Lorentz PSk2-7 User manual

Page 1 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
Troubleshooting Guide
for PSk2-7 to PSk2-40 pump
systems

Page 2 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
NOTE
The trouble shooting of the PSk2-7 –PSk2-40 Controller should be done directly on the field
when all cables are still connected (PV Generator, PV Disconnect, sensors, motor cables, etc.).
The easiest way to do a trouble shooting of the new PSk2 Controller is with PumpScanner.
Therefore, it is always recommended to connect to PumpScanner first even if the LEDs of the
Controller housing are not flashing.
This trouble shooting guide serves as quick support when you are on site and do the
installation of a PSk2 system. It provides an explanation of the electrical installation including
the handling of electrical instruments.
With the help of this document a diagnosis for the PSk2 Controllers can be done more easily
and quickly. PartnerNET and the LORENTZ Support Team are available in case of further
questions.
This document also refers to other explanatory documents on partnerNET which are necessary
for the further diagnosis of the issue and the replacement of specific boards.
WARNING –All electrical inspections must be performed
by qualified experts only.
WARNING –Do not dismantle the Controller when it is
connected to the power supply! Before doing any
maintenance or inspection work disconnect the Controller
from the power supply and wait at least 5-10 minutes!

Page 3 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
1. No access to the Controller device with PumpScanner ............................................................................7
1.1 The pump is working (water coming out of the pump) .......................................................... 7
1.1.1 Bluetooth connection...................................................................................................... 7
1.1.1.1 Mobile device .............................................................................................................. 7
1.1.1.2 Datamodule already connected with another mobile device..................................... 7
1.1.2 Restricted permissions .................................................................................................... 7
1.1.3 Malfunction of the Controller main board...................................................................... 8
1.2 The pump is not working (no LED signals)............................................................................... 9
1.2.1 Check the open circuit voltage of the solar generator.................................................... 9
1.2.2 Check the voltage at the power input and power output of the PV Disconnect............ 9
1.2.3 Check the voltage at the power input and power output of the SmartPSUk2 ............... 9
1.2.4 Check the voltage at the power input of the PSk2 Controller......................................... 9
1.2.5 Check if the PSk2 Controller has a short circuit .............................................................. 9
1.2.5.1 Indication of short circuit in the PSk2 Controller ........................................................ 9
1.2.5.2 Actions before checking the boards of the PSk2 Controller ....................................... 9
1.2.5.3 Inspection of the PSk2 Controller boards for short circuit........................................ 10
1.2.5.4 Inspection of the Controller main board for short circuit......................................... 10
1.2.5.5 Inspection of the fan for short circuit........................................................................ 11
1.2.5.6 Inspection of the internal 24 V Power Supply Board ................................................ 12
1.2.5.7 Inspection of the IO Board ........................................................................................ 13
2. Access to the Controller device with PumpScanner ............................................................................... 14
2.1 The pump doesn’t work properly (water coming out of the pump)..................................... 14
2.1.1 No LED signals on the front side of the Controller when the pump is running ............ 14
2.2 Pump status indicator light is solid red (pump stops running) ............................................. 14
2.2.1 Pump off reasons (PumpScanner)................................................................................. 15
2.2.1.1 Source low (wrong signal/wrong operation of the sensor) ...................................... 15
2.2.1.2 Remote Switch (wrong signal/wrong operation of the sensor)................................ 15
2.2.1.3 Water Sensor............................................................................................................. 16
2.2.1.4 Manual software switch off....................................................................................... 16
2.2.1.5 Wrong input voltage.................................................................................................. 16
2.2.1.6 Timer.......................................................................................................................... 16
2.2.1.7 Sun Sensor................................................................................................................. 17
2.2.1.8 PSU Sun Sensor.......................................................................................................... 17
2.2.1.9 Daily amount ............................................................................................................. 17
2.2.1.10 Min. speed timer ................................................................................................... 17

Page 4 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
2.2.1.11 Pressure / liquid level sensor................................................................................. 18
2.2.1.12 Constant pressure / flow control........................................................................... 18
2.2.1.13 PSU switching power source ................................................................................. 18
2.2.2 Advanced information (PumpScanner)......................................................................... 18
2.2.2.1 Analog Input 1 Error & Analog Input 2 Error............................................................. 18
2.2.2.2 Overtemperature ...................................................................................................... 19
2.2.2.3 igbt overtemperature................................................................................................ 19
2.2.2.4 mmpt overtemperature ............................................................................................ 19
2.2.2.5 PSU overtemperature................................................................................................ 19
2.2.2.6 PSU not ready............................................................................................................ 19
2.2.2.7 PSU Phase Missing..................................................................................................... 20
2.2.2.8 PSU input frequency low........................................................................................... 20
2.2.2.9 No communication with the PSU .............................................................................. 20
2.2.2.10 Internal comm error (mmpt)................................................................................. 20
2.2.2.11 Internal comm error (Bt) ....................................................................................... 20
2.2.2.12 PSU ext Temp Sensor............................................................................................. 20
2.2.2.13 igbt overcurrent..................................................................................................... 20
2.2.2.14 mmpt overcurrent................................................................................................. 21
2.2.2.15 Internal comm error (LED)..................................................................................... 21
2.2.2.16 mmpt temp sensor error....................................................................................... 21
2.2.2.17 PSU error detected................................................................................................ 21
2.3 Malfunction of the interface board / filter board ................................................................. 22
2.3.1 Malfunction of the interface board............................................................................... 22
2.3.2 Malfunction of the filter board...................................................................................... 22
3. Spare parts for PSk2-7 to PSk2-40.......................................................................................................... 22

Page 5 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
Quick Guide
A
The pump doesn’t work properly
Go to Actual Data/Pump off reason
Access to PumpScanner
Pump off reasons: --> Page 14
➔Tank full
➔Source low
➔Manual software switch off
➔Timer
➔Sun Sensor
➔PSU Sun Sensor
➔Daily amount
➔Min. speed timer
➔Pressure switch/Liquid level
➔
Advanced pressure/flow control
➔PSU operation error

Page 6 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
B
No access to the pump with PumpScanner
Pump doesn’t work (no LED signals)
Check the Controller main board →Page 10
Check the Fan →Page 11
Check the power supply of the Controller main board
2
Check the internal 24 V power supply →Page 12
Quick check of the voltage at the power input of the Controller
Check the voltage: →page 9
-at the PV Generator side
- at the power in - & output of the PV Disconnect
- at the power in - & output of the PV Protect
- at the power in - & output of the SmartPSUk2
- at the power in - & output of the Controller
1
(f) - Power supply 24 V
(a) - LED board
(d) - Main board
(e) - Interface board
(c) - Current board
(b) - Filter board
(h) - Fan
a
b
c
d
e
f
h

Page 7 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
1. No access to the Controller device with PumpScanner
1.1 The pump is working (water coming out of the pump)
1.1.1 Bluetooth connection
1.1.1.1 Mobile device
In most cases the Bluetooth connection issue is related to the mobile device.
Cause:
Lost connection
Device/pump recognition issue
Solution:
Stop all background applications and turn Bluetooth off and on again
Remove the pump (name/serial number) from the pump list by holding the finger for a few
seconds on the pump name/serial number
Close the PumpScanner application or restart the mobile device
Relaunch PumpScanner and rescan the pump
1.1.1.2 Datamodule already connected with another mobile device
Cause:
Datamodule can only enable one Bluetooth connection at a time
Solution:
Check if one of the Controller LEDs is showing a solid blue light
oIn this case another mobile device is already connected with the Bluetooth device
of the Datamodule
Disconnect the first mobile device and try again with the second one
1.1.2 Restricted permissions
Could be the case where accessing the controller is not possible even when the device is present.
Cause:
Request for credentials is activated
Controller not registered in the partner’s account
Solution:
Introduce the default credentials or the new established credentials
Make sure to register the Controller serial number to a Site in partnerNET

Page 8 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
1.1.3 Malfunction of the Controller main board
Cause:
Defective component on the Controller main board
Solution:
The Controller main board has to be replaced
PSk2-7 –PSk2-40 Controller main board
Position
Name
1
Plug for the filter board
2
Plug for the Fan
3
Plug for the current board
4
Plug for the ON/OFF
Switch
5
Plug for the LED board
6
Plug for the IO board
7
Plug for the heat sink
8
Plugs for sensors, Sun
Sensor
9
Plug for the 24 V (service)
10
Plug for the interface
board
11
Plug for the 24 V
12
Plug for the SmartPSUk2
13
Plug for the SmartStart
14
Plug for the filter board
CAUTION –Follow the repair guide of the PSk2 Main
Board for correct replacement.
Figure 1: main board
1
5
6
10
12
3
2
7
8
9
13
4
11
14

Page 9 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
1.2 The pump is not working (no LED signals)
1.2.1 Check the open circuit voltage of the solar generator
▪Inspect (with a multimeter) the open circuit voltage of the solar generator
▪Make sure there is no broken cable or loose connection
oMake sure the system is voltage-free before pulling the cables (Danger of a
life-threatening arc)
▪No voltage drops and the expected open circuit voltage is available
1.2.2 Check the voltage at the power input and power output of the PV Disconnect
▪Make sure there is no broken cable or loose connection
oMake sure the system is voltage-free before pulling the cables (Danger of a
life-threatening arc)
▪Make sure there is no voltage drop between the solar generator and the PV Disconnect
1.2.3 Check the voltage at the power input and power output of the SmartPSUk2
▪Make sure the PV Disconnects are switched off
▪Make sure there is no broken cable or loose connection
▪Make sure there is no voltage drop between the PV Disconnect and the SmartPSUk2
▪Make sure the SmartPSUk2 is working properly
1.2.4 Check the voltage at the power input of the PSk2 Controller
▪Make sure the PV Disconnects are switched off
▪Check the cable connections (no loose connection) and polarity
▪Make sure the expected VOC is available (solar direct)
1.2.5 Check if the PSk2 Controller has a short circuit
1.2.5.1 Indication of short circuit in the PSk2 Controller
▪VOC available on the PV Generator side
▪Voltage break down at the power input of the Controller (the multimeter shows a
voltage value around zero)
1.2.5.2 Actions before checking the boards of the PSk2 Controller
▪Switch OFF the PV Disconnects
▪Wait at least 5 minutes or use a multimeter and keep a watch on the voltage at the
power input of the Controller until it drops below 20 V before disconnecting cables
▪Work in a dry environment protected against rain/humidity

Page 10 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
1.2.5.3 Inspection of the PSk2 Controller boards for short circuit
▪Use an external power supply and set the current limit at 500 mA and the voltage at
24 V
▪Connect the external power supply output to the Controller terminals 17 and 18 (use
of batteries is not recommended due to the missing current limitation which can
cause several damages)
1.2.5.4 Inspection of the Controller main board for short circuit
▪Unplug the internal 24 V power supply board
▪Switch the power output of the external power supply on
▪Check the PSk2 Controller main board for any LED signal
oIn case there are LED signals visible on the Controller main board, the internal
power supply 24 V is defective
oIn case there is a voltage break down, the PSk2 Controller main board has a
short circuit
Figure 4: Unplug the internal 24 V power supply
Figure 5: Unplug the Fan
Figure 2: Setting the external power
supply unit
Figure 3: Connect the external power supply to terminals 17 & 18 of the PSk2
Controller

Page 11 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
Two LED signals should be visible on the PSk2 Controller main board in case there is no short circuit.
The red LED on the bottom right (Figure 6) shows when the PSk2 Controller main board is supplied
with power. The upper green flashing LED shows the Bluetooth operation.
Cause
Defective internal 24 V power supply
Defective or shorted fan
oBurned traces at the plug area of the fan (on the Controller main board)
oBurned traces on the fan plug
Defective component on the Controller main board
Solution
Switch the PV Disconnects off and disconnect the PSk2 Controller
Replace the Controller main board and the fan if there are burnt traces at the fan plug area
Reconnect the Controller, switch on the PV Disconnects and the Controller
1.2.5.5 Inspection of the fan for short circuit
The fan can also be tested separately with the external power supply (settings 24 V/12 V; 500 mA). In
case the voltage breaks down, the fan has a short circuit.
Cause
Moisture
Blocked fan
oInsects
oforeign bodies
Defective fan
Bluetooth LED (green flashing LED)
Powered Controller main board (red LED)
Figure 6: LED signals on the PSk2 Controller main board

Page 12 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
Solution
Switch the PV Disconnect off and disconnect the PSk2 Controller
Replace the fan following the guide for replacing the DC brushless fan in a PSk2 series pump
controller
Reconnect the Controller to the PV Disconnect and switch the power on
1.2.5.6 Inspection of the internal 24 V Power Supply Board
A quick test of the internal PSk2 Controller power supply (when the PSk2 Controller is still connected
to the solar generator) can be done by measuring the voltage at the terminal clamps 15 (+) or 9 (+) or
11 (+) and 16 (-). Any voltage well under 24 V or around 0 V would be an indication of the
malfunction of the internal 24 V power supply of the PSk2 Controller.
Before checking the internal 24 V power supply, make sure the internal 24 V power supply cable is
unplugged from the Controller Main Board (Figure 4). An external 24 V power supply should be
connected to the Controller terminals 17 & 18. In case LEDs on the Controller Main Board go on after
switching on the external power supply, the internal 24 V power supply has a short circuit.
Cause
Short circuit of the analog input
Overvoltage at the power input of the PSk2 Controller
Defective fan/ defective connection cable of the fan
oBurned traces at the plug area of the fan cable on Controller main Board
oBurned traces on the fan plug
Solution
Switch the PV Disconnects off and disconnect the PSk2 Controller
Check the fan for short circuit
Replace the internal 24 V power supply
Reconnect the power input to the Controller, switch the PV Disconnects on and switch the
Controller on
CAUTION –Follow the guide for replacing
the DC brushless fan in a PSk2 series pump
controller.
Figure 7: PSk2 cooling fan

Page 13 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
In case the Controller still does not show any LED signals the Controller Main Board might be
defective/ shorted
1.2.5.7 Inspection of the IO Board
In some cases, a short circuit of the IO Board can lead to a complete shutdown of the Controller. The
Controller Main Board and the Internal 24 V power supply should be checked first and the IO Board
thereafter.
1. Remove the IO Board from its socket first
2. Connect the external power supply to the Controller (terminals 17 & 18)
3. Unplug the internal 24 V power supply and switch the external power supply on
4. In case LEDS on the main board go on, the IO Board could be faulty.
Cause
Short circuit of the analog input or water sensor input
Defective pressure or liquid level sensor
Damage due to voltage spike through a sensor cable
Wrong insertion of the IO Board
Solution
Replace the IO Board
Check each single sensor before connecting to the Controller
Check the recommended surge protector of each input (if used)
CAUTION –Follow the repair guide
of the PSk2 DC-DC Power supply for
correct replacement.
Figure 8: PSk2-xx, Power supply 24 V
CAUTION –Follow the repair guide of
the PSk2 IO board for correct
replacement.
Figure 9: IO board

Page 14 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
2. Access to the Controller device with PumpScanner
2.1 The pump doesn’t work properly (water coming out of the pump)
2.1.1 No LED signals on the front side of the Controller when the pump is running
The system is connected to the PumpScanner App and pumping water out of the well even though
there are no LED signals on the front side of the Controller.
Causes
Defective LED board
Unplugged or broken cable of the LED board
Solution
Switch the PV Disconnects off and disconnect the Controller
Plug the LED board cable correctly
Or replace the LED board
2.2 Pump status indicator light is solid red (pump stops running)
The red solid LED “Pump stopped” appears when there is an error or a failure causing the Controller
to stop the system. Each error will be displayed in PumpScanner under “actual data”. Therefore,
check in first place the pump off reason in PumpScanner.
The following events are mostly related to a given settings in PumpScanner or just showing the status
of the system.
Pump off reasons:
Figure 10:LED board
CAUTION –Follow the repair guide of the PSk2 LED
board for correct replacement.

Page 15 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
•Tank full –Remote Switch
•Source low
•Water sensor
•Manual software switch off
•Wrong input voltage
•Timer
•Sun Sensor
•PSU Sun Sensor
•Daily amount
•Min. speed timer
•Pressure / liquid level sensor
•Constant pressure/flow control
•PSU operation error
2.2.1 Pump off reasons (PumpScanner)
2.2.1.1 Source low (wrong signal/wrong operation of the sensor)
A wrong signal of a source low sensor can only be addressed if the water level in the well is obviously
above the Well Probe. A wrong “Source low” signal can have different root causes.
Causes:
Loose connection
Broken cable
Bad cable splice
Defective Well Probe
Defective I/O Board
Solution
Measure the voltage at the terminal clamps 1 & 2 (the voltage should be around 5 V)
Set a jumper at the terminals 1 & 2 (in case the failure persists the I/O board is defective)
Test the Well Probe (continuity test using a digital multimeter)
Replace the Well Probe
Replace the I/O Board (if the malfunction is not due to the Well Probe)
2.2.1.2 Remote Switch (wrong signal/wrong operation of the sensor)
A wrong signal of the Remote Switch can only be addressed if the signal does not truly reflect the real
situation on site. A wrong signal of the Remote Switch can have many root causes.
Causes:
Loose connection
Broken cable

Page 16 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
Defective Remote Switch
Defective I/O Board
Solutions:
Measure the voltage at the terminal clamps 3 & 4 (the voltage should be around 5 V)
Set a jumper at the terminals 3 & 4 (if the pump still does not run then the I/O is defective)
Replace the defective Remote Switch
Replace the I/O Board (in case the malfunction is not due to the Remote Switch)
2.2.1.3 Water Sensor
A Water Sensor error can be directly related to the sensor itself, the cable or to a low water situation
in the pipe.
Causes:
Low water level in the well
Air present in the suction pipe
Broken cable (open loop)
Solution:
Check the water level in the well
Check the pipe for leakage
Check the functionality of the Water Sensor
2.2.1.4 Manual software switch off
The pump system has been stopped due to a software setting. The setting has to be changed in
PumpScanner (Operational Settings -> Pump Speed -> Pump OFF) in order to run the pump system
again.
2.2.1.5 Wrong input voltage
This alarm will occur when a high or a low DC voltage level is detected at the power input of the
Controller.
The voltage should be under the maximal allowed level (850 V) and at least 450 V at the power input
of the PSk2 Controller.
2.2.1.6 Timer
The pump system has been stopped due to a software setting. The timer setting has to be configured
/ changed in PumpScanner (Operational Settings) in term to run the system again.

Page 17 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
2.2.1.7 Sun Sensor
A Sun Sensor error can be due to the following root causes.
Causes:
Low irradiation
Loose connection
Broken cable
Defective Sun Sensor
Wrong serial number of the Sun Sensor
Defective I/O board
Solution:
Check the irradiation level (cloudy or sunny conditions)
Check the setting in PumpScanner
Check the cable connections and polarity
Check if the serial number of the Sun Sensor Module has been entered correctly
Check the Sun Sensor terminal clamps (the voltage at the terminal clamps 7 and 8 should be
below 2 V)
Test the Sun Sensor separately with a multimeter (Voc= 10.2 V)
Replace the defective Sun Sensor
Replace the I/O Board (if the malfunction is not due to the Sun Sensor)
2.2.1.8 PSU Sun Sensor
The PSU Sun Sensor alarm occurs when the measured irradiation by the Sun Sensor is lower than the
minimum irradiation configured in PumpScanner in terms to run the pump in PSU blending mode.
The irradiation parameters can be changed in PumpScanner (Feature Settings -> SmartPSU).
2.2.1.9 Daily amount
The pump has been stopped due to a software setting. The daily amount of water set has been
reached causing the Controller to stop the pump.
The pump will automatically restart the next day. A setting change can be done in PumpScanner
under “Feature Settings” -> “Control Pump by Water Meter” -> “Daily amount”.
2.2.1.10 Min. speed timer
The Min. speed timer error occurs when the minimum required motor speed set to protect the
motor could not be reached.

Page 18 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
Causes:
Low irradiation
Low power
Solution:
Check the irradiation level (cloudy or sunny conditions)
Check the wiring of the PV generator
Check the voltage and the current at the power input of the PSk2 Controller
2.2.1.11 Pressure / liquid level sensor
The pump has been stopped due to a software setting (Feature Settings). The pressure or the water
level exceeded the set max. or min. limit. Generally, the pump will automatically restart when the
measured pressure or liquid level value in the sensor drops below or jumps above the fixed value or
the set timer in PumpScanner has expired.
In case the pump off reason is not related to the settings in PumpScanner, the I/O Board and the
functionality of the Liquid Level/ Liquid Pressure sensor should be tested.
2.2.1.12 Constant pressure / flow control
The pump been stopped due to a software setting (Feature Settings). The pressure or the flow rate
exceeded the min. or max. set limit in PumpScanner causing the Controller to stop the pump. The
Controller will automatically restart and try to resume constant pressure or flow rate.
2.2.1.13 PSU switching power source
The pump has been stopped temporarily by the Controller to perform a smooth transition between
solar-only and hybrid power operation or vice versa. The system should restart automatically after
the transition. This transition can take up to half a minute or less.
2.2.2 Advanced information (PumpScanner)
2.2.2.1 Analog Input 1 Error & Analog Input 2 Error
A wrong value “out of range” of the analog input (e.g. Pressure Sensor) is very often due to either a
defective / shorted analog input or a defective I/O Board. Testing each of them can help determine
which component is defective.
Measure the current of the connected Pressure Sensor (this should be between 4 mA –20
mA). Anything outside this range means that the analog sensor is defective and needs to be
replaced. The I/O Board may need to be replaced as well.

Page 19 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
24 V should be measured at the terminals 9 and 14 or 11 and 14 after disconnecting the
Pressure Sensor. If there is no voltage or a voltage below 24 V then the I/O Board is
defective and needs to be replaced.
Check the condition of the Surge Protector for the specific input if used.
2.2.2.2 Overtemperature
The Controller stops or run at a reduced power level when the device temperature gets extremely
high. This happens when the ventilation is insufficient (encased Controller for e.g.) or if the fan is
broken. The Controller will go back to normal operation when the temperature level drop below the
max allowed ambient temperature 50°C.
2.2.2.3 igbt overtemperature
The Controller stops or reduced the power level when the heatsink temperature get too high. This
happens when the ventilation is insufficient (encased Controller for e.g.) or if the fan is broken. The
Controller will go back to normal operation when the temperature level of the heatsink drop below
70°C.
2.2.2.4 mmpt overtemperature
The controller stops the pump because the main board temperature gets too high. This happens
when the ventilation is insufficient (encased Controller for e.g.) or if the fan is defective. The
Controller will go back to normal operation when the temperature drops back to normal.
2.2.2.5 PSU overtemperature
The PSk2 Controller stops the SmartPSU operation due to a high device temperature detected in the
PSU. In this case the system will continue to run from solar only. This happens when the ventilation is
insufficient (encased SmartPSU for e.g.) or if the fan is broken. The system will run again from PSU
when the temperature drops back to normal.
2.2.2.6 PSU not ready
This error occurs when the SmartPSU is not able to connect the auxiliary AC power successfully to the
PSk2 Controller. The error can be related and be result of a temporarily bad or unstable AC power
quality. When the SmartPSU permanently runs into this error, it may need repair.
As first testing the AC source quality should be inspected, an inefficient grid will frequently end in this
error. A “Weak Grid Mode” option can be activated for specific situations, please contact LORENTZ
support.

Page 20 / 22
BERNT LORENTZ GmbH
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel [phone], www.lorentz.de
Troubleshooting Guide for PSk2-7 to PSk2-40 pump systems
Version: V200925
All specifications and information are given with good intent, errors are possible and products may be subject to change without
notice. Pictures may differ from actual products depending on local market requirements and regulations.
2.2.2.7 PSU Phase Missing
The PSk2 Controller detected that at least one of the three AC phases that are connected to the
SmartPSU has a problem. The grid status needs to be checked.
2.2.2.8 PSU input frequency low
The PSk2 Controller has detected a too low frequency (below 50 Hz or 60 Hz) at the AC input of the
SmartPSU. This can be related to a temporarily bad or unstable AC power quality.
2.2.2.9 No communication with the PSU
The PSk2 Controller cannot communicate successfully with the SmartPSU. This can be the case when
the SmartPSU is not supplied with AC power or if the communication cable between the SmartPSU
and the PSk2 Controller is not correctly installed or defective.
2.2.2.10 Internal comm error (mmpt)
The PSk2 Controller stops due to a problem in the Controller main board and need to be replaced.
2.2.2.11 Internal comm error (Bt)
The PSk2 Controller main board is defective and need to be replaced.
2.2.2.12 PSU ext Temp Sensor
The heatsink temperature sensor of the SmartPSU has failed and need to be repaired. In this case the
pump system will run on solar power only.
2.2.2.13 igbt overcurrent
The PSk2 Controller stopped the pump due to a high current detected at the Controller output. This
can be related to multiples root causes:
Causes:
Bad cable splicing
Loose phase
Short circuit
Blocked motor / pump
Overtemperature