CHARGING CAUTION:
Because there are two batteries that each connect to a
common point this creates a situation called “Common-
Ground” meaning the two battery’s grounds are
ALWAYS connected, even if you use a switch on each
battery. Virtually every charger on the market cannot
handle a Common-Ground situation. If you try to
charge both batteries at the same time (using either one
charger with multiple outputs or two chargers) you risk
damaging the batteries, the charger or both. This can
be dangerous with Li-poly batteries. To charge both
batteries at the same time, the circuit must be broken to
break the Common-Ground.
Servo Power LEDs
The servo power LEDs are next to the XT-30 connectors and indicate
power is present on that connector. These do not indicate the voltage
input is above the minimum required.
Receiver Power LEDs
The receiver power LEDs show the receiver is getting voltage greater
than 4.75V. If the receiver regulator output voltage drops below 4.75
volts the LEDs will go out. There are two possible causes of the
receiver voltage going below 4.75 volts. First the load the receiver is
presenting to the regulator is greater than one amp causing the regulator
output to droop. This could be caused by directly plugging something
into the receiver that is overloading the circuit. The second cause of
the receiver regulator going below 4.75 volts is the input voltage to the
receiver regulator has dropped below 5.10 volts. This means the input
voltage on the XT-30 connectors is probably below 5.45 volts for some
reason.
Optional Failsafe-switch
The PowerExpander Sport supports the addition of a failsafe switch
(optional package). When using the failsafe-switch, the switch lead is
plugged into the input marked “Sw” near the top right of the servo
connections as shown on the reference drawing.
Smart-Fly can supply two types of failsafe switches. First is the
standard slide switch that most people are familiar with. This is a small
slide switch with out a charge jack. The second failsafe-switch is the
Pin & Flag switch, where a pin, with a flag on it, is inserted into the
switch to turn the system off. To fly, the pin is pulled out of the switch.
The advantage of the Pin & Flag switch is that the system cannot
accidentally be turned off, as can be the case with a slide switch. The
failsafe switch lead can be extended using a standard Futaba extension.
The PowerExpander Sport also supports charging the batteries through
the two charge connections denoted by the “C”, one on the top of each
servo output rail as shown on the reference drawing.
The charge jacks on the PowerExpander Sport can also be used to
connect to a battery meter. One thing to keep in mind when using a
battery meter and the failsafe-switch is that the jacks are not switched
off when the unit is off so the battery meter will continue to draw
power even when the unit is turned off.
Additional information and technical help can be found at
www.Smart-Fly.com
Quest Engineering & Development, Inc.
6125 South Ash Avenue, Suite B-8
Tempe, AZ 85283
Ph: (480) 460-2652 Fax: (480) 460-2653
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Thank you for purchasing the Smart-Fly
PowerExpander Sport!
This manual takes you through the installation and operation of the
Smart-Fly PowerExpander Sport. The features of the PowerExpander
Sport are:
•
For up to 60cc 3D or up to 75cc IMAC or Scale
•
Light weight, 1.4oz, 54g
•
Compact design, footprint is 2.6” x 3.5”
•
Battery input voltage up to 8.4V
•
Inputs protect against cell failure or power shorts
•
Filtered and regulated 5.0V power to the receiver
•
LED power indicators for input and receiver power
•
Fully buffered outputs on all channels
•
Full filtration of all signals in and out of the unit
•
Can be used with optional failsafe switch
