CTEK 1027, D250S User Manual

®

DC/DC Battery Charger

For lead-acid batteries

D250S

User Manual and Guide to professional

charging of starter and deep cycle batteries.

Мodel 1027

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 ve steps

with temperature compensation. Read this User Manual and follow the instructions carefully
before using your new charger.

SAFETY

• The charger is designed for 12V lead- acid batteries mounted into vehicles. Do not use the

charger for any other purpose

• Use safety glasses when connecting or disconnecting a battery.

• Batter y acid is corrosive. Rinse immediately with water if acid comes into contact with skin or
eyes. Seek medical advice.

• Make sure that the cables are not being pinched or in c ontact with warm surfaces or sharp

edges.

• While charging, a battery can emit explosive gases, avoid sparks in the immediate area.

• Always provide for proper ventilation during charging.

• Avoid cover ing the charger.

2

INSTALLING THE CHARGER IN THE VEHICLE

Install the charger on a surface where it can be properly xed and where the charger is not exposed

to fuels, oils or splashes of dirt. Mount the charger with screws intended for the sur face and at tach
it with one screw in each of the four holes in the corners of the charger. See picture 1. Mount the
charger with M4 or ST4.2 screws with maximum torque of 2Nm.

Supply source –

Supply source +

Max torque 2Nm

Picture 1

WARNING

Due to high r isk of shor t circuit, batteries should not be connected to power cords when installing

the charger.

Target battery –

Target battery +

M4 or ST4.2

Temperature

sensor

3

CONNECTING THE CHARGER

1. Identify the supply cords and connect the positive power cord to screw terminal marked with IN +

2. Identify the target battery cords and connect the positive power cord to screw terminal marked

with OUT +

3. Connect the negative power cords from supply and target battery to screw terminal marked with

IN - and OUT -.

4. Attach the temperature sensor to the target battery.

Note: Power screws should be fastened with torque 6–8Nm, see picture 2. Exceeding this recom-

mendation may severely damage the charger. Reverse polarity will damage the charger.

Correct torque 6–8Nm

Ring terminals eyelets
should be M8

Cord should be minimum
6mm² and maximum 1.0m long

Picture 2

BATTERY TYPES AND SETTINGS

D250S is intended for 12V WET, MF, AGM and most GEL lead-acid batteries. Please consult the
batter y manufacturer when in doubt.

TEMPERATURE COMPENSATION

D250S has a temperature sensor cable. The units will automatically adjust the charging voltage if
the temperature deviates from +25°C. A high temperature lowers the voltage and c old conditions
is handled by higher voltage. The temperature should be measured close to the battery, therefore

attach the sensor to the battery.

4

SPECIFICATION

Model 1027

Max supply voltage 22V DC
Integrated battery separator D250 starts when supply voltage is above 13.4V for 5 sec. D250 stops

Charging voltage 14.4V at +25°C

Max charging curren 20A
Current ripple* <1%

Ambient temperature -40°C – +70°C. Output power is automatically

Cooling Natural convection

Charger t ype Multi-step, fully automatic
Batter y types All types of 12V Lead Acid, WET, MF, AGM and most GEL bat teries
Batter y capacity 40– 500Ah
Protection class IP65

Weight 0.7 kg

*) The quality of the charging voltage and charging current are very important. High current ripple
heats the battery and ages the positive electrode. High voltage ripple can damage other equipment
connected to batteries. The battery chargers from CTEK produces very high quality voltage and

current with low ripple.

MAINTENANCE

The charger is maintenance-free. The charger must not be opened; doing so will invalidate the war­ranty. The charger casing can be cleaned using a damp cloth and mild cleaning agent.

Note: Disconnect supplying and target battery before cleaning the charger.

LIMITED WARRANTY

CTEK SWEDEN AB, Rostugnsv. 3, SE-776 70 VIKMANSHY TTAN, SWEDEN issues this limited

warrant y to the original purchaser of this product. This limited warranty is not transferable. The
warrant y applies to manufacturing faults and material defects for two years from the date of
purchase. The customer must return the product together with the receipt of purchase to the point

of purchase. This warranty is void if the batter y charger has been opened, handled carelessly
or repaired by anyone other than CTEK SWEDEN AB or its authorised representatives. CTEK
SWEDEN AB makes no warranty other than this limited warrant y and is not liable for any other
costs other than those mentioned above, i.e. no consequential damages. Moreover, CTEK

SWEDEN AB is not obligated to any other warranty other than this warranty.

when supply voltage is below 12.8V for 10 sec.

reduced at temperatures above +25°C

5

PROGRAM DESCRIPTION

Desulphation Soft Start Bulk

Revives a

sulphated battery

Current (A) Voltage (V)

PARAMETERS

The charger starts charging the target battery when the voltage of the supply source exceeds

13.4V for 5 sec. The charger stops charging the target battery when the voltage of the supply

drops below 12.8V for 10 sec.

Soft Start Bulk charge

Desulphation Soft Start Bulk

Desulphation with pulses
restores sulphated batteries.

Current is increased to 20A in
a controlled manner.

Main charge, where 80%
of the batteries capacity is
recovered. The charger deliv­ers maximum current until the

terminal voltage has risen to
the correct level. Bulk has a

maximum time, 8h, at which
point the charger automati­cally switches to Absorption.

6

Absorption Float Pulse

Peak charge with
minimal uid loss

Maintenance for

maximum performance

Absorption Float Pulse

14.4V until the current has
dropped to 0.4A or max 12h.
Enters Analysis mode when

nished.

Charging with constant

voltage

The state of charge varies

between 95% and 100%.

The battery receives a pulse
when the voltage drops.
This keeps the batter y in

trim when not in use.

Maintenance for

maximum service life

2001308 8B

7

CTEK SWEDEN AB

Rostugnsvägen 3, SE-776 70 VIKMANSHYTTAN, Sweden

Tel: [phone]

www.ctek.com