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www.nationalrailwaysupply.com 
1-800-357-3572 

39262A 

 

NATIONAL 
 

RAILWAY 

 

 

SUPPLY

 

 
 
 

Installing, Operating and 

Service Instructions for the 

ELC-24/30-D Solid State Charger

 

 

MODEL ELC-24/30-D  

BATTERY CHARGER 

 
 
 

PLEASE SAVE THESE IMPORTANT SAFETY AND OPERATING INSTRUCTIONS 

 

For correct operation of the equipment, it is important to read and be familiar 

with this entire manual before installing and operating the charger. 

DO NOT DISCARD THIS MANUAL AFTER READING. 

 

 

 

LOOK  FOR  THIS  SYMBOL  TO  POINT  OUT  SAFETY  PRECAUTIONS.    IT  MEANS: 

BECOME  ALERT

—YOUR  SAFETY  IS  INVOLVED.   

IF  YOU  DO  NOT  FOLLOW  THESE 

SAFETY INSTRUCTIONS, INJURY OR PROPERTY DAMAGE CAN OCCUR.

 

 

 
 

1.  IMPORTANT SAFETY INSTRUCTIONS

 

 

a.  Before using the battery charger, read all the 

instructions  and  caution  markings  on  the 
battery  charger,  the  battery,  and  all  of  the 
products using the battery. 

 

b.  Do not touch the uninsulated parts of the AC 

input  or  the  DC  wires,  the  charger's  binding 
posts,  or  the  battery  terminals  as  there  is  a 
possibility of electrical shock. 

 

c.  Batteries  produce  hydrogen  gas  while 

operating,  which  can  explode  if  ignited.  
Never  smoke, use  an  open  flame, or create 
sparks in the vicinity of the battery.  Ventilate 
the area well when the battery is charging in 
an enclosed area. 

 

d.  Batteries contain caustic material which may 

cause burns.  Do not get in eyes, on skin, or 
clothing.  If the gelled or liquid content of the 
batteries  contacts  the  skin or clothing, wash 
the  area  thoroughly  with  water.    In the  case 
of  contact  with  the  eyes,  flush  immediately 
with  clean  water  for  15  minutes  and  obtain 
medical attention. 

 

e.  Connect  or  disconnect  the  battery  plug  only 

when  the  charger  output  is  off  to  prevent 
arcing or burning. 

 

f. 

Only  qualified  personnel  should  program  or 
service this equipment. 

 

g.  De-energize 

all 

AC 

and 

DC 

power 

connections  before  servicing  this  unit.    If 
injury  does  occur,  apply  standard  treatment 
for electrical shock and, if necessary, consult 
with a physician. 

 

h.  The  charger  is  not  for  outdoor  use.    Do  not 

expose the charger to rain or snow. 

 

i. 

Do not operate the charger if it has received 
a  sharp  blow,  been  dropped,  or  otherwise 
damaged.    Take  it  to  a  qualified  service 
center. 

 

j. 

Do  not  disassemble  the  charger.    Have  the 
charger 

examined 

by 

NATIONAL 

RAILWAY  SUPPLY  service  agent.    If  the 
charger is assembled incorrectly, damage to 
the charger and the batteries or an electrical 
shock may result. 

 

2.  DESCRIPTION

 

The  NATIONAL  RAILWAY  SUPPLY  (NRS)  charger 
model  ELC-24/30-D  is  a  convection-cooled,  solid 
state,  SCR  regulated  charger  that  provides  either  a 
constant  current  or  constant  voltage  output.    The 
charger  can  be  set  to  charge  batteries  within  a 
voltage range of 20.0 to 35.0 volts for gel-cell, liquid 
lead-acid,  nickel  cadmium,  nickel  iron,  and  starved 
electrolytic batteries. 

 

Summary of Contents for ELC-24/30-D

Page 1: ...al which may cause burns Do not get in eyes on skin or clothing If the gelled or liquid content of the batteries contacts the skin or clothing wash the area thoroughly with water In the case of contact with the eyes flush immediately with clean water for 15 minutes and obtain medical attention e Connect or disconnect the battery plug only when the charger output is off to prevent arcing or burning...

Page 2: ...is not being used or the temperature probe is working improperly Temperature compensation uses a temperature reference of 77 F 25 C a voltage reference of 2 23 volts the voltage of a standard gel cell battery at 77 F and a compensation value of 3 0 mV per F or 5 4 mV per C The equivalent equation for the compensated voltage is Vcomp V k t 77 F Where V is the voltage of the battery at 77 F t is the...

Page 3: ...g flanges are configured for an EIA 19 483mm rack for a forward mounting arrangement note the width from the outer edge fo one mounting flange to the outer edge of the other mounting flange is 19 15 16 Fasteners to match the thread of the rack should be used in all 7 rack mounting horizontal slots on each of the 2 mounting flanges 14 rack mounting slots total to maximize the mounting integrity The...

Page 4: ... CAPACITOR 7 TEMPERATURE PROBE The external temperature probe is an optional way of extending battery life by using temperature compensation One end of the temperature probe cable has a three pin plug which plugs into a receptacle labeled TEMP PROBE on the front of the charger The other end of the cable has the temperature sensor sealed either in a terminal or small metal box WARNING IT IS IMPORTA...

Page 5: ...cessary e Check the polarity between DC output and the battery and make sure their connections are tight f Remove the small cover on the front of the charger and make sure all of the binding posts nuts are tight g If the steps above do not solve the problem contact your local NRS service agent at 1 800 357 3572 11 CHARGER SPECIFICATIONS AC INPUT VOLTAGE 115 VAC 108 128 or 230 VAC 216 256 AC INPUT ...

Page 6: ...SSEMBLY 15029S 2 FUSE 12 AMP 38888S 1 CIRCUIT BREAKER ASSEMBLY 31457S 1 AC SWITCH ASSEMBLY 27319S 1 AMMETER 50 AMP 14197S 4 BUSHING 1 29741S 1 TEMPERATURE TRANSDUCER 10 W TERMINAL 29742S 1 TEMPERATURE TRANSDUCER 30 W TERMINAL 14742S 1 HEATSINK ASSEMBLY W SCR 9 WIRE 15194S 1 HEATSINK ASSEMBLY W SCR 21 WIRE 23074S 1 SCR ASSEMBLY 50 AMP 21 WIRE 23073S 1 SCR ASSEMBLY 50 AMP 9 WIRE 15032S 2 OUTPUT CAPA...

Page 7: ...www nationalrailwaysupply com 1 800 357 3572 7 39262A 13 WIRING DIAGRAM ...

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