Manual Graupner Ultramat 17 (page 13 of 33) (English, German, French)

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3. General notes on using the charger

Charging batteries

When a battery is charged, a particular quantity of electrical energy is fed into it. The charge quantity is

calculated by multiplying charge current by charge time. The maximum permissible charge current

varies according to the battery type, and can be found in the information provided by the battery manu-

facturer.

It is only permissible to charge batteries at rates higher than the standard (slow) current if they are

expressly stated to be rapid-charge capable. The STANDARD CHARGE CURRENT is 1/10 (one tenth)

of the cells’ nominal capacity (e.g. for a 1.7 Ah pack the standard charge current is 170 mA).

ï Connect the battery to be charged to the charger output sockets using a suitable charge lead (red =

positive terminal, black = negative terminal).

ï Be sure to read the information provided by the battery manufacturer regarding charging methods,

and observe the recommended charge currents and charge times. Do not attempt to fast-charge

batteries unless they are expressly stated to be suitable for the high currents which this charger

delivers.

ï Please bear in mind that new batteries do not reach their full capacity until they have undergone

several charge / discharge cycles. You should also be aware that the charger may terminate the

charge process prematurely when connected to new packs, and batteries which have been deep-

discharged.

ï An NC pack will normally be warm at the end of a rapid-charge process, but if you notice that one cell

of the pack is much hotter than the others, this may well indicate a fault in that cell. Such packs could

fail completely without warning, and should not be used again. Dispose of the battery safely, prefe-

rably taking it to a toxic waste disposal centre.

ï Ensure that all connectors and terminal clamps make good, sound contact. For example, if there is a

brief interruption due to an intermittent contact, the result is inevitably a malfunction such as a restart

of the charge process, which would result in the pack being massively overcharged.

ï A common cause of malfunctions is the use of unsuitable charge leads. Since the charger is incapa-

ble of detecting the difference between a pack’s internal resistance, cable resistance and connector

transfer resistance, the first requirement if the charger is to work perfectly is that the charge lead

should be of adequate conductor cross-section and should be no longer than 30 cm. Good-quality

connectors (gold-contact types) must be fitted to both ends.

ï Charging transmitter batteries

A battery installed in a radio control transmitter can usually be recharged via the integral charge

socket which is fitted to the transmitter itself.

Transmitter charge sockets generally include a diode which prevents reverse current flow. This pre-

vents damage to the transmitter electronics should the charger be connected with reverse polarity, or

if a short-circuit occurs between the bare ends of the charge lead connectors. However, a transmitter

battery protected in this way can only be charged by the ULTRAMAT 25 if the diode is by-passed.

Please read your transmitter operating instructions for information on how to do this.

The stated maximum charge current for the transmitter battery must

never be exceeded.

To avoid possible damage to the internal transmitter components due to overheating and heat build-

up, we recommend that the transmitter battery should be removed from the transmitter’s battery

compartment prior to charging.

The transmitter must be set to “OFF” and left in that state for the whole period of the charge process.

Never switch a radio control transmitter on when it is still connected to the battery charger.

Any interruption in the charge process may allow the charge voltage to rise to the point where it

immediately ruins the transmitter.

Never attempt to carry out any battery discharge or battery maintenance programs via the transmitter’s

integral charge socket. The charge socket is

not suitable for this purpose.

ï When you set a particular current for charging or discharging, the charger only supplies that current

if the value does not exceed the unit’s technical capacity. If you set a charge / discharge current which

the ULTRAMAT 25 cannot deliver because it falls outside its technical limits, the unit automatically

reduces the current to the maximum possible value. In this case the screen displays the charge /

discharge current which is actually flowing, alternating with the warning message “MAX”.

Liability exclusion

As manufacturers, we at GRAUPNER are not in a position to ensure that you observe the correct

methods of operation when installing, using and maintaining this charger. For this reason we are obli-

ged to deny all liability for loss, damage or costs which are incurred due to the incompetent or incorrect

use and operation of our products, or which are connected with such operation in any way.

Japan

Order No. 3371

G2 (AMP/G2,5)

Order No. 3011

BEC

Order No. 3037

Order No. 3021

JR-transmitter

Order No. 3022

4. Recommended charge leads / polarity

The requirements made on rechargeable batteries vary greatly according to their particular applica-

tion, and this in turn calls for different types of battery connector. Please note that connectors,

connector names and polarities may vary from one manufacturer to another. For this reason we

recommend that you always use genuine matching connectors of identical construction.

The following charge leads are suitable for battery charging with this unit:

5. Controls / handling / charging start

Use only genuine charge leads fitted with cable of adequate conductor cross-section.

All charge leads should be cut down to a length of no more than 30 cm.

All the charger’s functions are controlled by means of just four buttons.

The -/DEC and +/INC buttons are used to change the current and voltage values. The function of the

other two buttons varies according to the presence or otherwise of a battery at the charge sockets:

Button Function

No battery PROGRAM/MODE Selects charge programs and sub-groups

connected: ENTER/START Selects the (charge) program group

Battery PROGRAM/MODE Ends the charge process, stops the buzzer

connected: ENTER/START Starts the charge process, changes within sub-groups

Car battery

terminal clips

Charge

sockets

Operating buttons

Connectors

for mains PSU

Coolin fins

Fan

Screen

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