Installation - Spektrum PowerSafe AR9140T User Manual

EN
Battery Voltage
IMPORTANT: D0 NOT use a 4-cell 4.8-volt battery to power the
PowerSafe receiver.
Four-cell 4.8-volt batteries do not provide enough voltage headroom (additional
margin needed) necessary to power the system when heavily loaded. Under load
the system voltage can drop below the voltage system's minimum operating
voltage threshold (3.5 volts) and cause loss of control.
The PowerSafe receiver is capable of handling voltages from 6.0 to 10.0 volts.
The voltage limitations are generally the servos. Most servos are compatible
with 5-cell 6-volt packs. Five-cell 6-volt NiMH packs have become the standard
for many giant-scale applications. There is no voltage regulation in the receiver.
Voltage in = voltage out.
Be aware that NiMH batteries have a tendency to false peak when being fast
charged. Be especially careful when using NiMH batteries that they are fully
charged and have not false peaked.
Many pilots are using 2-cell LiPo batteries to power their aircraft. LiPo batteries
offer greater capacity for their size and weight, and are easier to manage when
charging. Before using LiPo batteries, please check the voltage specifications
of your servos. Use of a voltage regulator, such as the Spektrum VR6007 (SP-
MVR6007), might be necessary.
When a battery is connected to the PowerSafe receiver, a low current drain of
less than 1mA occurs even when the switch is turned off. If the system is going
to be stored for any length of time, it's important that the battery(s) be discon-
nected from the PowerSafe receiver to prevent over discharge.

Installation

The PowerSafe receiver requires a minimum of one remote receiver to operate.
Two or three remote receivers are included and, in most cases, it is recommend-
ed that two or three receivers be used. Each receiver functions independently and
additional receivers (up to three) offer a more secure RF link in difficult environ-
ments. The added security of redundancy should a failure occur will outweigh the
slight additional penalties of cost and weight.
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