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www.nationalrailwaysupply.com 3 

01545J 

 

 
 

WARNING:  IMPROPER JUMPER 

CONNECTION MAY CAUSE SEVERE DAMAGE 
TO THE CHARGER AND THE BATTERY.

 

Configure the jumpers for your AC voltage source 
(refer to the jumper diagram above).  Place the AC 
ring terminals on the binding posts and tighten the 
post nuts. 

WARNING:  FAILURE TO PROPERLY 

CONNECT THE AC VOLTAGE CONDUCTORS 
COULD CAUSE SERIOUS DAMAGE TO THE 
CHARGER.  IMPROPER GROUNDING CAN 
RESULT IN THE RISK OF AN ELECTRIC SHOCK.  
DO NOT OPERATE THE CHARGER WITHOUT 
PROPER GROUNDING.

 

 

6. DC 

OUTPUT 

The DC output wires, 6 AWG or larger, are 
connected on the two right-most binding posts as 
labeled on the panel behind the binding posts 
(positive on the left and negative on the right).  The 
DC cables should have quarter-inch (¼") ring 
terminals for connecting them to the binding posts.  
Check to make sure the polarity of the DC output 
wires is the same as those connected to the battery.  
The charger will not operate in a reversed polarity 
condition.  

WHEN CONNECTING THE DC WIRES 

TO THE CHARGER WITH THE AC POWER 
DISCONNECTED, A SPARK MAY OCCUR.  

This is 

caused by the output capacitors being charged by 
the batteries.  If the DC polarity is reversed, a circuit 
breaker will protect the charger from internal 
damage.  Correct the reversed wires and push the 
circuit breaker button back in.  Replace the door 
cover on the front of the charger after tightening all of 
the binding post nuts. 

WARNING:  DO NOT TOUCH THE 

CHARGER'S TERMINALS OR AN ELECTRIC 
SHOCK COULD OCCUR.  A VOLTAGE IS 
PRESENT ON THE DC TERMINALS EVEN AFTER 

THE AC IS DISCONNECTED BECAUSE OF THE 
ENERGY STORED IN THE 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 IMPORTANT TO MOUNT 

THE TEMPERATURE PROBE ON THE 
BATTERIES FOR PROPER TEMPERATURE 
COMPENSATION.  IF THIS CANNOT BE DONE, 
LOCATE THE PROBE AS LOW AS POSSIBLE IN 
THE BUNGALOW OR CABINET. 

Terminal-Type Probe 

The terminal-type probe should be attached to the 
negative (-) battery post near the center of the battery 
pack.  If the threaded stud is long enough above the 
battery jumper nut, attach the probe with another nut.  
Torque this nut to proper speci-fications.  If the stud 
is too short, the nut holding the jumper wire will need 
to be removed.  Open or remove the load and 
charging circuits to the batteries.  Remove the nut 
holding the jumper and add the probe, then torque 
the nut to the proper specifications.  Then close or 
connect the load and charging circuits back to the 
batteries. 

Box-Type Probe 

The metal box has a high performance contact 
adhesive tape for attaching it to the battery.  To 
attach, clean a spot for the probe on the middle 
battery about three inches (3") down from the top of 
the battery.  Make sure the spot is free of all dirt and 
oil or the probe will not adhere properly.  For proper 
adhesion, the battery surface must be cleaned with 
isopropyl alcohol.  Ideal application temperature 
range is between 70 and 100

°

F.  Initial application to 

Summary of Contents for NRS-12

Page 1: ... 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 ...

Page 2: ...ng 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 temperatu...

Page 3: ...NALS EVEN AFTER THE AC IS DISCONNECTED BECAUSE OF THE ENERGY STORED IN THE 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 s...

Page 4: ...bers the output current will go to zero and the yellow charging LED will flash The charger does not have a power switch When the AC power is applied to the charger the DC output will start and the yellow LED will be on To turn off the charger disconnect the AC power source 9 MAINTENANCE The battery charger requires minimal maintenance It should be kept clean and all connections are to be periodica...

Page 5: ...DUCER 30 BOX W ADHESIVE 29741S 1 TEMP TRANSDUCER 10 W TERMINAL 29742S 1 TEMP TRANSDUCER 30 W TERMINAL 04401S 1 TRANSFORMER CAP 15032S 2 OUTPUT CAP 14897S 1 CIRCUIT BREAKER ASSEMBLY 22908S 1 COVER ASSEMBLY 14786S 2 DIODE ASSEMBLY 14484S 1 TERMINAL TAP STRIP 03837S 2 FUSEHOLDER ASSEMBLY 12717S 1 VARISTOR ASSEMBLY W CAP VR1 15028S 2 FUSE 14789S 1 TAP STRIP ASSEMBLY W I O STUDS 14759S 2 VARISTOR ASSEM...

Page 6: ...BREAKER CIRCUIT DETAIL CONNECTOR P1 1 2 3 WHT WHT SHUNT GND 8 BLK 7 6 5 4 3 2 1 BATTERY BATTERY BLK ORG A C A C YEL RED BRN BRN SCR SCR BLK BLK ELECTRONIC A J1 1 J1 7 J1 9 J1 8 J1 10 J1 11 J1 6 J1 5 J1 3 J1 12 J1 4 BLK ORANGE SHUNT YELLOW SHUNT BLACK BATTERY BROWN SCR BROWN SCR WHITE AC XFRMR 5 WHITE AC XFRMR 8 RED BATTERY J1 8 J1 9 J1 1 J1 10 J1 11 J1 6 J1 5 J1 7 TMP PROBE J1 3 J1 12 TEMP PROBE S...

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