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YGE Brushless Controller ESC 90LV V.4. Lipo Capacity 2 to 6s with BEC

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  • 90A continuous with good cooling
  • 2 to 6s LiPos with automatic detection, undervoltage feedback.
  • 6 to 18 cells NiMh
  • Undervoltage feedback disableable.
  • Switching BEC 5,5V / 7,4V / 8V, 6A continuous, 12A Peak, jumper settable
  • Governor-Mode
  • Soft start
  • Infinitely adjustable F3A brake
  • Active freewheel, for efficient partial load handling
  • Automatic Timing or in 6 setting choices
  • Electronic brake with 3 settings
  • 8-16 kHz
  • Max RPM: 240.000 (2-Pole)
  • Over temp notification
  • Integrated anti-spark
  • Dimensions:  64 x 32 x 13 mm
  • Weight 52g without cables, 82g with
  • Programming with ProgCard III
  • Includes external governor support
YGE 90LV, 120LV and 120LV-K electronic speed controller (ESC)“K” with heat sink 
Initial setup: 
Connect the Master J/R cabel to receiver throttle channel 
or FBL System and the Slave into an empty slot.  With 
vbar read the manual for external governoring. 
For security and liability reasons we strongly 
recomend the use of a buffer-battery for the reciever 
system. 4 cell NiCd/NiMh or 2 cell LiPo battery with 
minimum 800mAh must be connected to the receiver 
or FBL-system in parallel to the BEC. 
After connecting the battery (red = positiv, black = neg.) 
you hear 3 descending tones. Subsequently, follows  a 
number of beeps according to the cell number of the
connected Lipo battery. In case the transmitter stick is in 
throttle off, you hear now 3 ascending tones. 
You need to connect the motor to hear the beeps, as it is 
the motor itself which acts as a speaker. 
--- The ESC is ready for use. --- 
If the motor turns in the wrong direction, exchange simply 
2 of the 3 motor wires. 
Use only clean and tight gold connectors for motor  and 
battery. Pay attention for the battery connector to choose 
a polarity safe system. Exchange low-friction or oxidized 
plugs and sockets. Because only tight sitting contacts will 
ensure a high current flow, protect the speed controller 
against dangerous voltage peaks and avoid 
disturbances. With all ESC types, the entire wire length, 
from the controller to the battery, may not exceed 25cm. 
If longer wires are necessary, a Low ESR switching 
capacitor of 330µF/25V should be soldered between plus 
and minus wires every 20cm. You might also consider
using our capacitor module YGE Cap´s typ 5. Likewise 
the motor wires can be extended. Then please twist the 3 
lines, in order to minimize interference emission. 
Note: Inverting the Battery polarity leads to heavy
damage and to the loss of warranty!!! 
General Settings: 
The speed controller has a fixed throttle curve setting, so 
that with all usual transmitters the stop and full power points 
are linearly connected. With all programmable transmitters, 
the throttle range should be set to default (±100%), the 
center point set to zero and throttle trim enabled.
Nevertheless, with some transmitter types the range needs 
to be adjusted.  For that the throttle endpoints have to be set 
so that one notch before lowest stick position the motor is 
stopped and that one notch before full power the motor is 
actually at full power. Full power is indicated by the LED that 
is completely turned off. 
On delivery the Timing is adjusted to 18°, brake is set to mid 
level, and the under voltage recognition adjusted to Lipo 
mode 3.1 V. 
If during spin up rpm variations (wowing or erratic sound) are 
experienced, the timing must be increased. If no 
improvement can be obtained at 30°, then the motor  is 
overloaded. Here a smaller propeller, a one cell smaller 
battery or a stronger motor will help. If after motor stop you 
hear 2 beeps repeating, it means that the battery voltage 
dropped down below the setting value. Eventually try a cutoff 
voltage of 2.9 or 3.0V per cell. If there is still  no 
improvement, then the battery is discharged or too weak, the 
wires are too long or to small or a connector is out of order. 
With an active brake you can hear these warning tones only 
in windmill position. This is the small range on the throttle 
stick between brake and motor start. You can reach  this 
position with 2 notches or with a high trim and a short gas 
If no automatic timing is wished, it can be adjusted according 
to the following guideline.  
Inrunner  0 to 12°  
Outrunner 18 to 30°  
If your motor manufacturer indicates a timing 
recommendation, it is of course preferable to use it. 
Basic rule: the higher the timing the higher the full power 
                                     Type               90LV                120LV                 120LVK
Overall dimensions in mm                 64 x 32 x 13      64 x 32 x 13          64 x 32 x 19
Weight in g without/with wires               52/82                54/84                      67/97
Cable diameter Battery/Motor              4² / 4²               4² / 4²                      4² / 4²                                                                            The easiest to make these changes is the ProgCard. There is 
also the possibility to perform the setup with the transmitter; 
however it will not be explained here. You will find it in the 
RC-setup manual under in the Download area. 
Please notice that the complete features set can only be 
reached through the YGE programming card. 
In case you get inadvertently in the programming mode 
during a normal start-up (throttle stick at full power), simply 
disconnect the battery, lower the stick to stop, and connect 
the battery again. Thus you won’t modify the adjustments. 
Helicopter settings 
For helicopters in governor mode, the full throttle range 
(100%) must be calibrated once. For some transmitters, 
this range is indicated in the helicopter menu (throttle 
curve 0-100%). This throttle curve will then correspond to 
the controller throttle from 0 to 100%. Please refer also to 
ProgCard or RC-Setup manual. 
When activating one of the governor modes, all relevant 
heli parameters are set to default. This default will fit 
nearly all setups. You don’t need to program further at a 
first step. 
Here a listing of the default settings. 
- Timing = 18° 
- Brake off  
- Act. Freew. on  
- P-Gain = 0,9 
- I-Gain = 0,05 
- Startup Speed = Heli middle  
- PWM-Frequency = 8 kHz ) 
- Startup Power = Auto 1-32% (sometimes is better 2 or 
You should modify the default settings of P-Gain, I-Gain 
and PWM frequency, only if you don’t get the desired 
success, and if you are sure of the correct setting of all 
other components. 
Lipo protection / under-voltage protection: 
Because of the tension driven load adjustment it is
possible to fly further with low power, since the battery 
recovers with smaller load. However, if the tension
continues to break in, the motor is switched off. 
Active free-wheel: 
The unlimited partial load capability refers to the maximum 
full power current . 
Temperature / overload warning: 
If the speed controller’s temperature exceeds its limit, 
because of overloading or lack of cooling, after landing 
and/or motor stop, a warning signal is issued (3 Beeps in 
the interval). But the motor is  not switched off  in flight 
unless the temperature becomes extremely critical,  then 
the motor switched off. 
The partial load operation between half and nearly  full 
power is the most difficult area for an ESC. In addition the 
running time becomes longer and longer with the Lipo 
technology. If it should come to repeated temperature 
warnings, better cooling should be provided or current 
should be reduced. These warnings are to be regarded as 
overload warnings and  not as normal operating 
condition. Because at high temperature the components 
are strongly stressed, this leads to a decreased life time.   
You achieve a better cooling not only through sufficiently 
dimensioned air intake, but even more efficiently through a 
larger air outtake, in order to avoid a heat accumulation. 
You achieve smaller currents by using a smaller propeller 
or a one cell smaller battery. 
Additionally to the use of the BEC a receiver buffer battery 
can be connected through a switch cable into a free plug of 
the receiver or a through Y-cable. 
The buffer battery avoids tension drops on hard servo 
maneuvers, protecting the receiver’s functionality.
Step 5.7V  4 cell NiCd/NiMH 
Step 7.4V  2 cell Li-Ion 
Step 8.0V  2 cell Li-Po 
Make sure that no discharged receiver battery is used, 
because this would load the BEC additionally by charging 
the battery.  A half or fully loaded Battery will not be charged 
and is only discharged in extreme conditions. The plus (red) 
wire of the receiver cable does not need to be disconnected. 
Several YGE ESC’s can be connected to a single receiver 
without any special precautions (Parallel use of all the 
BECs). The total maximum available load is the sum of the 
individual BECs.
 A configuration without BEC and with galvanic separation is 
also possible. For that please use our opto coupler module.  
Fundamentally it is important to make sure that no  objects 
are within the propeller circle when batteries are connected.  
The use of this speed controller is therefore allowed only in 
situations where damages and personal injuries are 
impossible. A damaged governor (e.g. broken, damaged by 
polarity inversion or humidity) must not be reused under any 
circumstances. Otherwise it can come to a later malfunctions 
or failures.
The ESC may only be powered from batteries, a use from 
power supplies is not allowed. 
Trouble shooting:  
1 Beeps/flashes: stick position and / or speed 
   for Gov.-Store  not taught correctly. 
2 Beeps/flashes: Under-voltage identification 
3 Beeps/flashes: Temperature rise warning 
5 Beeps/flashes: Receiver signals failed 
6 Beeps/flashes: start up failed 
The ESC signals any error that happened during flight 
acoustically (motor) and optically with a blinking LED code. 
Errors 2 and 3 are signaled after motor stop, but aren’t 
stored as long as the ESC didn’t cut off completely (low 
voltage / temperature warning). In case the error led to a 
complete cut off, then it is not cleared by a tension RESET. 
The deletion can take place only on purpose by connecting 
the battery with the stick at full power and/or with 100% 
throttle pre-selection (throttle curve), and disconnecting it 
again after the interval beep. Please you leave the stick at 
full power, while disconnecting, otherwise you activate the 
Likewise the errors can be cleared by activating the 
With an activated brake, the error is only signaled after a 
tension reset or in wind milling position. 
We give 6 months warranty on this speedcontroller.  Any 
other requirements are excluded. That applies in particular to 
requirements for damage or injuries compensation due to 
malfunction or failure. For damages to property or personal 
injuries and their consequences, which developed from our 
supply or craftsmanship, we do not take any liability, since 
we have no control on handling and use


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