Page 1
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
ECN/DATE
MODEL
A75M
MINING
BATTERY CHARGER
Digital Volt/Amp Meter and Electronic Timer
CPN112410
17268 / 10-06
17589 / 9-07 17076/ 2-06
ISSUE DATE: ECN- 17046 / 2-06
106 BRADROCK DRIVE
DES PLAINES, IL. 60018-1967
(847) 299-1188
FAX: (847) 299-3061
INSTRUCTION DRAWING NUMBER:
P25-LA75M-1
PAGE 1 OF 13
Page 2
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
IMPORTANT SAFETY INSTRUCTIONS
1. SAVE THESE INSTRUCTIONS. This manual contains important safety and operating instructions. Before using this
equipment, read all instructions and cautionary markings on (1) unit, (2) battery, and (3) product using the battery.
2. CAUTION: To reduce risk of injury and/or damage to the batteries, use only the type of batteries specified on the
charger nameplate.
3. Do not expose equipment to rain or snow.
4. 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.
5. 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.
6. To reduce risk of electric shock, disconnect this unit from the AC supply, batteries and loads before attempting any
maintenance or cleaning. Turning off controls will not reduce this risk.
7. WARNING – RISK OF EXPLOSIVE GASES
a. 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
b. 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.
8. PERSONAL PRECAUTIONS:
a. Someone should be within range of your voice or close enough to come to your aid when you work near a battery.
b. Have plenty of fresh water and soap nearby in case the battery electrolyte contacts skin, clothing, or eyes.
c. Wear complete eye protection and clothing protection. Avoid touching eyes while working near a battery.
d. 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.
e. Never smoke or allow a spark or flame in vicinity of a battery.
f. Be extra cautious, DO NOT drop metal onto a battery. It might spark or short-circuit the battery or cause an explosion.
g. 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.
h. NEVER charge a frozen battery.
i. Do not use battery charger for charging dry-cell batteries that are commonly used with home appliances. These batteries may burst
and cause injury to person or damage to property.
9. PREPARING TO CHARGE
a. 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.
b. Be sure the area around the battery is well ventilated while the battery is being charged.
c. When cleaning battery terminals, be careful to keep corrosion from coming in contact with eyes.
d. 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.
e. Follow the battery manufacturer's recharging instructions.
10. UNIT LOCATION
a. 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.
b. Never allow the battery electrolyte to drip on this unit when reading the specific gravity or filling the battery.
c. Do not operate this unit in a closed-in area or restrict ventilation in any way.
d. Do not set any battery on top of this unit.
11. 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. Do not pull on output cables when disconnecting charger from battery.
12. 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 equipment-grounding terminal or lead on battery charger.
Connections to battery should comply with all local codes and ordinances.
PAGE 2 OF 13
Page 3
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
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.
PAGE 3 OF 13
Page 4
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
MODEL A75M BATTERY CHARGER
The Model A75M is a SCR controlled industrial battery charger for use on electric vehicle batteries. It is
designed to recharge a battery of the proper amp-hour capacity in eight hours.
The Model A75M features:
* SCR based control
* Automatic start/stop circuitry
* Automatic Sensing of Fully-Charged Battery
* Automatic 12 hour override timer
* 3 Hour timing after 80% (normal mode)
* 6 Hour timing after 80% (equalize mode)
* 3 Selectable current ratings
* Digital Display - Indicates amps, volts, amp hours, elapsed time, cooling time
* "On Charge", "80%/Complete", "Equalize", and "Failure" lamps
* Contact closure delay
* Adjustable DC output (Start/Finish Rate) Note: These output adjustments are inside the unit. SEE SCHEMATIC
A75M OUTPUT CURRENTS
RATING IN AMPS LOW (AH) MED (AH) HIGH (AH)
150 101 (560) 122 (680) 153 (850)
210 157 (875) 180 (1000) 216 (1200)
270 216 (1200) 248 (1375) 270 (1500)
360 270 (1500) 320 (1800) 360 (2000)
PAGE 4 OF 13
Page 5
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
THEORY OF OPERATION & INDICATORS
FRONT PANEL
The panel has a digital display, meter select/equalize (EQ) momentary switch, on/off switch and eight (8) LED
lamps.
The digital display indicates Output Amps, Output Voltage, Ampere Hours Returned, and Elapsed Time Charging
and Cooling Time (elapsed time from end of charge).
A "Meter Select” switch and associated indicator lights allow you to read any one of the four (4) operating
parameters on the digital display. After powering up the unit and connecting the battery, the digital display
indicates the output amperage of the charger. Press the "Select” switch down once and the "Output Voltage"
will be displayed. Press the "Select” switch down a second time and the "Amp Hours Returned" will be
displayed, a third time and the "Elapsed Time Charging" will be displayed.
NOTE: The Charger must be charging the battery for 1 minute to obtain this reading; the amp hours are
updated every minute. A third push of the button shows the elapsed charging time in hours/minutes.
A "EQ” switch when pressed up allows the charger to charge six (6) additional hours after the 80% charge is
reached.
NOTE: The equalize switch can also be used to start the charger even if a battery is discharged below 1.6 Vpc.
Caution must be used when using this feature to start the charger because the initial battery voltage sensing is
being disabled and the wrong battery could be being connected.
An "On/Off” switch allows you to turn off the charger when disconnecting the battery during the charge cycle.
(The on/off switch must be placed back to the "ON" position after the battery is disconnected to activate the
automatic start function.)
The lamps are as follows:
* "On Charge" Lamp
This indicates after the charger has successfully completed the autostart cycle and the input contactor has
closed.
* "80%/Complete" Lamp
This (LED) indicator will flash when the battery voltage reaches 2.40 volts per cell. This means the battery is
80% charged. The 3 (normal) or 6 (equalize) hour timer is activated. At the end of the charge cycle this LED
indicator will be on solid, the display will display amp hours returned (when the amp hour LED is on), Elapsed
time of charge cycle (when the elapsed time LED is on), and the time from charge complete (cooling time) 80%
complete light on.
* "Equalize" Lamp
Lamp indicates when the equalize mode is activated by the equalize switch.
* "Failure" Lamp
The "FAILURE” lamp is a summary alarm. When the failure light illuminates, the number on the digital display
indicates the type of failure. See below:
AC voltage failure 0001 12 hour override timer time out. 0004
Wrong size battery (cells) or Low Battery
0003 High DC current/voltage 0005
Voltage - See Note**
Unit will shut off within 15 minutes if a fully
charged battery is connected to charger
**NOTE: To disable this feature, push the Equalize button. The unit will start. Make sure a battery with the
correct number of cells is connected to the charger.
0007
PAGE 5 OF 13
Page 6
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
The Model A75M charger accomplishes its charge cycle completely automatically without the use of any moving
parts except for the input AC contactor.
It is recommended that the connector used for the battery/charger connection have an auxiliary control
contact. (A contact that makes last and breaks first.) This contact should be wired to the battery positive on
the battery side of the connector and to Pin #2 of the terminal strip on the charger side of the connector. (The
jumper bar between Pins 1 and 2 must be removed when using the auxiliary control contact.)
An SCR regulator controls the charge rate so that the charger puts out near maximum output current up to the
gassing point of the battery, then automatically reduces the output current down to a trickle charge.
The charger provides automatic AC input line compensation. This eliminates the need for adjusting taps to
match the input line voltage. After the AC voltage taps are set, see INSTALLATION. The automatic
compensation also eliminates charging problems that arise from a varying input line when charging continually
or for two or three shift operations.
The unit is self-protecting when subjected to abnormal overloading conditions.
It should not be necessary to make any adjustments to this charger. Because of the stability of design, the unit
needs no periodic adjustment. This, along with the rugged construction and conservatively rated components,
insures long life and trouble-free operation.
Should any adjustments be necessary, a factory service representative should be contacted.
The automatic start/stop feature senses the connection of the battery and determines if it is in the proper
range, 1.4 volts per cell to 2.5 volts per cell, and then slowly ramps the output current up to start the charge.
If the discharged battery is not the correct number of cells or if the correct battery is over discharged the unit
will not start and the digital display will indicate number "0003". The charger will automatically turn off at the
end of the charge cycle.
An on/off switch is provided to de-energize the charger. Be sure to turn this switch off before disconnecting
the battery during the charge cycle. (After disconnecting the battery, place the on/off switch to the "ON"
position to activate the auto/start function.)
In the normal mode, the charger will charge the battery for 3 hours after the 80% point is reached (unless the
rate program terminates the charge first) or the battery is disconnected. In the equalize mode, a 6 hour timer
is initiated after the 80% point is reached.
A momentary equalize switch is provided so that equalizing may be selected to give a 6 hour charge after the
80% point is reached. Equalizing should be done periodically as recommended by battery manufacturer. This
switch, when activated, will start the equalize charge mode for that cycle only. After completion of the cycle,
the charger will automatically be reset to the "normal" mode.
When the 80% point is reached, the 80% charge lamp will flash at a one second rate. At this point, the timer
in the SCR is set for 3 or 6 hours depending on whether or not the equalize mode is active. The charger will
continue the trickle rate until the SCR control turns unit completely off. When a charging cycle is completed
correctly, the 80%/Complete light will be on solid until the battery is unplugged and the amp hours returned,
elapsed charging time and elapsed time from charge complete will be displayed. Unplugging a charged (charge
complete light "ON") battery will place the unit back in the autostart mode.
Disconnecting the output connector while a battery is being charged is not recommended. If the
battery is disconnected during a charge cycle, the control will turn off the charger, the complete light will not
light, all timers will reset, and the unit will go into the autostart mode.
If the battery never reaches the 80% charge point (due to battery failure), the unit will turn off in 12 hours
from the override timer. The complete light will not light. The "ON CHARGE" light will turn off, the "FAILURE"
PAGE 6 OF 13
Page 7
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
lamp will light and the display will indicate "0004." If this occurs, the unit will not autostart. The on/off switch
will have to be turned off to reset the lights and turned back on to initiate the autostart mode.
After starting, the SCR immediately activates the 12 hour override timer. This timer is independent of battery
conditions and overrides all other timing functions. The override timer will terminate the charge in the event
that the rate control or the 80% timing control does not terminate the charge before the maximum time limit of
12 hours is reached.
If the AC input line fails during the charge cycle, all internal time registers will hold their count until the power
returns. The "FAILURE" lamp will light if this condition is reached. The charge cycle will then resume from
where it left off and the failure light will turn off.
A high DC voltage feature is incorporated in the charge control system. If an unusually high voltage condition
as a result of a charger malfunction, the high voltage feature will terminate the charge cycle and turn on the
"FAILURE" light. A "0005" will indicate on the digital display. In this mode the charger will not restart again
unless the on/off switch is toggled to the "OFF" and then to the "ON" position. If the high voltage failure still
exists the charger will again turn off.
contacted.
At this point, a factory service representative should be
INSTALLATION
The LaMarche Model A75M charger is designed to operate on a specific type of battery with a specified number
of cells. The nameplate on the charger indicates the type and number of cells required. When connecting the
DC output 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 of the battery. A grounding
connection is also provided for complete protection. Once properly installed, the unit should automatically
complete its charge cycle every time it is connected to a discharged battery. Install the unit so that the flow of
air through the ventilators is vertical and not obstructed.
A terminal block is provided within the unit for the AC input connections. Before connecting the AC input cable,
check the line power with that specified on the nameplate of the unit. Units with multiple AC input units have
taps inside, which must be set for the proper AC setting. (See tap card inside door (BELOW)) The AC input
current specified on the nameplate is for rated output.
VOLTAGE CONTROL TAPS
480V 575V
CT H2 (B) H1 (B)
PT 2 (A) 3 (A)
Input AC breakers must be sized for the overload or current limiting point of the charger, which is 105% of the
rated nameplate value.
OPERATION
After the installation has been completed, the Model A75M is ready for operation. Be sure that the battery
charger is of the correct type for the battery that is to be charged. Select DC output current setting with the
"C" jumper to HIGH, MED, or LOW on the terminal block. (See A75M OUTPUT CURRENTS TABLE)
CAREFULLY READ AND ADHERE TO ALL BATTERY AND BATTERY CHARGER INSTRUCTIONS AND SAFETY WARNINGS.
To operate the charger, it is only necessary to place the on/off switch in the "ON" position and connect a
battery. With the on/off switch in the "ON" position and prior to the battery connection, all of the LED’s on the
front panel will flash until a battery is connected. This is the lamp test mode. When the battery is connected,
the "ON CHARGE" lamp will light and the digital display will indicate a slow increase in output current. The
charger will automatically start to charge the battery at some rate up to its maximum capacity depending upon
the state of charge of the battery.
PAGE 7 OF 13
Page 8
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
START-UP
A. Place the on/off switch to the "ON" position. Apply AC voltage to the units input terminals. Four (4) eight's
("8888") will flash on the display.
B. To select the equalize charge mode, activate the "EQUALIZE" switch on the front panel. If the equalize
mode is selected, the "EQUALIZE" LED will be on.
C. Connect the battery to the charger. After a 20 second delay, which assures proper battery connection, the
AC contactor should close and the on charge light should turn on. The battery charger should start to charge,
showing output amps on the digital display. This completes the "Autostart” sequence. If a battery with the
wrong number of cells is connected or the AC input line voltage is not present, the unit will not start and the
"FAILURE" light will be on. The digital display will indicate the cause of failure. This condition will also occur if
the battery being connected is discharged so deeply that the open terminal voltage will not come up to the 1.6
volts/cell required to initiate the start cycle.
NOTE: To disable this feature push the equalize button. Caution: Make sure a battery with the correct
number of cells is connected to the charger.
D. A75M can be programmed.
E. When the "80% CHARGE” point is reached in the charge cycle, the "80%/COMPLETE" light will flash. There
will be an additional 3 hours (6 hours in the equalize mode) of charge after this point is reached.
F. When the charge cycle is completed, the charge "80%/COMPLETE" light will turn on solid and the "ON
CHARGE" lamp will turn off. The display will also alternate at one second intervals between the "AMP HOURS",
"CHARGE TIME" and "COOLING TIME". The "COOLING TIME" is the time since the charge cycle completed and
is indicated in hours and minutes. When showing the "CHARGE TIME" the "AMP HOURS" light will be OFF and
the elapsed time LED will be ON. When showing the "COOLING TIME" the "AMP HOURS" light will be ON and
the elapsed time light will be ON.
G. If for some reason the AC input voltage fails, the "FAILURE” light will turn ON and the battery charger will
turn OFF. The display will indicate number "0001". During this interval, the time registers in the SCR are held
at their present count. When the AC has returned to normal, the charge cycle resumes where it left off and the
failure light turns off.
H. If for some reason the normal, equalize, or rate timers do not terminate the charge cycle in less than 12
hours, the override timer will time out, shut down the charger and turn on the "FAILURE" light. The display will
indicate number "0004".
I. If for some reason, the unit output voltage exceeds 2.7 v/c max for 20 sec, an independent software
shutdown will stop the charger. The display will indicate number "0005." In this condition, the lamps will not
update and the unit will not turn back on until the on/off switch has been toggled. The A75M will reset back to
the autostart mode when the battery is disconnected, or when the on/off switch is turned "OFF" and then "ON"
again.
J. If a fully charged battery is connected, the charger will turn off in fifteen (15) minutes and the Code 0007.
To bypass this function, push the equalize switch and the unit will charge the battery for up to six (6) additional
hours.
NOTE: TURN THE ON/OFF SWITCH TO THE OFF POSITION BEFORE DISCONNECTING THE
BATTERY DURING A CHARGE CYCLE. (After the battery is disconnected, return the on/off switch
to the "ON" position to activate the autostart function.)
PAGE 8 OF 13
Page 9
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
A75M TROUBLESHOOTING
INSTRUCTIONS
Before troubleshooting unit, check for shipping damage. (i.e. broken wires, loose connections, etc.)
Quick-Check A75M Trouble Analysis
Problem: Blown AC input fuse.
1. Check AC input voltage with tap setting on power transformer and control transformer. If AC input
and tap setting agree, see step #2.
2. Check AC input current draw after replacing blown AC fuse. NOTE: If AC fuse clears as soon as
the AC contactor pulls in, go to STEP #5. On three (3) phase units, if the AC current is not
approximately equal, check the AC voltage input to the S2A-123 printed circuit board. Connector
#1, 4-5, 5-6, 6-4 should be 100 Vac. - 220 Vac. If this voltage is not there, retrace the wiring back
to the SCR/Diode modules. If voltage is there, continue to step #3.
3. Check the AC voltage output on the S2A-123 printed circuit board, Connector #2, 4-1, 4-2, 4-3.
Voltages must be approximately equal and greater than 5 Vac. If it is not greater than 5 Vac.,
replace the S2A-123 printed circuit board.
4. Connect charger to discharged battery, check output voltage and voltage across charger shunt bar.
If output voltage is below 2.3 Vpc., the voltage across shunt must not exceed 135mV. If it is over
135mV, adjust pots on the S2A-320 printed circuit board counterclockwise which lowers the output
until 97mV across the shunt bar is indicated.
S2A-320 POT ADJUSTMENTS
P3 LOW START RATE*
P4 MID START RATE
P6 HIGH START RATE
P8 LOW FINISH RATE
P9 MID FINISH RATE
P10 HIGH FINISH RATE
P11 START/FINISH THRESHOLD VOLTAGE
P1 HIGH VOLTAGE CLAMP
Verify the jumper selection on the AC input terminal
block. If Low Start Rating is 101A and 250A/`100mV
shunt is used, Adjust P3 until 101A 100mV/250A =
40.4mV across the shunt bar is indicated.
5. If AC input fuse clears when the AC contactor pulls in make sure the correct AC fuses are being
used, time delay fuses. If the correct AC fuses are being used, disconnect P1 connector from the
FC6 printed circuit board.
6. Replace blown AC fuse, turn on AC power. (If fuse is good, defective S2A-320 or FC6 p.c. board.)
If fuse still clears, problem is a shorted SCR/Diode module or power transformer.
7. Separate secondary leads from P.T. to SCR/Diode modules. If fuse still clears, problem is in the
(P.T.) power transformer. If fuse is good, problem could be in the SCR/Diode module.
SEE SCR/DIODE TROUBLESHOOTING GUIDE.
PAGE 9 OF 13
Page 10
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
NOTE: Blown printed circuit boards, fuses or loose printed circuit boards fuses could cause an out of phase
condition. (Blowing AC input fuses) If a blown printed circuit board fuse is found, a wire on the gate lead of
the SCR/Diode module could be disconnected or a defective SCR/Diode module could exist.
Problem: Blown DC fuse.
1. Make sure the correct type of fuse is being used.
2. Check all connections to DC fuse to be certain they are tight.
3. Check polarity of output cables, output connector, SCR/Diodes module and diode SD4 for shorts.
Problem: Blown control transformer fuse CTF.
1. Defective contactor (shorted coil)
2. Control taps set wrong on control transformer H1 - H2.
3. Defective control transformer.
Problem: Control Transformer Fuses blown.
1. Defective S2A-320 Drive Board.
2. Shorted MOV. (Metal Oxide Varistor)
NOTE: Voltage across secondary of control transformer: X1 - X2 = 120Vac.
Problem: Complete "ON" but battery not charged.
1. Record all readings on digital display board before disconnecting battery. Check status of complete
light.
2. Check battery for defective cells.
3. Call local La Marche Representative or factory for additional information.
4. Possible settings on the S2A-320 control board.
Problem: Contactor does not pull in.
1. Check AC input voltage and fuses.
2. Check DC voltage at DC output terminals (battery connected).
3. Check AC voltage output on control transformer.
4. If 120 Vac. is present at AC contactor coil, contactor may be defective.
Problem: Failure light on CODE 0001 OR 0002.
1. Check AC input voltage must be present.
2. Check taps on power and control transformer.
3. Check AC contactor.
4. Check voltages on the secondary side of the control transformer.
5. Loose connections on the control transformer.
6. Check voltages on the S2A-243 transformer board.
PAGE 10 OF 13
Page 11
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
Problem: Failure light on CODE 0003.
1. Check battery for correct number of cells.
2. Check for defective or shorted cells in battery.
3. Open circuit battery voltage must be above 1.6Vpc..
Problem: Failure light on CODE 0004.
1. Check battery for defective or shorted cells.
2. S2A-320 or FC6 "p.c." board may be defective.
3. 80% setting came on late into the charge cycle, batteries are being discharged beyond
specifications.
Problem: Fuses, battery, AC voltage and taps okay, but no indication on display board.
Defective S2A-191 board, replace board.
TROUBLESHOOTING
SCR/DIODE MODULES A75M - 3 PHASE
1. Disconnect power transformer secondary wire from top connection of module.
2. Disconnect positive bus bar from module.
3. Disconnect negative bus bar from module.
4. Disconnect 6 wires from terminal P1 on FC6 Assembly.
MAGN-A-PAK Power Module Version:
5. Measure resistance from top terminal of module to center - terminal must read high resistance.
Reverse leads must read high resistance.
6. Measure resistance from top terminal of module to bottom - terminal must read high resistance one
way; low resistance when you reverse leads.
Hockey Puk Version:
5. Measure the resistance across the plates of SCR (where gate/cathode wires are attached). Each
should have high resistance on both directions.
6. Measure the resistance across the plates of diode. Each should have high resistance one way, low
resistance the other way.
PAGE 11 OF 13
Page 12
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
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 & control relays, they should be replaced every 7 years)
1. Check magnetics, components and wiring for signs of excessive heat.
PAGE 12 OF 13
Page 13
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
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 one year from date of purchase. In addition to the standard one (1) year warranty, La Marche warrants its
magnetics on a parts replacement basis only for four (4) more years under normal use.
Any part or parts of the equipment (except fuses, DC connectors and other wear-related items) that prove defective within
a one (1) 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. Magnetics are warranted for five
(5) years after date of purchase. During the last four (4) years of this five (5) year warranty period, the warranty covers
parts replacement only, and no labor or other services are provided by La Marche, nor is La Marche obligated to reimburse
the owner or any other person for work performed.
Should a piece of equipment require major component replacement or repair during the first year of the warranty period,
these can be handled in one of two ways:
1. The equipment can be returned to the La Marche factory to have the inspections, 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 year. Transportation charges or duties shall be
borne by purchaser.
2. If the purchaser elects not to return the equipment to the factory and wishes a factory service
representative to make adjustments and/or repairs at the equipment location, La Marche's field service
labor rates will apply. A purchase order to cover the labor and transportation cost is required prior to
the deployment of the service representative.
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.
PAGE 13 OF 13
Loading...