ACS contsys Sonicont USN4SP User manual

01.18
Technical manual
Applications
Non-contact level and volume measurement or
ow measurement at open channels and measuring weirs
for
• Water and waste water sector
• Process industry
• Environmental technology
• Storage tanks, storage bunkers, silos
Sonicont USN4SP
Ultrasonic level transmitter / level switch
Non-contact measurement of lling levels
in liquids, pastes and coarse bulk materials
Main features
Wide range of applications
• Measuring ranges up to 8m in liquids and bulk materials
• Wide process temperature range –40°C to +85°C
• High protection class IP65 / IP67
• Wide environmental temperature range –20°C to +70°C
High accuracy – characteristic deviation ≤ 0,2% of measuring
range
Integrated evaluation electronic
• Graphic display, keyboard
• 4x PNP switch output
• 1x current output 0/4…20mA – voltage output 0…10V
• Measure data memory for more than 500.000 measuring
values
• Battery powered data logger function
• Bluetooth-Interface
• Connector plug M12
High operating comfort
• Enclosure and display rotatable for optimal operability in
each installation position
• High contrast high brightness TFT-LCD display for best
readability
• 3-key operation without additional assistance with tactile
feedback
• Easy handling by clear menu navigation
• Extensive diagnostic functions for system analysis

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You have purchased a high-grade and modern measuring device of ACS-CONTROL-SYSTEM GmbH.
We want to give thanks for your purchase and for your condence to us.
The actual technical manual includes instructions for installation, electrical connection and inauguration,
as well as the technical data of the device.
Modications, that answer the purpose of the technical progress, are reserved by
ACS-CONTROL-SYSTEM GmbH without prior notice.
If a question occurs, that can‘t be answered by the listed informations, please call on our technicians
team in Eggenfelden Tel: [phone] or [email protected]
All rights reserved

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Index
1 Systemdescription................................................4
1.1 Intended use ................................................... 4
1.2 Field of application ........................................... 4
1.3 System components ......................................... 4
1.4 Function ......................................................... 5
2 Safety notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1 Operational safety ............................................ 6
2.2 Installation, connection, commissioning, operation6
3 Installation......................................................7
3.1 Installation place ............................................. 7
3.2 Installation notes ............................................. 9
4 Electricalconnection .............................................11
4.1 Potential equalization - earthing ......................... 11
4.2 Connection cable ............................................. 11
4.3 Supply voltage ................................................ 11
4.4 Switch output .................................................. 11
4.5 Analogue output .............................................. 12
4.6 Connection scheme .......................................... 12
5 Operation......................................................14
5.1 Operation and display parts ............................... 14
5.2 Function scheme .............................................. 14
5.3 Menu structure ................................................ 16
5.4 Navigation ...................................................... 17
5.5 Output ........................................................... 18
5.6 Basic setting ................................................... 25
5.7 Display ........................................................... 31
5.8 Simulation – E ................................................. 37
5.9 Diagnosis ........................................................ 38
5.10 Data .............................................................. 41
5.11 Start-up procedure ........................................... 45
5.12 Software history .............................................. 48
6 Service........................................................49
6.1 Maintenance .................................................... 49
6.2 Dismounting.................................................... 49
6.3 Repair ............................................................ 49
6.4 Return ............................................................ 49
6.5 Disposal ......................................................... 49
7 TechnicalData..................................................50
7.1 Auxiliary power supply ...................................... 50
7.2 Input.............................................................. 50
7.3 Output ........................................................... 51
7.4 Measuring accuracy .......................................... 51
7.5 Interface Bluetooth .......................................... 52
7.6 Data memory .................................................. 52
7.7 Clock .............................................................. 52
7.8 Process conditions ............................................ 52
7.9 Environmental conditions .................................. 52
7.10 Materials - process wetted ................................ 52
7.11 Materials - not process wetted ........................... 52
8 Dimensiondrawings..............................................53
8.1 Terminal enclosure ........................................... 53
8.2 Process connection ........................................... 53
9 Orderinginformation.............................................56
9.1 Order code ...................................................... 56
9.2 Additional options ............................................ 57
9.3 Accessories ..................................................... 57

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1 System description
1.1 Intended use
The device is an electronic level transmitter / level switch for monitoring, control as well as continuous
measurement of lling levels in liquids, pastes and coarse bulk materials.
Additional application elds are volume or ow measurement.
The operational reliability of the device is ensured only at the intended use.
1.2 Field of application
Due to the device construction with
• Measuring ranges of 2m / 5m / 8m
• Process temperatures from –40°C to +85°C
• Process materials PVDF / CrNi-steel / EPDM
as well as the availability of extensive equipment and functionality
• Predened vessel types for fast commissioning
• Predened linearization curves for volume and ow measurement
• Integrated error signal suppression for adaption the installation situation
• Integrated compensation of the process temperature
• Limit value function for two-point control
• Pump control function
• Impulse output function for quantity counter
• Error indication function for error monitoring
the device is especially suitable for the use for
• Level and volume measurement
• Flow measurement at open channels and measuring weirs
for
• Water and waste water sector
• Process industry
• Environmental technology
• Storage tanks, storage bunkers, silos
The device is suitable for demanding measuring requirements.
Due to its high accuracy and the high exibility of conguration, the device can be suited a wide
variety of applications.
The robust design and the high-quality workmanship turns the device into a very high quality product,
which even the most adverse environmental conditions cannot aect, whether low temperatures when
used outdoors, high shock and vibration or aggressive media.
A captive laser marking of the type label ensures the identiability throughout the entire lifetime of
the device.
Obviously is the optional marking of a measurement point designation resp. TAG, a customer label or
of a neutral type label, of course also per laser marking.
A LABS-free resp. silicone-free version, a factory calibration with calibration certicate and a customer
specic conguration resp. preset is also optionally available like a material test certicate EN10204
3.1.
Customer specic special versions can be realized on request, e.g.
• software adaption (menu navigation, special functions, etc.),
• changed terminal assignment resp. connector orientation,
• design adaption of the user surface,
• special designs for the process connection
1.3 System components
The device consists on the components:
• Sensor tip with ultrasonic sensor and temperature sensor.
• Process connection, for installation into the container cover or a bracket.
• Terminal enclosure, rotatable by 300°, for protection of the integrated signal processing
electronic and for the electrical connection.
The components cannot be separated by the user.

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1.4 Function
1.4.1Measuring principle
The transducer of the ultrasonic sensor transmits ultrasonic pulses to the product surface.
These pulses are reected by product surface and received back by the transducer as echoes.
The running time of the ultrasonic pulses from emission to reception is proportional to the distance
and hence the level.
Because the running time of the ultrasonic pulses is highly dependent on the environmental
temperature, the temperature dependent change of sound velocity must be compensated.
A temperature sensor, which is integrated in the ultrasonic sensor, is used for the temperature
measurement.
1.4.2Signal processing
The running time determined level is processed by the integrated evaluation electronic according to
the respective preferences:
• The measuring value is monitored by four PNP switch outputs for exceedance of limit values.
• The measuring value is converted into a continuous current signal 0/4...20mA or voltage signal
0…10V.
• The measuring value is diagrammed at the high brightness and high contrast TFT-LCD display,
whereby it can be selected between dierent display styles (digital value / manometer / chart / bar
graph).
• All settings can be changed comfortable and easy by a 3-key operation without additional
assistance with tactile feedback.
The device includes numerous functions to the adaption to nearly each measuring task:
• The interference echo suppression function ensures that interference echoes (e.g. from edges,
welded joints and installations) are not interpreted as a level signal.
• Integrated unit conversion
• Peak value memory minimum – maximum
• Error memory for fast failure analysis
• Various exible switch functions
• Error indication function to switch output, current/voltage output and display
• Simulation of the switch outputs and the current/voltage output
In the internal ring memory more than 500.000 measuring values can be recorded durable.
At the data logger function these measuring values are marked with a battery powered time stamp.
By the Bluetooth interface recorded measuring values can be downloaded.

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2 Safety notes
2.1 Operational safety
The device is safely built and tested according to state-of-the-art technology and has left the factory in
perfect condition as regards technical safety.
The device meets the legal requirements of all relevant EU directives. This is conrmed by attaching
the CE mark.
This measuring device meets article 4 (3) of the EU directive 2014/68/EU (pressure equipment device
directive) and is designed and produced in good engineer practice.
2.2 Installation, connection, commissioning, operation
Installation, electrical connection, commissioning and operation of the device must be made by a
qualied and authorized expert according to the information’s in this technical manual and the relevant
standards and rules. This expert must have read and understood this technical manual and especially
the safety notes.
The device may only be used within the permitted operation limits that are listed in this technical
manual. Every use besides these limits as agreed can lead to serious dangers.
The materials of the device must be checked for compatibility with the respective application
requirements (contacting materials, process temperature) before use. An unsuitable material can lead
to damage, abnormal behavior or destruction of the device and to the resulting dangers.
The sensors may not be used as sole device for prevention of dangerous conditions in machines and
plants.
Using the device in a manner that does not fall within the scope of its intended use, disregarding
this instruction, using under-qualied personnel, or making unauthorized alterations releases the
manufacturer from liability for any resulting damage. This renders the manufacturer‘s warranty null
and void.

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3 Installation
The correct function of the device within the specic technical data can only be guaranteed, if
the permitted process and environmental temperatures (see chapter „Technical data“) will not be
exceeded.
3.1 Installation place
3.1.1Level measurement
• Do not install the sensor in the middle of the tank (C). We recommend leaving a distance between
the sensor and the tank wall (A) measuring 1/6 of the tank diameter. In vessels with conical
bottom it can be advantageous to mount the sensor in the center of the vessel, as measurement is
then possible down to the lowest point of the vessel bottom.
• Use a protective cover, in order to protect the device from direct sun or rain (B).
• Avoid measurements through the lling curtain (D). Through the action of lling, stirring and other
processes in the vessel, dense foams which considerably damp the emitted signals may form on
the product surface. If foams are causing measurement errors, the sensor should be used in a
standpipe.
• If there are strong air currents in the vessel, e.g. due to strong winds in outdoor installations or air
turbulence, e.g. by cyclone extraction, the device should be mount in a standpipe.
• Make sure that equipment (E) such as limit switches, temperature sensors, etc. are not located
within the emitting angle α. In particular, symmetrical equipment (F) such as heating coils, baes
etc. can inuence measurement. If large vessel installations such as struts or supports cause false
echoes, these can be attenuated through supplementary measures. Small, inclined sheet metal or
plastic baes above the installations scatter the ultrasonic signals and avoid direct false echoes.
• Align the sensor so that it is vertical to the product surface (G).
• Never install two ultrasonic measuring devices in a tank, as the two signals may aect each other.
• To estimate the detection range, use the 3 dB emitting angle α, which can be found in the chapter
“Technical Data - Input”. This radius of the detection range at an arbitrary distance Lx can be
calculated by the following term: rx = tan (α / 2) * Lx
Example values for Lx and rx can be found in the chapter “Technical Data - Input”.

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3.1.2Installation in narrow shafts
• In narrow shafts with strong interference echoes, we recommend using a stand pipe resp. an
ultrasound guide pipe (e.g. PE or PVC wastewater pipe) with a minimum diameter of 100mm.
• Make sure that the pipe is not soiled by accumulated dirt. If necessary, clean the pipe at regular
intervals.
• The pipe must be provided with a sucient venting hole (A) (Ø 5…10mm) at the upper edge.
3.1.3Flow measurement
Example: Triangular weir
• Install the device at the inow side, as close above the maximum water level Hmax as possible
(take into account the blocking distance BD).
• Position the device in the middle of the channel or weir.
• Align the sensor membrane parallel to the water surface.
• Keep to the installation distance of the channel or weir.

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3.2 Installation notes
• Drive the system pressure free prior installation resp. deinstallation of the sensor.
• The screw-in of the thread process connection by using the terminal enclosure, the connection plug
resp. the connection cable is not permitted.
• The tightening of the thread process connection may only be done at the hexagon by a suitable
spanner and with the maximum permitted torque strength (see chapter „Technical data“).
• The housing can be rotated every time, also at operation, mechanically by 300°.
• The display can be rotated every time electrically by 180°.
3.2.1Pressure / vacuum
Gauge pressure in the vessel does not inuence the measuring result. Low pressure or vacuum does,
however, damp the ultrasonic pulses. This inuences the measuring result, particularly if the level is
very low (≤ -0,2bar resp. -20kPa).
3.2.2Vapor pressure
The vapor pressure at 20°C (68°F) gives a hint on the accuracy of the ultrasonic level measurement.
If the vapor pressure at 20°C (68°F) is below 50mbar, ultrasonic level measurement is possible with a
very high accuracy.
This is valid for water, aqueous solutions, water-solid-solutions, dilute acids (e.g. hydrochloric acid,
sulfuric acid), dilute bases (e.g. caustic soda), oils, greases, slurries, pastes, etc.
High vapor pressures or outgassing media (e.g. ethanol, acetone, ammoniac) can inuence the
accuracy.
3.2.3Range
The sensor range is dependent on the measuring conditions.
The maximum range can be found in the chapter “Technical Data - Input”.
3.2.4Blocking distance
If the blocking distance is undershot, it may cause device malfunction.
• Install the device at a height so that the blocking distance BD (see chapter “Technical Data -
Input”) is not undershot, even at maximum ll level Hmax.
• If the medium reaches the transducer, buildup can form on it and cause faulty measurements later
on.

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3.2.5Nozzle installation
Use a pipe nozzle if you cannot maintain the blocking distance in any other way.
• The interior of the nozzle must be smooth and may not contain any edges or welded joints. In
particular, there should be no burr on the inside of the tank side nozzle end.
• To minimize disturbing factors, we recommend an angled socket edge (ideally 45°).
• Note the specied limits for nozzle diameter and length.
Nozzle diameter D Maximum nozzle length L
DN50 / 2“ 80mm
DN80 / 3“ 240mm
DN100 / 4“ 300mm
≥ DN150 / 6“ 400mm
3.2.6Standpipe measurement
By using a standpipe (surge or bypass tube), the inuence of vessel installations, foam generation and
turbulence is excluded.
• Standpipes must extend all the way down to the requested min. level, as measurement is only
possible within the tube.
• The pipe must be provided with a sucient venting hole (A) (Ø 5…10mm) at the upper edge.
• Avoid large gaps and thick welding joints when connecting the tubes.
• Measurement in a standpipe is not recommended for very adhesive products.

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4 Electrical connection
The electrical connection of the device must be carried out according to the respective country specic
standards.
Incorrect installation or adjustment could cause applicationally conditioned risks.
Warning!
The instrument may only be installed if the supply voltage is switched o.
4.1 Potential equalization - earthing
The device must be grounded.
The earthing can be carried out by the metallic process connection.
The metallic parts of the device are electrically connected with the socket of the plug M12.
4.2 Connection cable
Use only shielded signal and measurement wires and install these wires separated from power leading
wires.
Connect the cable shield of a connected cable only at one side to earth, ideally at the installation place
of the device.
4.3 Supply voltage
The voltage applied to the terminal contacts may not exceed the maximum permitted supply voltage
to avoid damage of the electronic.
The maximum permitted supply voltage range is:
Signal 0/4…20mA 9…30VDC
Signal 0…10V 14…30VDC
All connections are reverse polarity protected.
4.4 Switch output
Warning!
Inductive loads at the PNP switch outputs, e.g. relays, contactors or magnetic vents may only be used
with a free-wheeling diode or a RC protection circuit to avoid high voltage peaks.
Note!
For inauguration it is suggested, to deactivate all connected control devices, to avoid unwanted control
reactions.
The load at the PNP switch output will be connected to the terminal +L of the supply voltage by a
semiconductor switch contactless and by this bounce-free.
At an activated switch state a positive signal near supply voltage is feed to the output.
At deactivated switch state and at failure of supply voltage the semiconductor switch is shut o.
The PNP switch output is current limited, overload and short circuit protected.

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4.5 Analogue output
4.5.1Current output – Load resistor
A load resistor, e.g. the measuring shunt of an evaluation device, requires a minimum supply voltage.
Dependent on the connected supply voltage and the maximum output current, it results in a maximum
value for this resistor, where a correct function is still possible.
4.6 Connection scheme
Conductor color standard connection cable M12 – A-coded:
• BN = brown
• WH = white
• BU = blue
• BK = black
• GY = grey
• YE = yellow
• GN = green
• PK = pink
4.6.1Electronic output type M
1x signal 0/4…20mA-0…10V, supply 24VDC
4.6.2Electronic output type K
1x signal 0/4…20mA-0…10V, 2x switch PNP, supply 24VDC

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4.6.3Electronic output type R
1x signal 0/4…20mA-0…10V, 4x switch PNP, supply 24VDC

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5 Operation
5.1 Operation and display parts
A – LCD display
• Display of measuring value, device state and operation menu
B - Key Down
• In the selection menu navigation downwards
• In the set menu decreasing of value
• Used, in combination with the key up, for leaving selection and set menu without applying
changings
• Used, in combination with the key up, for a step backwards one menu item
C - Key Enter/Shift right
• Access to operation menu
• In the selection menu entering the selected sub menu
• In the set menu applying the new value and digit shift right
D - Key Up
• In the selection menu navigation upwards
• In the set menu increasing of value
• Used, in combination with the key down, for leaving selection and set menu without applying
changings
• Used, in combination with the key down, for a step backwards one menu item
5.2 Function scheme
A – Commissioning
B – Operating mode (4..20mA/0..20mA/0..10V)
C – Pulse rate
D – Echo loss
E – Damping
F – Min/Max adjustment > e.g. 1,8..0,4m = 0..100%
U – Limit min/max

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I1 - Linearization > Level - display scaling e.g. 0,4..1,8 m = 0..2000 m3
I2 - Linearization > Percent 0..100 % - Lin. Percent 0..100 %
I3 - No linearization
J - Signal output > e.g. 0..100 % = 4..20 mA resp. 0..20 mA resp. 0..10V
R – Signal output > Percent 0..100 % - Lin. Percent 0..100 %
K - Error signal evaluation
L1 - Switch / reset switch point S1
L2 - Switch / reset switch point S2
L3 - Switch / reset switch point S3
L4 - Switch / reset switch point S4
M1 - Error indication function S1
M2 - Error indication function S2
M3 - Error indication function S3
M4 - Error indication function S4
T – Impulse output S1 for quantity counter
N1 - Display scaling > Distance e.g. 0..100 % = 1,8..0,4 m
N2 - Display scaling > Fill level e.g. 0..100 % = 0,4..1,8 m
N3 - Display scaling > Percent 0..100 % = 0..100 %
N4 - Display scaling > scaled e.g. 0..100 % = 0..2000
N5 - Display scaling > Signal Output 0..100 % = 4..20 mA resp. 0..20 mA resp. 0..10 V
O - Display unit > at display scaling scaled e.g. m3
P - Error indication display
S – Quantity counter > e.g. m3/h, l/min
Q1 - Display - Distance e.g. 1,8..0,4 m
Q2 - Display - Fill level e.g. 0,4..1,8 m
Q3 - Display - Percent 0..100 %
Q4 - Display - scaled e.g. 0..2000 m3
Q5 - Display - Signal Output 4..20 mA resp. 0..20 mA resp. 0..10 V

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5.3 Menu structure
The entrance to the dierent function areas of the selection and set menu layer is done by the main
menu (push the key Enter/Shift right for 3 seconds).
If failures are registered (see chapter diagnose/failure), these are indicated prior the jump into the
main menu.
By the key Enter/Shift right the failure indication will be canceled.
The symbol E at a menu item indicates its position in the extended menu structure.
This extended menu structure can be shown in the submenu display by the menu item menu
structure.
• Submenu output
Settings for the function of the switch outputs and the signal output.
• Submenu basic setting
Settings for the basic adaption of the device to the measuring task, e.g. adjustment, damping and
linearization.
• Submenu display
Settings for the adaption of the measuring value indication to the measuring task, e.g. measuring
value scaling, display type, menu language and also password protection.
• Submenu simulation
Settings for the simulation of the switch outputs and the signal output, e.g. for inauguration or
also for failure analysis.
• Submenu diagnose
Multiple information to the historical measuring activity and the device, that can be useful for
system surveillance or also for failure analysis.
• Submenu data
Settings for the measuring value recording and the data transmission by Bluetooth.

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5.4 Navigation
The navigation in a submenu and in a selection window is done by the keys Up and Down.
The selection of a submenu and the selection of a setting in a selection menu is done by the key
Enter/Shift right.
The jump backward from a submenu to the higher-level menu is done by the menu item back or by
the simultaneous pushing the keys Up and Down.
The leaving of a selection menu without applying the changings is done by the simultaneous pushing
the keys Up and Down.
The input of a value or text in a set menu is done digit by digit.
For the changing of the selected digit the keys Up and Down are used.
For the changing of the digit the key Enter/Shift right is used.
The applying of a set value resp. text is done by pushing the key Enter/Shift right for 3 seconds.
The leaving of an set menu without applying a value resp. text is done by the simultaneous pushing
the keys Up and Down.
After 5 minutes of inactivity the active submenu resp. selection menu will automatically be left and a
change to the measuring value indication is executed.
A jump backward is not executed from an active set menu.

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5.5 Output
The symbol E at a menu item indicates its position in the extended menu structure.
This extended menu structure can be shown in the submenu display by the menu item menu
structure.
A – Hysteresis function
B – Window function
C – Error indication function
D – Impulse function
F – Pump function
5.5.1Switch output S1 / S2 / S3 / S4
5.5.1.1 Enabled
Each switch output can be activated resp. deactivated separately.
Yes
No
Default > Yes

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5.5.1.2 Switch Point / Reset Switch Point
The input values refers to the set display value or acc. to display scaling.
The reset switch point must be lower or equal to the switch point.
At inverse measuring principle, e.g. distance measurement, the reset switch point must be greater or
equal to the switch point.
The input range is limited to the measuring range.
Default > S1 = 20% / S2 = 40% / S3 = 60% / S4 = 80%
5.5.1.3 Switch Delay Time / Reset Switch Delay Time – E
The activation resp. deactivation of the switch output can be biased with a delay time (resolution
0,01s), to realize simple sequence control system.
The input range is indenite.
Default > 0s
5.5.1.4 Function - E
5.5.1.4.1 Hysteresis function S1/S2/S3/S4
The hysteresis function realizes a stable switch state, independent from system conditioned signal
uctuations around the adjusted set point.
It can be used for realizing a signal controlled two-position control.
The switch range is determined by denition of switch point and reset switch point.
In the menu Operating Mode, the working principle of the switch output can be inverted.
• Operating Mode Maximum
The switch output is activated, if the current measuring value overshoots the switch point and if
the set switch point delay time has been expired.
The switch output is deactivated, if the current measuring value undershoots the reset switch
point and if the set reset switch point delay time has been expired.
• Operating Mode Minimum
The switch output is activated, if the current measuring value undershoots the reset switch point
and if the set reset switch point delay time has been expired.
The switch output is deactivated, if the current measuring value overshoots the switch point and if
the set switch point delay time has been expired.
5.5.1.4.2 Window function S1/S2/S3/S4
The window function realizes a signal range – acceptance region –, where the switch output is set to a
denitive switch state.
The switch range is determined by denition of switch point, reset switch point and hysteresis.
In the menu Operating Mode, the working principle of the switch output can be inverted.

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• Operating Mode outside
The switch output is activated, if the current measuring value is outside the area that is dened by
the switch point and the reset switch point and if the set switch point delay time has been expired.
The switch output is deactivated, if the current measuring value is inside the area that is dened
by the switch point and the reset switch point and if the set reset switch point delay time has been
expired.
The hysteresis is positioned inside the area that is dened by the switch point and the reset switch
point.
• Operating Mode inside
The switch output is activated, if the current measuring value is inside the area that is dened by
the switch point and the reset switch point and if the set switch point delay time has been expired.
The switch output is deactivated, if the current measuring value is outside the area that is dened
by the switch point and the reset switch point and if the set reset switch point delay time has been
expired.
The hysteresis is positioned outside the area that is dened by the switch point and the reset
switch point.
5.5.1.4.3 Error Indication Function S1/S2/S3/S4
The switch output is activated, if the device has detected a failure behavior (see chapter diagnose/
failures).
In the menu Operating Mode, the working principle of the switch output can be inverted.
5.5.1.4.4 Impulse Function S1
The switch output generates one switch impulse per calculated quantity value of the quantity
counter (see data/quantity counter).
A warning message is generated, if the quantity counter impulse value is set too low or the
impulse length is set too high. The calculation base for this warning message is the display scaling
at 100%.
• Quantity counter impulse value
Amount of the quantity counter value, for which one switch impulse is generated.
The input range is indenite.
Default > 1
• Impulse length
Duration of a pulse resp. additionally the duration of a pulse pause.
The input range is limited to values from 0,1 to 99999.
Default > 0,5 s
In the menu Operating Mode, the working principle of the switch output can be inverted.