Operating instructions for cedar auto 4a. How to use the Kedr charger? Model range of chargers: "Kedr-M"

The service life of the battery - the source of life of the car - ranges from 5 to 7 years. It all depends on the operating conditions. However, you can increase the battery life if you periodically recharge it and carry out special training. For these purposes, the Kedr charger was developed - one of the best in the entire Russian automotive market.

The operation of any battery is based on anode-cathode reactions that occur between lead cells and a sulfuric acid solution. As a result of the reduction of lead dioxide at the cathode, we obtain an electric current. However, over time, the course of the reactions weakens. It is then that it is necessary to connect “rectifiers” that restore the original elements.

Series of chargers "Cedar"

The main purpose of the Kedr series of domestic devices is to charge the battery and restore its functionality, lost due to the formation of lead sulfates and oxidation of the electrodes. In addition, the Kedr charger can be used to “train” the battery in order to improve its technical characteristics and extend its service life.

Externally, the devices in the series are a black plastic parallelepiped of fairly large mass. There is a control panel on the front side. The device has a cable for connecting to the AC mains, two clamps that are connected directly to the battery terminals. The device is configured for charging automatically.

The series of devices includes pre-starting devices that are used to start the engine of a car with a severely discharged battery (“Kedr-mini”). The assortment also includes universal units that perform both functions (Kedr-auto-10 charger).

Control Panel

Before starting the device, you must familiarize yourself with the rules of its operation. Neglecting this simple rule can cause electric shock and even death.

The most important thing is to study the control panel of the device before connecting it to the battery. In the vast majority of cases, it includes:

Switch for controlling automatic “Charge/Recharge” modes.
Fuse holder, in other words - fuse connector.
Toggle switch for automatic modes “Continuous/Cyclic”.
Ammeter and LED battery full charge indicator.

In the back wall of the device there is a small compartment containing the cords necessary to connect the Kedr charger to the power supply and the battery.

Differences between devices and other chargers

The Kedr family of devices is loved by domestic car enthusiasts for their ease of use.

The device recharges or restores the functionality of the battery thanks to the automatic functions built into its control board:

Cyclic operation - ensures partial restoration of the redox abilities of the electrodes during sulfation of elements.
Battery recharging - brings a constant charge to full capacity.
Battery shutdown mode after fully charged.

The device is also equipped with automatic protection against short circuits resulting from accidental contact of the output terminals or incorrect connection of the battery. When triggered, the protection system simply stops supplying electric current, thereby protecting both the Kedr charger itself and the battery.

Before charging

Before you start charging, you need to make sure that your battery needs recharging and is in good condition. To do this, you need to measure the voltage at the terminals. In winter, the maximum permissible discharge level is no more than 25% of the nominal value, and in summer - no more than 50%. If the voltmeter shows lower values, then the battery needs charging.

Standard car batteries have a nominal voltage of 12 Volts. Only in this case, the “Cedar” charger (instructions below) can charge the battery. Also read the battery data sheet to make sure this is true. Remember that in order to charge, the voltage in the charger must be higher than the battery voltage. Otherwise, nothing will work.

User manual

The instructions state that to charge the battery you must do the following:

Remove the cords from the cavity on the back wall, carefully stretch them on the floor, making sure that the clamps do not touch.
Connect the device to an alternating current source of 220 Volts.
Switch the toggle switches to the “Charge” and “Continuous” positions.
Observing polarity, attach the clamps to the battery terminals.

After this, charging of the battery will begin. As soon as the electrical capacity is completely restored, the Kedr charger will notify you of this with a red “End of charge” indicator. After this, the battery is ready for use.

Restoring functionality

A decrease in battery capacity occurs as a result of partial sulfation of the plates - the formation of sulfates on the electrodes. In this case, it is possible to increase the performance and durability of the battery. To do this you need:

Connect the device clamps to the terminals.
Move the toggle switch to the “Cyclic” position.
Connect a 12V or 6V light bulb to the battery.

Restoration of functionality occurs according to the following scheme: the Kedr charger charges the battery for 45 seconds, and then turns off, and the lamp comes into operation, which discharges the battery within 15 seconds. This cyclic charging/discharging increases the life and performance of the battery.

Modern minds and the latest technologies provide consumers with a huge range of devices that make life easier for users. The variety of technical assistants is constantly growing. Peripherals aimed at spending your time comfortably are also growing. There is an increasing need for more and more battery-powered devices, which make the use of electrical appliances more versatile.

How to use the Kedr charger? The type of charging equipment is thought out to the smallest detail, which makes it easier to use due to its versatility. "Cedar" is designed to charge 12-volt lead-acid batteries. The time it takes to charge depends entirely on how low the battery is. For desulfation (battery restoration), the “Cycle” mode is provided.

The operating capacity of this device is from 14 to 190 Ah. Ease of use extends the battery life. The principle is that the built-in board absolutely automatically looks for a rational option. And power wires are practically reduced to nothing. The silent operation of the Kedr charger, the compact dimensions of the device, light weight and the absence of gas and spark formation have a positive effect on the impression of its operation.

A number of features aimed at explaining how to use the Kedr charger. Thanks to the unique developments of Russian scientists, the Kedr charger has quite a few of the listed abilities. The charger’s peculiarity allows you to achieve maximum performance and the smallest deviation in current and voltage in the device.

If, while the charger is operating, the light suddenly goes out and the voltage drop does not exceed 100 volts, then charging will continue, thanks to the device’s memory device. The entire operation of the charger is controlled by a microprocess. After finishing the charging mode, the charger automatically switches to recharging mode.

In order to use this device, you must connect the terminals of the charger you are using to the terminals of the battery that requires charging, and the polarity must be strictly observed. If the polarity is not correct, the indicators will not blink. When you subsequently connect the power cord plug directly to a network with a voltage of approximately 220 V, the “Automatic” indicator should light up.

The charging process begins when the current indicator needle deviates from the charge current division by more than 4 A. When the device is plugged in, the battery is automatically charged. When charging is complete, the device in the “Automatic” mode will switch to a mode that uses recharging using low current. In this case, the “Automatic” indicator stops blinking. In order to carry out disulfation (recovery of the battery), use the “Cycle” mode.

When operating in this mode, it is necessary to connect a load with a current consumption of about 0.5 - 1 A to the battery terminals, for example, you can use a car light bulb, the power of which is about 6 - 12 V. When you press the "Cycle" button, the cycle will be carried out for 45 seconds. battery charge, and the indicator needle will fluctuate within 4 A. After the charging cycle is completed, the battery is discharged within 15 seconds.

Comments (17):

If you put the zener diode at 8.5V, will there be anything wrong? Will this affect the operation and characteristics of the device in any way?

#2 root June 14 2017

Victor, here are the parameters of the KS175Zh, which is installed in the circuit:

Minimum stabilization voltage 7.1 V;
Rated stabilization voltage - 7.5 V;
Maximum stabilization voltage - 7.9 V;
Zener diode stabilization current is 4 mA.

As you can see, the zener diode has some variation in the stabilization voltage: 7.1-7.9 V. It is used in the circuit to power the K176 series logic chips.
Most likely, replacing the KS175Zh with a zener diode with a voltage of 8.5V will not affect the operation of the charger in any way.

#3 Vladimir January 19 2018

Why is the circuit like this, but the printed circuit board is from a different circuit?
I can't find the printed circuit board diagram shown.

#4 root January 19 2018

Vladimir, the printed circuit board (Fig. 10) was developed for a circuit manufactured in 1991 (Fig. 7), and it is slightly different from the original factory board (Fig. 9). We have not yet seen a printed circuit board drawing for the circuit in Figure 3.

#5 Evgeniy February 11, 2018

There is a printed circuit board in Sprint-Layout-6. If you want, I can post it.

#6 root February 11 2018

Evgeniy, thank you for sharing your development! Printed circuit board for Kedr-Avto-4A (SprintLayout 6) - Download

#7 Vladimir July 25 2018

Is there an alternative to KU202G?

#8 root July 26, 2018

Foreign analogues of KU202 are BT138, VT151 (12A) in TO-220 housing.

#9 Arthur October 28 2018

How to add a manual mode for cedar auto 4A so that you can force charge with a current of 6A?

#10 Alex January 08 2019

I received a KEDR AUTO 12V for repair, I don’t know the year. I won’t speak for all CEDARs, just using this example as an example. The printed circuit board and wiring diagram correspond to Fig. 10. Schematic diagram - fully consistent with Fig. 7. Scheme Fig. 3 contains obvious errors; the connection of the DD4 - K176TM2 microcircuit is shown incorrectly. There, even for the DD4.2 part, the pins of the microcircuit are numbered incorrectly. In my copy, it was this particular microcircuit that failed, so I had to figure it out. Since it is shown in the diagram in Fig. 3, the node on the DD4 chip cannot work correctly. It would be better to remove it.... diagram in Fig. 3.

#11 root January 09 2019

Alex, thank you for your comments. Errors corrected. We checked the numbering of the pins of all microcircuits in Figure 3 - for element DD4.2 they swapped 12 with 13 and 10 with 11.

#12 Geory February 03 2019

Hello everyone! They gave me a 12V cedar in a faulty condition, the problem is in the trance. TPP3-2-220-50k I didn’t find anything on the current network (consists of 1 primary 1-2, and two secondary 5-6, and 4-3, I really need the resistance of the primary and secondary and output voltages. Thanks in advance.

#13 Pavel February 04 2019

Hello, What do R5 and R9 regulate? How can I limit the voltage to 14.8 V?

#14 Dmitry February 06 2019

Good day everyone! One person has already asked about an alternative to KU 202g. I'm not very good with radio and electrical equipment. One of the thyristors has failed. In the store, when purchasing, the “master sellers” assured that KU 202g and Ku 202zh were interchangeable (at that time KU 202g was not on sale). Yes, of course, after installing the KU 202zh the device works, but the automatic shutdown does not work when the battery is already fully charged.
You have to constantly keep watch so that overcharging does not happen and the plates in the battery do not fall off.
Maybe there is still an alternative to the KU 202g?

#15 root February 06 2019

Thyristors KU202G and KU202Zh have the same characteristics with the exception of the “Constant voltage in closed state” parameter, where it is equal to 50V and 10V, respectively.

The circuit is low-voltage and this parameter may not be so critical here; perhaps some other parts have failed. You need to check whether all transistors and diodes are working properly, study the operation of the device and check the microcircuits.

There is a tuning resistor R5 “End of charge” installed on the board (diagram in Figure 7), perhaps it was turned without understanding and the device is not configured to turn off the charge when a certain voltage level is reached on the batteries.

#16 ALEX February 11 2019

Hello. The cedar unit stopped working due to a break in the diodes in the circuit of thyristor control electrodes.
Replaced diodes and thyristors. Charging took place only in cyclic mode. When the automatic mode was turned on, the LED turned off, the ammeter showed a current of 2 A and turned off after a couple of seconds. I moved the R5 a little, the charge took a little longer. The battery tester /40A/ showed the charger turned on at 13.4 and turned off at 14.4, everything would have been fine good, but there was no fixed shutdown. The device turns on with the specified parameters and turns off until you disconnect it from the network. Please advise how it should be. Thank you in advance.

#17 alex March 14 2019

charging occurs in a cyclic mode. those. The ammeter needle deviates by 1 A and then drops again to 0 A. and so on with a frequency of approximately 50-60 Hz.

Everyone who has a car knows perfectly well where the colored parallelepiped is located, covered with colored stickers, and why it is needed, but few people think that the battery does not last forever, and it needs to be at least looked after. Only then will she be able to last the 5-7 years allotted to her. And if necessary, it needs to be charged. Moreover, it should be charged correctly, and now there are all conditions for this.

Charger Kedr Auto 4a

Among hundreds of thousands of charger models, many motorists prefer domestic chargers. Whether it’s the genetic force of habit, or commendable patriotism, the Kedr Auto 4a charger enjoys a certain popularity. Many people have difficulty repairing this device due to the fact that the circuit is lost, and it is not always possible to find the original one. We rummaged through our archives and dug up a diagram of the device, which we offer for study.

It has a simple architecture, and it’s quite easy to understand if you can distinguish a resistor from a canister. And if you can’t, we will try to explain what it is, why it is needed and how to use it.

When to use a charger

Chemistry is a delicate thing, and a battery consists entirely of chemical processes. We will not dive into the intricacies of chemistry, but will find out what concerns the average motorist, his battery, and the Kedr Auto 4a charger.

The battery should be fine. In winter and summer. But it has an acceptable degree of discharge, which is checked quite simply - using a hydrometer, if the battery design allows it, or by measuring the minimum voltage at the terminals. In the first case, we measure the density, in the second, the voltage directly. The permissible value of battery discharge in winter is 25% of the nominal value, and in summer - 50%. If the jar can maintain a voltage of 1.6 V for five seconds, then it is fully charged. If the voltage is 1.4 V, then the battery is 50% dead. all arithmetic.

It is necessary to recharge the battery, and if you chose Kedr Auto 4a, then it will completely cope with its task if it is in good condition. And the consequences of improper charging can be sad for the battery, so no matter how smart the device is, it needs to be monitored.

Description

Any rechargeable battery is charged from a source greater than the battery voltage, and this must be a direct current source. Therefore, the charger must convert alternating current into direct current, and at the output give us the voltage necessary for charging. The device does this perfectly. Here are its technical data:

capable of operating from a household network 220 V ± 11 V;
the nominal voltage of the battery it charges is 12 V;
minimum charge current - 4.0 A;
consumes no more than 85 W.

Designed for both charging and restoring batteries that have lost their charge for a number of reasons. A lot of factors can cause a voltage drop on the battery, but the most important is considered to be sulfation of the plates and their oxidation. Cedar is also intended for training charge-discharge cycles, restoring the battery’s ability to hold a charge.

Charging takes a certain amount of time, which depends on the capacity of the battery, the degree of wear of the plates, as well as the degree of discharge of the battery. Equipped with a simple microprocessor that controls all possible charging and operating modes of the device.

Functions

When the charger is connected with correct polarity, the device starts charging the battery automatically, which is indicated by the LED. In this mode, standard battery charging is carried out with a current of no more than 4 A with voltage control at the terminals. When the maximum charging voltage is reached, the device itself disconnects from the battery. This is indicated by a flashing LED.

To remove sulfation, you must use the “cycle” mode. In this mode, it is advisable to connect a parallel load to the battery, which consumes about 1 A of current. A 6 W car light bulb is suitable for this. If you don’t do this, the process will also be successful, but it will take a little longer. To completely eliminate sulfation, you must leave the battery connected to the device for 3-5 days.

The device also has a pre-start battery charging mode. In this case, charging occurs faster due to the fact that a high current rating is used - up to 10 A. The process lasts about five minutes. After this, the device automatically switches to “automatic” mode, and already limits the current to 4 A.

This is how Kedr Auto 4a works. Thanks to a simple circuit, any malfunction can be identified and eliminated, and the device lasts quite a long time. Keep an eye on the ammeter, and good luck on your journey!

The Kedr AUTO 4A charger is intended for charging and restoring the performance of 12-volt acid lead batteries, partially lost as a result of sulfation and oxidation of the electrodes, as well as training them through charge-discharge cycles in order to increase their resource, service life and storage.

The Kedr AUTO 4A device provides automatic shutdown when charging is complete in the “AUTOMATIC” mode. The device is equipped with a dial indicator (ammeter) and a light indicator, which: when the “AUTOMATIC” mode is turned on, does not light up; when the charge is complete in the “AUTOMATIC” mode - flashes; When the “CYCLE” mode is turned on, it glows evenly.

The KEDR-AUTO device provides an accelerated charging mode for a completely discharged (up to 10 V) battery at a compromise initial current value of 3 - 4 A. Moreover, after 1 - 2 hours (depending on the degree of battery discharge and network voltage), the value of the charging current decreases to a value of about 2 A and continues to decrease towards the end of the charge to 1 A or less. This mode eliminates significant heating of the battery during charging and reduces the charging time of a completely discharged battery to 3 - 6 hours.

Before you start using the device, you must study the rules for the care and use of rechargeable batteries.

General characteristics of the device
Model	Kedr-Auto 4A
Rated supply voltage, V	220
Network frequency, Hz	50
Rated voltage of the battery being charged, V	12
Charging current, A (max.)	4 A
Rated power consumption, W	85
Relative air humidity, no more	98% at 25°C
Atmospheric pressure, kPa	from 84 to 106
Dimensions	185x130x90
Equipment
Product	1 PC.
Passport	1 PC.
Instructions	1 PC.
Package	1 PC.
Suitable for batteries
Type of battery being charged
Chargeable battery capacity	30 - 75 A/h

SAFETY REQUIREMENTS

ATTENTION! Before working with the Kedr-auto charger, you must carefully study these operating instructions.

Be careful! The charger contains dangerous voltage.
Before replacing the fuse or carrying out repairs, disconnect the charger from the mains.
Do not use a homemade fuse; this may damage the device.
Do not charge batteries near stoves or radiators (at a distance of less than 1 meter).
The ventilation openings in the device casing must not be covered.

Prohibited:
- disassemble the device body and operate the charger with the top cover removed;
- operate the charger if the power cord is damaged;
- operate in conditions of high humidity, as well as in aggressive environments;
- operate the device near sources of open fire or other sources of thermal radiation;
- operate the charger with the ventilation holes closed. The battery charging process should be carried out in a well-ventilated area.

Preparation for work and work procedure

Before using the device, you must study the rules for the care and use of rechargeable batteries.
Open the cover on the back of the charger and remove the cords. Set the automatic switch to the “CHARGE” position.
The charge mode toggle switch “CONTINUOUS-CYCLIC” allows you to select battery charging modes.
If it is necessary to charge the battery, switch the charge mode toggle switch to the “CONTINUOUS” position.
If it is necessary to form or desulfate the plates, when the battery capacity decreases, switch the charge mode selection toggle switch to “CYCLIC”. Connect a load (12V 6 W light bulb) to the battery terminals.
Connect, observing polarity, the cord using clamps to the battery.
Electronic protection of the Kedr-M device from short circuits and incorrect polarity connections is designed in such a way that a charging current appears at the output only if a voltage source (battery) with a voltage of at least 10V is connected to the output terminals.
The light bulb connected to the terminals of the charger will not light up, since it is not a voltage source.

Operation in battery charging mode.

Switching between the operating modes of the device “CONTINUOUS-CYCLIC” and “CHARGE-RECHARGE” can be done while charging the battery without disconnecting it from the network.
Connect the 220 V power cord plug, and the process of charging the battery begins, as evidenced by the ammeter readings.
The charging current of a completely discharged battery at the beginning of charging can be 4 A or more; further in the charging process the current will decrease.
When the battery reaches full charge, the charger automatically turns off, as evidenced by the lighting of the “END OF CHARGE” LED.
Switch the automatic switch on in the “RECHARGE” mode and continue charging the battery. The battery is considered fully charged if the electrolyte density does not change for two hours during charging.
In cyclic charging mode, after every 45 seconds of charging, the battery is discharged for 15 seconds through a load (light bulb) connected to the battery.
In the “CYCLIC” or “RECHARGE” position, the automation is turned off.

Possible malfunctions and methods for eliminating them

Despite the fact that the charger is simple and reliable to use, in practice there are cases when consumers, due to improper use, cannot obtain the required charging current and mistakenly consider this to be a malfunction of the charger. These errors are summarized in the table.

Name of faults, external manifestation and additional symptoms	Probable Cause	Elimination method	Note
1. When connecting the charger to the battery, there is no charging current reading	1. The fuse has blown. 2. Poor contact between the output terminals “+” and “-” and the terminals of the battery. 3. The polarity is reversed when connecting the Charger-A to the AB terminals. 4. The output terminals “+” and “-” are connected to each other. 5. Short circuit in the battery or it is over-discharged (voltage on it is less than 4 V)	1. Replace the fuse. 2. Check the condition of the terminals. If necessary, clean them. 3. Check that the device and battery are connected correctly. 4. Open the clamps. 5*. Check the device and battery.	* In case of other faults, the memory must be repaired.
2. When connecting the charger to the battery, the ammeter needle shows more than 5 A.	1. The battery is faulty (one bank is short-circuited). 2. The network voltage is significantly higher than normal.	1. Disconnect the device, eliminate the battery or network fault.	* If the charger is working properly, the fault must be looked for in the battery being charged
3. The charger has turned off, but the battery is significantly undercharged.	1. Malfunction of the battery (sulfation of plates, density does not correspond to the norm, contamination, etc.)	1. Charge in the “Cyclic”, “Recharge” mode.	Test the charger with a known good battery.