General Technical Characteristics - GRAUPNER PRX-5A Notice D'utilisation

PRX-5A
Power for Receiver

General technical characteristics

Installing the PRX in your receiving system enables you to use batteries such as two-cell LiPo
/ LiFe packs to power your receiver (check the manufacturer's maximum permissible operating
voltage for the receiver and the servos connected to it). The net result is that the PRX allows
you to exploit all the advantages of the new-technology battery types. A stabilised voltage is
fed to the servos and receiver, allowing them to develop their full performance. If the batteries
are not "up to the task" and produce momentary voltage collapses, these events are stored and
displayed subsequently.
- The possibility of connecting two identical batteries provides a level of redundancy, i.e.
enhanced security, as the system will continue to work if one of the batteries should fail.
Two batteries also increase the capacity and thus safe flight times, as both packs are
discharged simultaneously (battery backer mode). The PRX also includes duplicated
battery switching circuits.
- Three levels of output voltage can be selected on the PRX using a rotary switch; if
necessary, the voltage can even be changed when the system is in use.
Any of the values 5.1 V | 5.5 V | 5.9 V can be selected, according to your particular 5.1 V | 5.5 V | 5.9 V can be selected, according to your particular
5.1 V | 5.5 V | 5.9 V
application and personal preference. No matter what voltage the batteries produce, the
receiver and servos are fed a stabilised voltage in order to produce their best possible
performance at an absolutely constant level, regardless of the state of charge of the battery
or batteries.
Under certain circumstances the effective life of your servos can even be increased, since
they are never operated on an excessive voltage (e.g. fully charged five-cell NiMH battery).
- Two-cell LiPo
Two-cell LiFe
Two-cell LiIon
Five-cell NiMH / NiCd and six-cell NiMH / NiCd batteries can be used. Please
note: when two batteries are connected to the unit, they must always be of the same type!
The battery type must be selected using the rotary switch before the PRX is switched on.
- The power supply to the receiver is also duplicated (two leads), as this also represents a
level of redundancy as well as halving the current borne by each cable.
- Each of the two batteries is assigned one two-colour ultra-bright LED; these are very easy
to see. Their purpose is to display operating and warning states unambiguously to the user.
- The unit is switched On and Off using a high-quality rocker switching contact wired in
parallel with an electronic switching circuit. Once the PRX is switched on, it can only be
switched off by a mechanically defined action. If the switch itself should develop a fault, the
PRX remains switched on until the user explicitly switches it off.
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