Installation and power #
Do I need to install the electrolytic capacitor? Yes. Use the supplied low-ESR capacitor, mounted at the battery pads with short leads. At least 35V for 6S, 50V for 8S. More in Installing an ESC so it survives.
Can I mount the capacitor on the XT60? Not recommended. The farther it sits from the ESC, the less it does about the fast spikes that kill MOSFETs. Why that matters: What your dead ESC is telling you.
Can VOLTARA ESCs run on 8S? Yes. Both the 70A and the MINI 50A support 3S to 8S.
Should I use a smoke stopper? Yes, for the first power-up after any soldering or repair. A bench power supply with a current limit works too.
Should the ESC be soft-mounted? Yes. Use the grommets without crushing them, and make sure nothing touches the underside of the PCB. Board flex is one of the most common causes of delayed failures: Installing an ESC so it survives.
Compatibility #
Which flight controllers and protocols are supported? Gen2 works with any flight controller that outputs a supported signal, including Betaflight, KISS Ultra, INAV and ArduPilot. DShot 150, 300, 600, 1200 and 2400 are auto-detected, bidirectional DShot up to 600, plus analog PWM. Full list: VOLTARA Gen2 firmware.
Do I need separate firmware for bidirectional DShot? No. Gen2 is one firmware and detects the protocol automatically.
Configurator and firmware #
How do I configure my ESC? Through the VOLTARA Configurator, over your flight controller’s passthrough. Every setting is described in Gen2 FW configuration options.
Does the battery need to be connected? Yes. USB powers the flight controller, but the ESC needs its own power. Props off first.
Can older VOLTARA ESCs be upgraded to Gen2? Yes, once, with the migration tool in the Configurator: How to migrate to Gen2.
Can I go back to Legacy firmware after migrating? No. Treat the migration as one-way.
What do the LED and the beeps mean? See Gen2 LED patterns and Gen2 sound patterns. The LED error code is three fast blinks followed by the error number in slow blinks.
Motor setup #
How do I reverse a motor? Change its direction in the Configurator, or from your flight controller’s motor tab. No need to swap wires.
Should I check motor order before flying? Always. With props off, check motor order, motor direction, FC orientation and prop direction.
One motor stutters on startup. Is the ESC bad? Not necessarily. Swap that motor to another output. If the problem follows the motor, it’s the motor. If it stays on the output, check the wiring and solder joints. Details: Troubleshooting by symptom.
PWM, timing and ramp #
What PWM frequency should I use? AUTO, which adapts the frequency to motor RPM. Fixed options are 24, 32, 48 and 64 kHz, for specific problems only: PWM frequency, explained.
What timing should I use? AUTO, which varies the advance with the operating condition up to 18 degrees. Manual values from 8 to 30 degrees exist for special cases: Timing advance.
What do Ramp Up and Ramp Down do? They limit how fast the ESC is allowed to increase and decrease power. 100% is fastest (about 1 ms), 0% is slowest (about 100 ms). Both default to 100%: ESC ramp-up and ramp-down.
What is Low RPM Protect? It limits how fast throttle can rise while the motor is still slow, so a sudden throttle slam can’t outrun the motor. Default is Medium on firmware 1.09 and later, and normal response returns as soon as the motor is up to speed.
Should I lower ramp if my quad oscillates? Usually no. Continuous oscillation, prop wash and jello are flight-controller tuning or mechanical problems. Ramp matters when the problem appears specifically during very fast acceleration or deceleration.
Where is the idle setting? There isn’t one on the ESC. Idle comes from your flight controller, for example motor idle or dynamic idle in Betaflight. When a doc here suggests a little more idle, that’s the setting it means.
RPM and telemetry #
Does Gen2 support RPM filtering? Yes. Enable bidirectional DShot on the flight controller. The ESC detects it automatically, and two beeps and two LED flashes at startup confirm it.
What is the difference between RPM telemetry and ESC telemetry? They are two separate paths. RPM telemetry is part of bidirectional DShot and travels back up the signal wire itself; it is what the RPM filter uses, and Extended DShot Telemetry (EDT) can carry additional data on that same return path where the flight controller supports it. ESC telemetry is a separate single wire, shared by all four ESCs, carrying RPM, voltage, current, temperature, and consumption.
Do I need both? They work together, and each does something the other does not. Use bidirectional DShot for RPM filtering. Connect the ESC telemetry wire if you want the flight controller to use the ESC’s own voltage and current measurements.
How do I get ESC voltage and current into my flight controller? Over the ESC telemetry wire, and only that way. VOLTARA does not provide an analog current-sense output, so the flight controller cannot read ESC current from a sensor pin. Connect the telemetry wire to a spare UART, enable ESC sensor telemetry on the flight controller, and set its current and battery meter source to ESC. Wiring is in the 70A and MINI 50A connection diagrams.
Does every flight controller support all Gen2 telemetry? No, it depends on the FC firmware. KISS, for example, does not currently use bidirectional DShot telemetry.
Protections #
What protections does Gen2 have? Soft current limiting, thermal rollback, stuck-rotor detection, stall recovery, shorted-FET detection at boot, a winding short check, and gate driver fault detection. Each one is described in Gen2 FW configuration options.
Should I disable protections for more performance? No. They reduce power gradually rather than cutting it, so they cost nothing until something is already going wrong.
Troubleshooting #
A motor stops during a hard punch. Check the prop, bearings, phase wires, and solder joints first. If the hardware is healthy, soften Ramp Up slightly or raise Low RPM Protect. Full sequence: Troubleshooting by symptom.
My quad bobbles after a sudden throttle cut. Soften Ramp Down and leave Ramp Up alone if acceleration is fine. A little more idle on the FC side can help on small, powerful builds. The explanation is in ESC ramp-up and ramp-down.
My ESC is very hot after normal flights. Check prop load, motor condition, and airflow first, then PWM frequency and timing. See Troubleshooting by symptom.
My motors are hot, but the ESC is cool. Look at the flight controller tune and filtering first, then props, bearings, and timing.
The quad flips immediately on takeoff. Almost always motor order, motor direction, FC orientation, or prop direction. Check all four with props off.
The ESC smoked or popped. Should I plug it in again? No. Disconnect it, photograph both sides before desoldering anything, and work through what your dead ESC is telling you.
I think my ESC is dead. What do you need from me? Clear photos of both sides, what happened and when, and your setup: motors, props, battery, flight controller, and firmware. Send it to support@voltararc.com or ask on Discord.
Defaults #
What should I change on a new Gen2 installation? For most builds, nothing. Verify motor order and direction, fly it, and change a setting only when you have a specific reason.
