Grayson Hobby
Grayson Hobby
Manual for 30A
Brushless ESC
Basic Features:
Voltage Range:4V-12V
2-3 lipo,
Internal Resistance:0.0025ohm
Lipo LVC 75% of initial startup voltage
Size: 45x24x9mm
Continuous working current:30A
Burst: 40A (10 Seconds Max)
Temperature-protection:100 Celsius
11. PWM: 8K
12. Max RPM 20,000 with Outrunner motors
The 30A ESC can be used with 4-10
NiCd/MiMh or 2-3 cell Lipo batteries and will
automatically detect them. The BEC is
functional with up to 3 Lipo cells. The only
programmable feature on this ESC is the brake.
The brake defaults to OFF. If you don’t need to
program the brake function, your ESC is plug
and play and ready for use up to 3 cell Lipo or
10cell NiCd/NiMh.
CAUTION: Secure the aircraft and stay clear of
the propeller attached will damage the motor.
CAUTION: Running the motor at high RPM
without a propeller attached will damage the
Connecting the Motor:
Note the wiring diagram below:
Additional Features:
1. Soft start
2. Start disabled if the throttle is in the wrong
3. Auto detect of the throttle
4. Auto shut down of the power if the signal is
5. Auto calibration of the motors
6. If there is no response on the receiver, the
input will be automatically shut off
1. Solder an appropriate connector on the
battery + (red) and battery – (Black) leads.
We recommend Deans Ultra or Anderson
Power Pole connectors. If using a
polarized connector, make sure the polarity
matches your batteries, and make sure
your connector can handle 60 amps of
2. Connect the three motor wires to your
brushless motor (ignore the wire colors).
If the motor spins in the wrong direction,
swap any two of the motor wires to
reverse the direction. Grayson Hobby
recommends using gold plated spring
connectors (also known as bullet
connectors) between the motor and the
speed control to facilitate swapping the
wires. Make sure to cover the bullet
connectors with heat shrink tubing.
3. Plug the servo connector into the
appropriate channel on your receiver.
Most receivers use channel 3 for the
throttle, but some use channel 1. Consult
the manual for your receiver for details.
The red wire on the servo connector is
positive (+), the brown or black wire is
negative (-), and the orange or white wire
is the signal.
4. Install your ESC in a location in your
airplane that receives good cooling
airflow. Keep the motor and battery wires
away from your receiver and antenna.
Battery Elimination Circuit
This Electronic Speed Controller (ESC)
contains a Battery Elimination Circuit (BEC)
which may be used to power your receiver and
servos under certain conditions. This will allow
you to eliminate the separate onboard radio
battery pack, and reduce the weight of your
aircraft. The BEC may not be used
simultaneously with and onboard radio battery
pack. You must use one or the other, but not
both. Up to 4 servos can be used when the
voltage is 7.4V or less. With 11.1V, 3 servos
can be used.
If you are not using the BEC function, you must
clip the red (+) wire on the ESC receiver lead.
(Grayson Hobby Tip) Use a servo extension
between the ESC and RX. Clip the red
extension wire to instead of the ESC wire so
you will maintain the warranty and best of all,
you can use the BEC on your next project.
Cutoff Voltage:
Cutoff voltages are auto-set
Lipo 75% of initial startup voltage
0.8V per unit for NiMh selection
If the proper cell type and cell number is
To Enter Programming
1. Connect the motor and receiver to the
2. Remove battery power from the ESC.
lipo when fully charged, the initial voltage is
4. Reconnect battery power to the ESC.
5. If you are using a separate receiver battery
pack instead of using the BEC, connect the
receiver battery pack and turn it on.
6. Secure the airplane and stay clear of the
7. A sequence of one to three beeps will be
8. The table below summarize the simple
options for the choices:
1 Beep
Lipo self
2 Beep
self protection
4.2V [4.2V x 2 (2S pack) = 8.4V.] ESC cut off at
8.4 * 0.75 = 6.3per pack or 3.15V each cell.
If the cells are not fully charged or if there is
3 Beep
Brake Mode
any other reason causing the voltage to be
lower than 4.2V a cell in some circumstance
the LVC will be lower than 3.0V a cell.
12. If you want to change the brake setting,
repeat steps 2-10.
3. Set the throttle stick to full power and then
turn on the transmitter.
selected, the ESC will cut off at 75% of the
initial voltage. For example, when using a 2s
11. Once you confirm your choice, you will
hear a sharper tone indicating this choice
has been saved.
9. Move the throttle stock to the full down
position if you confirm the option.
10. You should have only one choice
between the lipo self-protection of
NiMh/NiCd self-protection.
CAUTION: At this point the throttle is
armed. If you advance the throttle stick the
motor will run. If you are not ready to fly,
unplug the motor battery and then turn the
transmitter off. Always turn the transmitter
on (and the receiver if you are using a
separate receiver battery) and be sure it is
set at idle position before connecting the
motor battery.
All of your selected programming will be
saved in the ESC. There is no need to
program again unless you wish to change a
Note: If the motor rotates in the wrong
direction, simply switch any two of the three
wires from the speed controller to the motor.
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