhanced pump start on low sun intensity.
• Easy trouble shooting, where fault code is displayed on LCD screen for fast identification
and problem solving.
• Enclosure Class: IP52
PUMP OUTPUTS
2
Performance curves are given at standard test conditions of 1000W/m solar irradiance and
0
25 C. Output will vary throughout the year depending upon prevailing irradiation levels. For
estimated daily outputs at continuous pumping multiply the indicated output at the duty point by
the daily irradiation given in Graph 1. For indicative purposes factors of 1.1 can be applied for
hot arid areas and 0.9 for temperate high altitude areas in the Tropics. Output will vary
throughout the day as a proportion of the estimated hourly irradiation as shown in Graph 2.
OPERATING CONDITIONS
Pumped Liquid: Thin, clean, chemically non-aggressive liquids with a sand content of less than
0.1%.
0
Maximum Liquid Temperature: 0-35 C
0 0
Controller Ambient Temperature: -20 C to +60 C
Max Immersion Depth: 250m
Minimum Borehole Diameter: 125mm
PUMP DATA
Model
SUNFLO-X 600H 0.6
1.2
1.8
Type kW A B CE H
Power Dimensions (mm)
Helical Rotor
SUNFLO-X 1800C
SUNFLO-X 1200H Helical Rotor
Max
Current
(A)
Max
Voltage
(VDC)
Required
MPP
Voltage
Weight
(kg)
Ø
15
15
15
150
200
200
60-120VDC
120-160VDC
120-160VDC
560
600
1040
351
358
389
209
242
651
32113
146
32113
146
40
113
146
202
202
202
244
284
284
16
20
24
Centrifugal
D D1
E
Ø

3
WARNING
Suitable for indoor installation with sufficient ventilation. Do
not install under direct sunlight and keep away from dust.
Wiring must be performed by a qualified electrical
professional.
WARNING
Input power must be isolated before wiring and connection.
WARNING
Earth terminal must be reliably grounded or else inverter
enclosure may be electrified.
WARNING
The selection of solar array, motor and inverter should be
compatible. In case of doubt, consult nearest Dayliff dealer.
Terminals should be tightly fastened or else there is risk of
arcing and fire.
CAUTION
CAUTION
Capacitor or phase-advanced LC/RC noise filter must not be
connected with inverter output.
NOTE
All wiring and connection should be correctly connected before
powering on, or else damage may occur to the controller or
cause fire.
DANGER
Do not install the inverter if it is damaged or with missing parts.
Otherwise may cause accidents.
WARNING
To ensure a good convective cooling effect, the inverter must be
installed vertically with at least 10 cm space left at the top and
bottom.
WARNING
WARNING
Before operation, function parameters should be adjusted
according to the steps indicated in this manual. These should
not be changed randomly, or else it may cause damage to the
equipment.

4
WARNING
The temperature of heat sink is normally high when inverter is
running and it should not be touched or else it may cause burns.
WARNING
For areas with altitude over 2000m, the inverter output current
should be derated at 10% for every 1500m increase in height.
Maintenance and inspection must be performed by a qualified
technician.
The inverter should not be disassembled during operation. It
must be powered off atleast 5 minutes before conducting
maintenance and inspection to avoid the residual voltage of
electrolytic capacitor in major loop causing injury.
At the end of its design life, the inverter should be disposed as
industrial waste. During incineration, the electrolytic capacitor
may explode and some parts may produce toxic and harmful
gases.
DANGER
DANGER
DANGER
3. INSTALLATION AND WIRING
3.1 Pump Installation
ŸThree models are available and the pump selected must be matched to the
borehole output to provide optimal operating performance. This should be done
with reference to the borehole drillers report in consultation with a borehole
installation specialist. As a rule pump output should not exceed 65% of
maximum tested borehole yield.
ŸPumps can be installed either vertically or horizontally, though if installed
0
horizontally the discharge outlet should never fall below 10 the horizontal plane.
Fig. 2 Pump Axis Limits
Allowed
Not
Allowed
0
Min 10
Fig. 1 Pump Installation Arrangement
Rope
Pressure Gauge
Cable
Outlet
Check
Valve
Ball
Valve

45
ŸWhen positioning the pump it is important to ensure adequate motor cooling
through water flow past the motor. This will be achieved by installing the pump
suction above the borehole main aquifer or well screen and if not possible or in
cases of open water installation a cooling sleeve must be used. Recommended
3
minimum flow rate past the motor is 0.2m /sec.
ŸIt is recommended that the complete pump is submerged at least 3m below the
dynamic water level and if possible the pump should be installed at least 3m from
the bottom of the borehole to prevent silting damage. As a rule the pump should
be positioned mid-way between the bottom of the borehole and the dynamic
water level assuming that the main aquifer is below this level. If in doubt consult
the pump supplier.
For shallow boreholes (less than 50m) a manual tripod arrangement can be used.
When moving the pump the following procedures should be followed:-
ŸBefore starting pump lowering it is important to check the borehole depth and
straightness to ensure it is as expected and there is unobstructed passage. The
pump should be carefully lowered into the borehole and if an obstruction is
encountered the pump should be removed and the cause investigated to avoid
pump or cable damage.
• Fit the first starter pipe into the pump outlet and ensure a tight leak free joint
while the pump is on the surface. The thread on the starter pipe should not be
longer than the threads in the pump outlet or it will interfere with operation of the
non-return valve.
• Screw the starter pipe into a robust adaptor hook attached to the winch or tripod
cable and lower the pump and pipe section into the borehole. When fully
lowered hold the pipe below the socket with a clamp, disconnect the lifting hook
and attach to the next pipe length ensuring a water tight connection. Ensure the
pipe joint is fully home and repeat until all pipes are lowered.
• While the pipes are being, lowered bind the drop cable, low level cable and
airline to the drop pipes with a PVC cable clip at 2m/centres.
3.2 Pump Lowering
3.3 Pump Operation
When the pump has been connected correctly and is submerged in water proceed as
follows:-
ŸFirst check the direction of rotation by starting the pump and observing a normal
water flow. If low or uneven, change the direction of rotation by switching two
phase connections.
ŸThe pump should then be run with the discharge valve restricted to approximately
1/3 of its maximum volume of water. Observe if there are impurities in the water
and then gradually open the valve until the water is observed to be clear. If the
water continues to be silted the pump is installed too low in the borehole and it
should be raised until it is in a position of clear water availability. Alternatively a
borehole problem is indicated and a driller should be consulted.

46
ŸAs the valve is being opened, the water output should be monitored to ensure that
the pump output does not exceed the borehole capacity as indicated by the pump
starting and stopping on the low level relay (if fitted) or uneven water flow at the
outlet. If this occurs the pump should either be changed to one of suitable
specification or throttled on the outlet valve to a sustainable output. Note that the
dynamic water level should always be above the suction interconnector of the
pump.
ŸAfter the water flow settles, the pump overload relay should be set. This is carried
out by reducing the overload setting to the cutout condition and then increasing
by +10%.
ŸDuring regular operation the pump operating current should be periodically
monitored and if a substantial change is noted (±10%) it should be investigated
by a service technician. Pump output should also be monitored and if the flow rate
or consistency changes, investigations should be made.
Ÿ In order to obtain maximum pump life, the number of starts should not exceed
30 per hour. It is also necessary to start the pump at least once monthly to prevent
seizure.
3.4 Enclosure Sockets
Fig. 3 Wiring Diagram
1
2
3
4
5
6
7
8
9
1
3
2
4
Socket
DC Input
Motor Output
Water Level Switch Input
Terminal Description
P
N
M
S

47
Socket
Left Side
Connection
Connected to positive side of
solar array
3.5 External Socket Description
One-strand, black
P
Wire Description Connection Description
One-strand, black
Four - core
wire
Yellow
green wire
White
three - core
wire
Red wire
Yellow wire
Blue wire
S1
S6
S7
Connected to negative side of
solar array
Connected to protective ground
wire (yellow green) (1)
Connected to U phase of the
motor (black) (2)
Connected to V phase of the
motor (brown) (3)
Connected to W phase of the
motor (blue) (4)
Connect to ground signal wire
Connect to well signal line 1
Connect to tank signal line 2
N
M
S
+
-
S5 Connect to well signal line 2
S8 Connect to well signal line 1
WARNING
Ensure that the wires are connected according to the above
instruction, incorrect connection may lead to faulty operation
of system.
3.6 Water Level Switch
Solar pumping inverter can work with water level switches for well and tank. Water
level switch for well is used to protect against low water level in the well, water level
switch for tank is used to turn off the pump when the tank is full.
Water level switch has Normally-Open and Normally-Closed contact type. The
difference is shown in the picture below. Low level control should be set to Normally
Open, High level to Normally Closed.
Fig. 3
Normally
Opened
Normally
Closed
Water Level
Over H_high Closed Opened
Water Level
Under H_low Opened Closed

8
Switch Fault
The water level switch may not work properly if the cable is wrongly connected or the
signal wire is disconnected due to wear and tear.
WARNING
To ensure stable operation of system, select cable size
according to recommendation as below.
Model
SunFlo-X 600H 2.5
Solar Array Cable
(P,N)
2
(mm )
Earth Wire
(PE)
2
(mm )
Pump Cable
(U, V, W)
2
(mm )
Water Level
Switch Wire
(S)
2
(mm )
SunFlo-X 1200H
SunFlo-X 1800C
2.5
4.0
2.5
2.5
2.5
2.5
2.5
4.0
2.5
2.5
4.0
≤
≤
≤
3.7 Earthing Instructions
The inverter must always be earthed with an earthing conductor connected to
earthing terminal. This ensures the safety of operation and lightning surge
protection.
Ambient temperature condition for the above-recommended
wire size is ≤60°C.
NOTE
Fig. 4 Product appearance and installation dimension
2-d
W1
H1
H
W
D
D1
Model W
Appearance and installation dimensions (mm)
SunFlo-X 600H 146
Weight
kg
SunFlo-X 1200H
SunFlo-X 1800C
146
146
202
202
202
3.6
4.3
4.3
H D W1 H1 D1 d
244
284
284
187
187
187
232
272
272
113
113
113
6
6
6

9
WARNING
To ensure good cooling effect, use vertical installation for the
inverter. If vertical installation cannot be applied, ensure the
tilt angle is no more than 10°.
3.8 Panel Layout and Instruction
Dayliff solar pumping inverter uses LED display operation panel as shown in the figure
below, it includes 5 LED lights and 5-digit 8-SEG nixie tubes and 8 keys in 2 rows.
Mode Indicator Light:
RUN, STOP, FAULT, NORMAL, ABNORM
5 Segment Display Elements
Operation Keys
RUN STOP FAULT NORMAL ABNORM
RUN
STOP
DATA
MODE
PROG
ENTER
Fig. 6
Indicator Lights &
Keys
RUN
Name Function Description
STOP
FAULT
NORMAL
ABNORMAL
Running Indicator Light
Shutdown Indicator Light
Fault Indicator Light
Normal Indicator Light
Abnormal Indicator Light
Run Key
Stop Key
Data Inquiry Key
Green
Red
Red
Green
Red
Bright: Inverter is running
Bright: Inverter is shut down
Bright: System fault
Bright: System normal
Bright: Water tank or well water level is
abnormal
Not being used
Control the start of the inverter
Control the stop of the inverter
Mode Switch Key 1. Switch for data viewing
2. Switch for data editing
RUN
STOP
DATA
MODE
Increasing Key
1. Increase parameter number or its value in control
parameter display status
2. Increase output frequency or display current
running data according to operation mode

Indicator Lights &
Keys
Name Function Description
Decreasing Key
1. Decrease parameter number or its value in control
parameter display status
2. Decrease output frequency or display current
running data according to operation mode
Programming Key Enter or quit from the display status of the control
parameter
PROG
Enter Key
1. Confirm the content to be viewed or modified
2. Confirm and save the parameter value when the
parameter is modified
ENTER
+Reset Key Press the combination key to restore normal
operation in protection status
10
4. OPERATION
4.1 Initial Settings before First Operation
Below operations must be performed by a qualified electrician to ensure safety. To ensure
the pump is not running in reverse, refer to below instructions:
Helical Rotor Pump
Lower the water inlet in the water, switch on and observe the water
outlet.
If no water comes out, exchange any pair of pump cable connections with
the inverter.
If there is water yield, that is the correct wiring.
Centrifugal Pump
1. Power on when the sunshine is sufficient.
2. Observe the water yield when pump is steadily working.
3. Exchange any pair of pump cable connections with the inverter.
4. Observe the water yield when pump is steadily working.
Choose the wiring with more water yield.
When using water level switch, user needs to set the related control parameter of the
selected water level switch type.

11
Step
Press “STOP” to stop the operation when power on. Modify Pr.0 value to 0.
Refer to page 8 for recommended sensor type
1
Debugging Content Instruction
Modify the control
parameter as read-write
parameter
1. Modify Pr.31value to 1 if using Normally-Close type water level switch
for well.
2. Modify Pr.31 value to 2 if using Normally-Open type water level switch
for well.
2Modify the setting of
well water level switch
1. Modify Pr.32 value to 1 if using Normally-Close type water level switch
for tank.
2. Modify Pr.32 value to 2 if using Normally-Open type water level switch
for tank.
3Modify the setting of
tank water level switch
Modify the Pr.0 value to 1 before resetting the inverter
4Modify the control
parameter as read only
WARNING
The control parameter of the inverter must be changed with
caution or the system will malfunction.
Refer to page 8 for recommended sensor type
4.2 Display Status
There are 2 statuses on the operation display panel: current operating parameters display
and control parameter display. The default status is operating parameter display.
Press the key to enter the status of control parameter display, and press the key again
to return to the running data display status.
PROG
PROG
Running Data
Display
Control Parameter
Display

Example: Ud. 120
Indicate: 120V
12
4.3 View Current Operational Parameters
Operation Description Display
Display current running data
Input voltage of the inverter
Initial Status: Current running
data
Display current running data
Input current of the inverter
Display current running data
Output power of the inverter
Display current running data
Output voltage of the inverter
Display current running data
Output current of the inverter
Display current running data
Inverter temperature
Display current running data
Motor rotating speed
Display current running
data.
Output frequency of the inverter
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
Example: F. 5000
Indicate: 50.00Hz
Example: 1. 50
Indicate: 5.0A
Example: P. 570
Indicate: 570W
Example: U0.50
Indicate: 50V
Example: 1 0. 1 1.5
Represent: 11.5A
Example: r. 35
0
Represent: 35 C
Example: r. 2700
Represent: 2700rad/min
Display current running data
Output frequency of the inverter
Example: F.5000
Represent: 50.00Hz
MODE

13
4.4 View or Modify the Control Parameters
Operation Description Display
Initial Status: non-control
parameter display
Enter the parameter modification
interface
Display parameter 0
PROG
Pr. 0
Indicate Pr.0
Select the parameter to be viewed
and modified
Display parameter number
Example: pr.031
Indicate: Pr.31
Confirm to view and modify the
parameter
Display parameter value
Example: 0
Indicate: 0
Change parameter value Example: 1
Indicate: 1
Confirm and save the parameter
value
Display next parameter number
Example: pr.032
Indicate: Pr.32
ENTER
or
PROG
Quit from the parameter display
mode
Display current running data
Example: F.0.00
Indicate: Pr.32
When inverter is operating, the control parameters can only be
read. To modify, the inverter must be stopped first.
4.5 Change Frequency during Operation
Operation Description Display
Switch the digit to modify
(unit, decade, hundred)
Initial Status Display current running data
Output frequency of the inverter
Example: F.30.00
Indicate 30.00Hz
Enter the parameter modification
interface
Display the current target frequency
Example: 30.00
Indicate: 30.00Hz
Example: 30.00
Indicate: the blinking digit can be
modified
Modify the target frequency Example: 50.00
Indicate: Change to 50Hz
ENTER
or
Confirm the change and save the
target frequency
Display current operation frequency
of the inverter
Example: F.50.00
Indicate: 50Hz
ENTER
MODE
ENTER
or
NOTE

14
4.6 Function Parameter Description
Pr.0 Mode of parameter
setting
0: Parameter can be read and edited. Other
parameter values cannot be modified until
Pr.0 is modified to 0.
1: All parameters can only be read.
2. Restores all parameters to factory values
Number Name Description
Factory
Set
Value
Scope
0-2
1
Pr.1-Pr.30 Records of fault type
and fault information Read only
Each fault information is stored in 3 parameters
as fault type, motor input voltage when fault
happened, pump operating frequency when
fault happened. The inverter can store the last
1 0 g r o u p s o f f a u l t i n f o r m a t i o n .
For example,Pr.1~Pr.3 are the information of
the first fault. Pr.1 records the fault type, Pr.2
records the motor input voltage,Pr.3 records the
pump operation frequency. Pr.4~Pr.6 are the
information of the next fault, and so on.
Please refer chapter 4 to see the fault code
description.
no
Pr.31 Well switch setting 0-2
0：By-pass water level switch.
1：Normally-Close well water level switch.
2：Normally-Open well water level switch.
0
Pr.32 Tank switch setting 0-2
0：By-pass water level switch.
1：Normally-Close tank water level switch.
2：Normally-Open tank water level switch.
Pr.33 Control model
setting 0-1
Pr.34 Start delay time 1-6000
0: Press RUN key to run while the target
frequency can be changed manually.
1: Full-automatic operation
1
Pr.35 0-2
Start delay time when power is on or shutdown
Pr.36
0:invalid
1:valid for helical rotor pump
2:valid for centrifugal pump
Read
Only
0
0
Loss of load
protection is valid
or not
Total generated
energy
0
30s
Unit: kWh
After modifying the parameters in the table above, the next
operation cannot be performed until the inverter has been
reset.
NOTE
NOTE
The modification can be only applied when Pr.33 value is 0.

15
5.1 Fault Codes Description and Counter Measure
DC solar pumping inverters have complete protection functions. When system fault
occurs, the inverter will take protection counter measures: The general protection
measure is to stop the inverter immediately and not allow the inverter to restart in a while.
When fault or protection occurs, the inverter operation panel will automatically display the
blinking fault code in the last 2 digit nixie tubes. If the first 1 digit nixie tube displays “P”, it
means the fault or protection requires the inverter to reset to restore normal operation.
User can shut off the power supply and then power on the inverter until the internal power
supply is off, or press the “RESET” key combination to reset. If the fault persists after
resetting, contact the nearest D&S dealer.
When the fault or protection has been cleared after resetting, the inverter will
automatically proceed with the restart countdown. During this time, the fault code will
appear in the first 2 nixie tubes, and the last 3 digit nixie tubes will display the restart
countdown time, when the countdown time is reached, fault code display will disappear
automatically and the inverter will display operation status.
Code Code Description Possible Reason Counter Measures
Over - Voltage High Input Voltage Inspect solar array voltage
Inspect solar array voltage
Under - Voltage Low Input voltage
Weak sunlight intensity
Change low - power pump load
Inspect solar array voltage
Increase cable size
Over - Current
Large pump load
Low solar array voltage
Motor stopped operating
Reduce the highest operation
frequency
Overload Large Load
Inspect the wiring
Over-current of the
module
Output short circuit or
grounding
Module damaged
Clear the air duct or improve the
ventilation
Over-temperature
of the module
Air duct blocked
High temperature
o.U
L.U
o.c
o.l
o.p
1.r
5. TROUBLE SHOOTING
Contact D&S dealer
AC CT fault Device or circuit damaged
Contact D&S dealer
DC CT fault Device or circuit damaged Contact D&S dealer
Step out fault Device or circuit damaged
c.i
c.d
d.F
Inspect the output wires of motor
Phase loss fault Output circuit broken
c.e
Inspect the pump
Locked rotor fault Pump stuck
r.e
Reset contact dealer
Communication
fault Device or circuit damaged
P.ee

16
5.2 Other Codes Description
Code Code Description Relevant Description
Parameter initialisation Return to normal after resetting
Return to normal after resetting
Important parameter
modification
l :48V rated voltage
H:110V rated voltage
600:1800:rated power
Inverter model
Countdown of the restart: 30 seconds
Start delay time
When well water level becomes normal, system will restart
after 600 seconds
Well water level is too low
When tank water level becomes normal, system will restart
after 600 seconds
Tank water level is too high
p 1.u.
p e.c
l-600
on 30
ab.5l
ab.rf
h-1800
5.3 Fault Inquiry and Reset
The inverter record the fault codes of the last 10 events. Fault information is stored
together with the control parameter Pr.1-Pr.30. Please refer to panel operation method to
search and find out the fault information.
When the inverter fault occurs, please press and reset keys combination together,
or cut off the power supply and restore normal operation.
WARNING
Before resetting, complete the check up on the cause of the
fault. Otherwise the inverter may get damaged.
WARNING
The reset should be delayed for 5 minutes when the inverter is
overloaded or overheated.

617
The motor overload has tripped out
The pump does
not run
Reset the motor starter overload. If it
trips again, check the voltage and if
normal call service technician
Flow not sufficient
Operation voltage insufficient Select an appropriate pump
Resize and increase the solar array
Solar array has not met design
requirement
PROBLEM POSSIBLE CAUSE SOLUTION
Check DC input wires connection Indicator light is off
Indicator light is on
Inverter does
not work when
powered on Cut of inverter input wires and check
if input voltage is abnormal
The inverter is defective Check the inverter
The dry running protection has cut out
the pump due to low water level
Check the water level. If it is in order
check the water level electrodes/
level switch
The pumps submersible drop cable is
defective Repair/replace the pump cable
The draw down is larger than anticipated
Increase the installation depth of the
pump, throttle the pump or replace it
by a smaller model to obtain a
smaller capacity
Wrong direction of rotation Change direction of rotation
The valves in the discharge pipes are
partly closed or blocked
Check and clean or replace the
valves and discharge pipe
The non-return valve of the pump is
partly blocked
Pull out the pump. Check and clean
or replace the pump if necessary
The pump is defective Repair or replace the pump
Leakage in the pipework Check and repair the pipe work
Wires loosely connected
High operation
frequency but no
water yield
Tighten wires and check if firmly
connected
Select an appropriate pump
Pump is running in reverse Check connections
Installation head is more than pump
maximum lift head
Dirt in the pump Clean pump