Spektrum SPMAR9130T PowerSafe Bedienungsanleitung Seite 93

Battery Requirements
Using One Battery
The PowerSafe receiver allows the option of using one or two battery packs.
When using one battery, simply plug the battery into either one of the two battery
connectors (BATT 1 or BATT2). Be sure to secure the unused battery connector.
Ensure that the open contacts of the unused battery are not back powered (not
electrically hot), however, the unused connector should be secured to prevent it
from entangling during flight. When the system is powered using one battery, a
single blue LED will constantly emit when the system is powered on.
Using Two Batteries
The PowerSafe receiver offers a true redundant dual battery system. When
using two battery packs, each pack functions independently and is isolated from
the other so that if one pack should fail (open circuit, short-circuit, or become
discharged) the other battery will provide power to operate the system. When us-
ing dual batteries, it's important that both batteries be of the same capacity and
ideally of the same age and condition.
It's normal for one battery to discharge slightly more than the other. This is
the nature of a truly redundant isolated battery system. The battery that has
the higher voltage or lower internal resistance will discharge at a faster rate.
Generally the difference is negligible (less than 10%). Because of this it's normal
for only one blue LED (Batt 1 or Batt 2) to be on when the system is not under a
heavy current load depending on which pack is providing more power.
When using two batteries, the total available capacity equals the sum total of
both batteries e.g., BATT1 @ 2000mAh + BATT2 @ 2000mAh = a total capacity
of 4000mAh. 12- and 24-inch EC3™ battery extensions (SPMEXEC312,
SPMEXEC324) are available for installations where the battery is located a
distance from the main PowerSafe unit.
Using Dual Voltage Regulators
The Spektrum™ 7.5 am (11-amp peak) 6.0 volt regulator (SPMVR6007) is
specifically designed for use with the PowerSafe receivers.
IMPORTANT: When using two batteries powered through two regulators,
each regulator operates independently and it's common for one battery to
be discharged at a slightly higher rate depending on the condition of the
battery (internal resistance, voltage, etc.) and the tolerance of the regulators.
This causes one battery to discharge before the other and it's important to
check each battery using a loaded battery tester (HAN171) at a recom-
mended 1-amp load before each flight monitoring the voltage of each pack
and recharging when the weakest pack reaches 40% capacity. (See Battery
Capacity pg. 5)
Battery Capacity
It's important to select a battery(s) that has more than adequate capacity to
provide the necessary flight time. Our staff has been recording in-flight data
to determine typical current consumption of aircraft in flight. Following are two
graphs that illustrate the in-flight current draw of the radio system. Current draws
may vary depending on your servos, installation and flying style.
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