C-25, C-35 and C-55 High-Power High-Frequency
Electronic Speed Controls w/BEC
The ElectriFly
™
line of High-Power ESC’s feature the
“Safe Start” system to prevent accidental motor starts by
disabling the motor circuitry until the throttle stick is
moved to full throttle, then to the “off” position.
Other features include BEC (Battery Elimination
Circuitry) which allows the motor battery to power the
receiver and servos. When the motor battery voltage is
reduced to a set voltage per cell, the low-voltage cut-off
circuitry stops the motor while continuing to supply
power to the receiver and servos. This eliminates the
need for and weight of a separate receiver battery. The
ElectriFly line of ESC’s comes with thermal protection
that reduces the throttle to 70% when the maximum
temperature is reached. These ESC’s can easily be
adjusted for use with NiCd/NiMH or Li-Po batteries.
These ESC’s function with brushed motors only!
C-25
Dimensions: 0.98" x 0.43" x 0.71"
[25 x 11 x 18mm]
Weight: 0.85oz. [24g]
Input Voltage: 6-10 cells NiCd/NiMH
2-3 cells Li-Po
Continuous Current: 25 amps
Max Rated Current: 35 amps
BEC Voltage: 5V / 1.5A
Low-Voltage Cutoff: 0.8 volts per cell NiCd/NiMH
2.75 volts per cell Li-Po
Battery Plug: Deans
®
Ultra Plug
Switching Frequency: 1.3 kHz
C-35
Dimensions: 1.30" x 0.43" x 0.71"
[33 x 11 x 18mm]
Weight: 1.08oz. [31g]
Input Voltage: 6-12 cells NiCd/NiMH
2-4 cells Li-Po
Continuous Current: 35 amps
Max Rated Current: 45 amps
BEC Voltage: 5V / 1.5A
Low-Voltage Cutoff: 0.8 volts per cell NiCd/NiMH
2.75 volts per cell Li-Po
Battery Plug: Deans Ultra Plug
Switching Frequency: 1.3 kHz
C-55
Dimensions: 1.42" x 0.43" x 0.71"
[33 x 11 x 18mm]
Weight: 1.22oz. [35g]
Input Voltage: 6-12 cells NiCd/NiMH
2-4 cells Li-Po
Continuous Current: 50 amps
Max Rated Current: 65 amps
BEC Voltage: 5V / 1.5A
Low-Voltage Cutoff: 0.8 volts per cell NiCd/NiMH
2.75 volts per cell Li-Po
Battery Plug: Deans Ultra Plug
Switching Frequency: 1.3 kHz
Read and follow these instructions carefully
before using.
• Do not operate the airplane on or near water. Never
allow water, moisture or any foreign material onto the
ESC’s PC board.
• Never use more cells then specified for the main
battery pack.
• The ceramic capacitors must be properly installed on
the motor to prevent radio interference.
• Always disconnect the motor battery from the ESC
when not in use.
• Always switch on the transmitter before switching on
the ESC.
• Use heat-shrink tubing to insulate any bare wires from
the motor battery to the ESC and from the ESC to the
motor to prevent a short circuit.
• Allow the ESC to cool before touching.
The receiver plug attached to the
speed control plugs directly into a
Futaba
®
“J” receiver. However, if you
are using an Airtronics “Z,” Hitec “S” or
JR receiver, you will need to slightly
modify the receiver plug on the ESC. To modify the plug,
use a hobby knife or wire cutter to carefully cut off the
alignment tab on the side of the receiver plug as shown.
STEP 1 THE RECEIVER PLUG
IMPORTANT PRECAUTIONS
SPECIFICATIONS
INTRODUCING THE ELECTRIFLY LINE OF
HIGH-POWER BRUSHED ESC’s
™
The white “signal wire” on the ESC receiver plug should be
in the same position in the receiver slot as the white wire
on Futaba, the blue wire on the new Airtronics “Z”
connector, the yellow wire on the Hitec “S” connector or the
orange wire on the JR connector. WARNING: This
connector is NOT directly compatible with the old Airtronics
connector style. Use an Airtronics Servo Adapter to
connect this ESC to the older style Airtronics radios.
NEVER ALLOW THE BARE RED (+) AND BLACK (-)
WIRES TO TOUCH ON ANY RECEIVER OR ESC, AS
PERMANENT DAMAGE WILL RESULT TO BOTH
ITEMS AND VOID ALL WARRANTIES.
Determine the best location for the ESC inside the
fuselage. The ESC should be in a position which allows
good airflow for proper cooling, and close enough so the
wires reach the motor. It is highly recommended to put
cooling air intake holes in the front of the fuselage and
exit holes towards the aft end.
IMPORTANT: When using the ESC’s with the maximum
number of cells and at the maximum current draw, the
ESC must have good air flow over it to keep it cool.
The best method to mount the ESC in the fuselage is
with Velcro
®
. If the ESC will be mounted on wood, first
saturate the wood with thin CA and
allow to dry. Cut a
1/4" x 1"
piece of Velcro (both hook and loop)
. Attach the
hook (hard) material to the inside of the fuselage. Clean
the side of the ESC with rubbing alcohol and attach the
loop (soft) material. The ESC on/off button should be
positioned in the battery compartment. Do not apply
Velcro to the top or bottom of the ESC’s. These are the
locations of the heat sinks and must not be covered.
Motors generate radio noise which can interfere with
your receiver and cause problems. Your ESC includes
two .10µF (104) and one .047µF (473) non-polarized,
ceramic capacitors.These capacitors must be used at all
times, and on every motor to help reduce the radio noise
generated by the motor and prevent possible damage to
the ESC.
• Cut a piece of heat-shrink tubing long enough to cover
one of the leads on both of the .10µF capacitors,
leaving approximately 1/4" of the lead exposed at
the bottom.
• Solder the 1/4" of exposed lead from one of the
capacitors to the positive brush terminal on the motor
end cap.
• Solder the 1/4" of exposed lead from the second
capacitor to the negative brush terminal on the motor
end cap.
• Solder the remaining leads from both capacitors to the
side of the motor
case.
• Cut two pieces of heat-shrink tubing long enough to
cover both leads on the .047µF capacitor, leaving
approximately 1/4" of the lead exposed at the bottom.
• Solder one of the leads to the positive brush terminal
and the other lead to the negative brush terminal.
• Solder the positive (+) lead from the ESC to the
positive brush terminal on the motor and the negative
(-) lead to the negative brush terminal on the motor.
Adjusting the transmitter is critical for proper ESC
operation. The transmitter throttle adjustments should be
set as follows:
1. Set the travel adjustment, ATV, EPA or ATL to 100%.
2. Set the throttle trim and sub trim to neutral or zero.
3. Set the throttle reversing switch to reverse on Futaba
transmitters and to normal on most other transmitters.
Before you begin this setup, remove the propeller from
the motor.Then plug the ESC into the throttle channel on
the receiver and adjust the transmitter.
BATTERY SETUP MODE
1. Switch on the transmitter. With the ESC off, press and
hold the on/off button for 4-5 seconds until the red
LED goes off. Then, release the button.
2. Pressing the button again will cause the blue light to
stay on or start flashing. To change settings, press the
button until the correct setting is obtained.
NiCd/NiMH: The blue light will be on.
2-cell Li-Po: The blue light will blink 2 times.
3-cell Li-Po: The blue light will blink 3 times.
4-cell Li-Po: The blue light will blink 4 times.
3. Once the battery type is set, press and hold the button
for 2-3 seconds until the red light comes on.
BRAKE SETUP
1. The factory brake default setting is “brake on.” To turn
the brake off, switch the transmitter on and set the
throttle stick to the brake position. Press the on/off
button on the ESC. The red and blue light should be
STEP 5 SPEED CONTROL SETUP
STEP 4 TRANSMITTER ADJUSTMENTS
STEP 3 INSTALL THE MOTOR CAPACITORS
STEP 2 MOUNTING THE SPEED CONTROL
2
on or flashing for Li-Po and the motor should beep
3 times.
2. Move the throttle stick to full power. The motor will beep 5
times. Wait 5 seconds and the motor will beep 7 times.
3. Move the throttle stick to the brake position.The motor
will beep 3 times. The ESC is now ready to operate.
4. To switch the brake on, repeat the process.
Once the battery type and brake are set, they do not
require resetting once the ESC has been switched off.
ESC OPERATION
1. Switch on the transmitter.
2. Move the throttle stick to the brake position (towards you).
3. Press the on/off button on the ESC and listen for the
3 beeps.
4. Move the throttle stick to full power (away from you)
and listen for the 5 (brake on) or 7 (brake off) beeps
indicating full throttle. Move the throttle stick back to
brake immediately.
5. Move the throttle stick back to the brake position.
6. The ESC is now ready to operate.
7. To switch the ESC off, press the button until the lights
go out.
IMPORTANT: If the speed control does not operate
properly after following the above set-up procedure,
switch the throttle reversing switch on transmitter and
repeat the speed control set-up.
As a safety precaution to prevent the motor from starting
when the ESC is first switched on, you will need to move
the throttle to full and back to brake every time the ESC
is switched on.
Note: Once you have finished flying you must disconnect
the battery. Even though the ESC is switched off it still draws
a slight amount of current and will completely drain the
battery over an extended amount of time.
Because electric motors generate electrical noise it is
critical to range test the airplane, with the motor on,
before flying. With the antenna collapsed and a helper
holding the airplane, operate the flight controls while
walking away from the airplane. You should be able to
get approximately 75' to 100' away before losing control
of the airplane. Next, check the range with the motor
running at half throttle. The range should be close to the
range you got with the motor off. If it is not, you may need
to move the receiver, receiver antenna servo leads or
speed control to a different location.
A separate receiver battery may be needed if high-power
servos are used. With a helper holding the airplane and
the motor running, move all the servos simultaneously. If
the servos slow down or stop, a separate receiver
battery should be used.
Installing A Separate Receiver Battery:
1. Remove the red wire from the ESC receiver plug. To
do this use a small flat bladed screwdriver to raise the
plastic tab holding the metal pin. Carefully pull the red
wire out of the receiver plug and insulate the pin with
heat-shrink tubing or electrical tape.
2. Plug the ESC into the throttle channel on the receiver.
3. Connect a separate receiver battery to a receiver
switch harness and plug this into the battery slot of the
receiver. In most electric planes a 300mAh receiver
battery will work well. If the ESC is used in an electric
sailplane a 600mAh receiver battery is recommended.
4. To operate the receiver, first switch on the switch
harness, then the ESC. Reverse the order to shut the
receiver off.
Problem: Motor and receiver do not work.
1.Make sure motor battery is charged.
2.The plug between the motor battery and ESC may not
be making contact.
3.Check that the ESC plug is correctly plugged into
the receiver.
4.Unplug the ESC from the receiver and plug a receiver
battery into the receiver. Does the radio work now? If it
does, the problem may be the ESC and
requires servicing.
Problem: The ESC runs but cannot be controlled.
1.Make sure the ESC is plugged into the correct slot in
the receiver.
2.Check that the transmitter is adjusted properly.
SPEED CONTROL WORKS (BUT OTHER
PROBLEMS EXIST)
Problem: Receiver glitches or stutters while motor
is running.
1.The three motor capacitors are not installed correctly
or have broken.
2.Receiver is mounted too close to the ESC.
3.The receiver antenna is routed too close to the motor
battery, ESC or wires.
4.The motor battery/ESC plugs do not fit tightly.
Problem: Motor slows down after only a few minutes
of running.
1.The prop on the motor may be too large, causing high
current draw and overheating the speed control. The
thermal protection is slowing the motor.
TROUBLESHOOTING GUIDE
SPEED CONTROL DOES NOT WORK
OPTIONAL RECEIVER BATTERY
STEP 6 RANGE TEST
3
2.The motor may be damaged (bent shaft, tight bearing
or shorted winding) causing high current draw.
3.The ESC may need more cooling air flowing over it.
Problem: Motor runs backwards.
1.The ESC is wired to the motor backwards.
Please Note: ESCs that operate normally when
received will be charged a minimum service fee and
return shipping charges. Before sending your ESC in for
service, it is important that you review the
“Troubleshooting Guide”
on this instruction sheet. The
ESC may appear to have failed when other problems
exist in the system – such as a
defective transmitter,
receiver or servo, or incorrect
adjustments/installation.
• Hobby dealers are not authorized to replace ESCs
thought to be defective.
• Do not cut the input wires or switch harness of the
ESC before sending it for service. A fee will be charged
for cut wires which must be replaced for testing.
Great Planes warrants this product to be free from
defects in materials and workmanship for a period of 180
days from the date of purchase. During that period, we
will repair or replace, at our option, any product that does
not meet these standards.You will be required to provide
proof of purchase date (receipt or invoice). If, during the
warranty period, your ESC shows defects caused by
abuse, misuse, or accident, it will be repaired or
replaced at our option, at a service charge not greater
than 50% of the current retail list price. Be sure to
include your daytime telephone number in case we need
to contact you about your repair. This warranty does not
cover components worn by use, application of reverse
voltage, cross connections, poor installation, subjection
of components to foreign materials, any alterations to
wires, or tampering. In no case shall
our liability exceed
the original cost of the product. Your warranty is voided
if:
• You apply reverse voltage to the ESC by connecting
the motor battery pack backwards or plugging the
motor wires into the motor battery pack.
• You allow any wires to become frayed which could
cause a short.
• You use more than the rated number of cells (1.2 volts
per cell) in the motor battery pack.
• You tamper with any of the electronic components.
• You allow water, moisture, or any other foreign material
onto the PC board.
Under no circumstances will the purchaser be entitled to
consequential or incidental damages. This warranty
gives you specific legal rights, and you may also have
other rights which vary from state to state. If you
attempt to disassemble or repair this unit yourself it
may void the warranty.
For service to your ElectriFly C-25, C-35, or C-55 ESC,
either in or out of warranty, send it post paid and
insured to:
Hobby Services
3002 N. Apollo Dr., Suite 1
Champaign, IL 61822
(217) 398-0007
E-Mail:
hobbyservices@hobbico.com
Internet Address:
www.electrifly.com
ElectriFly by Great Planes Triton™Peak Charger Imagine
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OTHER ITEMS AVAILABLE FOR GREAT PLANES
180 DAY LIMITED WARRANTY
SERVICE PROCEDURES
GPMZ0313 for GPMM2025/2035/2055Entire Contents © 2005
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