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MODEL
A75D / A75DE
SCR BATTERY CHARGER
Digital METERS
THREE PHASE
ECN/DATE
CPN124997
20535 – 8/14 20098 – 8/13 20084 – 8/13 19784 – 12/12
106 BRADROCK DRIVE
DES PLAINES, IL. 60018-1967
(847) 299-1188
FAX: (847)299-3061
ISSUE DATE: ECN 19609-7/12
INSTRUCTION DRAWING NUMBER:
P25-
LA75D-A75DE-2
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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This manual contains important safety and operating instructions for the La Marche Power Conversion
Equipment.
Before using this equipment, read all instructions and cautionary markings on (1) unit, (2) battery, and
(3) product using the battery.
CAUTION: To reduce risk of injury and/or damage to the batteries, use only
the type of batteries specified on the charger.
Do not
expose equipment to rain or snow.
Do not
operate equipment if it has received a sharp blow, been dropped, or otherwise damaged in any
way; take it to a qualified serviceman.
Do not
disassemble this unit; take it to a qualified serviceman when service or repair is required.
Incorrect re-assembly may result in a risk of electric shock or fire.
To reduce risk of electric shock, disconnect this unit from the AC supply, and batteries and loads before
attempting any maintenance or cleaning. Turning off controls will not reduce this risk. Wait five (5)
minutes for capacitors to discharge before doing any work.
WARNING – THERE IS A RISK OF EXPLOSIVE GASES AND WORKING IN THE
VICINITY OF A BATTERY IS DANGEROUS. SOME BATTERIES GENERATE EXPLOSIVE
GASES DURING NORMAL BATTERY OPERATION. FOR THIS REASON, IT IS OF
UTMOST IMPORTANCE THAT EACH TIME BEFORE USING THIS UNIT, YOU READ
THIS MANUAL AND FOLLOW THE INSTRUCTIONS EXACTLY.
To reduce risk of battery explosion, follow these instructions and those published by the battery
manufacturer and manufacturer of any equipment you intend to use in the vicinity of the battery.
Review cautionary marking on all products.
PERSONAL PRECAUTIONS:
1. Someone should be within range of your voice or close enough to come to your aid when you
work near a battery.
2. Have plenty of fresh water and soap nearby in case the battery electrolyte contacts skin,
clothing, or eyes.
3. Wear complete eye protection and clothing protection. Avoid touching eyes while working near a
battery.
4. 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 get medical attention immediately.
5. Never smoke or allow a spark or flame in vicinity of a battery.
6. Be extra cautious, DO NOT drop metal onto a battery. It might spark or short-circuit the battery
or cause an explosion.
7. Remove personal metal items such as rings, bracelets, necklaces, and watches when working
with a battery. A battery can produce a short-circuit current high enough to weld these items
causing severe burns.
8. NEVER charge a frozen battery.
IMPORTANT
SAFETY INSTRUCTIONS
FOR THE
LA MARCHE POWER CONVERSION EQUIPMENT
SAVE THESE INSTRUCTIONS
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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PREPARING TO CHARGE
1. If it is necessary to remove the battery connections, always remove grounded terminal from the
battery first. Make sure all loads are disconnected and unit is off, so as not to cause an arc.
2. Be sure the area around the battery is well ventilated while the battery is being charged.
3. When cleaning battery terminals, be careful to keep corrosion from coming in contact with eyes.
4. Study all the battery manufacturer’s specific precautions such as removing or not removing cell caps
while charging, recommended rates of charge, and maintenance procedures.
UNIT LOCATION
• Never place this unit directly above the standard flooded battery. Gases from the battery will
corrode and damage equipment. A sealed maintenance free or valve regulated lead acid
(VRLA) may be placed below this equipment.
• Never allow the battery electrolyte to drip on this unit when reading the specific gravity or
filling the battery.
• 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.
DC CONNECTION PRECAUTIONS
Connect and disconnect DC output cables only after setting all of this unit's switches to off position and
removing AC input supply.
GROUNDING INSTRUCTIONS
This battery charger should be connected to a grounded, metal, permanent wiring system; or an
equipment grounding conductor should be run with circuit conductors and connected to equipmentgrounding terminal or lead on battery charger. Connections to battery should comply with all local codes
and ordinances.
CAUTION: DO NOT PULL ON OUTPUT CABLES WHEN DISCONNECTING CHARGER FROM BATTERY.
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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RECEIVING INSTRUCTIONS
AND
GENERAL EQUIPMENT INFORMATION
CAUTION: To ensure safe installation and operation, the information given
in the instruction manual should be read and understood before installing or
using the equipment.
RECEIVING INSTRUCTIONS
Unpacking and Inspection: Examine the shipping crate upon arrival. If there is obvious damage, describe
on the receiving documents. Within a few days after delivery, the equipment should be uncrated and
carefully inspected for hidden damages. When removing packaging material, be careful not to discard
any equipment, parts, or manuals. If any damage is detected you should:
1. File a claim with the carrier within five (5) days.
2. Send a copy of the claim to La Marche Mfg. Co.
3. Call La Marche Mfg. For a RETURN MATERIAL AUTHORIZATION NUMBER.
Failure to properly file a claim for shipping damages, or provide a copy of the claim to La
Marche Mfg., may void warranty service for any physical damages reported for repair.
HANDLING
WARNING: Equipment can be very heavy, and 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.
NOMENCLATURE PLATES
Each piece of La Marche Mfg. Equipment shipped is identified by part number on the nomenclature plate.
ADJUSTMENTS
All equipment is shipped from the factory fully checked and adjusted. Do not make any adjustments
unless the equipment has been powered-up and the settings have been determined to be incorrect.
SPARE PARTS
To minimize downtime during installation or normal service, it is advisable to purchase spare fuses, circuit
boards and other recommended components. Please refer to the list of recommended spare parts and
their La Marche Mfg. Part numbers included with the instruction manual. It is recommended that spare
fuses be ordered for all systems.
To order spare parts, please contact La Marche Mfg. (847)-299-1188 during business hours
and ask for the Parts Department.
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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***CAPACITOR PRE-CHARGE INSTRUCTIONS***
WARNING: READ INSTRUCTIONS BEFORE CONNECTING BATTERY
To prevent the DC output fuse from blowing when connecting the battery,
connections to the power supply and batteries should be done in the
following order (single power supply).
• Connect AC input line to the terminal block provided. Be sure the units’ AC circuit breaker is off.
• Observe the polarity of the battery cables, charger output, and relay rack terminals. Connect the
proper battery cable to the ground bar or battery charger output terminal.
• Energize the power supply by turning on the units' AC breaker. This will charge the capacitors inside
the power supply and eliminate heavy arcing when the remaining battery cable is connected. After
approximately one (1) minute, turn off the power supply and immediately connect the remaining
battery cable.
• Connect loads.
• Turn on the power supply again and the charger will commence charging the batteries and powering
the load. (NOTE: For units equipped with a low-voltage disconnect panel, the "Load On" switch
must be put in the "Load On" position.)
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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GENERAL
The LaMarche models A75D and A75DE are SCR battery chargers. These models are designed with a
LCD Digital Display. The A75DE is designed as a battery eliminator and can be operated with or without
batteries connected.
The LaMarche model A75D/A75DE series battery charger is a solid state unit utilizing SCR technology. It
has +/- 0.5% regulation from no load to full load over the specified input voltage, frequency and ambient
temperature range.
The A75D/A75DE series is offered with DC output voltages of 24, 48 or 130VDC with output currents
from 25 to 500 Amps. These chargers may be powered with 208, 240, or 480VAC. The current limit is
factory set at 105% and is adjustable from 50 to 110%.
OUTPUT RATINGS
DC VOLTAGE
The A75D/A75DE series battery chargers provide separate voltage adjustments for floating or equalizing
lead or nickel cadmium cells. The float or equalize mode of operation is selected by pressing the equalize
button on the display which is located on the front of the battery charger.
The factory settings are as follows:
Float Voltage Equalize Voltage
2.17 volts/cell (lead)
2.25 volts/cell (VRLA)
2.33 volts/cell (Lead)
2.27 volts/cell (VRLA)
1.40 volts/cell (NC) 1.55 volts/cell (NC)
VOLTAGE RANGE
Float Equalize Lead Acid NiCad
24V
23 – 29.5 24 - 31 11 – 13L 17 – 20N
48V
46 - 57 48 - 61 22 – 26L 33 – 39N
130V
115 - 140 123 - 145 53 – 62L 83 – 93N
Note:
Typical cell ranges are based on the following:
Lead Acid 2.17 V/C Float, 2.33V/C Equalize
NiCad 1.44 V/C Float, 1.55V/C Equalize
OUTPUT CURRENT
See Input Current Chart
REGULATION
Steady State output voltage remains within +/- 0.5% of rated voltage for any load current from no load
to full load and for input voltages within +10% / -12%.
FILTERING
A75D – NO FILTERING
A75DE - 100 mv RMS, with or without a battery connected
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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MEAN TIME BETWEEN FAILURE
The mean time between failure (MTBF) in excess of 100,000 hours at 50 degrees C
INPUT RATINGS
AC VOLTAGE
25 Amps through 500 Amps models at 208Vac or 240Vac or 480Vac
INPUT FREQUENCY RANGE
60Hz +/- 5%
INPUT CURRENT – THREE PHASE
THREE PHASE VOLTAGE
MODEL
NUMBER D
B C
A75D/A75DE- 208 240 480
50 - 24V 30 26 13
75 – 24V 44 38 19
100 – 24V 59 51 26
125 – 24V 74 64 32
150 – 24V 89 77 38
200 – 24V 118 102 51
50 – 48V 15 13 6
75 – 48V 22 19 10
100 – 48V 30 26 13
125 – 48V 37 32 16
150 – 48V 44 38 19
200 – 48V 59 51 26
250 – 48V 74 64 32
300 - 48V 89 77 38
400 - 48V 118 102 51
25- 130V 18 16 8
30- 130V 22 19 10
40 -130V 30 26 13
50 -130V 37 32 16
75 – 130V 55 48 24
100 -130V 74 64 32
125- 130V 92 80 40
150 -130V 111 96 48
200 -130V 148 128 64
250 -130V 185 160 80
300 -130V 222 192 96
400 -130V 296 256 128
500 –130V 360 312 156
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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SPECIFICATIONS
ELECTRICAL
AC Input
Voltage range +10% / -12%
Frequency Range 60Hz +/- 5%
DC Output
6 to 500 amps
24 or 48 or 130Vdc
Output Filtering
A75D NO FILTERING
A75DE - 100mv RMS, with or without battery connected, for a three phase unit
Regulation
+/- 0.5% from no load to full load over the specified input voltage, frequency and ambient temperature
range.
Audible Noise
Less than 65dBA at any point 5 feet from any vertical surface of the battery charger.
Load Sharing
The Load sharing terminal is located inside the unit. When connected, identical LaMarche units are forced
to load share. Connect the LS terminals together. When load sharing is used, the chargers must switch
into equalize at the same time. If option 57R is used the RE terminals of all chargers can be connected
together to ensure all chargers automatically switch into (and out of) equalize mode together.
PROTECTION
Current Walk-In
The output current gradually increases after the charger is turned on, eliminating surges and overshoot.
Current Limit
Electronic current limiting control circuitry provides for an adjustable current limit of 50 to 110% output
current. It is factory set at 105%.
AC Breaker
AC breaker is standard equipment.
DC Breaker
DC breaker is standard equipment.
INDICATORS
On the LCD Digital display the DC Voltage and Amps are displayed. The timer mode and time remaining
are also displayed. There is also a Red Alarm indicator, when this Led is lit, the type of alarm will
indicate on the digital display and the correct Led listed below will indicate.
Led Indications for:
Float – Green Summary - Red
Equalize – Yellow Positive and Negative Ground - Red
AC “ON” – Green AC Failure – Red
High DC Voltage – Red Low Voltage / End of Discharge – Red
High DC Voltage Shutdown – Red Low DC Current – Red
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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PARALLELING
This battery charger will parallel with any other LaMarche model A75D/A75DE with the same output
voltage.
LOAD SHARING
A load sharing circuit is provided. When connected two (2) or more A75D/A75DE units are forced to
share the load equally (less than +/- 5%). To load share, connect the unit outputs (must be the same
DC voltage) in parallel and connect the LS terminals together. If the charger is equipped with a Remote
Equalize Terminal, connect the RE terminals together.
CURRENT WALK-IN
Output current will gradually increase after the battery charger is turned on, reducing current surges.
EMERGENCY RESTORATION
The battery charger may be connected to a battery which is heavily discharged and recharge it without
clearing any protective devices.
METERS
LCD Digital Display
1% Accuracy DC Ammeter
1% Accuracy DC Voltmeter
ENVIRONMENTAL
OPERATING TEMPERATURE:
0 to 50 degrees C (32 to 122 degrees F)
STORAGE TEMPERATURE:
-40 to 85 degrees C (-40 to 185 degrees F)
RELATIVE HUMIDITY:
0 to 95% (non-condensing)
COOLING:
Convection cooled
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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SHOCK
The battery charger in its shipping container withstands shock developed when one edge of the container
is dropped six (6) inches while the opposite edge is resting on the ground, or it is dropped two (2) inches
without any physical damage or degradation of the electrical performance.
VIBRATION
The battery charger in its shipping contained, 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 to 10,000 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).
INSTALLATION INFORMATION
MINIMUM WIRE SIZES
See Wire Size Chart, lists the ac input and dc output minimum wire size requirements. 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 that ½ volt when the unit is fully loaded. See the section on
“POWER CABLING FORMULAS”. The total loop length is twice the distance from the wiring point to the
unit.
NATIONAL CODES
These wire sizes are based on those recommended in the National Electric Code table 310-16 for copper
wire at 75 degrees C conductor temperature operating in an ambient of 30 degrees C. For higher
operation temperatures refer to the de-rating factors in the National Electric Code table 310-16.
FIELD GROUND TERMINAL
This terminal should be connected to an earth ground. The size of the conductor is based on National
Electric Code table 250-95 for copper wire at 75 degrees C. See table for recommended wire sizes.
MOUNTING
Install the battery charger so that the flow of air through the ventilators is not obstructed.
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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POWER CABLING FORMULAS
SIZE
AWG.
AREA
CIR.
MILS
SIZE
AWG.
MCM*
AREA
CIR.
MILS
SIZE
MCM*
AREA
CIR.
MILS
18 1620 1 83690 600 600000
16 2580 1/0 105600 700 700000
14 4110 2/0 133100 750 750000
12 6530 3/0 167800 800 800000
10 10380 4/0 211600 900 900000
8 16510 250 250000 1000 1000000
6 26240 300 300000 1250 1250000
4 41740 350 350000 1500 1500000
3 52620 400 400000 1750 1750000
2 66360 500 500000 2000 2000000
*DENOTES ALL SIZES LARGER THAN =0000 ARE EXPRESSED IN MCM.
TABLE OF CONVENTIONS
CMA = Cross section of wire in circular MIL area
A = Ultimate drain in amperes
LF = Conductor loop feet
MAX AMP = Maximum allowable amperes for given voltage drop
AVD = Allowable voltage drop
K = 11.1 Constant factor for
commercial (TW type) copper wire
(KS5482-01)
= 17.4 for aluminum (KS20189)
Calculating Wire Size Requirements
CMA
= A X LF X K
AVD
Calculating Current carrying capacity of wire
Max Amp
=
CMA X AVD
LF X K
Source: Handbook 100-National Bureau of Standards
NOTE: All Wire #6 and larger is stranded.
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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NOTE: These are recommended wire size. All National and Local Wiring Codes must be followed.
The table lists the AC input and the DC output minimum wire size requirements. 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 the unit is fully loaded. If the distance between the units DC output and the battery
exceeds 10 feet, use the Power Cable Formula to determine wire size.
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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ELECTRICAL CONNECTIONS & FIELD WIRING
A terminal board is provided for connecting the AC input and DC output. A ground wire must be
connected to the unit’s case ground.
AC INPUT
Make sure that AC power is off at the main AC breaker box before installation begins.
Make sure that the input source is the same voltage and frequency as that which is marked on the
nameplate of the rectifier.
The wire size and distribution protection should be adequate for the nameplate input current of the
rectifier plus the overload current (usually 10%-15% higher than the nominal rating).
An adequate earth ground lead should be connected to the terminal marked “GROUND” or “GND”.
DC OUTPUT
Make sure that the battery voltage, which is being connected to the rectifier, matches the rectifiers
output voltage.
*****OBSERVE PROPER POLARITY!*****
The negative wire from the battery must be connected to the terminal marked “NEGATIVE” or “NEG” and
the positive wire from the battery must be connected to the terminal marked “POSITIVE” or “POS” on the
rectifier.
To prevent the DC output breaker from tripping when connecting the battery, connections to the power
supply and batteries should be done in the following order (single power supply).
1. Connect AC input line to the terminal block provided. Be sure the AC circuit breaker is off.
2. Observe the polarity of the battery cables and the rectifier output. Connect the negative battery cable to the
negative rectifier output terminal.
3. Energize the unit by turning the AC breaker to the “ON” position. This will charge the capacitors inside the
power supply and eliminate heavy arcing when the remaining battery cable is connected. After approximately
one (1) minute, turn off the power supply and immediately connect the remaining battery cable.
4. Connect the loads.
5. Turn the AC breaker to the “ON” position again and the rectifier will commence charging the batteries and
powering the load.
LOAD SHARING
A load sharing circuit is provided as a standard feature of the A75D/A75DE. When connected two (2) or
more identical A75D/A75DE units are forced to share the load equally (less than +/- 5%). To load share,
connect the unit outputs (must be the same DC voltage) in parallel and connect the LS terminals
together. If the charger is equipped with a Remote Equalize Terminal, connect the RE terminals
together. The remote equalize connection forces the chargers to enter equalize mode at the same time.
GROUND DETECTION
If ground detection is desired, the green wire should be installed in the GND DET terminal of J9 terminal
block of the S2A-362 control PCB. To disable, move wire to GND DET DEFEAT terminal of J9.
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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ALARM CONNECTIONS
Form “C” contacts are provided which indicate an AC power failure and Summary Alarm. The AC failure
contacts energize on alarm, the summary contacts de-energize on alarm. There is a 5 second delay on
alarm. The contacts are rated at 60Va at 125 Vdc or AC. All relay contacts are shown in the de-energized
state on schematics. The AC failure alarm is shown in non-alarm state on the schematic. The Summary
alarm is shown in alarm state on the schematic. Customer alarm connections should be made
accordingly.
OPERATION
START UP
When all connections have been made, verify that they are correct!
Apply the correct AC voltage to the input terminals.
Verify the output voltage, output current, and the alarm and status lights to be sure the unit is operating
properly.
If the unit is not operating correctly check the connections again and read “TROUBLE SHOOTING”.
ADJUSTMENTS
CURRENT LIMIT ADJUSTMENT
The current limit adjustment is factory set at approximately 105% of rated DC output current. The
adjustment provides a means of changing the rectifier current limit between 50-110% of rated output.
Turning the adjustment, which is located on the unit front panel, clockwise lowers the current limit;
turning counterclockwise raises the current limit.
CAUTION: CURRENT LIMIT MUST NOT EXCEED 110%. OF RATED OUTPUT CURRENT.
FLOAT ADJUSTMENT
The float adjustment is factory set at 2.17 volts/cell (Lead), 2.25volts/cell (VRLA) or 1.4 volts/cell (N.C.).
Turning the adjustment, which is located on the front door of the unit, clockwise raises the float voltage
(the F/E switch must be in the float position).
The adjustable range is as follows:
2.12-2.3 volts/cell +/- .1 Volts (Lead) (VRLA)
1.39-1.45 volts/cell +/- .1 Volts (N.C.)
EQUALIZE/SELECT SWITCH:
This switch is located on the unit front panel.
EQUALIZE ADJUSTMENT
The equalize adjustment is factory set at 2.33 volts/cell (Lead), 2.27 volts/cell (VRLA) or 1.55 volts/cell
(N.C.). Turning the adjustment, which is located on the front panel of the unit, clockwise raises the
equalize voltage (the F/E switch must be in the equalize position).
The adjustable range is as follows:
2.25-2.4 volts/cell +/- .1 Volts (Lead) (VRLA)
1.5 - 1.6 volts/cell +/- .1 Volts (N.C.)
In the equalize position, the rectifier will maintain the battery at the voltage level preset by the “Equalize”
potentiometer adjustment and at the same time maintain the load up to the rectifier’s rated output.
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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DIGITAL DISPLAY
OPERATION
Once the proper AC input and battery are connected to the system, the digital display will indicate the
system DC Output Voltage and Output Current. Pushing the "UP" button changes the display.
The following items can be checked:
• AUTO EQUALIZE TIMER MODE
• AUTO EQUALIZE OFF/ON
• EQUALIZE TIME
• AC ALARM
• LOW VOLTAGE 1 ALARM
• BATTERY END OF DISCHARGE
• HIGH VOLTAGE ALARM
• HIGH VOLTAGE SHUT DOWN ALARM
NOTE: To reset the HVSD Alarm, push the LMC Logo on the
membrane panel.
• LOW DC CURRENT ALARM
• SUMMARY ALARM
ALARM IDENTIFICATION:
If the alarm condition occurs (Alarm LED ON) the specific failure can be identified by using the UP button
to scroll thru each alarm setting, FAIL on the display will indicate which alarm is ON.
This alarm package is shipped with the following factory settings, unless otherwise specified.
Low DC voltage (1):
Battery End of Discharge:
1.98 Vpc Lead-Acid
1.75 Vpc Lead-Acid
Flashing LED
Solid LED
High DC voltage : 2.45 Vpc Lead-Acid
High DC voltage shutdown
(HVSD):
2.5 Vpc Lead-Acid
Low DC current: .5 A
Timer mode: Mode 0
Equalize Time: 8 Hours
OPT. 46R – RELAY PACKAGE -
2 SETS OF “FORM C
” CONTACTS FOR EACH ALARM
These relay contacts cover the following conditions: Low DCV, High DCV, High DCV Shutdown, Low DCA,
Positive Ground, Negative Ground, Battery End of Discharge and Charger Failure. A Charger Failure
alarm occurs when one of the following conditions are present: Simultaneous Low DC Voltage and Low
DC Current, or High Voltage Shutdown.
Certain alarm relays are de-energized on failure, and
certain alarm relays are energized on failure. All relay
contacts are shown in the de-energized state on
schematics. Set A alarms are shown in non-alarm state
on the schematic. Set B alarms are shown in alarm
state on the schematic. Customer alarm connections
should be made accordingly.
Note: All alarm contacts are factory set for a 5 second delay except the high voltage shutdown contacts,
which are set for a 20 second delay.
Energized on Alarm
(Set A)
De-Energized on Alarm
(Set B)
AC Failure Summary
High DCV Low DCV
High DCV Shutdown End of Discharge
Positive Ground Low DCA
Negative Ground Charger Failure
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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Contact Data:
LOAD RESISTIVE LOAD (p.f. = 1)
Rated load 0.60va at 120Vac
2A at 30Vdc
Contact material Ag(Au clad)
Carry current 2A
Max. operating voltage 125Vac
125Vdc
Max. operating current 2A
Max. switching capacity 62.50Va
60W
Min. permissible load 10uA, 10mVdc
To check or reset the Alarm Settings, push the "UP" button for 1 second then at the same time push the
"MODE" button for 5 seconds. The display will read CUSTOMER CAL.. Push the "MODE" button to
change the display to the next desired setting. To raise the setting, use the "UP" button, to lower use
the "DOWN" button.
TIMER MODES
NOTE: IN ALL MODES, THE UNIT WILL RETURN TO FLOAT IF THE EQUALIZE SWITCH IS PUSHED.
MODE 0
DISPLAY indicates P00
This is the standard timer mode. If the "EQUALIZE" switch is pushed the timer will switch the charger
into the equalize mode and the equalize "LED" will indicate. The timer will automatically return the
charger to the float mode when the equalize cycle is complete.
MODE 1
DISPLAY indicates P01
This mode of operation automatically starts an equalize cycle every 7 days after. The length of this cycle
is again determined by the timer setting. After the equalize period the timer will wait for another 7 days
and then restart.
MODE 2
DISPLAY indicates P02
This mode of operation automatically starts an equalize cycle every 14 days. The length of this cycle is
again determined by the timer setting. After the equalize period the timer will wait for another 14 days
and then restart.
MODE 3
DISPLAY indicates P03
This mode of operation automatically starts an equalize cycle every 30 days. The length of this cycle is
again determined by the timer setting. After the equalize period the timer will wait for another 30 days
and then restart.
MODE 4
DISPLAY indicates P04
This mode of operation automatically starts an equalize cycle when the DC voltage drops below the low
voltage setting for 30 seconds or longer. The battery voltage must rise approximately 8% above the low
voltage set point.
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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TROUBLE SHOOTING
Troubleshooting should be performed only by trained service personnel or experienced electricians.
CAUTION: Hazardous AC and DC voltages are present within the rectifier cabinet.
EQUIPMENT:
The only equipment required is a multimeter for voltage or resistance readings and analog ohmmeter
GENERAL INSPECTION
On servicing new equipment, before setting up any complicated testing or jumping to any conclusions,
give the unit a general inspection.
Check the following:
1. Check DC output cables, connections, battery type, and number of battery cells with rectifier rating.
2. Check unit specifications with customer order.
3. Check input connections, input voltage and line breaker size.
4. Check for shipping damage, loose connections, broken wires, etc.
5. Certain failures can be caused by defective batteries and customer loads; make sure batteries and
loads are free from defects.
NOTE: If the problem is found to be located in the printed circuit boards, the board should be replaced.
No attempt should be made to repair circuit boards in the field.
SERVICE INFORMATION
Information you should have when calling in for troubleshooting assistance:
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 AC breaker and DC output fuse.
5. The actual DC output current and voltage when measured with battery and load connected to
rectifier.
SYMPTOMS & CAUSES
A.C Breaker Trips
Possible Cause:
1. Wrong AC input voltage.
2. An AC to DC short or AC or DC short to ground (see ground short circuit test).
3. High DC output voltage.
Check battery voltage for proper number of cells.
Check control fuse on alarm interface board.
Float/Equalize voltage potentiometers not set properly. (See Float/Equalize adjustment
procedure for proper voltage setting.)
4.
Check for shorted SCR’s.
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INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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DC Breaker Trips
Possible Cause:
1. Shorted power SCR. (repair/replace as required).
2. Shorted battery cells or customer equipment.
3. Shorted output cables.
4. Capacitors not pre-charged.
5. Loose connections on the DC fuse.
Charger operates but output voltage/current is low.
Possible Cause:
1. Float/Equalize voltage potentiometers not set correctly (see float/equalize adjustment
procedure for proper voltage setting).
2. Check SCR’s
3. Control assembly is defective. (Replace as required)
4. Unit in current limit.
5. Defective shunt.
Charger operates but output voltage is high.
Possible Cause:
1. Float/Equalize voltage pots not set correctly (see float/equalize adjustment procedure for
proper voltage setting).
2. Control assembly is defective. (Replace as required)
Ground and short circuit test.
A simple ohmmeter check can be performed to check the unit for a short to ground,
primary to secondary breakdown, AC-DC short, or DC ground. Before installation of a
new unit, the above checks should be made before installing. If a short of this type is
suspected on a unit in service, check as follows:
1. Disconnect AC input power to the unit. Disconnect the DC battery and loads from the rectifier.
2. Set ohmmeter scale on ohms scale RX100.
3. Measure from one terminal of the input to one terminal of the output. Meter should not
indicate. If the meter reads full scale deflection, this indicates an ac-dc short. During
shipping, an AC wire may rub against the DC lugs, terminals, etc. and cause a short. These
problems may be eliminated by being very careful in inspecting the wiring to make certain the
AC wires are not touching the DC wiring.
4. Check the input terminals to ground and check the output terminals ground. If the meter
indicates full scale deflection, a wire is touching a metal part of the rectifier. Look for wires
that are near any metal part and inspect for possible breakdown caused by shipping. The
heatsink of the diodes and the control unit are insulated from ground through the mounting
legs.
CHECKING CAPACITORS
When checking capacitors be sure all AC power is turned off and battery is disconnected from unit.
Check capacitors with DC voltmeter to see that DC voltage is at near -0- volts, then short circuit
capacitor. Momentarily short circuit the capacitor leads to assure complete discharge. Connect the
meter test leads to the capacitor leads or terminals and observe indicated resistance.
A good capacitor will indicate an initial low resistance and gradually increase as the capacitor charges.
The final resistance of a good capacitor is usually several hundred thousand ohms approaching a
megohm.
Initial high resistance approaching infinity indicates an open capacitor. Initial and continued low
resistance readings indicate a shorted capacitor.
When ordering replacement parts, drawings, or schematics, always give model number,
serial number and AC input voltage.
Page 19
INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
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General Maintenance Procedure
Yearly
1. Blow out rectifier/inverter with a low-pressure air hose.
2. Make sure all connections are tight.
3. Perform a visual check on all internal components.
4. Check front panel meters and alarms for accuracy.
4th Year
REPEAT ABOVE WITH THE ADDITION OF:
1. Check relay contacts for pitting or corrosion.
2. Check capacitors for leakage.
7th Year
REPEAT ALL, WITH THE ADDITION OF:
1. Filter, resonating capacitors and control relays should be replaced.
10th Year
REPEAT ALL WITH THE ADDITION OF:
(except replacing capacitors, they should be replaced every 7 years)
1. Check magnetics, components and wiring for signs of excessive heat.
Page 20
INSTALLATION, OPERATING AND TROUBLESHOOTING INSTRUCTIONS FOR MODEL A75D / A75DE –THREE PHASE
Page 20 of 20
MANUFACTURER’S WARRANTY
All La Marche Manufacturing Co. equipment has been thoroughly tested and found to be in proper operating
condition upon shipment from the factory and is warranted to be free from any defect in workmanship and material
that may develop within three (3) years from date of purchase.
Any part or parts of the equipment (except fuses, d.c. connectors and other wear-related items) that prove defective
within a three (3) year period shall be replaced without charge providing such defect, in our opinion, is due to faulty
material or workmanship and not caused by tampering, abuse, misapplication or improper installation.
Should a piece of equipment require repair during the warranty period, the equipment can be returned to the La
Marche factory to have the inspection, parts replacements and testing performed by factory personnel. Should it be
necessary to return a piece of equipment or parts to the factory, the customer or sales representative must obtain
authorization from the factory. If upon inspection at the factory, the defect was due to faulty material or
workmanship, all repairs will be made at no cost to the customer during the first three years. Transportation charges
or duties shall be borne by purchaser.
In accepting delivery of the equipment, the purchaser assumes full responsibility for proper installation, installation
adjustments and service arrangements. Should minor adjustments be required, the local La Marche sales
representative should be contacted to provide this service only.
All sales are final. Only standard LaMarche units will be considered for return. A 25% restocking fee is charged
when return is factory authorized. Special units are not returnable.
In no event shall La Marche Manufacturing Co. have any liability for consequential damages, or loss, damage or
expense directly or indirectly arising from the use of the products, or any inability to use them either separately or in
combination with other equipment or materials, or from any other cause. In addition, any alterations of equipment
made by anyone other than La Marche Manufacturing Co. renders this warranty null and void.
La Marche Manufacturing Co. reserves the right to make revisions in current production of equipment, and assumes
no obligation to incorporate these revisions in earlier models.
The failure of La Marche Manufacturing Co. to object to provisions contained in customers' purchase orders or other
communications shall not be deemed a waiver of the terms or conditions hereof, nor acceptance of such provisions.
The above warranty is exclusive, supersedes and is in lieu of all other warranties, expressed or implied, including any
implied warranty of merchantability or fitness. No person, agent or dealer is authorized to give any warranties on
behalf of the Manufacturer, nor to assume for the Manufacturer any other liability in connection with any of its
products unless made in writing and signed by an official of the manufacturer.
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