Lamarche MSM 10-12V User manual

i
La Marche Manufacturing Company | www.lamarchemfg.com
MSM V.3
Marine High Frequency Battery Charger
Installation and Operation Manual
106 Bradrock Dr. Des Plaines 60018-1967
Tel: [phone] Fax: [phone] CPN 136069
Instruction Drawing Number: P25-LMSM-3
Revision A02 Rev. Date: 06/17 ECN: 21478
Issue Date: 2/12 Rev. A01 ECN: 19412

ii
Important Safety Instructions
Before using this equipment read all manuals and other documents related to this unit and other equipment
connected to this unit. Always have a copy of a units manual on file nearby, in a safe place; if a replacement
copy of a manual is needed it can be found at the www.lamarchemfg.com.
Electrical Safety
WARNING: Hazardous Voltages are present at the input of power systems. The output from rectifiers
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 unit may still be
energized even when the unit 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 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 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 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 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.

iii
Charger 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
Prior to unpacking the product, note any damage to the shipping container. Unpack the product and inspect the
exterior of product for damage. If any damage is observed, contact the carrier immediately. Continue the
inspection for any internal damage. In the unlikely event of internal damage, please inform the carrier and contact
La Marche for advice on the risk due to any damage before installing the product. Verify that you have all the
necessary parts per your order for proper assembly.
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 and/or top heavy. Use adequate manpower or equipment for handling. Until the
equipment is securely mounted, care must be used to prevent the equipment from being accidentally tipped over.

iv
Table of Contents
Important Safety Instructions........................................................................................................................ i
Table of Contents ........................................................................................................................................iv
MSM General Description.............................................................................................................................. 1
Understanding the Model Number................................................................................................................. 1
Optional Accessories Included in the Unit ...................................................................................................... 1
1 Equipment Handling............................................................................................................................. 2
1.1 Storing the MSM ........................................................................................................................... 2
1.2 Moving the MSM ........................................................................................................................... 2
2 Installation.......................................................................................................................................... 3
2.1 Mounting...................................................................................................................................... 3
2.2 Electrical Connections.................................................................................................................... 4
2.2.1 Input Connections ..................................................................................................................... 4
2.2.2 Output Connections................................................................................................................... 5
2.3 Charger Fail Alarm Connections...................................................................................................... 6
2.4 Temperature Compensation........................................................................................................... 6
2.4.1 External Probe Connection Procedure ............................................................................................... 6
3 Operation............................................................................................................................................ 7
3.1 Initial Setup.................................................................................................................................. 7
3.2 Front Display and Indicators .......................................................................................................... 7
3.2.1 Controls.................................................................................................................................... 7
3.2.2 LED Indicators/Alarms ............................................................................................................... 8
3.3 Configure Mode ............................................................................................................................ 9
3.3.1 Setting Output Mode ................................................................................................................10
3.3.2 Setting Battery Type.................................................................................................................10
3.3.3 Setting Float Voltage ................................................................................................................10
3.3.4 Setting Equalize Voltage............................................................................................................10
3.3.5 Setting Equalize Timer ..............................................................................................................11
3.3.6 Setting Equalize Cycle...............................................................................................................11
3.3.7 Setting Current Limit.................................................................................................................11
3.3.8 AC Mains Voltage .....................................................................................................................11
3.3.9 Thermal Derating .....................................................................................................................11
3.3.7 Temperature Compensation ......................................................................................................12
3.3.8 Low Current Alarm ...................................................................................................................12
3.3.9 Cranking Off.............................................................................................................................12
3.3.10 Default Setting.........................................................................................................................12
4 Service...............................................................................................................................................13
4.1 Performing Routine Maintenance...................................................................................................13
4.2 Troubleshooting Procedure ...........................................................................................................13
Appendix A: MSM Specifications...................................................................................................................14
Appendix B: MSM Current draw, Heat loss, and Case size..............................................................................15
Appendix C: Power Cabling Guide ................................................................................................................16
Appendix D: Manufacturer’s Warranty..........................................................................................................17
Appendix E: Document Control and Revision History .....................................................................................18

1
MSM General Description
The La Marche model MSM series uses proven High Frequency charging technology that is developed specifically
for Marine applications. The MSM unit incorporates power factor correction to achieve high efficiency and wide
AC input range. This filtered unit is designed and built to charge VRLA, Flooded Lead Acid and Nickel Cadmium
batteries. To increase the longevity of the batteries and the charger, thermal protection and external temperature
compensation is standard on the MSM. Integrated battery charge divider/isolator provides connections for
charging up to three independent battery banks simultaneously. The unit is built in a robust, non-corrosive
aluminum enclosure that in conjunction with the drip shield and conformal coated boards makes it a perfect
solution for Marine applications.
Understanding the Model Number
The MSM model number is coded to describe the charger and 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 Unit
This unit may have been outfitted with a number of optional accessories or option packages. To find out what
options this unit has (if any) refer to the very first page of the manual package.

2
1 Equipment Handling
1.1 Storing the MSM
If the MSM 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%. 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 MSM
After careful inspection and upon verification that the MSM is undamaged, identify the enclosure style and weight
of the MSM unit. Refer to the table below.
Output
Voltage
Ampere
Rating
AC Input
Voltage
AC Input
Draw
(100%
load)
Case
Dimensions
(W x D x H)
Weight
12 VDC
10 ADC
120
1.5
201
9.6" X 4.6" X 12.2"
5
240
0.8
20 ADC
120
3.1
201
9.6" X 4.6" X 12.2"
5
240
1.6
30 ADC
120
4.6
203
9.6" X 4.6" X 18.3"
14
240
2.4
40 ADC
120
6
203
9.6" X 4.6" X 18.3"
14
240
3.2
60 ADC
120
9.2
205
9.6" X 8.4" X 18.3"
27.7
240
4.8
80 ADC
120
12
205
9.6" X 8.4" X 18.3"
27.7
240
6.4
24 VDC
10 ADC
120
2.6
201
9.6" X 4.6" X 12.2"
5
240
1.4
20 ADC
120
5.2
203
9.6" X 4.6" X 18.3"
14
240
2.7
25 ADC
120
6.5
203
9.6" X 4.6" X 18.3"
14
240
3.1
30 ADC
120
7.8
203
9.6" X 4.6" X 18.3"
14
240
3.8
35 ADC
120
9.1
203
9.6" X 4.6" X 18.3"
14
240
4.4
50 ADC
120
13
205
9.6" X 8.4" X 18.3"
27.7
240
6.3
65 ADC
120
16.9
205
9.6" X 8.4" X 18.3"
27.7
240
8.2
Table 1 – MSM Weights and Dimensions

3
2 Installation
2.1 Mounting
The MSM can be wall mounted using four #10 bolts. Install the MSM using appropriate hardware on the wall.
Figure 1 - MSM Mounting Dimensions for Small Case #201
Figure 2 – MSM Mounting Dimensions for Medium Case #203

4
Figure 3 - MSM Mounting Dimensions for Large Case #205
2.2 Electrical Connections
Before beginning any work, ensure that all incoming AC supply and DC load wires are de-energized. Verify that
no voltage is present by using a voltmeter at all input and output terminals. The MSM is equipped with screw-
type terminals for the output connections. See Figure 3 and 4.
2.2.1 Input Connections
Check that the source voltage and frequency match the charger nameplate specifications. Select wire size using
Table 2. Before connecting the Battery and/or DC loads, it is recommended to apply AC power and set the
configuration for the correct output, see section 3.3 for the configuration instructions. Once the configuration is
set, remove AC power to the charger.
UNIT
OUTPUT
RATING
AC WIRE SIZE
MINIMUM FOR
CUSTOMER
CONNECTION
DC WIRE SIZE
MINIMUM FOR
CUSTOMER
CONNECTION
EQUIPMENT
GROUNDING
CONDUCTOR
MINIMUM
10A-12V
#14
#14
#14
20A-12V
#14
#10
#14
30A-12V
#14
#8
#14
40A-12V
#14
#8
#14
60A-12V
#12
#8
#12
80A-12V
#12
#6
#12
10A-24V
#14
#14
#14
20A-24V
#14
#10
#14
25A-24V
#14
#10
#14
30A-24V
#14
#8
#14
35A-24V
#12
#8
#12
50A-24V
#12
#8
#12
65A-24V
#12
#6
#12
Table 2 - Wire Size Minimum Requirements
Note: All wires specified in the table are rated at 90 °C or 194 °F.
These are recommended sizes. All National and Local Codes must be followed.

5
2.2.2 Output Connections
Built in charge divider/isolator circuitry allows up to three separate battery banks (five banks optional) to be
connected to the charger. The charge divider uses one common negative connection for all batteries. The positive
cable from each battery should be connected to a separate positive DC output terminal. See Figure 3 and 4. Select
proper size for the DC wiring from the wire size Table 2 above. If the distance between the charger’s DC output
and the battery/load exceeds 10 feet, use the Power Cable Guide in Appendix C to minimize the voltage drop
across the wire distance.
Figure 3 – MSM Input and Output Terminals
CAUTION: When connecting the DC cables to the battery, be certain the positive terminal of the charger
is connected to the positive battery terminal and the negative terminal is connected to the negative
battery terminal
Figure 4 - Typical MSM system configuration
Shown with Optional 5 Battery Charger Divider

6
2.3 Charger Fail Alarm Connections
The Charger Fail Alarm is included with one set of Form C contacts as a standard feature on the MSM. Charger
Fail LED will illuminate solid and Charger Fail contacts will De-Energize when alarm is triggered.
Alarm Relay
Relay Logic
Contact Ratings
Charger Fail
De-Energize on Fail
2A @ 30Vdc
Table 3 – Alarm Relay Information
Customer alarm connections are made by pushing in the wiring to the appropriate terminal. To remove the alarm
wire, push a small flat head screwdriver to open the contact point, then pull the wire out and remove the
screwdriver. See Figure 4.
Figure 4 - Charger Alarm Connections
2.4 Temperature Compensation
Temperature Compensation feature of the MSM adjusts the charger’s output voltage based on the temperature
read by the external temperature probe. As a standard, the unit includes a 24 foot long temperature probe. For
a longer temperature probe, the MSM is offered with an Optional 100 foot long probe (11Y).
2.4.1 External Probe Connection Procedure
Before making any connections to the MSM, ensure that the AC Power to the unit is off. Disconnect the battery
from the charger via the battery disconnect breaker or by manually disconnecting the battery cables. Verify that
no voltage is present by using a voltmeter at all input and output terminals.
For the most accurate temperature compensation charging, connect and secure the ring lug of the temperature
probe directly on the negative battery terminal. The lug of the probe is electrically isolated from the compensation
circuitry in the MSM unit, so the battery voltage will not affect the operation of the charger. If it is not possible to
mount the probe directly on the negative terminal of the battery, the probe may be mounted and secured in the
vicinity of the battery installation per the battery manufacturer’s recommendations.
Caution must be taken when installing the temperature probe wires to the charger as polarity is important. Install
the probe wires into the “External Temp Sensor” terminal at the bottom of the unit. After connecting the probe,
enter the configuration menu and make sure that “Temperature Compensation” feature has been enabled (For
more details see section 3.3). To remove the sensor wires, push a small flat head screwdriver to open the contact
point, then pull the wire out and remove the screwdriver. See Figure 4.

7
3 Operation
All equipment is shipped from the factory fully checked and adjusted to factory default settings. Before
connecting the battery check with the battery manufacturer for the correct voltage settings and adjust
the configuration accordingly (refer to section 3.3). Failure to match the charger settings with the
connected battery may damage or shorten the life of the battery.
3.1 Initial Setup
Before starting up the MSM, check and verify that all connections are correct and are tightened securely. Check
that the input voltage and frequency of the power source match the rating on the nameplate of the charger. Apply
AC power to the input terminals of the MSM in order to start up the charger.
3.2 Front Display and Indicators
Upon powering up the MSM, the LCD will display the unit’s software revision and LED’s will perform a lamp test.
After the unit has completed the Start-up procedure, the “AC ON” indicator on the front panel will illuminate and
the LCD will show the DC output voltage and DC output current readings.
Figure 5 – Front Panel Display
3.2.1 Controls
Up/Down Arrows – The Up and Down arrows are strictly used for navigating through the configuration menu
and increasing or decreasing setting values.
Back Button – Pressing the back arrow button allows the user to navigate to a previous screen or out of the
configuration menu.
SET Button – The Set button is used to access the configuration menu, allow the user to set the charger
parameters and make selections within the menus.
ON/OFF Button – ON/OFF button is used to disable or enable the output of the unit by pushing and holding this
button for 2 seconds.

8
3.2.2 LED Indicators/Alarms
LCD Display – The LCD Display shows the output DC voltage and output DC amperage at all times. Charger
modes and different alarm conditions will be also be displayed if they should occur.
Current Limit (Red) – The Current Limit LED will illuminate when the rectifier is operating in a current limit
condition (amperage greater than unit output rating).
AC On (Green) – The AC ON LED will illuminate whenever AC voltage is present at the MSM input terminals. AC
ON LED will turn off when AC input is out of range (below 95 or above 270VAC).
Charger Fail (Red) – The Charger Fail/Low Current LED will remain lit and the LCD display will read “CHARGER
FAIL” with the following charger conditions:
- Charger is not able to regulate the output voltage.
- AC input is out of range (below 95 or above 270VAC), LCD will also display “AC OUT OF RANGE”
- DC output is turned off via ON/OFF Button on front panel, LCD display will read “DC OUTPUT OFF”.
- Unit ambient temperature exceeds 70°C, LCD will also display “THEMAL SHUTDOWN”.
Low Current (Red) – The Charger Fail/Low Current LED will illuminate and continue blinking when the DC
current is below 0.25 Amps.
Thermal Derating – With Thermal derating feature enabled, “THERMAL PROTECTION - OUTPUT DERRATED TO
70%” will display on the LCD when the ambient temperature exceeds 50°C.
Thermal Shutdown – “THERMAL SHUTDOWN” will display on the LCD and the unit output will shut off when
the ambient temperature exceeds 70°C.

9
3.3 Configure Mode
To enter the configuration mode press the “SET” button. Once in configure mode, use the Up and Down buttons
to cycle through the available options and the set button to choose the highlighted option. See the chart below
for the adjustable settings in the calibration mode. The controller settings will remain stored even in the event
of total power failure.
Figure 6 - MSM Configuration Tree

10
3.3.1 Setting Output Mode
Press SET with “CHARGING MODE” selected to change output mode.

Float charging mode is used for all normal battery charging needs.
Equalize mode is used when it is necessary to equalize (or balance) the level of charge across all cells present in
the battery. Consult the battery manufacturer for the proper equalize procedures and parameters.
If the charger is in Equalize mode it will automatically switch back to Float mode after the designated equalize
time, or the charger can manually be switched to float mode by selecting FLOAT MODE in the menu.
3.3.2 Setting Battery Type
Press SET with “BATTERY TYPE” selected to change the battery type being used.

Recommended battery voltage settings. Please confirm with battery manufacturer.
Table 4 - Recommended Voltage settings
3.3.3 Setting Float Voltage
Press SET with “FLOAT VOLTAGE” selected to change the float voltage.

Pressing the UP button will increment the voltage by 0.1V. Pressing the DOWN button will decrement the output
voltage by 0.1V. The output voltage setting range for 12V units is 10.5 to 14.1V, with a default value of 13.5V.
The output voltage setting for 24V units is 21 – 28.2V, with a default value of 27.2V. Pressing the SET button will
store the value in memory and return to the configuration menu.
3.3.4 Setting Equalize Voltage
Press SET with “EQUALIZE MODE” selected to access the equalize settings. While in “EQUALIZE MODE”, press
SET with “EQUALIZE VOLT” selected to change the Equalize voltage.


Pressing the UP button will increment the voltage by 0.1V. Pressing the DOWN button will decrement the output
voltage by 0.1V. The output voltage setting range for 12V units is 13.0 to 14.5 V, with a default value of 14.1V.
The output voltage setting for 24V units is 26 to 29V, with a default value of 28.2V. Pressing the SET button will
store the value in memory and return to the configuration menu.
Battery Type
Float Voltage
Equalize Voltage
Lead Acid
13.1 V for 12V units
26.1 V for 24V units
14.1 V for 12V units
27.9 V for 24V units
VRLA/AGM/Gel
13.5 V for 12V units
27 V for 24V units
13.6 V for 12V units
27.3 V for 24V units
NiCad
12.6 V for 12V units
26.6 V for 24V units
13.9 V for 12V units
29.0 V for 24V units
>CHARGING MODE
BATTERY TYPE
>FLOAT MODE
EQUALIZE MODE
>BATTERY TYPE
FLOAT VOLTAGE
>LEAD ACID
VRLA/AGM/GEL
>FLOAT VOLTAGE
EQUALIZE MODE
FLOAT VOLTAGE
13.5 Vdc
>EQUALIZE MODE
SET CURR. LIMIT
>EQUALIZE VOLT
EQUALIZE TIMER
EQUALIZE VOLT
14.1 Vdc

11
3.3.5 Setting Equalize Timer
While in the “EQUALIZE MODE” menu, press SET with “EQUALIZE TIMER” selected in order to change the equalize
timer.


The Equalize Timer setting changes the amount of time that the charger remains in equalize charging cycle once
activated. When an equalize cycle is started the charger will remain in equalize mode until the time selected by
this setting has passed. The equalize timer can be set between 1-24 hours, in increments of 1 Hr. By default the
equalize timer is set for 8 hours. Pressing the SET button will store the value in memory and return to the
“EQUALIZE MODE” menu.
3.3.6 Setting Equalize Cycle
While in the “EQ MODE” menu, press SET with “EQUALIZE CYCLE” selected in order to change the equalize cycle.


The Equalize Cycle determines when the charger will go into an equalize charging. The cycles are “MANUAL”, “7
DAYS” and “30 DAYS”. The asterisk (*) on the display indicates the current setting. The default setting for the
equalize cycle is MANUAL. Pressing the SET button will store the value in memory. Press BACK to return to the
configuration menu.
3.3.7 Setting Current Limit
Press SET with “SET CURR. LIMIT” selected to change the maximum charging current of the MSM battery charger.

Pressing the UP button will increment the current limit by 1%. Pressing the DOWN button will decrement the
current limit by 1%. The range for the battery current limit is 50 – 100%. The default value is 100%. Please
consult the battery manufacturer for the maximum charging current of the connected batteries. Pressing the SET
button will store the value in memory and return to the configuration menu.
3.3.8 AC Mains Voltage
Press SET with “MAINS VOLTAGE” selected to view the Voltage from the AC mains. The Mains Voltage is not a
setting; it is simply a way to view the AC Voltage present to the MSM. Press BACK to return to the configuration
menu.
3.3.9 Thermal Derating
Press SET with “THERM.DERATING” selected to enable/disable Thermal Derating feature. The asterisk (*) on the
display indicates the current setting. When enabled, the unit will monitor the rectifier’s temperature. If the
ambient temperature exceeds 50°C, it will lower the current limit to 70% in order to prevent the charger from
overheating. LCD will display scrolling message “THERMAL PROTECTION –OUTPUT DERRATED TO 70%”. When
the ambient temperature returns below 50°C, the current limit will return to the previously set value. When
“Therm. Derating” is disabled, the unit will provide maximum required output regardless of ambient temperature.

> EQUALIZE MODE
SET CURR. LIMIT
>EQUALIZE TIMER
EQUALIZE CYCLE
EQUALIZE TIME
08 Hour
> EQUALIZE MODE
SET CURR. LIMIT
>EQUALIZE CYCLE
EQUALIZE VOLT
*MANUAL
7 DAYS
>SET CURR. LIMIT
MAINS VOLTAGE
CURRENT LIMIT
100%
> MAINS VOLTAGE
THERM. DERATING
MAINS VOLTAGE
120 Vac

12

Additionally, all chargers are equipped with a thermal shutdown function; which cannot be disabled. If the ambient
temperature exceeds 70°C, the DC output will shut off. LCD will display “THERMAL SHUTDOWN” and “CHARGER
FAIL”. The charger will continue to monitor the ambient temperature, when the temperature returns to a safe
level of 40°C the output will be restored.
To turn on temperature derating move the arrow in front of the “ENABLE” selection and press SET. To turn off
thermal derating move the arrow in front of the “DISABLE” selection and press SET.
3.3.7 Temperature Compensation
Press SET with “TEMP. COMP.” selected to set Temperature Compensation. The asterisk (*) on the display
indicates the current setting. When enabled the output voltage will change dynamically in respect to the external
temperature probe of the MSM. The MSM compensates at 3mV per cell of every °C change.

To turn on temperature compensation move the arrow in front of the “ENABLE” selection and press SET. To turn
off temperature compensation move the arrow in front of the “DISABLE” selection and press SET.
3.3.8 Low Current Alarm
Press SET with “LOW CURR. ALARM” selected to enable/disable the low current alarm. The asterisk (*) on the
display indicates the current setting. When enabled the Low Current Alarm will be activated when the DC current
is below 0.25 Amps. The Low Current Alarm shares the same LED as the Charger Fail Alarm. In the case of low
current the LED will blink.

To turn on low current alarm move the arrow in front of the “ENABLE” selection and press SET. To turn off low
current alarm move the arrow in front of the “DISABLE” selection and press SET.
3.3.9 Cranking Off
Press SET with “CRANKING OFF” selected to enable/disable the Auto DC Output feature.

With this feature enabled, during engine cranking the output of the charger will be disabled. The output will stay
disabled for 100 seconds. The message “CRANKING OFF” will appear on the LCD screen. However, the alarm LED
and the relay contacts will not be triggered. The cranking off feature is activated after the unit ramps up.
3.3.10 Default Setting
Press SET with “DEFAULT SETTING” selected to reset the controller settings to default. The control will ask to
verify the reset settings. Press SET to reset the settings or BACK to exit and cancel the change.


> THERM.DERATING
TEMP. COMP.
> *ENABLE
DISABLE
> TEMP. COMP.
LOW CURR. ALARM
> ENABLE
* DISABLE
>LOW CURR. ALARM
CRANKING OFF
> ENABLE
* DISABLE
>CRANKING OFF
DEFAULT SETTING
> * ENABLE
DISABLE
>DEFAULT SETTING
SET O/P VOLTAGE
SET TO ACCEPT
BACK TO EXIT
EXITING
CONFIGURATION

13
4 Service
All work inside the MSM should be performed by a qualified electrician. La Marche is not responsible for any
damages caused by an unqualified technician.
Before working inside the MSM ensure that the AC Power is off at the main breaker box. Disconnect
the battery from the charger via the battery disconnect breaker or manually disconnecting the battery
cables. Verify that no voltage is present by using a voltmeter at all input and output terminals.
4.1 Performing Routine Maintenance
Although very little maintenance is required with the MSM charger, routine checks and adjustments are
recommended to ensure optimum system performance.
Yearly
1. Confirm air vents are open. Remove dust and debris from interior of charger.
2. Make sure all connections are tight. (make sure the unit is de-energized)
3. Check front panel meters and LEDs for accuracy.
4.2 Troubleshooting Procedure
Troubleshooting should be performed only by trained service personnel or experienced electricians. Before
setting up any complicated testing, give the unit a general inspection.
Check the following:
1. Check DC output cables, connections, battery type, and number of cells against the unit’s rating.
2. Check unit specifications against customer order.
3. Check input connections, input voltage and feeder breaker/fuse
4. Check any internal wiring, fuses, and breakers.
5. Check for shipping damage, loose connections, broken wires, etc.
6. Certain failures can be caused by defective batteries; make sure batteries are free from defects.
When calling in for a service inquiry or for troubleshooting assistance, be sure to have all of the following
information on hand:
1. Equipment model number and serial number.
2. The actual AC input voltage.
3. The DC output voltage with and without the battery.
4. Result of the check of the AC and DC fuses/ breakers.
5. The actual DC output current and voltage, measured with battery and load connected to charger.
NOTE: When ordering replacement parts, drawings, or schematics, always give model number and serial
number.

14
Appendix A: MSM Specifications
ELECTRICAL
AC Input
Voltage range: 102 – 264Vac
Frequency Range: 45-65Hz
DC Output
10 – 80A @ 12Vdc
10 – 65A @ 24 Vdc
Output Filtering
Suitable for Valve-Regulated batteries
Regulation
± 0.5% from no load to full load over the specified input voltage, frequency and
ambient temperature range.
Meters
Digital DC Ammeter & DC Voltmeter ± 1% Accuracy
AC Input Voltmeter
PROTECTION
Current Walk-In
The output current will gradually increase after the charger is turned on, eliminating
surges and overshoot
Current Limit
DC Current limiting. Adjustable from 50 to 100% of rated output current.
Input/ Output
Standard AC and DC fuse with surge protection
Reverse Current Polarity
Short circuit protection
Environmental
Thermal Protection
Emergency
Restoration
The battery charger may be connected to a battery which is heavily discharged and
recharge it without clearing any protective devices.
ENVIROMENTAL
Audible Noise
Less than 65dBA at any point 5 feet from any vertical surface
Operating
Temperature
-4 to 122˚F (-20 to 50˚C)
Storage
Temperature
-40 to 185° F (-40 to 85°C)
Relative
Humidity
0 to 95% (non-condensing)
Cooling
Fan-assisted
Shock
The battery charger 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 battery charger in its shipping container withstands vibration encountered in
shipping without physical damage or degradation of the electrical performance.
Altitude
This battery charger is capable of operation at altitudes up to3,000 feet 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).

15
Appendix B: MSM Current draw, Heat loss, and Case size
*BTU/Hr assumes 85% efficiency at 100% load
MSM Model
Number
DC
Output
AC input Current
Draw @ 100% Load
Watts
In
Watts
Out
Watts
Lost
BTU/Hr*
Case
No.
Weight
(Lbs)
Amps
120
Vac
240
Vac
Fuse
Size
12 Volt Systems
10-12V
10
1.5
0.8
15.0
153.2
130.2
23.0
79
201
5
20-12V
20
3.1
1.6
15.0
306.4
260.4
46.0
157
201
5
30-12V
30
4.6
2.4
15.0
459.5
390.6
68.9
236
203
11
40-12V
40
6.0
3.2
15.0
612.7
520.8
91.9
314
203
11
60-12V
60
9.2
4.8
15.0
919.1
781.2
137.9
471
205
18
80-12V
80
12.0
6.4
20.0
1225.4
1041.6
183.8
628
205
18
24 Volt Systems
10-24V
10
2.6
1.4
15.0
306.4
260.4
46.0
157
201
5
20-24V
20
5.2
2.7
15.0
612.7
520.8
91.9
314
203
11
25-24V
25
6.5
3.1
15.0
765.9
651.0
114.9
393
203
11
30-24V
30
7.8
3.8
15.0
919.1
781.2
137.9
471
203
11
35-24V
35
9.1
4.4
15.0
1072.2
911.4
160.8
550
203
11
50-24V
50
13.0
6.3
20.0
1531.8
1302.0
229.8
785
205
18
65-24V
65
16.9
8.2
20.0
1991.3
1692.6
298.7
1020
205
18

16
Appendix C: 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
units DC output terminals and the battery at less than 1/2 volt when unit 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 = Max. allowable amperes for given voltage drop
AVD = Allowable voltage drop
K = 11.1 for commercial (TW) copper wire
= 7.4 for aluminum
Calculating Wire Size Requirements
AVD KLFA
CMA  
Calculating Current Carrying Capacity of Wire
Table 4 - Wire Size/Area Table
KLF AVDCMA
MaxAmp 


Example: If the charger being used has a max ampere output of 33A, and 30 loop feet of copper wire cable is
required with an allowable voltage drop of 0.5Volts, the wire size calculation will be.
AVD KLFA
CMA  
A= 30
LF= 30
K= 11.1
AV= 0.5
5.0 1.113033 
CMA
=21978 or #6AWG wire
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