Ledvance LT-50K F2 User manual

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USER MANUAL
LEDVANCE THREE PHASE INVERTER
LT-(50-60)K F2
LEDVANCE.COM

2
CONTENTS
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
INTRODUCTION
PRODUCT DESCRIPTION ______________________________________________________________________2
PACKAGING__________________________________________________________________________________3
SAFETY INSTRUCTIONS
SAFETY SYMBOLS ____________________________________________________________________________4
GENERAL SAFETY INSTRUCTIONS ______________________________________________________________4
NOTICE FOR USE _____________________________________________________________________________5
NOTICE FOR DISPOSAL________________________________________________________________________5
ENVIRONMENTAL CONSIDERATIONS ___________________________________________________________6
INSTALLATION
OTHER ENVIRONMENTAL CONSIDERATIONS ___________________________________________________7
PRODUCT HANDLING _________________________________________________________________________8
MOUNTING THE INVERTER_____________________________________________________________________9
WALL MOUNTING ___________________________________________________________________________ 10
RACK MOUNTING___________________________________________________________________________ 11
INSTALL MOUNTING PLATE _________________________________________________________________ 12
ELECTRICAL CONNECTIONS _________________________________________________________________ 14
GROUNDING _______________________________________________________________________________ 15
CONNECT PV SIDE OF INVERTER ____________________________________________________________ 17
DC CONNECTION HIGH VOLTAGE DANGER NOTICE ____________________________________________ 19
CONNECT GRID SIDE OF INVERTER ___________________________________________________________ 19
OVER-CURRENT PROTECTION DEVICE (OCPD) FOR THE AC SIDE ________________________________ 19
CONNECTING THE INVERTER TO THE UTILITY GRID __________________________________________ 20
WIRING PROCEDURE _______________________________________________________________________ 20
COMMUNICATION & MONITIORING
INVERTER MONITORING CONNECTION _______________________________________________________ 25
MONITORING FOR A SINGLE INVERTER_______________________________________________________ 25
MONITORING FOR MULTIPLE INVERTERS_____________________________________________________ 25
DRM CONNECTION/ LOGIC INTERFACE CONNECTION __________________________________________ 26
METER CONNECTION _______________________________________________________________________ 28
COMMISSIONING
SELECTING THE APPROPRIATE GRID STANDARD _____________________________________________ 30
CHANGING THE GRID STANDARD ___________________________________________________________ 30

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CONTENTS
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
SETTING A CUSTOM GRID STANDARD _______________________________________________________ 31
PRELIMINARY CHECKS _____________________________________________________________________ 31
DC CONNECTIONS__________________________________________________________________________ 31
AC CONNECTIONS__________________________________________________________________________ 32
DC CONFIGURATION ________________________________________________________________________ 32
AC CONFIGURATION ________________________________________________________________________ 32
START-UP AND SHUTDOWN
START-UP PROCEDURE ____________________________________________________________________ 33
SHUTDOWN PROCEDURE___________________________________________________________________ 33
NORMAL OPERATION
MAIN MENU ________________________________________________________________________________ 34
INFORMATION ______________________________________________________________________________ 34
SETTINGS__________________________________________________________________________________ 36
ADVANCED INFO - TECHNICIANS ONLY ______________________________________________________ 37
ADVANCED SETTINGS - TECHNICIANS ONLY __________________________________________________ 40
SWITCH ON/OFF ___________________________________________________________________________ 41
RESTORE SETTINGS________________________________________________________________________ 44
INTERNAL EPM SET _________________________________________________________________________ 44
RESTART HMI ______________________________________________________________________________ 48
FAN TEST __________________________________________________________________________________ 49
DSP UPDATE _______________________________________________________________________________ 49
COMPENSATION SET________________________________________________________________________ 49
I/V CURVE__________________________________________________________________________________ 50
AFCI FUNCTION ____________________________________________________________________________ 51
MAINTENANCE
NIGHT TIME PID-RECOVERY FUNCTION _______________________________________________________ 52
FAN MAINTENANCE _________________________________________________________________________ 53
TROUBLESHOOTING
INVERTER MESSAGES ______________________________________________________________________ 54
APPENDIX
GRID STANDARD SELECTION GUIDE _________________________________________________________ 58

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INTRODUCTION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
PRODUCT DESCRIPTION
Ledvance three phase string inverters covered in this user instruction are suitable for residential, commercial and
utility scale projects. This manual covers the three phase inverter model listed below:
LT-50K F2, LT-60K F2.
DC Switch
4pin COM Port
AC output
DC input 16pin COM Port
Bottom view
LED lights
LCD
display
4 buttons
Front view

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INTRODUCTION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
PACKAGING
When you receive the inverter, please ensure that all the parts listed below are included:
If anything is missing, please contact your local Ledvance distributor.
AC terminal cover x1
Quick Installation Manual x1
Inverter x1
Back plate x1
Cross screws (M4*14) x4
Cross Recessed
Hexagon Bolt (M6*12) x2
16pin COM Connector x1
Unlocking tool x1
DC connectors
50K x10, 60K x12

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SAFETY INSTRUCTIONS
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
SAFETY SYMBOLS
Safety symbols used in this manual, which highlight potential safety risks and important safety information, are
listed as follows:
DANGER
WARNING symbol indicates important safety instructions, which if not correctly
followed, could result in serious injury or death.
NOTE
“Note” provides tips that are valuable for the optimal operation of your product.
CAUTION
CAUTION, RISK OF ELECTRIC SHOCK symbol indicates important safety
instructions, which if not correctly followed, could result in electric shock.
CAUTION
CAUTION, HOT SURFACE symbol indicates safety instructions, which if not
correctly followed, could result in burns.
GENERAL SAFETY INSTRUCTIONS
WARNING
Please do not connect PV array positive(+) or negative(-) to ground, it could cause
serious damage to the inverter.
WARNING
Electrical installations must be done in accordance with the local and national
electrical safety standards.
WARNING
To reduce the risk of fire, over-current protective devices (OCPD) are required for
circuits connected to the Inverter.
The DC OCPD shall be installed per local requirements. All photovoltaic source
and output circuit conductors shall have disconnecting equipment that comply
with the NEC Article 690, Part II. All Ledvance three phase inverters feature an
integrated DC switch
CAUTION
Risk of electric shock. Do not remove cover. There is no user serviceable parts
inside. Refer servicing to qualified and accredited service technicians.

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SAFETY INSTRUCTIONS
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
CAUTION
The PV array (Solar panels) supplies a DC voltage when they are exposed to
sunlight.
CAUTION
Risk of electric shock from energy stored in capacitors of the Inverter.
Do not remove cover for 5 minutes after disconnecting all power sources (service
technician only). Warranty may be voided if the cover is removed without
authorization.
CAUTION
The surface temperature of the inverter can exceed 75°C(167°F).
To avoid risk of burns, DO NOT touch the surface when inverter is operating. The
inverter must be installed out of reach of children.
NOTICE FOR USE
The inverter has been constructed according to the applicable safety and technical guidelines. Use the inverter in
installations that meet the following specifications ONLY:
- Permanent installation is required.
- The electrical installation must meet all the applicable regulations and standards.
- The inverter must be installed according to the instructions stated in this manual.
- The inverter must be installed according to the correct technical specifications.
- To start-up the inverter, the Grid Supply Main Switch (AC) must be switched on, before the solar panel's DC
isolator shall be switched on. To stop the inverter, the Grid Supply Main Switch (AC) must be switched off before
the solar panel's DC isolator shall be switched off.
NOTICE FOR DISPOSAL
This product shall not be disposed of with household waste. They should be segregated
and brought to an appropriate collection point to enable recycling and avoid potential
impacts on the environment and human health. Local rules in waste management shall be
respected .

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
ENVIRONMENTAL CONSIDERATIONS
Select a location for the inverter
When selecting a location for the inverter, consider the following:
WARNING: RISK OF FIRE
Despite careful construction, electrical devices can cause fire.
-Do not install the inverter in areas containing highly flammable materials or gases.
-Do not install the inverter in potentially explosive atmosphere.
-The mounting structure where the inverter is installed must be fireproof.
-The temperature of the inverter heat-sink can reach 75°C.
-The inverter is designed to work in an ambient temperature range between -25 to 60°C.
-If multiple inverters are installed on site, a minimum clearance of 500mm should be kept between each
inverter and all other mounted equipment. The bottom of the inverter should be at least 800mm above of
the ground or floor.
-The LED status indicator lights and the LCD located on the inverter's front panel should not be blocked.
-Adequate ventilation must be present if the inverter is to be installed in a confined space.
NOTE
Nothing should be stored on or placed against the inverter.
500mm
500mm
500mm
800mm
Distances required between inverters

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
OTHER ENVIRONMENTAL CONSIDERATIONS
Consult technical data
Consult the specifications section for additional environmental conditions (protection rating, temperature,
humidity, altitude, etc.).
Vertical wall installation
This model of Ledvance inverter should be mounted vertically (90 degrees or backwards 15 degrees).
Avoiding direct sunlight
Installation of the inverter in any location exposed to direct sunlight should to be avoided. Direct exposure to
sunlight could cause:
Power output limitation (with a resulting decreased energy production by the system).
Premature wear of the electrical/electromechanical components.
Premature wear of the mechanical components (gaskets) and user interface.
Recommended installation locations

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
Air circulation
Do not install in small, closed rooms where air cannot freely circulate. To prevent overheating, always ensure that
the air flow around the inverter is not blocked.
Flammable substances
Do not install near flammable substances. Maintain a minimum distance of three meters (ten feet) from such
substances.
Living area
Do not install in a living area where the prolonged presence of people or animals is expected. Depending on
where the inverter is installed (for example: the type of surface around the inverter, the general properties of the
room, etc.) and the quality of the electricity supply, the sound level from the inverter can be quite high.
PRODUCT HANDLING
Please review the instruction below for handling the inverter:
-The red circles below denote cutouts on the product package.
Push in the cutouts to form handles for moving the inverter .
-Two people are required to remove the inverter from the shipping box. Use the handles integrated into
the heat sink to remove the inverter from the carton.
Handles used to move the inverter shown circled in red

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
WARNING
Despite careful construction, electrical devices can cause fires.
-Do not install the inverter in areas containing highly flammable materials or gases.
-Do not install the inverter in potentially explosive atmospheres.
-The mounting structure where the inverter is installed must be fireproof.
MOUNTING THE INVERTER
The inverter can be mounted to the wall or metal array racking. The mounting holes should be
consistent with the size of the bracket or the dimensions.
Inverter handles
unit:
mm
Inverter wall mounting

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
WALL MOUNTING
The steps to mount the inverter are listed below.
1. Drill holes for expansion bolt (M10*90) based on the hole diameter of bracket using a precision drill keeping
the drill perpendicular to the wall. Max depth is 90mm.
2. Make sure the bracket is horizontal and the mounting holes are marked correctly. Drill the holes into the wall at
your marks.
3. Use the suitable mounting screws to attach the bracket on the wall.
Lift the inverter and hang it on the bracket, and then slide down to make sure they match perfectly.
Use screws in the packaging to fix the inverter to the mount bracket.
Torque
：
30-35NM
Mounting Bracket
Inverter wall mounting
Mounting screws
Torque
：2-3NM
Fix the inverter
Install the inverter

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
RACK MOUNTING
The steps to mount the rack are listed below:
Select a location for the inverter
-With an IP66 protection rating, the inverter can be installed both outdoors and indoors.
-When the inverter is running, the temperature of the chassis and heat sink will be higher. Do not install
the inverter in a location that you accidentally touch.
-Do not install the inverter in a place where are stored a flammable or explosive material.
Installation angle
Please install the inverter vertically. If the inverter cannot be mounted vertically, it may be tilted backward to 15
degrees from vertical.
Vertical
≤15°
Backward
Correct installation angle
√√
Upside
down
Leaning
forward
Wrong installation angle
××

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
INSTALL MOUNTING PLATE
Remove the bracket and fasteners from the packaging. Mark the position for hole, drilling according to the hole
positions of the bracket.
Drill the marked holes. It is recommended to apply anti-corrosive paint at the hole for corrosion protection
Mark the position for hole
Drill hole

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
Align the mounting plate with the holes, insert the hexagon bolt (M10X40) through the mounting plate into the
hole. Secure the bracket to the metal frame firmly.
Torque the nut to 36FT-LB (35NM).
Lift the inverter above the bracket and then slide down to make sure they match perfectly.
Construction bolt
Mount the inverter

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
ELECTRICAL CONNECTIONS
Inverter design uses PV style quick-connect terminal. The top cover does not need to be opened during DC
electrical connection. The labels located at the bottom of the inverter are described in a table below. All electrical
connections are suitable for local or national standard.
The electrical connection of the inverter must follow the steps listed below:
1. Switch the Grid Supply Main Switch (AC) OFF.
2. Switch the DC Isolator OFF.
3. Connect the inverter to the grid.
4. Assemble PV connector and connect to the inverter.
Parts Connection Cable size Torque
DC terminal PV strings
4- 6mm² NA
Ground terminal AC ground
25- 50mm²
5- 6N.m
Grid terminal Grid
35- 70mm²
10-20N.m
16pin COM Port Communication cable
0.75- 3mm²
0.4- 0.6N.m
4pin COM Port Datalogging stick NA NA

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
GROUNDING
To effectively protect the inverter, two grounding methods must be performed.
Connect the AC grounding cable.
Connect the external grounding terminal.
To connect the grounding terminal on the heat sink, please follow the steps below:
1. Prepare the grounding cable: recommend to use in the outdoor is a copper-core cable. The grounding
wire should be at least half size of the hot wires.
2. Prepare OT terminals: M10.
Important
For multiple inverters in parallel, all inverters should be connected to the same ground point
to eliminate the possibility of a voltage potential existing between inverter grounds.
3. Strip the ground cable insulation to a suitable length.
Important
B (insulation stripping length) is 2mm~3mm longer than A (OT cable terminal crimping area).
Suitable length

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
4. Insert the stripped wire into the OT terminal crimping area and use the hydraulic clamp to crimp the
terminal to the wire.
Important
After crimping the terminal to the wire, inspect the connection to ensure the terminal is
solidly crimped to the wire.
5. Remove the screw from the heat sink ground point.
6. Connect the grounding cable to the grounding point on the heat sink, and tighten the grounding screw,
Torque is 5-6Nm.
Important
For improving anti-corrosion performance, after grounding cable is installed, apply silicone
or paint.
Strip wire
Grounding screw
Fixed cable

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
CONNECT PV SIDE OF INVERTER
Please see table in “Electrical connections” section for acceptable wire size for DC connections. Wire
must be copper only. The steps to assemble the DC connectors are listed as follows:
1. Trip off the DC wire for about 7mm. Disassemble the connector cap nut.
2. Insert the wire into the connector cap nut and contact pin.
3. Crimp the contact pin to the wire using a proper wire crimper.
4. Insert metal connector into top of connector, and tighten nut with torque 3-4 Nm.
5. Measure PV voltage of DC input with multimeter, verify DC input cable polarity, and ensure each
string voltage is in range of inverter operation. Connect DC connector with inverter until hearing a
slight clicking sound indicating successful connection.
WARNING
Before connecting the inverter, make sure the PV array open circuit voltage is within
the limit of the inverter. Otherwise, the inverter could be damaged.
WARNING
DO NOT connect the PV array positive or PV array negative cable to ground. This can
cause serious damage to the inverter
WARNING
MAKE SURE the polarity of the PV array output conductors matches the DC- and DC+
terminal labels before connecting these conductors to the terminals of the inverter.
Disassemble the connector cap nut
Insert the wire into the connector
cap nut and contact pin
Crimping plier
Crimp the contact pin to the wire
Connector with cap nut screwed on

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INSTALLATION
Document No.: LDV-LT-50/60-F2-01-UM_11.2023
Cable type
Traverse area (mm²)
Outside diameter of cable
(mm)
Range
Recommended value
Industry generic PV cable
(model: PV1-F)
4.0~6.0
(12~10AWG)
4.0
(12AWG)
5.5~9.0
CAUTION
If DC inputs are accidently reversely connected or inverter is faulty or not working properly, it is NOT
allowed to turn off the DC switch. Otherwise it may cause DC arc and damage the inverter or even
lead to a fire disaster.
The correct actions are:
*Use a clip-on ammeter to measure the DC string current.
*If it is above 0.5A, please wait for the solar irradiance reduces until the current decreases to below
0.5A.
*Only after the current is below 0.5A, you are allowed to turn off the DC switches and disconnect
the PV strings.
* In order to completely eliminate the possibility of failure, please disconnect the PV strings after
turning off the DC switch to avoid secondary failures due to continuous PV energy on the next day.
Please note that any damages due to wrong operations are not covered in the device warranty.
Requirements for the PV modules per MPPT input:
●All PV modules must be of the same type and power rating.
●Please ensure that PV strings are evenly connected to the inverter and try to use all of the MPPT trackers.
●All PV modules must be aligned and tilted identically.
●The open-circuit voltage of the PV array must never exceed the maximum input voltage of the inverter, even at
the coldest expected temperature (see section “Specifications” for input current and voltage requirements).
●Each string connected to a single MPPT must consist of the same number of series-connected PV modules.
Multimeter measurement
Connect the DC connectors to the inverter