La MARCHE LTI2 Pro Power Inverter Instruction Manual

La MARCHE LTI2 Pro Power Inverter

Important Safety Instructions

Before using this equipment, read all manuals and other documents related to this inverter and other equipment connected to this unit. Always have a copy of an inverter’s manual on file nearby, in a safe place; if a replacement copy of a manual is needed, it can be found at www.lamarchemfg.com.

Electrical Safety

WARNING: Hazardous voltages are present at the input of power systems. The output from inverters and batteries may be low in voltage but can have a very high current capacity that may cause severe or even fatal injury.
When working with any live battery or power system, follow these precautions:

• Never work alone on any live power system, someone should always be close enough to come to your aid.
• Remove personal metal items such as rings, bracelets, necklaces, and watches.
• Wear complete eye protection (with side shields) and clothing protection.
• Always wear gloves and use insulated hand tools.
  • WARNING: Lethal voltages are present within the power system. Parts inside the unit may still be energized even when the unit has been disconnected from the DC input power. Check with a meter before proceeding. Do not touch any parts that are not insulated.
• A licensed electrician should be used in the installation of any unit.
• Always disconnect the unit from the supply, batteries, and loads before performing maintenance or cleaning.
• If the unit is hot-swappable, simply remove it from the shelf for any maintenance or cleaning.
• Always assume that an electrical connection is live and check the connection relative to the ground.
• Be sure that neither liquids nor any wet material come in contact with any internal components.
• Do not operate this unit outside the input and output ratings listed on the unit nameplate.
• Do not use this unit for any purpose not described in the operation manual.

Mechanical Safety

• This unit or parts of the unit may get very hot during normal operation, use care when working nearby.
• Do not expose equipment to rain or snow. Always install in a clean, dry location.
• Do not operate the equipment if it has received a sharp blow, been dropped, or otherwise damaged in any way.
• Do not disassemble this unit. Incorrect re-assembly may result in a risk of electric shock or fire.

Battery Safety

WARNING: Follow all of the battery manufacturer’s safety recommendations when working with or around battery systems. DO NOT smoke or introduce a spark or open flame in the vicinity of a battery. Some batteries generate explosive gases during normal battery operation.

• To reduce the risk of arc, connect, and disconnect the battery only when the unit is off.
• If it is necessary to remove the battery connections, always remove the grounded terminal from the battery first.
• Remove personal metal items such as rings, bracelets, necklaces, and watches.
• Always wear rubber gloves, safety glasses, and a rubber-lined vest/apron when working near a battery.
• Have plenty of fresh water and soap nearby in case the battery electrolyte contacts skin, clothing, or eyes.
• If the battery electrolyte contacts skin or clothing, wash immediately with soap and water.
• If the electrolyte enters the eye, immediately flood the eye with running cold water for at least ten (10) minutes and seek medical attention immediately.
• Do not drop metal on a battery. A spark or short-circuit could occur and could cause an explosion.

Unit Location

• Allow at least 6 inches of free air on all vented surfaces for proper cooling.
• Do not operate this unit in a closed-in area or restrict ventilation in any way.
• Do not set any battery on top of this unit.
• Never allow battery electrolyte to drip on this unit when reading the specific gravity or filling the battery.
• Never place this unit directly above a standard flooded battery. Gases from the battery will corrode and damage equipment.
• A sealed maintenance-free or valve-regulated lead-acid (VRLA) battery may be placed below this equipment.

Check for Damages
Before unpacking the product, note any damage to the shipping container and take pictures. Unpack the product and inspect the exterior and interior of the product for damage. If any damage is observed, take pictures and contact the carrier immediately to file a damage claim. Contact La Marche for a Return Material Authorization number to have the inverter sent back for evaluation and repair.
CAUTION: Failure to properly file a claim for shipping damages or provide a copy of the claim to La Marche, may void warranty service for any physical damages reported for repair.
Returns for Service
Save the original shipping container. If the product needs to be returned for service, it should be packaged in its original shipping container. If the original container is damaged/unavailable, make sure the product is packed with at least three inches of shock-absorbing material to prevent shipping damage. La Marche is not responsible for damage caused by improper packaging of returned products.

Inspection Checklist

• The enclosure exterior and interior are not marred or dented.
• No visible damage to the components.
• All hardware and connections are tight.
• All wire terminations are secure.
• All items on the packing list have been included.

Handling
Equipment can be very heavy with uneven distribution of weight. Use adequate manpower or equipment for handling. Until the equipment is securely mounted, care must be used to prevent equipment from being accidentally tipped over or dropped.

Model Scope/General Description
The LTI2PRO series employs advanced SPWM and CPU control technology to realize precise control, isolated input and output, output soft start, safety, and high efficiency with better reliability. The inverter is equipped with standard features such as pure sine wave output, voltage regulation, under/over–voltage conditions, and overload protection. The LTI2PRO Series is designed to operate at 125VDC input and produce 120 VAC nominal output with 60HZ. The compact 2RU rack-mount enclosure is ideal for data centers, and telecommunications applications.

Understanding the Model Number
The LTI2PRO model number is coded to describe the features that are included. Find the model number on the nomenclature nameplate of the enclosure. Follow the chart below to determine the configuration of the inverter.

Optional Accessories Included in the Inverter
This inverter may have been outfitted with a number of optional accessories or option packages. To determine the options included (if any) refer to the cover page of the manual package. If the manual package that is included with the inverter is no longer available, contact La Marche and provide the model or serial number to receive a list of the included accessories.

Equipment Handling

Storing the LTI2 PRO
If the LTI2 PRO is to be stored for more than a few days after delivery, it should be stored within its shipping container. The location chosen for storage should be within an ambient temperature of -40 to 158° F (-40 to 70°C) with a non-condensing relative humidity of 0 to 95%. Storage should not exceed 2 years due to the limited shelf life of the filter capacitors when they are not in service.
Moving the LTI2 PRO
After careful inspection and upon verification that the LTI2 PRO is undamaged, identify the enclosure style and weight of the inverter. Refer to Table 1 below.

| Output VA| Output Voltage| Output Amps| Input Voltage| Input Current| Dimensions (W x D x H) mm|

Weight

---|---|---|---|---|---|---|---
LTI2 PRO|

1kVA

|

120VAC

|

6.7A

|

48VDC

|

20.8A

|

16.1 x 13.7 x 3.5”

|

33 lbs

3kVA

|

120VAC

|

20A

|

125VDC

|

23.5A

|

16.1 x 13.7 x 3.5”

|

33 lbs

6kVA

|

120VAC

|

40A

|

125VDC

|

40.0A

|

16.1 x 19 x 3.5”

|

33 lbs

Installation

Mounting the LTI2 PRO
Interchangeable mounting brackets are provided for 19” rack mounting. When mounting the LTI2 PRO in any configuration, consider the size and weight of the Inverter. The rack must be able to support the weight of the inverter, as well as an additional safety factor. Refer to Table 1 to verify the weight of the inverter. The location chosen for the inverter should be within an ambient temperature range of -4˚F to 122˚F (-20˚C to 50˚C) with a non-condensing relative humidity no higher than 95%. The inverter should be mounted in an area free of explosive materials and away from any liquids. Avoid using equipment in a location with corrosive gases (e.g. over flooded Lead Acid batteries) and dust. The LTI2PRO utilizes fan-assisted cooling, so clearance of at least 6 inches of free air must be maintained in front and on top for proper cooling. Maintain 12 inches (300 mm) or more of clearance at the rear of the inverter when rack mounting to allow for operation and maintenance. The preferred fastener is a machine bolt backed with a flat washer, lock washer, and nut. All hardware should be corrosion-resistant.

Rack-Mounting the LTI2 PRO
The LTI2 PRO enclosure can be rack mounted on a standard 19/23” relay rack. For rack-mounting install the brackets to the front of the LTI2 PRO enclosure, seen in Figure 2. Flush mount the LTI2 PRO enclosure to the relay rack.

Electrical Connections
Before beginning any work on the inverter, ensure that all incoming and output power is de-energized. Verify that no voltage is present by using a voltmeter at all input and output terminals. Check that the voltage and frequency match the inverter front nameplate specifications. Select wire size using the table below.

Inverter Rating| AWG Minimum Wire Size for DC Connection| AWG Minimum Wire Size for Equipment

Grounding

| AWG Minimum Wire Size for AC Connection
---|---|---|---
LTI2 PRO-1K| #10| #14| #14
LTI2 PRO-3K| #10| #14| #14
LTI2 PRO-6K| #8| #14| #14

Table 2 – Wire Size Minimum Requirements (All wires specified in the table are rated at 90 °C or 194 °F)
NOTE: These are the recommended sizes per La Marche Standards. The National Electrical Code (NEC) and Local Wiring Codes must be followed.

Input Wiring

WARNING: Connecting the battery to the Inverter may cause a spark at the point of connection. There is a RISK OF EXPLOSION in hazardous areas or locations where explosive gases have accumulated. Access the rear of the inverter and locate the DC Input connection terminal. Connect DC wiring to the inverter per figure-3. Refer to Table 2 for the recommended wire size.
WARNING: Connect rated AC input to the Inverter, failure to properly rated input may cause a spark at the point of connection. Access the rear of the inverter and locate the AC Input connection terminal. Connect AC wiring to the inverter per figure – 4. Refer to Table 2 for the recommended wire size. With DC input wiring connected and operating within the DC range, verify inverter starts up by switching the power switch to the front panel. The Inverter INV. ON LED should turn solid green, indicating successful start-up and no faults. Using a digital multimeter, measure the AC output to verify voltage output.
Output Wiring
The LTI2PRO comes with Bulk AC connections at the rear of the inverter. Connect AC cables to the equipment per the figure – 4. Select the recommended AC wire size using Table 2. If the distance between the inverter’s output and the load exceeds 10 feet, use the Power Wiring Guide in Appendix B to minimize the voltage drop across the wire distance.

Alarm Connections
The LTI2 PRO inverter is equipped with a single set of Form ‘C’ dry-type relay contacts (60 VDC @ 0.5A rating) for Alarm.

Input and Output Protection
When installing an LTI2PRO inverter system, it is crucial to select the appropriate AC and DC breakers to ensure proper input and output protection. Tables 3 and 4 below provide guidance and recommendations on selecting the correct AC and DC breaker sizes based on the specific LTI2PRO inverter model being used.

LTI2PRO-3K-125-A6
LTI2PRO-4K-48-A6| 27 A| 40
LTIPRO-4K-125-A6
LTI2PRO-5K-48-A6| 33.3 A| 50
LTIPRO-5K-125-A6
LTI2PRO-6K-125-A6| 40 A| 60

Table 3 – AC Breaker sizes

Table 4 – DC Breaker sizes

Operation

Operation Mode

AC Power Supply Mode

AC inverter working mode: The Inverter employs mains for load when there are mains and switches to the inverter when the mains are abnormal.

DC Power Supply Mode
DC-dominated inverter working mode: Under normal conditions, the DC- dominated inverter is under inverter output status all the time; in case of a DC fault, it switches to mains by-pass.

Start-Up Sequence

Commissioning
Check whether the DC input voltage is consistent with the nameplate label; in case of any inconsistency, please do not apply the DC power supply to an inverter, in order not to cause any damage! Check whether the wiring polarity of the DC input is correct; or else, the inverter cannot be normally started. Check whether the wiring of AC input and output is correct and confirm that there is no short circuit phenomenon. If there is no error in the above checks, respectively apply DC power supply and AC power supply. Turn on the startup switch to power up the inverter. Firstly, all LEDs perform a lamp test for self-inspection. Then, the output relay is closed to output AC power to the load.
Startup
Confirm whether DC input and AC output of the power supply is correctly and reliably connected. After the pressing power switch to rightwards, the inverter performs self-inspection. Before steady output, the inverter power supply checks the external environment and checks whether the inverter supply power itself is normal; if various status parameters of the inverter power supply and the mains are normal, the inverter will steady operate in mains status or inverter status (AC-dominated inverter is steady in mains output status and DC-dominated inverter is steady in inverter output status). It takes about 5 seconds to complete the startup process.
Shutdown
After the pressing power switch to leftwards, the inverter LED indicator light and the inverter power supplies are turned off.
Mute
In the case of the inverter power supply faults, the system will send audible and visual alarm which can be set through LCD, to the mute audible sound of a particular alarm, select Turn Off in the sound control option. The operator can directly press ENT (temporary) button to inactivate and activate an audible alarm. For the same alarm, the muted alarm will not be automatically turned on; if there is another alarm, no matter whether the last alarm is under mute status or not, the system will automatically turn on the audible alarm.

Understanding the Alarms
LED lights, LCD screen, and Buttons

LED and Alarm Indications Details

Mode LED

Status| Indicator Light| Buzzer
AC Mode| Solid Green| No
DC Mode| Solid Blue| No
Mains LED

Status| Indicator Light| Buzzer
Normal AC Voltage| Solid Green| No
High AC Voltage| Quick Flashing Red| One Sound Every 3s
Low AC Voltage| Slow Flashing Red| One Sound Every 3s
No AC Voltage| Solid Red| One Sound Every 3s
Battery LED

Status| Indicator Light| Buzzer
Normal DC Voltage| Solid Green| No
High DC Voltage| Quick Flashing Red| One Sound Every 1s
Low DC Voltage| Slow Flashing Red| One Sound Every 3s
No DC Voltage| Solid Red| One Sound Every 3s
Load LED

Status| Indicator Light| Buzzer
Normal Load| Solid Green| No
Overload 120%| Slow Flashing Green| One Sound Every 1s
Overload 150%| Quick Flashing Green| One Sound Every 1s
Overload Shutdown| Slow Flashing Red| Continuous Sound
Short Circuit Shutdown| Quick Flashing Red| Continuous Sound
Inverter Fault| Solid Red| Continuous Sound

Table 5 – LED and Alarm Indications Details

LCD Menu

Figure 9 – LED and Alarm Indications Details
Figure 10 – LED and Alarm Indications Details
Input Password “001188” to enter into configuration Menu

Troubleshooting

positive terminals and then reconnect the corresponding wire.
Low DC Input voltage| Use a Multimeter to measure the voltages of the DC input to confirm whether the voltage is higher than the startup voltage.| Start the inverter after the battery is charged to the DC input range.

Operating fault

| Low-voltage, high voltage, overload protection.| Cut off the load to test whether the inverter normally operates and the voltage of each point is normal.| Consult with La Marche mfg.
Mains switching fault| Too high or too low utility supply voltage| Use a Multimeter to measure the voltages of the AC input to confirm whether the voltage is within the

working range.

| Switch after the utility supply voltage is stable.
Low-voltage shutdown protection of the inverter| After the low-voltage shutdown of an inverter, connect to the Mains without switching.| Switch after the inverter operates again.
Output fault| Inverter protection| High voltage, low voltage, overtemperature, overload.| Consult with La Marche mfg.
Communication fault| Whether the communication interface is wrongly accessed.| Check whether the correct communication mode (RS232 or 485) is selected.| Select the correct communication mode
Whether the communication line is too long.| Check whether the Baud rates of the communication line material and panel are consistent with each

other.

| Use twisted pair or reset Baud rate.

Table 6 – Troubleshooting Guide

Technical Specifications

Appendix A: Technical Specifications
The La Marche LTI2 PRO Inverter is designed for 1kVA to 6kVA with pure sine wave 120VAC 60Hz power at output from a 48V or 125V DC input source. This inverter is equipped with standard features such as voltage regulation, under/over–voltage conditions, and overload protection with >=85% efficiency.

Parameter| LTI2 PRO 1K-48-A6| LTI2PRO 2K-48- A6| LTI2PRO 3K-48- A6| LTI2PRO 3K-125-A6| LTI2PRO 4K-48- A6| LTI2PRO 4K-125-A6| LTI2PRO 5K-48- A6| LTI2PRO 5K-125-A6| LTI2PRO 6K-125-A6
---|---|---|---|---|---|---|---|---|---
| Capacity (VA)| 1kVA| 2kVA| 3kVA| 4kVA| 5kVA| 6kVA
DC

Input

| Rated Input Voltage (Vdc)| 48V| 48V| 48V| 125V| 48V| 125V| 48V| 125V| 125V
Rated Input Current (A)| 20.8| 41.6| 62.5| 27.2| 83.3| 36.3| 106| 45.45| 54.54
Cut off- DC
Input Range (Vdc)|

40V-60V

|

40V-60V

|

40V-60V

|

90V-155V

|

40V-60V

|

90V-155V

|

40V-60V

|

90V-155V

|

90V-155V

Operating- DC Input
Range (Vdc)|

45.5V-57V

|

45.5V-57V

|

45.5V57V

|

100-150V

|

45.5V-57V

|

100-150V

|

45.5V-57V

|

100-150V

|

100-150V

Reflected Noise Current| <=10%
AC Bypass Input| Bypass Voltage

Range (Vac)

|

85V-135V (+/-10V)

AC Output| Rated Output Capacity (W)|

800

|

1600

|

2400

|

3200

|

4000

|

4800

Output Voltage and Frequency| 120Vac, 60Hz
Output Current (A)| 6.7| 13.3| 20| 27| 33.3| 40
AC Output| Voltage Accuracy (V)| 120±1.5%
---|---|---
Frequency Accuracy (Hz)| 60±0.1%
Waveform| Pure sine wave
Total harmonic distortion (THD)| ≤3% (linear load)
Dynamic response time| 5% (load 0←→100%)
Power factor (PF)| 0.8
Overload capacity| 110%-130% 60s| 131%-150% 10s
Inversion efficiency (80% resistive load)| ****

≥85%

Inverter – Bypass (ms)| ≤8ms
Working Environment| Dielectric Strength (input & output)| 1500Vac, 1 minute
Noise (1m)| ≤55dB
Ambient temperature| -20℃~+50℃
Humidity| 0~90%, No condensation
Altitude (m)| ≤2000
Indication| LCD Status| Input and Output Voltage, Frequency, Output Current
Inverter Status| Normal mains, Normal Inversion, Battery Under-Voltage, and Output Overload
Measurement| Size (D×W×H)| 16.1 x 13.7 x 3.5”| 16.1 x 19 x 3.5”
Protection function| Input under-voltage and overvoltage, output overload and short circuit protection, etc.
PROTECTION

Current Walk- In| The output current will gradually increase after the inverter is turned on, eliminating surges and overshoot
Current Limit| Overload protection
Temperature| Over Temperature Shutdown Protection
ENVIRONMENTAL
Operating Temperature| 32 to 122˚F (0 to 50˚C)
Relative Humidity| 0 to 95% (non-condensing)
Cooling| Fan Assisted
Shock| The inverter in its shipping container withstands shock developed when one edge of the container is dropped six inches while the opposite edge is resting on the ground, or it is dropped two inches without any physical damage or degradation of the electrical performance.
Vibration| The inverter in its shipping contained, withstands vibration encountered in shipping without physical damage or degradation of the electrical performance.
Altitude| The inverter is capable of operation at altitudes up to 2000 meters at an ambient temperature of up to +40 degrees C.
Ventilation| The unit should be mounted so that ventilating openings are not blocked and air entering the cabinet does not exceed 50 degrees C (122 degrees F).

Appendix B: Power Cabling Guide
Use the following formulas and table to determine proper wire size for minimal voltage drop. At distances exceeding 10 feet, the DC wire size should be chosen to keep the voltage difference between the inverter’s DC input terminals and the battery at less than 1/2 volt when the inverter is fully loaded.

Table of Conventions:

• CMA = Cross-section of wire in circular MIL area
• A = Ultimate drain in amperes
• LF = Conductor loop feet
• MaxAmp = Maximum allowable amperes for given voltage drop
• AVD = Allowable voltage drop
• K = 11.1 for commercial (TW) copper wire = 17.4 for aluminum

Calculating Wire Size Requirements:

• CMA= ALFK AVD

Calculating Current Carrying Capacity of Wire:

• MaxAmp = CMAAVD LFK

Size (AWG)| Area CIR.MILS| Size (MCM)| Area CIR.MILS
---|---|---|---
18| 1620| 250| 250000
16| 2580| 300| 300000
14| 4110| 350| 350000
12| 6530| 400| 400000
10| 10380| 500| 500000
8| 16510| 600| 600000
6| 26240| 700| 700000
4| 41740| 750| 750000
3| 52620| 800| 800000
2| 66360| 900| 900000
1| 83690| 1000| 1000000
0| 105600| 1250| 1250000
00| 133100| 1500| 1500000
000| 167800| 1750| 1750000
0000| 211600| 2000| 2000000

Table 7 – Wire Size/Area Table

Appendix C: Document Control and Revision History

• Part Number: 143460
• Instruction Number: P25-LLTI2PRO-1
• Issue ECN: 22666 – 09/20

This manual is subject to change without notice. You may obtain the newest version of the manual at www.lamarchemfg.com.

CONTACT

• 106 Braddock Dr. Des Plaines, IL 60018-1967
• Tel: 847 299 1188
• CPN 143460
• Instruction Drawing Number: P25-LLTI2PRO-1
• Revision A02
• Rev. Date: 08/23
• ECN: 23442

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