Manual Graupner ULTRA DUO PLUS 50 (page 70 of 117) (German)

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delivers.

• 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.

• A Ni-Cd 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,

preferably taking it to a toxic waste disposal centre.

• 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.

• A common cause of malfunctions is the use of unsuitable charge leads. Since the charger is

incapable

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 not be more than

30 cm long Good-quality connectors (gold-contact types) must be fitted to both ends.

• 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 prevents 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 ULTRA DUO PLUS 50 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 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. The

slightest 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.

When you set a particular current for charging, the charger only supplies that current if the value does

not exceed the unit’s technical capacity. If you set a charge current which the ULTRA DUO PLUS

50 cannot deliver because it falls outside its technical limits, the unit automatically reduces the current

to the maximum possible value.

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Graupner ULTRA DUO PLUS 50 Manual

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