Manual Graupner Ultramat 12 (page 15 of 36) (English, German, French)

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Lithium manual program

The charger automatically sets the charge current of 1C based on this information.

When you connect the pack to the charger and start the charge process, the charge current

starts at 0.00 A and slowly rises to the set limit.However, please do not be surprised if the

charger does not reach the current you have set, because the charge program constantly

monitors the battery voltage in order to prevent the pack inflating, provided that the voltage of

the individual cells in the pack is the same.When the charger automatically reduces the charge

current, the screen displays the message „END“, alternating with the reduced charge current.

The fundamental rule is that Lithium-based batteries may ONLY be charged using

special chargers, and the charge program must be set up correctly in terms of final

charge voltage and capacity for the battery type in use. The charge process is

fundamentally different to that required for Ni-Cd or Ni-MH batteries, and is termed

a constant current / constant voltage method. The charge current required varies

according to the battery capacity, and is set automatically by the charger. Lithium

batteries are usually charged at the 1C rate (1C charge rate = half capacity as charge current. Example:

battery capacity 1500 mAh: 1C charge current = 1500 mA = 1.5 A). For this reason it is essential to set

the charger to the battery capacity instead of the charge current. When the battery on charge reaches

the specific final voltage which is appropriate to the battery type, the charger automatically reduces the

charge current in order to prevent the battery exceeding the final permissible voltage. If the battery

manufacturer states a charge current lower than the 1C rate, then the capacity (charge current) must be

reduced accordingly.

We recommend the use of the Micro Balancer, Order No. 6491, which ensures that your Lithium

batteries are charged optimally, and therefore increases their useful life.

Problems caused by mistreating batteries:

It is very dangerous to overcharge Lithium-Ion batteries, as they tend to react by gassing, overheating

and even exploding. If the final charge voltage of 4.1 V / cell (Lithium-Ion) or 4.2 V / cell (Lithium-Polymer

and Lithium-Manganese) is exceeded by more than 1%, the lithium ions in the cell start to change into

metallic lithium. This material reacts very violently with the water in the electrolyte, and this can result in

the cell exploding. On the other hand it is also important to avoid terminating the charge process before

the final charge voltage is reached, since this reduces the effective capacity of the Lithium-Ion cell

markedly. Stopping the charge at just 0.1 V under the threshold means a capacity loss of around 7%.

Lithium batteries must not be deep-discharged, as this leads to a rapid loss of capacity. This effect is

irreversible; it is absolutely vital to avoid discharging the batteries to below 2.5 V / cell.

Caution: the cell type, cell capacity and cell count set on the charger must always be correct for

the battery to be charged; if you make a mistake, the battery could explode! Never connect a

Lithium-based battery to the charger if it features an integral charge circuit! Always place your

Lithium batteries on a non-flammable surface for charging

This program charges the battery using the capacity

(charge current) which you set.

Before you initiate the actual program you must set the

capacity of the pack (and thus the

maximum charge

current - range 50 … 7000 mAh) using the INC / DEC

buttons.

___________ _____

LiPo manual

C:2500mAh

DECINC

Lithium discharge program

The purpose of this program is to determine the residual

capacity of a Lithium pack which has not been fully

discharged.

The program discharges the pack using the set discharge

current (0.10 ... 100 A, left of screen) down to the set final

discharge voltage (2.5 ... 37 V per cell, right of screen). It

is not possible to set a final discharge voltage below 2.5 V

per cell, otherwise the battery will suffer permanent

damage.

___________ _____

LiPo discharge

1.00A 2.5V/cell

DECINC

ENTER

INC

___________ _____

DEC

INC

DEC

INC

ENTER

DEC

INC

ENTER

Ni-MH discharge program

___________ _____

NiMH discharge

1.00A 4.8V

DECINC

DEC

INC

ENTER

13. Lithium programs

Ni-MH-Delta-Peak (-

∆∆

∆ Peak)

trigger voltage

It is possible to adjust the trigger voltage (in mV per cell!) of

the automatic termination circuit for Ni-MH batteries.

However, Ni-MH batteries have a less pronounced voltage

drop than Ni-Cd cells, and a practical range has proved to

be 5 ... 25 mV / cell. If the trigger voltage is set higher, there

is a danger of overcharging the battery; if set lower, there is

a danger of premature termination.

We recommend that you carry out a series of test charges

to establish the ideal trigger value for your batteries.

Ni-MH conditioning program

These programs are only suitable for charging and discharging Lithium-Ion batteries with a

voltage of 3.6 V / cell, and Lithium-Polymer and Lithium-Manganese batteries with a voltage of

3.7 V / cell. The outstanding feature of Lithium batteries is their much higher capacity compared

to other battery types. However, this important advantage is offset by the need to adopt different

handling strategies: they must be charged and discharged using specific methods, otherwise

they will be damaged, and can be dangerous. The directions in these instructions must be

observed at all times when handling these batteries. Specific information and safety notes will

also be found in the battery manufacturer’s technical information.

The typical purpose of this program is to determine the

residual capacity of a transmitter, receiver or drive battery,

or to discharge the pack to a defined level.

In this program the charger discharges the pack using the

set discharge current (0.10 ... 1.00 A, left of screen) until its

voltage falls to the set final discharge voltage (05 ... 16.8 V,

right of screen).

The set final discharge voltage should be a value of around

0.8 ... 1 V

per cell, in order to avoid the pack becoming

deep-discharged. Deep-discharging a pack runs the risk of

reversing individual cells, i.e. they exhibit reversed polarity.

This program is designed to optimise the capacity of a

battery, and balance the state of its cells.

At top right you can use the INC or DEC button to determine

whether the conditioning program is to start with a charge or

discharge cycle. After this you set the number of cycles

from 1 to 5 (e.g., if you set three cycles, the pack will be

charged and discharged three times). The program dis-

charges the battery using the set discharge current stated

on the right of the screen (0.10 ... 1.00 A), and then rech-

arges it using the charge current (0.1 ... 7.0 A) shown on

the left of the screen. The charge process is terminated

automatically in accordance with the values already set for

„Ni-MH Delta Peak cut-off voltage“. The method of reading

out the values for the individual cycles is described in the

section „Screen displays“.

___________ _____

NiMH delta-peak-

volt =10mV/cell

DECINC

charge time

current

voltage

NiMH cycle C>D 1

C:2.5A E:1.00A

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Graupner Ultramat 12 Manual

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