Lamarche A39DS User manual

1
La Marche Manufacturing Company
www.lamarchemfg.com!
A39DS
Universal Filtered Battery Charger
Installation and Operation Manual
This manual is subject to change without notice. You may obtain the newest version of the manual at www.lamarchemfg.com
106 Bradrock Dr. Des Plaines 60018-1967
Tel: [phone] Fax: [phone] CPN 148973
Instruction Drawing Number: P25-LA39DS-1
Revision A00 Rev. Date: 10/23 ECN: 23419
Issue Date: 2/12 Rev. A01 ECN: 19412

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Important Safety Instructions
Before using this equipment read all manuals and other documents related to this charger and other equipment
connected to this charger. Always have a copy of a charger’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
chargers and from 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 charger may still
be energized even when the charger has been disconnected from the AC input power. Check with a
meter before proceeding. Do not touch any uninsulated parts.
• A licensed electrician should be used in the installation of any charger.
• Always disconnect the charger from the supply, batteries, and loads before performing maintenance,
replacing parts, or cleaning.
• Always assume that an electrical connection is live and check the connection relative to ground.
• Be sure that neither liquids nor any wet material come in contact with any internal components.
• Do not operate this charger outside the input and output ratings listed on the charger nameplate.
• Do not use this charger for any purpose not described in the operation manual.
Mechanical Safety
• This charger or parts of the charger 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 equipment if it has received a sharp blow, been dropped, or otherwise damaged in any way.
• Do not disassemble this charger. 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 risk of arc, connect and disconnect the battery only when the charger is off.
• If it is necessary to remove 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 enclosure 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 or place any materials on a battery. A spark or short-circuit could cause an explosion.

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Charger Location
• Allow at least 6 inches of free air on all vented surfaces for proper cooling
• Allow sufficient clearance to open the front panel for servicing.
• Do not operate this charger in a closed-in area or restrict ventilation in any way.
• Do not place charger below battery.
• Never allow battery electrolyte to drip on this charger when reading the specific gravity or filling the battery.
• Never place this charger 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
Prior to unpacking the product, note any damage to the shipping container and take pictures. Unpack the product
and inspect the exterior and interior of 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 charger 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
 Enclosure exterior and interior is not marred or dented.
 There are no visibly damaged components.
 All internal components are secure.
 Printed circuit boards are firmly seated.
 All hardware and connections are tight.
 All wire terminations are secure.
 All items on 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 accidently
tipped over or dropped.

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Electrical Safety ........................................................................................................................................ i
Mechanical Safety ..................................................................................................................................... i
Battery Safety ........................................................................................................................................... i
Charger Location ..................................................................................................................................... ii
Check for Damages .................................................................................................................................. ii
Returns for Service .................................................................................................................................. ii
Inspection Checklist ................................................................................................................................. ii
Handling ................................................................................................................................................. ii
Table of Contents ............................................................................................................................... iii
Model Scope/General Description ...................................................................................................... 1
Understanding the Model Number ............................................................................................................. 1
Optional Accessories Included in the Charger ............................................................................................. 1
Quick Start Guide ................................................................................................................................ 2
1 Equipment Handling ..................................................................................................................... 3
1.1 Storing the A39DS ........................................................................................................................ 3
1.2 Moving the A39DS ........................................................................................................................ 3
2 Installation ................................................................................................................................... 4
2.1 Mounting the A39DS ..................................................................................................................... 4
2.1.1 Wall-Mounting the A39DS (#6 Enclosure Only) ........................................................................... 5
2.1.2 Floor-Mounting the A39DS (All Enclosures) ................................................................................. 6
2.2 AC Input Connections ................................................................................................................... 6
2.3 DC Output Connections ................................................................................................................. 8
2.4 Alarms ......................................................................................................................................... 9
2.4.1 Understanding the Alarms & Statuses ......................................................................................... 9
2.5 Additional Option Connections ....................................................................................................... 9
3 Operation ................................................................................................................................... 10
3.1 Starting the A39DS ..................................................................................................................... 10
3.1.1 Checking the Installation ......................................................................................................... 10
3.1.2 Start-Up Sequence .................................................................................................................. 10
3.1.3 Setting the DC Voltage, DC Current Limit & Elapsed Time .......................................................... 10
3.1.4 Stopping the Charge ............................................................................................................... 10
3.1.5 Resetting the Charger ............................................................................................................. 10
3.2 Digital Control Board ................................................................................................................... 11
3.3 Output Voltage Adjustments ........................................................................................................ 12
4 Controller Menus ........................................................................................................................ 12
Saving Settings ...................................................................................................................................... 12
4.1 Settings Menu ............................................................................................................................ 12
4.1.1 Output Settings ...................................................................................................................... 13
Table of Contents

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DC Voltage Setting ......................................................................................................................... 13
DC Current Limit Setting ................................................................................................................. 13
Elapsed Time ................................................................................................................................. 13
4.1.2 Alarm Settings ........................................................................................................................ 13
4.1.3 Advanced Settings .................................................................................................................. 14
Shutoff Enable ............................................................................................................................... 14
AC Volts Scale ................................................................................................................................ 14
Security ......................................................................................................................................... 14
Firmware Menu .............................................................................................................................. 14
Firmware Version ............................................................................................................................... 14
Update Firmware ................................................................................................................................ 14
LCD Settings .................................................................................................................................. 15
Serial Number ................................................................................................................................ 15
Set Clock ....................................................................................................................................... 15
Set to Default ................................................................................................................................ 15
4.1.4 Basic Defaults .................................................................................................................. 16
4.2 Test LEDs ............................................................................................................................... 16
4.3 Reset Alarms .............................................................................................................................. 16
4.4 Last 10 Events ............................................................................................................................ 16
4.5 Manual Start – Zero Volt Battery Start .......................................................................................... 16
5 Service ........................................................................................................................................ 17
5.1 Performing Routine Maintenance ................................................................................................. 17
5.2 Troubleshooting Procedure .......................................................................................................... 18
5.3 Troubleshooting Chart ................................................................................................................ 19
Ordering Replacement Parts ................................................................................................................... 19
- Option Instructions ........................................................................ Error! Bookmark not defined.
- Schematic Diagram ........................................................................ Error! Bookmark not defined.
- Dimensional Drawing ..................................................................... Error! Bookmark not defined.
- Bill of Material Listing ..................................................................... Error! Bookmark not defined.
- Recommended Spare Parts List ....................................................... Error! Bookmark not defined.
- Product Datasheet ......................................................................... Error! Bookmark not defined.

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The La Marche model A39DS “Universal Charger” is a microprocessor-controlled SCR battery charger which has
adjustable output voltage, adjustable output current limit, and an adjustable charge timer.
The output voltage, output current, the elapsed time, and alarms are displayed on the LCD display. The DC
voltage has a wide range adjustment after battery detection. The DC current limit adjusts from 5% to 100% of
the rated output. This provides the flexibility to charge a wide range of different types of batteries. The charge
timer range adjusts between 1 hour to 99 hours in 1-hour increments.
“Enter / Quick Set” button allows adjusting the output DC voltage, output DC current limit & the elapsed time.
Quick set is active while charging only.
The initial voltage setting is derived from the actual battery voltage when the battery is connected. The current
limit automatically defaults to 10% of the rated output and the charger timer defaults to 8 hours on start-up.
The A39DS will “Auto” start upon connection of the battery and “Auto” stop when the charge cycle is terminated
or a normal charge is complete.
Understanding the Model Number
The A39DS model number is coded to describe the options that are included. Find the model number on the
nomenclature nameplate of the charger. Then follow the chart to determine the configuration of your battery
charger.
Optional Accessories Included in the Charger
This charger 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 charger is no longer available, contact La Marche and provide the model or serial number of the
charger to receive a list of the included accessories.
Model Scope/General Description

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La Marche A39DS Battery Charger: Getting Started
WARNING: Please read the Important Safety Instructions before proceeding. Make sure to check
for any shipping damages before getting started.
1 – Connect Proper AC Voltage
Confirm & connect proper AC voltage against charger nameplate. If charger is multi-tap, refer to AC Input
Voltage Tap Configuration table inside the charger or on charger schematic. Close AC breaker.
2 – Adjust Charger DC Output & Alarms
To access the Settings Menu, press the MENU button, select “Settings Menu”, and press the ENTER button.
Once in the Settings Menu, the user can navigate the submenus with the up and down arrows. To enter a
submenu, use the ENTER button. The BACK button returns to the previous menu. When making a selection, the
ENTER button will store the value and step back. The BACK button will not save the change and will go a step
back. At any point, the settings menu can be exited, with or without saving the settings.
Output Settings
• DC Voltage
• DC Current Limit
• Elapsed Time
Alarm Settings
• Low DC Current
Advanced Settings
• Shutoff Enable
o Low Current Turn Off
• AC Volts Scale
• Security
o Password Enable
• Firmware Menu
o Firmware Version
o Bootloader Version
o Update Firmware
• LCD Settings
o LCD Backlight
• Serial Number
• Set Clock
o Set Date and Time
• Set to Default
Basic Defaults
• Reset to default Settings
3 – Connect Batteries
Observe proper polarity when making battery connections. Close the DC breaker, if applicable.
A39DS
Quick Start Guide

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1.1 Storing the A39DS
If the A39DS 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 185° F (-40 to 85°
C) with a non-condensing relative humidity of 0 to 95%.
NOTE: Storage should not exceed 2 years due to the limited shelf life of the DC filter capacitors when they are
not in service.
1.2 Moving the A39DS
After careful inspection and upon verification that the A39DS is undamaged, identify the enclosure style and
weight of the A39DS charger. Refer to the tables below.
Output
Voltage
Frequency
Ampere Rating
20 ADC
30 ADC
40 ADC
60 ADC
30 VDC
60 Hz
6 Case
175 lbs.
(79.4 kg)
60 VDC
6 Case
130 lbs.
(59 kg)
6 Case
190 lbs.
(86.2 kg)
90 VDC
6 Case
300 lbs.
(136.1 kg)
150 VDC
6 Case
300 lbs.
(136.1 kg)
Table 1 – Case Type and Weight (Single Phase, 20-60 ADC)
Output
Voltage
Frequency
Ampere Rating
50 ADC
100 ADC
150 ADC
200 ADC
60 VDC
60 Hz
8A Case
325 lbs.
(147.4 kg)
8A Case
350 lbs.
(158.8 kg)
72 Case
450 lbs.
(204.1 kg)
90 VDC
8A Case
350 lbs.
(158.8 kg)
8A Case
565 lbs.
(256.3 kg)
72 Case
637 lbs.
(288.9 kg)
150 VDC
8A Case
345 lbs.
(156.5 kg)
8A Case
600 lbs.
(272.2 kg)
27 Case
640 lbs.
(290.3 kg)
27 Case
690 lbs.
(313 kg)
Table 2 – Case Type and Weight (Three Phase, 50-200 ADC)
1 Equipment Handling

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2.1 Mounting the A39DS
When mounting the A39DS in any configuration, consider the size and weight of the charger. The wall, and/or
floor must be able to support the weight of the charger as well as an additional safety factor. Verify the method
of mounting and the weight of the A39DS, using Tables 1, 2, and 3. The following considerations should be taken:
• The location chosen for the charger should be within an ambient temperature range of 32 to 122˚F (0 to
50˚C) with a non-condensing relative humidity no higher than 95%.
• The A39DS should be mounted in an area free of explosive materials and away from drips and splatter.
• The A39DS utilizes convection cooling, so a clearance of at least 6in (152mm) of free air must be
maintained on the top, bottom, and both sides for cooling air.
• Maintain 36in (914mm) or more of clearance at the front of the charger to allow for operation and
maintenance.
• The bolts or screws used to secure the charger should be sufficient length to assure a vibration-free
mounting.
• The preferred fastener is a machine bolt backed with a flat washer, lock washer, and nut. All hardware
should be corrosion resistant.
NOTE: Please refer to the specific enclosure drawing provided with unit manual for greater detail.
Enclosure
Number
Cable Entry
Mounting
AC Input
DC Output
6
Right/Top
Bottom
Left/Top
Bottom
Wall / Floor
8A
Right/Top
Bottom/Side
Left/Top
Bottom/Side
Floor
27
Top
Top
Floor
72
Right/Bottom
Bottom
Floor
Table 3 – Available Mounting Methods
2 Installation

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2.1.1 Wall-Mounting the A39DS (#6 Enclosure Only)
Wall-Mount Procedure
To wall-mount the A39DS, install five 5/16 in (8 mm) bolts on the wall rated to support the charger weight plus
a safety factor of at least two times. Secure the charger on bolts, add appropriate mounting hardware, and tighten
securely. Refer to the figures below for mounting dimensions and specifications.
NOTE: All below dimensions are in inches. For further A39DS enclosure information, see the outline drawings for
the corresponding enclosures online at http://www.lamarchemfg.com/info/enclosure-drawings.html
Figure 1 - #6 Enclosure Wall mounting Bolt Pattern

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2.1.2 Floor-Mounting the A39DS (All Enclosures)
Floor-mounting the 8A, 27 & 70 enclosures is standard. If it is desired to floor mount a charger with the 6
enclosure, the floor-mount bracket is provided.
Floor-Mounting Procedure
To floor-mount the A39DS, install four to six bolts into the floor. Place the charger on the bolts, add appropriate
mounting hardware onto the floor-mounting anchor bolts, and tighten securely. Refer to Figure 2 for hardware
specifications and floor-mounting dimensions.
Case Size
A
B
C
Hole Dia.
Bolt Size
6
23.5”
(597mm)
8.875”
(225mm)
0.328”
(8.33mm)
5/16”
(8mm)
8A
25.5”
(648mm)
10.875”
(276mm)
0.406”
(10.31mm)
3/8”
(10mm)
72
25.75”
(654mm)
17.5”
(445mm)
0.313”
(7.95mm)
5/16”
(8mm)
27
29.25”
(743mm)
20”
(508mm)
10”
(254mm)
0.406”
(10.31mm)
3/8”
(10mm)
Figure 2 – A39DS Enclosure Footprint

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2.2 AC Input Connections
Before beginning any work inside the charger, ensure the following:
• Verify all incoming AC supply is de-energized.
• Verify that no voltage is present inside the case by using a voltmeter at all input and output terminals.
• Check that the source voltage and frequency match the charger front nameplate specifications.
• Confirm if charger is multi or single input by referring to charger nameplate.
• If charger is confirmed to be a multi-input charger, refer to corresponding charger schematic or AC input
wiring chart inside charger for transformer tap settings.
Select wire size using the table below. This is based on an overload current of 110-115% of the input current
listed on the charger nameplate.
NOTE: Feeder breaker should be sized to match the size of the AC protection used in charger. If multi-tap charger
is set for 120VAC input configuration, feeder breaker should be double the size of the AC protection. 120VAC
configured multi-tap chargers use both breaker poles in parallel.
Breaker Size/
Fuse Size - Amps
AWG Minimum Wire Size Requirement
for Customer Connection
AWG Minimum Wire Size
for Equipment Grounding
3
#14
#14
5
#14
#14
10
#14
#14
15
#14
#14
20
#12
#12
25
#10
#12
30
#10
#10
40
#8
#10
50
#8
#10
60
#6
#10
70
#6
#8
80
#4
#8
90
#4
#8
100
#4
#8
125
#2
#6
150
#1
#6
175
#1/0
#6
200
#2/0
#6
250
#4/0
#4
300
250 MCM
#4
400
400 MCM
#2
500
600 MCM
#2
Table 4 – AC/DC & Ground Wire Size Minimum Requirements
(All wires specified in the table are rated at 90 °C or 194 °F)
NOTE: These are recommended sizes per La Marche Standards. The National Electrical Code (NEC) and Local
Wiring Codes must be followed.
AC Connection Procedure
First, connect an adequate earth ground lead (use table above for sizing) to the terminal marked ground. Install
the input AC cables to the AC input terminals of the charger. Refer to the schematic diagram for AC input
connections.

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2.3 DC Output Connections
Before making any of DC output connections, make sure you have read and fully understand the DC Connection
Procedure below. Select proper size for the DC wiring from the wire size table on the previous page. If the distance
between the charger’s DC output and the DC load exceeds 10 feet, use the Power Cable Guide below to minimize
the voltage drop across the wire distance.
NOTE: It is recommended to use a battery disconnect breaker between charger and battery bank; helpful during
battery or charger maintenance.
Power Cabling Guide
Use the following formulas and table to determine proper wire size for minimal voltage drop.
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 (KS5482-01)
= 17.4 for aluminum (KS20189)
Calculating Wire Size Requirements
Calculating Current Carrying Capacity of Wire
Table 5 – Wire Size/Area Table
NOTE: These are recommended sizes per La Marche Standards. The National Electrical Code (NEC) and Local
Wiring Codes must be followed.
DC Connection Procedure
To prevent the DC circuit breaker from tripping when connecting the battery, connections should be done in the
following order.
1. Make sure that the incoming voltage to the charger is turned off.
2. Turn off/open the charger’s AC and DC circuit breakers.
3. Connect the battery cables to the charger’s DC output terminals. OBSERVE PROPER POLARITY.
4. Energize the charger by supplying AC voltage and turning on/closing the charger’s AC breaker. This will charge
the capacitors inside the charger.
5. After 30 seconds, turn on/close the DC breaker.
AVD
KLFA
CMA ´´ =
KLF
AVDCMA
MaxAmp ´
´
=
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

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2.4 Alarms
As a standard feature of the A39DS, there are multiple alarms available that will be displayed on the LCD during
an event. A “Failure” LED is illuminated if any the following alarms occur:
• AC Failure
• Low AC Input Voltage
• High AC Input Voltage
• High DC Voltage
• Low DC Current
2.4.1 Understanding the Alarms & Statuses
AC FAIL ALARM will trigger, and the red “FAILURE” LED will turn on if the AC power to the charger is lost for
longer than 20 seconds. The alarm will automatically reset when AC power is restored to the charger. When AC
power is lost, the front panel display and indicators will remain powered by the connected batteries.
LOW ACV ALARM will trigger, and the red “FAILURE” LED will turn on if the AC input falls 12% below the
nominal input for longer than 20 seconds. The alarm will automatically reset when AC input returns to normal
state. When AC power is lost, the front panel display and indicators will remain powered by the connected
batteries.
HIGH ACV ALARM will trigger, and the red “FAILURE” LED will turn on if the AC input rises 12% above the
nominal input for longer than 20 seconds. The alarm will automatically reset when AC input returns to normal
state.
HIGH DC VOLTAGE ALARM will trigger, and the red “FAILURE” LED will turn on if the DC voltage rises above
the charger’s maximum output voltage setting for longer than 5 seconds. See below:
• The 30V model has a maximum output voltage setting of 30V.
• The 60V model has a maximum output voltage setting of 60V.
• The 90V model has a maximum output voltage setting of 90V.
• The 150V model has a maximum output voltage setting of 150V.
NOTE: All alarms automatically reset when the alarm condition is corrected.
LOW DC CURRENT ALARM will trigger and the red “FAILURE” LED will turn on if the output DC current of the
charger falls below the alarm threshold for longer than 5 seconds. This can be caused by the battery being
disconnected or if the battery has reached a full charge. This could also be the result of mis-adjustments of the
output voltage settings. This alarm can be disabled if considered a nuisance alarm.
CURRENT LIMIT will trigger and the amber “CURRENT LIMIT” LED will turn on when the charger is in current
limit, i.e. charging the battery at the current limit set point.
80% will trigger and the green “80% / COMPLETE” LED will flash when the charger is in constant voltage
mode, i.e. charging the battery at the output voltage set point.
COMPLETE will trigger and the green “80% / COMPLETE” LED will turn on solid when the charger has finished
charging the battery. Charger output will automatically shut off.
CHARGING will trigger and the green “CHARGING” LED will turn on solid when the charger is charging the
battery. Charger output will be present.
2.5 Additional Option Connections
The A39DS charger may have been outfitted with several optional accessories or option packages. To determine
the options included (if any) and the suggested connections, refer to the cover page of the manual package and
the option instructions included with the A39DS charger instruction manual.

10
3.1 Starting the A39DS
All equipment is shipped from the factory fully checked and adjusted based on the model number.
3.1.1 Checking the Installation
Before attempting to start up the A39DS, check and verify the following:
• Verify all connections are correct.
• Check that all terminations and contacts are tightened securely
• Check for any loose connection or unsecured components in the charger
• Check that the transformer is set for the correct input voltage and that the input frequency matches the
nameplate or the charger
• Check that the battery voltage does not exceed the DC output voltage on the nameplate of the charger
• Verify AC feeder breaker matches charger input protection rating.
3.1.2 Start-Up Sequence
• Close the AC breaker. The charger LEDs should flash and firmware version should show on the display
for approximately 3 seconds. Then “Checking for Battery…” will be displayed on the LCD.
• Close the DC breaker to connect the battery.
• The charger will check the battery voltage & adjust the output 10% above the reading. The current limit
will be set to 10% as the default.
• The charger will slowly ramp-up to the target voltage (this can take up to 10 seconds). “Charging” LED
will be lit.
3.1.3 Setting the DC Voltage, DC Current Limit & Elapsed Time
• While charging, “Quick Set” feature is active.
• Press the “Enter / Quick Set” button.
Quick Set feature will be
shown on the LCD display.
• The first setting is the DC Voltage. Use the Up
& Down arrows to adjust the output DC
Voltage to the desired setting.
• Press “Enter / Quick Set” button to confirm the
setting & advance to the next parameter.
• The second setting is DC Current Limit. Use
the Up & Down arrows to adjust the output DC
Current Limit to the desired setting.
• Press “Enter / Quick Set” button to confirm the
setting & advance to the next parameter.
• The last setting is Elapsed Time: use the Up &
Down arrows to adjust the charging time to
the desired setting.
• Press “Enter / Quick Set” button to exit.
NOTE: To cancel the adjustment, use the “Back / Left Arrow” button.
3.1.4 Stopping the Charge
• To terminate the charge, press the “STOP” button.
3.1.5 Resetting the Charger
• After the charge is complete or terminated, to reset the charger, press & hold the “STOP” button for 3
seconds.
3 Operation

11
3.2 Digital Control Board
The standard A39DS comes with an LCD digital control board. The digital control board is a more attractive and
user-friendly option, with many additional features.
Figure 3 – A39DS Front Panel
The parameters viewable on the idle display are as follows:
Standard A39DS Display Sequence
System DC Outputs
Elapsed Time
Logging Status
Timer Setting
Charger Clock – Date and Time
Amp-Hour Returned
Voltage 132.3 V
Current 15.2 A
Elapsed Time
01:07:34
Logging Status
OK 0.01 Pct
Timer set to
08 Hours
07/29/2023
11:27:39
A-H Returned
248.6

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3.3 Output Voltage Adjustments
The output voltage of the A39DS charger is set to a default value of 10% above the battery voltage. But should
be adjusted to meet the battery manufacturer recommendations. To adjust the DC output voltage, refer to Section
4.1.1.
NOTES:
1. When making output voltage adjustments with batteries connected, the immediate change will be reflected
on the output current and NOT the voltage due to the voltage difference between the output and the
batteries.
2. Immediate change in voltage might not be seen due to the back-feed of the battery voltage when performing
adjustments.
The A39DS is equipped with multiple settings and test menus. Refer to Appendix A for details on the structure of
the charger menus. Access menus by pressing the MENU button on the front panel. Navigate using the BACK, UP,
DOWN and ENTER button. To enter a submenu, use the ENTER button. Quick set is also available using the
ENTER button while charging the battery.
Saving Settings
At any point, the user can press the BACK button from the main Settings Menu to exit the Settings Menu. When
the back button is pressed (on the main Settings Menu), the user is prompted if they would like to “Exit and Save
Settings?”
If the BACK button is pressed again, the control board will return to the Settings Menu. If “YES” is selected, the
display will read “Saving Settings”, the menu will be exited, and settings saved. If “NO” is selected, the user is
prompted to “Exit without Saving?”
From this screen, if “YES” is selected, the user will be returned to the DC output display and all changes to the
settings will not be saved. If “NO” is selected, the user will be returned to the Settings Menu.
à
4.1 Settings Menu
All equipment is shipped from the factory fully checked and adjusted based on the model number. Do not make
any adjustments unless the equipment has been powered up and the settings have been determined to be
incorrect. If the settings have been determined to be incorrect, adjustments may be made as detailed below.
Once in the Settings Menu, the user can navigate the menus with the up and down arrows. To enter a submenu,
use the ENTER button. The BACK button returns to the previous menu. When making a selection, the ENTER
button will store the value and step back. The BACK button will not save the change and will go a step back. At
any point, the settings menu can be exited, with or without saving the settings.
The settings menu is divided into 4 submenus:
• Output settings
• Alarm Settings
• Advanced Settings
• Basic Defaults
NOTE: Some chargers may have additional settings included in the Settings menu; contact La Marche for further
explanation of settings not mentioned below.
The Settings menu is as follows:
4 Controller Menus
< Exit and Save
Settings? NO
< Exit without
Saving? YES

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4.1.1 Output Settings
The Output Settings submenu provides access to change the DC Voltage, DC Current Limit as well as the Elapsed
Time.
DC Voltage Setting
The DC voltage is automatically set once the battery voltage is detected. The DC voltage increments by 0.1V.
Select “DC Voltage” and then press ENTER button. Press the UP and/or DOWN buttons until the desired voltage
level is displayed. Press ENTER to store the setting or BACK to cancel.
à
DC Current Limit Setting
The DC current limit automatically defaults to 10% of the rated output. The DC current limit increments by 1%.
Select “DC Current Limit” and then press ENTER button. Press the UP and/or DOWN buttons until the desired
current limit level is displayed. Press ENTER to store the setting or BACK to cancel.
à
Elapsed Time
The Elapsed Time defaults to 8 hours on start-up. The charging time increments by 1 hour. Select “Elapsed Time”
and press then ENTER button. Press the UP and/or DOWN buttons until the required charging time is displayed.
Press ENTER to store the setting or BACK to cancel.
à
4.1.2 Alarm Settings
The Alarm Settings submenu provides access to the change the Alarm Thresholds. The Alarm Thresholds setting
allows the user to determine the current or voltage value at which an alarm trigger. The threshold can be changed
for the following:
• Low DC Current
à
NOTE: Alarm threshold defaults are based on the charger rating. The alarm threshold values shown above are
not representative of the default values for any specific A39DS charger.
>DC Voltage
DC Current Lim.
DC Voltage
130.2 V
>DC Current Lim.
Elapsed Time
DC Current
10 Percent
>Elapsed Time
DC Voltage
Elapsed Time
8 Hours
>Alarm Settings
Low DC Current
Alarm 0.5 A

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4.1.3 Advanced Settings
The Advanced Settings Menu allows the user to access and modify other parameters of the charger which are not
included in the basic Settings Menu. The Advanced Settings Menu is divided into 7 submenus:
• Shutoff Enable
• AC Volts Scale
• Security
• Firmware Menu
• LCD Settings
• Serial Number
• Set Clock
• Set to Default
Shutoff Enable
The Shutoff Enable Settings submenu provides access to enable or disable the charger shutoff when Low DC
Current alarm occurs. If enabled, during Low DC Current alarm, the charger will terminate the battery charge. If
disabled, the charger will not terminate the battery charge during Low DC Current alarm. The charger will continue
charging the battery until the elapsed time is reached.
AC Volts Scale
The “AC Volts Scale” option is included for chargers that have multiple taps. This setting adjusts the scaling
used to measure the charger’s AC voltage. If the charger has a single input voltage, do not adjust this setting as
it affects the AC Low & AC High alarms.
Security
The “Security” menu allows the user to set a password to enter calibration. By default, the password is disabled.
To enable the menu password, enter the Settings Menu by pressing the Menu button on the front panel.
Navigate to Advanced → Security → Password Enable. Select YES and enter “0000”. Navigate to “Set
Password”. Set password to desired four-digit pin. Make sure to save this new number as it will be necessary to
access the menu after enabling the security feature. If the security feature is decided to be disabled at a later
time, reset password to “0000” following the same steps previously mentioned.
NOTE: If a password is set, no changes can be made within this menu without knowing the password. In case
the password is forgotten or lost, consult factory for password reset.
Firmware Menu
The Firmware Menu allows the user to view the firmware version, as well as update the firmware if desired. The
submenus are as follows:
Firmware Version
The menu allows the user to view the current firmware version of the charger.
Update Firmware
The A39DS firmware can be updated, as a standard feature, via a microSD card. To update the firmware, follow
the procedure below:
NOTE: If more than one firmware .bin file is on the microSD card, the bootloader will not program or
reprogram the flash and will show a message saying “More than 1 file found!” and will loop forever.
If no firmware .bin file is on the microSD card and the program flash is empty, the bootloader will loop forever
and display the message “No update file found!”
1. Insert the microSD card into the computer using a microSD card converter.
2. Back up all files on the microSD card to the computer.
3. Format the microSD card.

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4. Find the firmware .bin file provided and upload it into the microSD card.
5. Safely remove the microSD card from the computer and insert it on the A39DS charger’s microSD card
slot.
6. Update the firmware by entering the Settings menu:
Menu à Advanced à Firmware Menu à Update Firmware
7. Enter the password provided (must contact La Marche Service Department) and select YES when
prompted to update the firmware. The charger will start to program itself. Do not interrupt the power or
the board while it is programming!
LCD Settings
The “LCD Settings” option allows the user to control the LCD backlight. By default, the LCD backlight
automatically turns off after two minutes. The user may also set it to be always on.
à
Serial Number
The “Serial Number” setting allows the user to change the serial number associated with the S2A-368S board.
This serial number is the serial number of the A39DS charger and is set at the factory for new chargers. If a
user receives a replacement S2A-368S board, the serial number will have to be set via calibration.
In order to change the serial number used by the software, select “Serial Number” from the Settings menu and
press the ENTER button. Each digit of the serial number is adjusted individually. Press the LEFT and RIGHT
buttons to select digits. If the leftmost digit is selected, pressing left will exit the serial number setting and
discard changes. Press the UP and DOWN buttons to increase and decrease the selected digit.
à
Set Clock
The “Set Clock” setting allows the user to program the real-time clock used by the software. This clock is used
in the data logging to timestamp events. In addition, the clock can be reset which returns the clock to the date
setting of software revision.
Set to Default
The “Set to Default” option resets all user-adjustable settings to the factory defaults. It is important to note that
the factory defaults are not necessarily the correct settings for the specific DC system. Before the charger is
shipped, adjustments are made at the factory using the same calibration procedure. If the charger is reset to
default, these factory changes may be reset.
>LCD Settings
LCD Backlight
AUTO OFF 2 Min
>Serial Number
Enter Serial #
123456-01