CTEK M 300 User Manual
M300
Battery Charger
For lead-acid batteries
User Manual and Guide to professional
charging of starter and deep cycle batteries.
EN
INTRODUCTION
Congratulations on purchasing your new CTEK professional switch mode battery charger. This charger is part of a range of
professional battery chargers from CTEK SWEDEN AB. It represents the latest technology in battery charging with charging and
analysis in eight steps with temperature compensation. Read this User Manual and follow the instructions carefully before using
your new charger.
SAFETY
• The charger is designed for lead-acid batteries. Do not use the charger for any other purpose
• Use safety glasses and turn your head away when connecting or disconnecting a battery.
• Battery acid is corosive. Rinse immediately with water if acid comes into contact with skin or eyes. Seek medical advice.
• Make sure that the cable is not being pinched or in contact with warm surfaces or sharp edges.
• While charging, a battery can emit explosive gases, so it is important to avoid sparks in the immediate area.
• Always provide for proper ventilation during charging.
• Avoid covering the charger.
• Make sure that the electrical cable does not come into contact with water.
• Never charge a frozen battery.
• Never charge a damaged battery.
• Do not place the charger on the battery while charging.
• The electrical connection must full the national heavy current requirements.
• Check the cabling in the charger before use. Make sure there are no cracks in the cabling or in the protective covering. A charger
with damaged cables may not be used.
• Always check that the charger has gone over to maintenance charging mode before leaving the charger unattended and connected
for long periods. If the charger had not gone over to maintenance charging within 3 days, this is an indication of a problem. In this
case the charger must be disconnected manually.
• All batteries fail sooner or later. A battery that fails during charging is normally taken care of by the chargers advanced control, but
certain uncommon errors in the battery can still arise. Don’t leave the battery charger unattended for a longer period of time.
• Only mount the charger on a at surface.
• This equipment may not be used by children or by those who can not read and understand the manual if they are not supervised by
a responsible person who can guarantee that the battery charger is being used in a safe manner. Store and use the battery charger
out of the reach of children. Make sure that children do not play with the battery charger.
• When using outdoors the charger has to be positioned horizontally with the long side or top side turned up.
CHARGING
Connecting the charger to a battery tted in a vehicle
1. The power cord should be disconnected when connecting or disconnecting the battery leads.
2. Identify the battery terminal that is grounded (connected to the chassis). The negative terminal is normally the grounded post.
3. Charging a negatively grounded battery. Connect the red cable to the positive terminal on the battery and the black cable to good
metal engine ground away from the battery. Ensure you do not connect the black cable to fuel lines or sheet-metal body parts.
4. Charging a positively grounded battery. Connect the black cable to the negative terminal on the battery and the red cable to good
metal engine ground away from the battery. Ensure you do not connect the black cable to fuel lines or sheet-metal body parts.
Connecting the charger to an out of vehicle battery:
1. The power cord should be disconnected when connecting or disconnecting the battery leads.
2. Connect the red cable to the positive terminal on the battery and the black cable to the negative terminal.
If the battery leads have been connected incorrectly, the reverse polarity protection system will ensure that neither the charger nor the
battery are damaged.
Start charging
1. Connect the charger´s AC cord to an AC Power Supply. The charger will indicate POWER, yellow indication lamp (B).
2. The lamp for completely discharged battery (1) will illuminate if the battery’s voltage is less than 12V.
3. Normal charging will be indicated by the following lights: completely discharged battery (1), bulk charging (2), absorption charging
(3) or maintenance charging (4). When the maintenance charging lamp illuminates the battery is fully charged. Charging will start if the
voltage drops. The charger can normally be connected for months. Reconditioning is indicated by the lamp (5) illuminating.
4. If the battery leads have been connected incorrectly, the reverse polarity protection system will ensure that neither the charger nor
the battery are damaged.
5. If nothing happens. If the lamp indicating the setting and the power lamp remain lit but no other lamp illuminates, the connection
to the battery or chassis may be poor or the battery may be faulty. Another cause may be a lack of voltage in the AC Power Supply.
Begin by improving the connection between the battery and charger.
6. Charging can be stopped at any time by disconnecting the charger’s AC cord. Always disconnect the AC cord before disconnecting
the battery leads. When you stop charging a battery installed in a vehicle you should always disconnect the battery lead from the
chassis before disconnecting the other battery lead.
2 • EN
BATTERY TYPES AND SETTINGS
M300 can easily be set for different types of batteries or conditions. The following recommendations should, however, only be seen as
guidelines. Please consult the battery manufacturer for further instructions.
Settings are made by pressing the “MODE-button “ and stepping forward one press at a time until the required mode is reached, the
button is then released. After about 2 seconds the charger activates the selected mode. The selected mode is saved in a memory in
the charger and remains there even if the charger is disconnected from battery and mains.
NORMAL
NIGHT
RECOND
NORMAL - Normal setting for wet batteries, maintenance free and for most Gel batteries. Some Gel batteries
prefer a slightly lower charging voltage. Please consult the battery manufacturer when in doubt.
NIGHT – This mode is equal to NORMAL, but with reduced current. The built-in fan is disabled and the unit is
almost silent. The Unit returns automatically to NORMAL after 8 hours. To ensure that the charger restarts in
NIGHT mode in the event of a power failure the setting is stored in a memory. The indication shows “NIGHT”
even if the charger has returned to NORMAL mode to remind that the charger will start in NIGHT mode next time.
RECOND - This mode is used to recover deep discharged ooded batteries where you could expect a stratied
acid (high acid weight in the bottom, low on top). Check with battery manufacturer when in doubt.
Use this mode with care, because the high voltage will cause some water loss. 16V is normally no problem
for electronics in 12V system. Consult your supplier when in doubt. Life of light bulbs will be reduced at higher
voltage. Try to disconnect light from the battery during this phase. Maximum effect and minimum risk for
electronics is achieved by charging a disconnected battery.
CHARGING PHASES
M300 charges and analyses in eight fully automatic steps. M300 has three different operating modes, see Battery Types and Settings.
The battery charger has an 8-step fully automatic charging cycle:
Desulphation
Desulphation with pulses recovers sulphated batteries. Indicates with lamp 1.
Soft start (Lamp 1)
Start mode for the charging cycle. The start phase continues until the battery’s terminal voltage has risen above the set limit, at which
point the charger switches to bulk charging. If the terminal voltage has not passed the voltage limit within the time limit, the charger
switches to fault mode (lamp 0) and discontinues the charging. If so, the battery is faulty or its capacity is too large.
Bulk (Lamp 2)
Main charge when 80% of charging takes place. The charger delivers maximum current until the terminal voltage has risen to the set
level. Bulk has a maximum time, at which point the charger automatically switches to Absorption.
Absorption (Lamp 3)
Complete charge up to virtually 100%. The terminal voltage is maintained at the set level. During this phase the current tapers
successively. Once the current has tapered to the set limit, this phase switches to being timed. If the total time for Absorption exceeds
the time limit the charger automatically switches to maintenance.
Analysis (Lamp 3)
Testing self-discharge. If self-discharge is too high, charging is discontinued and fault mode is indicated.
Maintenance charging - Float (Lamp 4)
Charging at constant voltage.
Maintenance charging - Pulse (Lamp 4)
Charging varies between 95% and 100% state of charge. The battery receives a pulse when the voltage drops and keeps the battery
in perfect condition when it is not in use. The charger can be connected for months at a time. The charger continuously measures the
terminal voltage to determine whether a charging pulse should be initiated. If the battery is loaded and/or the battery’s terminal voltage
drops the charger starts a charging pulse until the terminal voltage reaches the set level. The charging pulse is then discontinued and
the cycle is repeated innitely. If the terminal voltage drops below a lower limit, the charger automatically goes back to the beginning
of the charging curve.
Recond (Lamp 5)
This mode is used to recover deeply discharged ooded batteries. Recondition of deep discharged batteries. The voltage increases
with reduced current for a limited time period. The higher voltage starts some gassing and mixing of the acid, which is benecial for
both battery capacity and expected life. Note that the battery could emit explosive gas during Recond. Recond is performed between
Analysis and Maintenance.
EN • 3
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