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Nov 29, 2021, 06:02 AM
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Frsky Xact Series servos


Iíve recently acquired some of the excellent Frsky Xact standard size servos, 2x BLS 5401H & 2x BLS 5403H. The servo build and finish is top quality, all metal casing, high current capable servo wire, and hex head casing screws . They are supplied with a selection of 5 heavy duty servo arms, long hex head screws, rubber grommets and brass bushes, plus a spare servo arm screw.

Metal gear, dual bearings, all-aluminium CNC machined case. Brushless with hall sensor & supports HV up to and including 8.4v.

The servos support FBUS (F.Port 2.0) protocol which also provides live telemetry data like real-time current and voltage. This data can be transmitted back to the radio by either a FBUS capable receiver or flight controller. A number of features such servo direction, travel, centre & PWM pulse type as can be configured directly on the servo via an ACCESS-capable radio (via ETHOS or LUA script) using FBUS.

The specs are really good, see here:
https://www.frsky-rc.com/frsky-xact-...ervos-release/

Iíve found these to be great servos, very powerful and very fast
Last edited by applewood; Nov 30, 2021 at 03:40 AM.
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Nov 29, 2021, 06:27 AM
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I purchased the FP2CH8 FPort2 channel extender for the purpose of bench testing the telemetry from the servos before installing in my new model. The FP2CH8 unit give you the ability to connect up to small receivers (Archer RS for example) and provide up to 8 Fport2 channel outputs. There are other applications with larger receivers where it supports dual power to the receiver and to the Xact Servos via the FP2CH8. New Tandem receivers TD R18 will support FPort2 on all output channels without the need for channel extender.

Equipment:
2x BLS 5401H & 2x BLS 5403H
Two LIFE batteries
Servo leads
Couple of battery switches
Archer RS latest F/W
X20 Ethos latest S/W F/W

Firstly after Registering and Binding the receiver, I enabled Fport2 on the RS by going in to the Ethos Model & RX System, then clicking Set on RS receiver, then Options, and changing the Telem Port to FPort2 (see picture).

Connected the RS Gnd & S.Port/F.Port on the RS to the FP2CH8 input , noting that the Vin is NC - No Connected. Connect 1st Servo to free port on the FP2CH8. Connected power to the FP2CH8 via the handy XT30 connector (see picture).

Initial servo configuration - you have to configure each servo on it's own channel & IDs. With only 1 servo connected. To do this discover the servo sensor telemetry (see picture), you should see 4 outputs (SRV Status, Temp, Curr & Volt). On the Telemetry screen choose Device Config to enter the setting for the servo, or go to the Device Config on model menu (see picture). You need to configure a unique Physical ID, Application ID and channel number per servo (see picture) so that the system can distinguish them and have separate channel output. Do the same for remaining servos, only 1 servo connected at a time.

Once completed you can connect all servos to the FP2CH8 and rediscover sensors. I've shown some of the telemetry output available (see picture). Also picture of all the connected items.

The configurable areas on the servo also include:

Range - 90deg, 120deg & 180deg
Direction - clockwise or anticlockwise
PWM Pulse type - 1500us or 760us
Servo centre adjustment

Love these servos, feature rich, loads of torque and very fast!!
Nov 30, 2021, 03:51 AM
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Programming the Xact Servos is currently done one by one via the Device Config screen . I understand that Frsky are planning developments and improvements in this area with FBUS protocol and the Ethos system allowing configuration across multiple servos.
Nov 30, 2021, 06:40 AM
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Also as a further note, the channel extender is available in 4, 6 or 8 output port variants for Archer receivers. FP2CH4, FP2CH6 & FP2CH8 devices.

Also for non Archer receivers you can you use the S2F.PORT 2.0 protocol converter device. The S2FPort2.0 takes the receiver's S.Port and SBUS signals, and translate into multiple F.Port 2.0 signal outputs for controlling up to 8 FBUS (F.Port 2.0) capable servos simultaneously.
Dec 01, 2021, 06:20 AM
Quote:
Originally Posted by applewood
Programming the Xact Servos is currently done one by one via the Device Config screen . I understand that Frsky are planning developments and improvements in this area with FBUS protocol and the Ethos system allowing configuration across multiple servos.
Still a very useful feature and easy to use. Here's how I flashed my 5401H servos into dedicated tail servos @ 760us and 90-degree rotation. I did it also on a mini of the previous series.

Setting pulse at 760 on XAct 5401H using ETHOS (5 min 51 sec)


Very precise servos: 5402H on the cyclic before I learned how to program the tail in September...
Sept 16 2021, perfect weather to fly the TT Power (5 min 40 sec)
Dec 01, 2021, 11:50 AM
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Originally Posted by RomeoOscar View Post
Still a very useful feature and easy to use. Here's how I flashed my 5401H servos into dedicated tail servos @ 760us and 90-degree rotation. I did it also on a mini of the previous series.

https://youtu.be/Buqa3CqLDdo

Very precise servos: 5402H on the cyclic before I learned how to program the tail in September... https://youtu.be/sWCpKAglDfY
Great videos Romeo. From your excellent flight video demonstration, it looks like the servos help towards very precise control.
Last edited by applewood; Dec 01, 2021 at 01:20 PM.
Dec 01, 2021, 12:39 PM
Quote:
Originally Posted by applewood
Great videos Romeo. From the demonstration in your flight video, it looks like the servos help towards very precise control.
Thank you and yes they do, good stuff ...
Dec 02, 2021, 10:32 AM
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I can imagine a scenario where I feed a Fport cable to wing panels that contain 2 to 4 servos. I assume that multiple of those FP2CH4 converters can be ported to a single Rx. Is that the case?
Dec 02, 2021, 11:24 AM
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Originally Posted by mabrungard
I can imagine a scenario where I feed a Fport cable to wing panels that contain 2 to 4 servos. I assume that multiple of those FP2CH4 converters can be ported to a single Rx. Is that the case?
I think there are multiple applications. Some may like to use the FBUS (FPort2) with FP2CH4 extender to simplify wiring installation to multiple servos in a wing, like the SBUS extender in the past. This would give you servo control, programmability, telemetry and would match your case.

Its worth noting these servos can also operate normally with PWM without telemetry just like a normal analogue or digital servo

Another application could be to combine with a small receiver (Archer RS for example) that doesn't have channel output pins and supports FBUS. You can use the extender to give you the channel break out pins to individual servos plus servo programmability and telemetry.

Another application could be to connect these servos directly to the receiver channel output pins, like with PWM servos, but with FBUS providing the full Telemetry and Programmability. I do understand the new TD R18 receivers will support this functionality of FBUS on the individual Servo output channel pins, proving servo control, programmability, and telemetry.

I'm sure there are more applications.
Dec 05, 2021, 06:42 AM
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Quote:
Originally Posted by mabrungard
I can imagine a scenario where I feed a Fport cable to wing panels that contain 2 to 4 servos. I assume that multiple of those FP2CH4 converters can be ported to a single Rx. Is that the case?
With regard to multiple FBUS extenders, yes, you would connect FP2CH4/6/8 in series like you would with sensors. So FBUS from RX to FP2CH4 (1) then onward FBUS connection to FP2CH4 (2).
Dec 23, 2021, 08:53 PM
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Has anyone taken a peak inside these servos?
Jan 03, 2022, 09:07 AM
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It appears Frsky servo's are made by the same manufacturer of "Ditex" who previously supplied Hacker and Jeti.

If this is true it's not a bad thing at all.
Jan 06, 2022, 01:37 PM
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Originally Posted by teamdavey
Has anyone taken a peak inside these servos?
I'll take some for you
Jan 06, 2022, 01:40 PM
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FrSky Servo internal pictures


Electronics view, underside of servo. They look very well constructed. Rubber gasket temp removed for photo.
Jan 06, 2022, 01:43 PM
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FrSky Servo internal pictures


FrSky Servo internal pictures. Top view of gears and inside of case. Top case manufactured with fine tolerances to provide a nice snug fit. Again, internals look very well made.


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