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A75R General Description 

The La Marche model A75R uses proven SCR charging technology and is developed specifically for the railroad 

market.  It is typically used for signaling, highway crossing and motion detection systems where the battery is 

cycled  frequently.    This  filtered  unit  is  designed  and  built  to  charge  VRLA,  Flooded  Lead  Acid  and  Nickel 

Cadmium  batteries.    Some  of  the  features  that  make  this  product  unique  are  remote  shutdown,  lightning 

protection  and  charger  failure  contacts,  to  name  a  few.    Remote  shutdown  allows  you  to  place  the  charger 

offline  for  battery  testing  purposes.    The  A75R  is  equipped  with  AAR  style  hardware  on  the  input  and  output 

connections.  Temperature  compensation  is  included  standard  to  increase  the  longevity  of  the  batteries  and 

charger. The unit is convection cooled and the components are designed to achieve MTBF in excess of 100,000 

hours.  

 

Model Number

 

DC Output

 

AC Draw @ 100% Load

 

Dimensions

 

Weight 

Amps 

Volts 

LA Range 

NC Range 

lbs 

kg 

A75R-10-12V-AB1 

10 

12 

5-8 

8-12 

5.8 amps / 120 VAC 

12” x 10” x 9” 

34 

15.5 

2.9 amps / 240 VAC 

305 x 254 x 228mm 

A75R-20-12V-AB1 

20 

12 

5-8 

8-12 

8 amps / 120 VAC 

12” x 10” x 9” 

37 

16.8 

4 amps / 240 VAC 

305 x 254 x 228mm 

A75R-40-12V-AB1 

40 

12 

5-8 

8-12 

15 amps / 120 VAC 

14” x 12” x 12” 

58 

26.4 

8 amps / 240 VAC 

356 x 305 x 305mm 

A75R-30-24V-AB1 

30 

24 

10-16 

16-24 

22 amps / 120 VAC 

14” x 12” x 12” 

76 

34.5 

11 amps / 240 VAC 

356 x 305 x 305mm 

*A75R-60-12V-A1 

60 

12 

5-8 

8-12 

22 amps / 120 VAC 

16.7” x 12” x 12” 

80 

36.3 

427 x 305 x 305mm 

*

A75R-60-12V-B1 

60 

12 

5-8 

8-12 

11 amps / 240 VAC 

16.7” x 12” x 12” 

80 

36.3 

427 x 305 x 305mm 

A75R-60-12V-AB1 

60 

12 

5-8 

8-12 

22 amps / 120 VAC

 

16.7” x 12” x 12” 

80 

36.3 

11 amps / 240 VAC

 

427 x 305 x 305mm 

 SINGLE AC INPUT ONLY.  (120VAC OR 240VAC) 

Standard Features 

 

Microprocessor Controlled SCR Charging Technology 

 

Single Phase AC Input 120/240V, 50/60Hz  

 

Automatic AC Input Voltage Compensation ±10% 

 

Complete Isolation from AC to DC 

 

Lightning Protection 

 

Temperature Compensation with Enable/Disable Switch 

 

DC Analog Ammeter and Digital Voltmeter 

 

Adjustable Current Limit from 50% to 105% 

 

Filtered Output for VRLA Batteries 

 

Remote Shutdown 

 

Shared form “C” Contact for Charger Failure and Low Current Alarms 

 

Meets AREMA specifications 

 

Meets ANSI C62-41 

 

3-Year Warranty 

Содержание A75R

Страница 1: ...truction Drawing Number P25 LA75R 3 Tel 847 299 1188 Fax 847 299 3061 Revision A01 Rev Date 11 15 ECN 21002 La Marche Manufacturing Company www lamarchemfg com A75R A75R A75R A75R SCR Battery Charger for Railroad Version V 2 Installation and Operation Manual ...

Страница 2: ...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 r...

Страница 3: ...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...

Страница 4: ... Charger Overview 2 1 Installation 3 1 1 Mounting the A75R 3 1 2 Input Output Connections 4 1 3 Customer Connections 4 2 Operation 5 2 1 Initial Startup 5 2 2 Changing Settings 5 2 3 Adjustment Potentiometers 6 3 Status and Alarm Indicators 7 3 1 Charger Fail Alarm Operation 7 3 2 Low Current Alarm Operation 8 3 3 Remote Shutdown Operation 8 Quick Start Guide 9 General Maintenance Procedure 10 Man...

Страница 5: ... amps 120 VAC 12 x 10 x 9 34 15 5 2 9 amps 240 VAC 305 x 254 x 228mm A75R 20 12V AB1 20 12 5 8 8 12 8 amps 120 VAC 12 x 10 x 9 37 16 8 4 amps 240 VAC 305 x 254 x 228mm A75R 40 12V AB1 40 12 5 8 8 12 15 amps 120 VAC 14 x 12 x 12 58 26 4 8 amps 240 VAC 356 x 305 x 305mm A75R 30 24V AB1 30 24 10 16 16 24 22 amps 120 VAC 14 x 12 x 12 76 34 5 11 amps 240 VAC 356 x 305 x 305mm A75R 60 12V A1 60 12 5 8 8...

Страница 6: ...of contacts for remote annunciation The image below shows all points of customer interaction with the A75R charger 1 Input Output Power Connections Section 1 2 1A AC Input Neutral 1B AC Input Phase 1C Ground 1D Negative DC Output 1E Positive DC Output 2 AC Fuse 3 DC Breaker 4 Output DC Current 5 Output DC Volts 6 Customer Connections Signal 6A Remote Shutdown Input 12 24Vdc Bipolar Section 1 3 6B ...

Страница 7: ... keyholes Attach the bolts or screws into the wall lift the A75R onto the bolts and tighten Additionally the A75R has feet so it may simply be mounted on a floor shelf or table that is appropriately sized for the chargers weight Figure 2 85 Case Figure 3 88 Case All A75R Chargers 20A and lower are built in the 85 Case All A75R Chargers 30A and larger are built in the 88 Case Heatsink Installed onl...

Страница 8: ... DIP switch settings for DC output Section 2 2 Connect the DC output observe proper polarity DC negative connects to the terminal shown as 1D DC positive connects to 1E Connect the ground to the center ground terminal 1 3 Customer Connections The A75R include customer connections for Remote Charger Shutdown as well as a shared set of form C contacts for the Charger Fail and Low Current Alarms See ...

Страница 9: ...display is a set of twelve DIP switches These switches are used to change settings of the charger The function of each switch is shown in the image and table below Figure 6 Configuration Switches 12V Charger Switch Battery Cells 12V Voltage Range 12V Battery Cells 24V Voltage Range 24V SW1 Disable Low Current Alarm SW2 12NC 16 68 17 88 24NC 33 3 35 7 SW3 11NC 15 29 16 39 22NC 30 5 32 7 SW4 10NC 13...

Страница 10: ... Compensation will not function correctly 2 3 Adjustment Potentiometers There are two adjustment potentiometers for customer adjustment The Output Voltage Adjustment allows the customer to fine tune the output voltage Table 1 DIP Switch Settings on page 5 shows the approximate range for voltage adjustment The current limit adjustment allows the user to adjust the maximum limit for the charger outp...

Страница 11: ...he Nickel Cadmium battery type is selected Lead Acid This Yellow LED indicator illuminates to indicate that the Lead Acid battery type is selected Charger Failure LC Alarm This Red LED indicator illuminates to indicate rectifier failure It will blink when low output current is present 3 1 Charger Fail Alarm Operation The Charger Fail Alarm shares the LED indicator and the alarm relay contacts with...

Страница 12: ...m can be disabled by switching the SW1 DIP switch to the on position Disabling the Low Current Alarm will not affect the Charger Failure Alarm The Low Current Alarm and Charger Failure Alarm share the same set of Form C contacts The contacts will change state under either alarm condition 3 3 Remote Shutdown Operation The remote shutdown feature allows the user to check the battery without disconne...

Страница 13: ...9 Quick Start Guide ...

Страница 14: ... 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 capacitors 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 exces...

Страница 15: ...ce 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 consequentia...

Страница 16: ...12 Document Control and Revision History Part Number 133006 Instruction Number P25 LA75R 3 Issue ECN 20993 10 15 21002 11 15 ...

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