Advanced Setup

Further details of the UHV ESC configuration options, cooling recommendations and mounting details.

Advanced Configuration Options

This section of the guide outlines the various configurable elements of the UHV through the configuration tool, along with their default factory settings. All settings are persistent between ESC power cycles.

Motor Drive Settings

Motor Type and Direction

The type of motor that is connected to the ESC (small or large based on kV), and the desired direction the motor will be operated with.

Default setting is: Size is Large <1000kV, Direction is normal

Motor Start Power

The speed the motor will spool up to immediately after arming the ESC.

Default setting is: Medium

Timing Advance

Increased timing advance can reduce ESC running temperatures with some motors. The recommended setting is auto.

Default setting is: 15 Degrees

PWM Drive Frequency

Forces the output frequency to the motor. Recommended is auto setting enabled where possible.

Default setting is: 30 KHz

Throttle Response/Ramp Settings

Acceleration and braking rates for the ESC, which are applied on every change of throttle input to the ESC.

Default setting is: 50 % for both

ESC Limits

Bus Current Limit

The upper current limit the ESC can reach on the input from the power supply. Configurable from 150 to 400 Amps, depending on ESC model.

Default setting is: 300 Amps

Phase Current Limit

The upper current limit the ESC can reach on the output to the motor. Configurable from 150 to 400 Amps, depending on ESC model.

Default setting is: 300 Amps

Temperature Limit

The temperature limit for the ESC as measured internally. Configurable to ranges from 75 to 130 degrees Celsius.

Default setting is: 100 Degrees Celsius

Capacity Limit

The lower limit for the power supply input, to avoid under-voltage of battery packs.

Default setting is: 50,000 mAh

Cut Off Response

The response to going over/under the preset limits, with separate responses for different limits. Options are None, Hard Shutdown, Gradual Shutdown, 75% Power Limit, 50% Power Limit and 25% Power Limit.

Default setting is: Hard Shutdown temperature cut off, None for the rest

Logging Settings

Enable or Disable logging of data to the internal memory of the ESC.

Default setting is: Disabled

Additional Settings

PWM Throttle Endpoints

Adjust the input ranges of the PWM endpoints, can either be manually adjusted or automatically.

Default setting is: Auto Detected

Synchronous Rectification

Toggle the regenerative braking functionality of the ESC. Enabled results in the return of power up to 10% of the maximum current capacity of the ESC (model dependant). Disabled results in no return of power to the supply, but reduces the thermal performance of the ESC. This must be disabled if running the UHV on a power supply that cannot absorb power.

Default setting is: Enabled

Feed-Forward Compensation

ESC will automatically add throttle when voltage drops occur to help maintain a linear throttle response.

Default setting is: Disabled

Motor Beep

Enable or Disable the motor beep status tones.

Default setting is: Enabled

Input Signal Type

Depending on firmware supplied by APD, the input type can be forced between listed protocols.

Default setting is: Normal PWM

Thermal and Mounting Considerations

To achieve optimal product life and avoid reaching the thermal throttle limits of the UHV, the following design considerations of your application should be made to reduce the risk of damaging the ESC.

  • Avoid the use of adhesives on the UHV that may insulate the heat-generating components or case when attaching the ESC or attaching a heat sink.

  • Ensure there is sufficient air-flow passing over the UHV aluminium casing. We recommend the ESC is positioned in an area where it can be actively cooled by propeller wash for example (in a helicopter use case). Mounts for externally power fans are also available.

  • Confirm that the wires selected for the power inputs and motor output terminals are appropriately rated for the anticipated current draw.

  • Check that the terminals are screwed tightly.


Once the ESC is connected to a motor and powered on, the following sequences of tones give statuses and errors as they occur. The tones occur in either high or low beeps (high and low frequency). The output of the tones can be disabled with the motor beep toggle, under Advanced in the configuration tool

Tone Sequence


3 High, 1 High, 1 Low

PWM or ProShot detected + Armed

6 Fast High Tones (5-second repeat)

No signal detected or signal above arming point for the ESC

1 High (10-second repeat)

Normal operation, waiting for arming throttle signal

3 High (10-second repeat)

Thermal limit exceeded last flight, shut down occurred

4 High (10-second repeat)

Under-voltage event occurred last flight, shut down occurred

5 High (10-second repeat)

Over-voltage event occurred last flight, shut down occurred