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programmable options to personalize the charge
profile.
The charger can be programmed to charge batteries
within a cell range of: 1 to 8 cells (models 12/201
and 12/501), or 1 to 18 cells (model 24/301) for gel
cell, liquid lead-acid, and valve-regulated batteries;
and a cell range of 1 to 12 cells (models 12/201 and
12/501) or 1 to 24 cells (model 24/301) for nickel
cadmium and nickel iron batteries. The charger has
a comprehensive self-checking diagnostic program
to monitor the quality of charge and check its own
safety conditions.
A three-digit display will show
charge data, the programmed charger settings, and
error codes. These values are useful to monitor and
correct problems, if needed, with the charging
system and with the battery.
3. THEORY OF OPERATION
When the charger is connected to the desired AC
voltage source (115 or 230), the transformer creates
auxiliary voltages for the electronic control module.
The electronic control module has a microprocessor,
which controls and monitors the charger so it will
perform properly. The transformer also supplies the
power output used for charging the batteries and
provides electrical isolation between the charger's
output and the AC source.
The charger's output current flows through a shunt
and is sensed by the electronic control module along
with the charger's output voltage. These values are
converted into drive pulses for the SCRs by the
control module.
This pulsating charge current (a
pulse occurs each time an SCR is on) is then filtered
by a large capacitor and the batteries to provide a
smooth output.
The charger is an "IE" profile which is (a) High rate
constant current, and (b) Constant voltage. When
the charger is first started, the SCRs will conduct for
a certain portion of the sinusoidal anode voltage to
provide the required charging current at the low level
of battery voltage. In this start region, a constant
current is applied to the battery.
conduction will then increase as the battery voltage
increases in order to provide a higher output voltage
while maintaining a constant charging current.
When the battery voltage reaches the float voltage,
the SCRs will start to decrease their output. This
causes the charger to automatically change from a
constant current charge region to a constant voltage
charge region.
As the batteries become fully
charged,
the
output
continuous constant float voltage will be supplied to
the batteries to maintain their charge.
The electronic control module also senses the
internal components of the charger for any change
in their performance. When an external temperature
www.nationalrailwaysupply.com
The SCR
current
decreases.
probe is not used, the charger's internal temperature
sensor
will
compensation (Functions 10 and 13).
REFERENCES TO FUNCTION NUMBERS ARE
FOUND UNDER ITEM 9.2.1.
temperature of the charger rises above 150 degrees
Fahrenheit (°F), the charger will reduce its output
current.
When the internal temperature reaches
165°F, the charger will stop until the temperature
drops below 165°F.
probe is used and its temperature rises to 130°F, the
output will be reduced.
reaches 135°F, the charger will stop until the
temperature is reduced. When an external probe is
not used, the charger will shut down earlier because
of the higher ambient temperature inside of the
charger.
4. RECEIVING AND INSTALLING THE
CHARGER
Proper installation of the charger is important in
order to achieve good charger performance and to
prevent damage to the charger and batteries. When
a charger is received, a check for possible in-transit
damage should be made. If any damage is found, it
should be reported as a claim to the carrier. To
permit free air flow for convention cooling, allow
three inches (3") minimum between the charger
sides and other equipment and four inches (4")
minimum on top of the charger.
WARNING:
PROGRAMMED
SPECIFICATIONS
CHARGE IS STARTED.
WARNING: NEVER PLACE ANYTHING ON
TOP OF THE CHARGER WHILE OPERATING.
DAMAGE TO THE CHARGER OR BATTERIES
COULD OCCUR.
5. AC ELECTRICAL SUPPLY
Depending on the model, the charger must be
connected to a single-phase, 60-100 Hertz AC
power source, which can be either 115 or 230 volts.
Use an 8 or 10 AWG wire (model 12/201), 6 AWG
wire (model 12/501), and 8 AWG wire (model
24/301) for the AC power input. Quarter-inch (¼")
ring terminals are required for proper connection to
the AC input and ground binding posts (A.A.R.).
A
Remove the small door cover on the front of the
charger by removing the two retaining screws. On
the panel behind the binding posts is a diagram
showing the proper jumper connections for the
different AC voltages.
2
be
used
for
the
If the internal
If an external temperature
If the probe temperature
THE CHARGER MUST BE
FOR
THE
PROPER
BEFORE
THE
temperature
ALL
USER
INITIAL
01434J
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