Bedienungsanleitung Graupner ULTRA DUO PLUS 50 (Seite 69 von 117) (Deutsch)

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- Batteries installed in a device, or which are electrically connected to other components.

• To avoid short-circuits between the banana plugs fitted to the charge leads, please always connect

the charge leads to the charger first, and only then to the battery to be charged. Reverse the

sequence when disconnecting.

• As a basic rule always check that the charge quantity is approximately the same as you expected

after

the charger has indicated that the pack is fully charged. This is a simple method of detecting a

problem reliably and in good time, should the charge process be terminated prematurely for any

reason. The likelihood of premature termination varies according to many factors, but is at its highest

with deep-discharged packs, low cell counts and particular cell types which are known to cause

problems.

• We recommend that you carry out a series of test charges to satisfy yourself that the automatic

termination circuit is working perfectly. This applies in particular when you are charging packs

consisting of a small number of cells. If the cells feature has a poorly defined voltage peak, the

charger may fail to detect the fully charged state.

• Before charging please check: have you selected the appropriate charge program for the battery?

Have you set the correct charge or discharge current? Have you set the important cut-off voltage

when charging Ni-Cd and Ni-MH packs? Are all connections firm, or is there an intermittent contact

at any point in the circuit? Please bear in mind that it can be dangerous to fast-charge batteries. 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.

• Be careful! A battery could explode or burn, if the charger does have a fault or if the user

does choose the wrong charging program and parameters.

A-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

manufacturer.

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).

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

positive terminal, black = negative terminal).

• 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

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