DV Power BAC25A User manual

Battery Charger BAC25A
M-B025CN-300-EN 1
BATTERY CHARGER BAC25A
Manual
Manual Version: M-B025CN-300-EN
This Manual refers to the firmware version 2.xx
Publishing date: 2016-03-22

Battery Charger BAC25A
M-B025CN-300-EN 2
Contents
1. Introduction.................................................................................................................................3
1.1 SAFETY INSTRUCTIONS ...............................................................................................................................3
1.1.1 Safety terms and symbols ..........................................................................................................3
1.1.2 Terms of Use ..............................................................................................................................3
1.1.3 Orderly Practices and Procedures..............................................................................................4
1.1.4 Device Maintenance ...................................................................................................................4
1.1.5 Operator Qualifications...............................................................................................................4
1.1.6 Safe Operating Procedures ........................................................................................................4
1.2 POWER SUPPLY....................................................................................................................................5
1.3 INTENDED USE......................................................................................................................................6
2 Description..............................................................................................................................7
2.1 FRONT PANEL COMPONENTS.................................................................................................................7
2.2. MAINS POWER AND PROTECTIVE EARTH CONNECTORS ..........................................................................9
3 Getting Started......................................................................................................................10
3.1 CONNECTING BAC25A TO TEST OBJECT.............................................................................................10
3.2 SETTING TEST PARAMETERS...............................................................................................................11
3.2.1 Mode menu...............................................................................................................................12
3.2.2 Limits menu...............................................................................................................................14
3.2.3 Set menu...................................................................................................................................15
3.3 CHARGING..........................................................................................................................................17
3.3.1 IU mode ....................................................................................................................................17
3.3.2 UU mode...................................................................................................................................20
3.3.3 Charging Parameters................................................................................................................22
3.3.4 Charging Rates.........................................................................................................................23
4. External Alarm Function............................................................................................................24
5 Alarm Messages........................................................................................................................25
5.1 ALARM MESSAGE "OVERVOLTAGE"......................................................................................................25
5.2 ALARM MESSAGE "UNDERVOLTAGE"....................................................................................................25
6 Error Messages.....................................................................................................................26
6.1 ERROR MESSAGE "VS POLARITY"........................................................................................................26
6.2 ERROR MESSAGE "POLARITY"..............................................................................................................26
6.3 ERROR MESSAGE "OVERCURRENT"......................................................................................................26
6.4 ERROR MESSAGE "OVERHEAT"............................................................................................................27
6.5 ERROR MESSAGE "MALFUNCTION".......................................................................................................27
6.6 ERROR MESSAGE "MAINS VOLTAGE <90V"..........................................................................................27
7 Customer Service.................................................................................................................. 28
8 Packing the Instrument for Shipment.....................................................................................29
9 Technical Data......................................................................................................................30
9.1 MAINS POWER SUPPLY .......................................................................................................................30
9.2 OUTPUT DATA.....................................................................................................................................30
9.3 ENVIRONMENTAL CONDITIONS.............................................................................................................30
9.4 DIMENSIONS AND WEIGHT...................................................................................................................30
9.5APPLICABLE STANDARDS.....................................................................................................................30
10 Accessories...........................................................................................................................31
Manufacturer Contact Information................................................................................................. 32

Battery Charger BAC25A
M-B025CN-300-EN 3
1. Introduction
The purpose of this Manual is to provide helpful instructions on how to use the BAC25A instrument
safely, properly and efficiently.
The following instructions will help the user to avoid unsafe situations, reduce maintenance costs
and will ensure the reliability and durability of the BAC25A instrument.
The BAC25A must be used in observance of all existing safety requirements and regulations
based on national / local standards for accident prevention and environmental protection. In
addition, the relevant international standards are listed in the “Technical Data” section of this
document.
1.1 Safety Instructions
Safety is the responsibility of the user. Before operating the BAC25A, please read the following
safety instructions carefully.
It is not recommended that the BAC25A is used (or even turned on) without careful observation of
the instructions listed in this Manual. The BAC25A should only be operated by trained and
authorized personnel.
1.1.1 Safety terms and symbols
Terms in the Manual. The following terms may appear in this Manual:
WARNING: Warning statements identify conditions or practices that could result in injury or loss
of life.
CAUTION: Caution statements identify conditions or practices that could result in damage to
this product or to other property.
Terms on the Device. The following warning terms used in this document may appear on the
device:
WARNING: indicates that potential hazard may occur.
CAUTION: indicates that potential damage may occur to the instrument or to the test object
connected to the instrument.
Symbol on the Product. The following symbol may appear on the device:
Refer to Protective
Manual Earth Terminal
1.1.2 Terms of Use
•The BAC25A shall be used only if it is in good technical condition. Its use shall be in
accordance to local safety and industrial regulations. Adequate precautions must be taken to
avoid any risks related to high voltages associated with this equipment and nearby objects.

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M-B025CN-300-EN 4
•The BAC25A is intended exclusively for the application purposes specified in the ”Intended
Use” section of this Manual. The manufacturer and distributors are not liable for any damage
resulting from wrong usage.
•The user bears responsibility in case of not following the instructions defined in this document.
•Do not remove protective casing of the BAC25A.
•All service and maintenance work must be performed by qualified personnel only.
1.1.3 Orderly Practices and Procedures
•The Manual shall always be available on the site where the BAC25A is used.
•Before using the BAC25A, all personnel (even personnel who only occasionally, or less
frequently, work with the BAC25A) assigned to operate the BAC25A should read this Manual.
•Do not make any modifications, extensions, or adaptations to the BAC25A.
•Use the BAC25A only with the original accessories provided by its manufacturer.
•Use the BAC25A and its original accessories for the device’s intended use only.
1.1.4 Device Maintenance
The device should be kept clean in order to prevent excessive cases of dust or other contaminants
affecting its operation. It should be cleaned with water/isopropyl alcohol after any dirt/contaminants
are noticed on its surfaces.
1.1.5 Operator Qualifications
•Testing with the BAC25A should only be carried out by authorized and qualified personnel.
•Personnel receiving training, instruction or education on the BAC25A should remain under the
constant supervision of an experienced operator while working with the test set and the test
object.
1.1.6 Safe Operating Procedures
•Hazardous voltages of up to 300V can occur inside the BAC25A. Therefore, it is not permitted
to remove the protective casing of the BAC25A.
•Hazardous voltages exist on the terminals of the BAC25A. Switch off and unplug the BAC25A
before touching the connections, particularly if a fault is suspected.
•Before putting the BAC25A into operation, check the test set for any visible damage.
•Do not operate the BAC25A under wet or moist conditions (condensation).
•Do not operate the BAC25A if explosive gas or vapors are present.
•When setting up the BAC25A, make sure that the air slots of the test set remain unobstructed.
•Removing the BAC25A protective casing will void the warranty. Any work inside the instrument
without prior authorization from DV Power will also void the warranty.

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M-B025CN-300-EN 5
•If the BAC25A seems to be malfunctioning, please contact the DV Power Support Team (refer
to the "Manufacturer Contact Information” section) after previously checking the “Error
Messages” section.
•First connect cables to the device and then to the test object, after the test is completed
disconnect the cables from the test object first and then from the device.
•Prior to connecting the BAC25A, ensure that the battery (object) to be tested is completely
disconnected and isolated from the line. Every terminal should be checked and verified before
connecting the BAC25A.
•Do not use the BAC25A without the extra protective ground cables supplied with the BAC25A.
It must never be operated in a non-grounded configuration as this may result in an electric
shock to the user or damage to the device. Always establish this connection first before
establishing any other connections and remove this connection last.
CAUTION
Never open the measuring circuit while the test is in progress as dangerous high
voltage may occur.
Never disconnect cables from the battery while the test is in progress. This can
cause excessive DC arc flash on external terminals.
1.2 Power Supply
•Supply the BAC25A from a power outlet which is equipped with protective ground.
•Besides supplying the BAC25A from phase –neutral (L1-N, A-N), it may also be supplied
phase to phase (e.g. L1-L2; A-B). However, the voltage must not exceed 264 V AC. Please
refer to the “Technical Data” section.
•The BAC25A should be positioned in such a way that it is possible to disconnect it from the
power supply safely at any moment.
WARNING / AVERTISSEMENT
This is a class A product. In a domestic environment this product may cause radio interference
in which case the user may be required to take adequate measures.
Il s'agit d'un produit de classe A. Dans un environnement domestique, ce produit peut
provoquer des interférences radio, auquel casl'utilisateur peut être amené à prendre des
mesures adéquates.

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M-B025CN-300-EN 6
1.3 Intended Use
The Battery charger Unit BAC25A is a stand-alone instrument designed for charging primarily
Lead-Acid and Ni-Cd batteries. BAC25A is intended to support the main charger in order to charge
battery much faster or to quickly recharge a battery following a discharge test. It is used for
charging batteries that serve as backup power supply in:
•Power plants
•Generator excitation systems
•Substations
•Protection and control systems
The BAC25A charges 10 –300 V battery systems using one single cable setup, with effective
currents of up to 25 A.

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M-B025CN-300-EN 7
2 Description
2.1 Front Panel Components
1. Display
Displays the settings during the device charging mode selection as well as the measured values
during and after charging operation.
2. Keyboard
Used to control the device.
•UP/DOWN buttons are used to navigate through the active menu and to set the charging
parameters.
•RIGHT button to navigate through the active menu.
•ENTER button to confirm selected charging parameters, language, time and date, as well as
to go to the next screen if no changes are needed in the active menu.
•STOP button to stop the charging process, to interrupt the alarm buzzer and to return to the
previous menu.

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M-B025CN-300-EN 8
•START button to start the charging process.
•SET button to enter the SETTINGS menu (alarm, language, and time & date settings).
•LIMITS button to go to LIMITS menu.
•MODE button to set the charging mode (MODE IU, MODE UU).
3. LED Indicators
Green LED
•Lights continuously when BAC25A is switched on.
•Flashes alternately with the red LED during the charging process.
Red LED
•Lights continuously (and the alarm buzzer is active) in case of an operational error.
•Lights continuously (and the alarm buzzer is active) when test is stopped.
•Flashes alternately with the green LED during the charging process.
4. Temperature Sensor
Temperature sensor channel provides the ambient temperature measurement and the float
charging voltage correction according to measured temperature values.
5. Interface
The USB PC interface enables firmware loading. A USB cable is provided as an accessory.
6. Alarm Overvoltage
Alarm overvoltage channel is used for connecting the BAC25A with an external ALARM buzzer. If
unexpected overvoltage occurs, the external alarm will be activated.
7. Alarm Undervoltage
Alarm under voltage channel provides connecting the BAC25A with an external ALARM buzzer. If
unexpected undervoltage occurs the external alarm will be activated.
8. Current and Voltage Terminals
The instrument is equipped with current and voltage test cable terminals.
CAUTION
Never open the charging circuit while the test is in progress as dangerous high
voltage may occur. Do not disconnect or make reconnection of any cables when
the test is in progress!

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M-B025CN-300-EN 9
2.2. Mains Power and Protective Earth Connectors
Ventilation
CAUTION
For safety reasons, connection to protective ground should be established as the
first one before any other connections and separated as the last one at the end of a
charging.
Protective earth connector
For protection against parasitic currents or voltages, the BAC25A
earth/ground connector should always be connected to protective
ground (PE). Only the originally provided cable should be used for
this purpose.
Mains power connector
Connects the BAC25A to the mains power supply with a power cord.
Power switch –Double pole switch
I- In this position, the BAC25A is connected to the mains power supply.
0 - In this position, the BAC25A is separated from the mains power supply.

Manual BAC25A
M-B025CN-300-EN 10
3 Getting Started
3.1 Connecting BAC25A to Test Object
Before the BAC25A has been connected to a test object (e.g. a battery), the following steps must
be taken:
•The battery should be examined for any visual damages or liquid leakage.
•The BAC25A itself should be properly grounded. The grounding screw, placed on the rear side
of the device, needs to be connected to the PE using a grounding cable.
NOTE:
Always connect current/sense cables to the BAC25A first and then to the battery
string / test object. When disconnecting, always disconnect the cables from the
battery string / test object first and then from the BAC25A.
The grounding wire PE should be disconnected last.
Not following these instructions may cause life-threatening situations.
Figure 3-1: Connecting the BAC25A to a test object
Thick red and black lines represent current cables which conducts charging energy. Current cables
are recommended and necessary accessory for conducting the charging test. Thinner lines
represent voltage sense (VS) cables. Voltage sense cables are optional accessory which provide
smoother voltage regulation during the charging process. By using the VS cables, the voltage drop
on current cables does not affect the voltage measurement accuracy during the test.
The red device terminal (red clamp) should be connected to the plus and the black terminal (black
clamp) to the minus battery terminal.
The current cables and voltage sense cables should be separated physically to minimize the
effects of any coupling between them. Any source of interference should be eliminated from the
working area if possible.

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M-B025CN-300-EN 11
To maximize the accuracy and measurement repeatability, make sure that all clamps have a good
connection to the test object and avoid any crossing between the measuring cables.
CAUTION
•For safety reasons, a connection between the device and a test object(s)
should be always established as described in this Manual.
•The measuring cables should not be connected / reconnected after the start of
the charging process.
•The measuring cables should not be disconnected before the charging
process is over.
•It is important to organize working area in order to avoid damaging cables. It
may cause life threatening situations.
3.2 Setting Test Parameters
After the BAC25A device is switched on, the initial message informing the user about name of the
device and installed firmware version is displayed, Figure 3-2.
Figure 3-2: The initial screen
After the initial screen is being displayed for several seconds, the BAC25A changes the display to
the main menu and the green LED lights up.
The BAC25A keeps the user’s settings and offers them as default. What charging menu will be
displayed depends on user settings in the previous test. In case there are no saved test results, or
after the firmware upgrade, the IU charging menu (Figure 3-3) will be displayed.
Figure 3-3: The IU menu
The BAC25A device can perform charging in two modes:
- Mode IU (Float charging) is a constant-current charging mode of a battery string,
- Mode UU (Boost charging) is a constant-voltage charging mode of a battery string.
Besides the stated charging modes, the device can also be used as a power supply unit.

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M-B025CN-300-EN 12
The requested charging / supplying mode can be selected in the MODE menu. The MODE button,
placed on the front panel of the instrument, should be pressed to enter the MODE menu.
3.2.1 Mode menu
After the MODE button is pressed, the display switches to the MODE menu, presented in Figure 3-
4.
Figure 3-4: The Mode menu
The MODE menu enables the user to select the appropriate charging menu: IU (by selecting Mode
IU)or UU (by selecting Mode UU).
The UP / DOWN buttons are used for navigation and ENTER for entering the chosen submenu.
The STOP button should be press to exit the Mode menu.
3.2.1.1 Mode IU
If the IU charging menu (Figure 3-5) is not displayed, the user can open the menu by selecting the
Mode IU in the Mode menu.
Figure 3-5: The IU menu
VOLTAGE parameter (Figure 3-5) represents the real-time voltage value of the connected battery.
The parameter is not user-changeable –value is detected automatically once the test cables are
connected to the test object.
The following parameters need to be set before charging is started:
•Charge U. Maximum charge voltage. Maximum value to be set is 300 V DC.
•Charge I. Value of the constant charging current. The maximum current value depends on a
selected charging voltage, but it does not exceed 25 A.
The BAC25A sets automatically the value of Charge U and Charge I parameters depending on the
battery voltage being measured. The Charge I current is set as maximum respecting the battery
voltage level. If the device is / remains connected to the battery charged in the previous test, the
same value of Charge U parameter as in the previous test will be set. However, if the BAC is
connected to a battery string of different nominal voltage comparing to the previous charging,

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M-B025CN-300-EN 13
Charge U parameter will be set on the value approximately 2% higher than the battery voltage
being measured.
The automatically set values are not obligatory for the charging and can be changed by the user.
NOTE:
In case of a mains power supply interruption, the charging will be postponed until
the supply is restored. As the power supply is restored, the charging continues with
the same parameters as defined by the user before the interruption.
Charging in the IU mode, known as Float charging, is a 2-step process. First step is charging the
battery with the constant, user-selectable, current. The process continues until the battery voltage
reaches the predefined Charge U voltage (or Float voltage). After the Charge U voltage is reached,
charging continues with constant voltage which equals to the Charge U voltage.
As soon as the battery reaches the Charge U voltage, the device switches to the constant voltage
charging and the charging current begins to decrease. Charging current decreases continuously
during the constant voltage (float voltage) charging. Charging is stopped when a preset minimum
current value, which indicates a full charge, has been reached.
Values of both parameters are set by pressing the UP / DOWN buttons. Pressing the RIGHT
button enables the user to navigate through the menu and to set values for each digit separately.
Once the parameters are selected, ENTER should be pressed to confirm the selection.
This charging mode is usually used for nickel-cadmium and nickel-metal hydride cells or batteries.
3.2.1.2 Mode UU
If a battery requires Boost charging, or constant voltage charging, Mode UU (Figure 3-6) should be
selected in the Mode menu.
Figure 3-6: The UU menu
VOLTAGE parameter (Figure 3-6) represents the real-time voltage value of the connected battery.
The parameter is not user-changeable –value is detected automatically once the test cables are
connected to the test object.
The following parameters need to be set before charging is started:
•Boost U. Boost charging is when the charger voltage level is raised to a level somewhat
higher than the float charge voltage in order to “equalize” the voltage levels of the individual
cells or achieve a quicker recharge.
•Float U. Float charging is the normal charging method where the battery is recharged and
maintained in a fully charged condition by “floating” the battery at a voltage level that will keep
the battery charged.

Manual BAC25A
M-B025CN-300-EN 14
•Boost I. Boost current represents the maximum current (current limit) value at which the
BAC25A will boost (equalize) the battery.
The BAC25A sets automatically the value of Boost U and Float U parameters depending on the
battery voltage being measured. If the device is / remains connected to the battery charged in the
previous test, same values of Boost U and Float U parameters as in the previous test will be set.
However, if the BAC is connected to a battery string of different nominal voltage comparing to the
previous charging, Boost U and Float U will be set on the value approximately 2% higher than the
battery voltage being measured.
The automatically set values are not obligatory for the charging and can be changed by the user.
NOTE:
In case of a mains power supply interruption, the charging will be postponed until
the supply is restored. As the power supply is restored, the charging continues with
the same parameters as defined by the user before the interruption.
Charging in the UU mode, known as Boost charging, is a 2-step process. The first step is constant
voltage charging until the battery reaches the preselected Boost U voltage. Maximum charging
current that can be generated during the boost charging is user-defined (Boost I) which protects
battery of being damaged of high current. Charging will not terminate if Boost I value is reached –it
will be continued with current not higher than Boost I, until Boost U voltage is reached. Once this
voltage is reached, the charger will source enough current to hold the voltage of the battery at this
constant voltage (hence, the reason it is called constant voltage charging). Otherwise, if the battery
current doesn’t reach the current limit, the charger will charge at the selected boost voltage and the
current will decrease over time.
3.2.2 Limits menu
Limits settings is displayed by pressing the LIMITS button on the device. After pressing the LIMITS
button the device switches to the following screen:
Figure 3-8: The Limits menu
It is not necessary to enable any limit for conducting a charging / supply test. However, defining
test limits make the charging more customized, helping to adjust the parameters to the object that
needs to be charged / supplied. The following parameters can be enabled in the LIMITS menu:
•Boost T. Total boost charging time when the BOOST charging process ends. The device
switches to the float charging mode as this time is reached. This limit is active only for
charging in the UU mode.
•STOP U: Battery voltage value which ends the charging process.

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M-B025CN-300-EN 15
•STOP I: The value of charging current which ends the charging process.
•STOP T: The period after the charging ends automatically.
The RIGHT button is used for navigation, and UP / DOWN buttons to set desired values.
NOTE:
Whether a limit is active during the charging test depends on a selected charging
mode. All four limits can be active only in UU mode, while the Boost T limit is not
active in the IU mode.
In order to activate the limits of BOOST T, STOP U, STOP I and/or STOP T (YES or NO) the
RIGHT button should be used to move the cursor to the position of the limit status, and using UP /
DOWN buttons to select YES or NO option (Figure 3-8).
The charging process will stop automatically if any of the following parameters reaches its pre-set
value: STOP U, STOP I and STOP T (Figure 3-9). However, when Boost T parameter is reached in
UU mode, the BAC25A will switch to Float charging without interrupting the test.
Figure 3-9: STOP messages
The ENTER button is used to confirm limit values after the parameters are enabled and set. After
pressing the ENTER button, the display switches to the main charging / supply menu (Figure 3-3,
3-5 or 3-7, depending on the previously selected mode).
NOTE:
The LIMITS button is active during the charging process. The user can change any
of the displayed parameters (Figure 3-8) without interrupting the test. To do so, the
LIMITS button should be pressed in order the LIMITS menu to be displayed. After
pressing the ENTER button, all modifications are accepted in real time and the test
continuous with respect to the new parameters.
3.2.3 Set menu
Pressing the SET button on the device the following screen appears on the display:

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M-B025CN-300-EN 16
Figure 3-10: The Settings menu
The UP and DOWN buttons are used for navigation and ENTER for entering the chosen submenu.
Alarm values are the first parameters to be set. After entering the SET ALARM submenu, the
instrument switches to the following screen:
Figure 3-11: The Alarm menu
There are two alarm parameters which values can be set by using the UP/DOWN buttons:
Overvoltage (indicating that the battery voltage is overcharged) and Undervoltage (indicating low
battery charge level).
The RIGHT button is used for navigation, and enables the user to set the value for each digit
separately. After setting the alarm values, it is necessary to set the status of ALARM (YES or NO).
Using the RIGHT button the cursor can be moved to the position of ALARM status, and using the
UP/DOWN buttons can be selected NO (as in Figure 3-11) or YES option.
All changes are accepted by pressing ENTER which switches the display to the main menu (Figure
3-3, 3-5 or 3-7, depending on the previously selected charging / supply mode).
NOTE:
The values of 145,0 V for Overvoltage and 125,0 V for Undervoltage limit are saved
as default. If the user changes the values of the default limits, the new limits will be
saved as default and be set automatically in the ALARM menu.
Limits will be restored to default ones in case of a firmware upgrade.
NOTE:
The ALARM menu is active during the charging process. The user can change any
of the alarms without interrupting the test. To do so, the SET button should be
pressed in order to be entered into the ALARM menu. After pressing the ENTER
button, all modifications are accepted and the test continuous with respect to the
new limit settings.
After entering the TIME & DATE submenu the instrument the following screen will be displayed:

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M-B025CN-300-EN 17
Figure 3-12: The Time and Date menu
The RIGHT button is used for navigation, and UP / DOWN buttons to set desired values of time
and date.
Date format can be changed by pressing UP / DOWN buttons when cursor is placed on the
FORMAT parameter. One of three date formats can be selected:
1. YYYY-MM-DD
2. DD-MM-YYYY
3. MM-DD-YYYY
All changes are accepted by pressing the ENTER button which switches the display to the main
menu (Figure 3-3, 3-5 or 3-7, depending on the previously selected charging / supply mode).
After entering the SET LANGUAGE submenu the following screen is displayed:
Figure 3-13: The Language menu
The active language can be changed by using UP / DOWN buttons. Pressing the ENTER button
the language change is confirmed and the display switches to the main menu (Figure 3-3, 3-5 or 3-
7, depending on the previously selected charging / supply mode).
3.3 Charging
After the charging / supply mode is selected and requested limits / alarms are set, the user can
start the charging / supply.
3.3.1 IU mode
Once the parameters are set in the main manu, ENTER should be pressed to confirm the selection
and Ready to charge screen will be displayed (Figure 3-14).

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M-B025CN-300-EN 18
Figure 3-14: The Ready to charge screen
Up to two enabled limits can be displayed on the Ready to charge screen for final, pre-test
verification. If the user needs to modify any limit settings before the charging is started, STOP
button should be pressed to exit the Ready to charge screen (which will enable the LIMITS button).
In case limit settings are satisfactory, charging can be initiated by pressing the START button.
Figure 3-15: The Charging screen
The Charging screen provides information on charging voltage, charging current and duration.
Green and red LEDs flash alternately during the charging process.
If the user decides to change the charging voltage value during the charging process, it can be
achieved by pressing the MODE button (Figure 3-16).
Figure 3-16: The Charging screen
Once the parameter is reset, the ENTER button should be pressed to display the Charging menu
(Figure 3-15).
Besides charging voltages, limit and alarm settings can be reset during the test. By pressing Limits
button, the Limits menu is displayed (Figure 3-17) enabling limit parameters reset. Changes are
confirmed by pressing ENTER and the display switches back to the Charging screen.
Figure 3-17: The Limits menu

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M-B025CN-300-EN 19
The alarm settings can be reset by pressing the SET button during the charging, which displays
the ALARM menu (Figure 3-18).
Figure 3-18: The Alarm menu
Changes are confirmed by pressing ENTER and the display switches back to the Charging screen.
If Overvoltage or Undervoltage value is reached, the buzzer is on and the appropriate message is
displayed (Figure 3-19). The charging is not interrupted in case alarm messages are displayed.
Figure 3-19: The alarm messages
The charging can be terminated in several ways:
- If a preselected limit is reached (STOP U, STOP I or STOP T),
- If the user presses the STOP button.
If a STOP U, STOP I or STOP T limit is reached and the charging is stopped, the corresponding
message is displayed while the buzzer is on. In case the user manually stop the test by pressing
the STOP button, the message Charging stopped is displayed and the buzzer is on (Figure 3-20).
In both cases, the user should press the STOP button to turn off the buzzer while the display will
switch to the main IU screen (Figure 3-3).
Figure 3-20: STOP messages

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M-B025CN-300-EN 20
3.3.2 UU mode
Once the parameters are set in the main manu, ENTER should be pressed to confirm the selection
and Ready to charge screen will be displayed (Figure 3-21).
Figure 3-21: The Ready to charge screen
Up to two enabled limits can be displayed on the Ready to charge screen for final, pre-test
verification. If the user needs to modify any limit settings before the charging is started, STOP
button should be pressed to exit the Ready to charge screen (which will enable the LIMITS button).
In case limits settings are satisfactory, charging can be initiated by pressing the START button.
Figure 3-22: The Charging screen
The Charging screen provides information on charging voltage, charging current and duration.
Green and red LEDs flash alternately during the charging process.
If the user decides to change a charge voltage during the charging process, it can be achieved by
pressing the MODE button (Figure 3-23).
Figure 3-23
Once Boost U and / or Float U parameter is reset, the ENTER button should be pressed to display
the Charging menu (Figure 3-22).
Besides charging voltages, limit and alarm settings can be also reset during the charging. By
pressing Limits button, the Limits menu is displayed (Figure 3-24) enabling limit parameters reset.
Changes are confirmed by pressing ENTER and the display switches back to the Charging screen.