Hitec HSR-5990TG Overload Protection Bypass

[KBrog]

I Bought this servo about two years ago to use on my comp rig. Ran it maybe 3 or 4 comps and it started not responding when in a heavy bind. I sent it to Hitec thinking something was wrong with it. Turns out its working fine. It has a built in overload protection. So its been sitting useless in my desk ever since. I even pluged it in a servo programmer to try and turn the overload off, and could not turn it off.

Is there some way I can solder something on the board to bypass the overload?

Link to specs HSR-5990TG Servo


Control System: +Pulse Width Control 1500usec Neutral
Required Pulse: 3.3-7.4 Volt Peak to Peak Square Wave
Operating Voltage Range: 4.8-7.4 Volts
Operating Temperature Range: -20 to +60 Degree C (-68F to +140F)
Operating Speed (6.0V): 0.15 sec/60° at no load
Operating Speed (7.4V): 0.12sec/60° at no load
Stall Torque (6.0V): 333.29 oz-in. (24kg.cm)
Stall Torque (7.4V): 416.61 oz-in. (30kg.cm)
Standing Torque (6.0V): 433.27 oz-in. (31.2kg.cm) 5 degree deflection
Standing Torque (7.4V): 541.59 oz-in. (39kg.cm) 5 degree deflection
Operating Angle: 60 Deg. one side pulse traveling 450usec
360 Modifiable: Yes
Direction: Clockwise/Pulse Traveling 1500 to 1950usec
Idle Current Drain (6.0V): 3mA at stop
Idle Current Drain (7.4V): 3mA at stop
Current Drain (6.0V): 300mA/idle and 4.2 amps at lock/stall
Current Drain (7.4V): 380mA/idle and 5.2 amps at lock/stall
Dead Band Width: 2usec
Motor Type: Coreless Metal Brush
Potentiometer Drive: 6 SliderIndirect Drive
Bearing Type: Dual Ball Bearing MR106
Gear Type: 4 Titanium Gears
Connector Wire Length: 11.81" (300mm)
Dimensions: 1.57" x 0.78"x 1.45" (40 x 20 x 37mm)
Weight: 2.18oz (62g)


Pic of each side of the board.

[Charlie-III]

How it is powered??
Is it through the RX or direct from an external BEC??

I ALWAYS use a direct connection from the external BEC to the servo.

[The CrAwLL BLACK]

Do you have the Hitec programmer with the computer software?

Can you post up screen shots of the settings and options?

Are you able to change the overload setting to not drop the power so much?

It's been a while since I've run the software on servos, but from memory there was the ability to set the power reduction % for the overload.

Cheers,
Mike.

[KBrog]

It was powered straight from the BEC. Tried it at 6.0v and 7.4v. Both with the same result.

[KBrog]

Originally Posted by The CrAwLL BLACK

Do you have the Hitec programmer with the computer software?
I borrowed the programmer from ROWDY RACING, and downloaded the software from Hitec. Here is a link to the programmer. HPP-21 - Hitec RCD
Can you post up screen shots of the settings and options?
I gave the programmer back already, but I can borrow it again.
Are you able to change the overload setting to not drop the power so much?
Don't know. Im gonna have to check and see if I can adjust that setting. When I tried to program it I only tried to turn the overload off. Which I was unable to do. The setting will not allow it to be turned off.
It's been a while since I've run the software on servos, but from memory there was the ability to set the power reduction % for the overload.
I hope so, it sounds promising.
Cheers,
Mike.

Thanks for the idea. I will try it out.

[The CrAwLL BLACK]

The other thing to consider is the size of your battery - mAh, and C rating.

This will determine the maximum amp draw....and may also be a cause of the problem....

Easy enough to test by throwing in a bigger battery...

Cheers,
Mike.

[KBrog]

1300mah 30C, and 1100mah 45C.

[Rig Rocker]

I think it is percentage of bypass is too high. I run 10% on my comp rigs

[KBrog]

Im gonna borrow the programmer again and see if I can change the % value.

[ROWDY RACING]

You can use the programmer any time Karl let me know.

[KBrog]

Well programming was a waist. This is what I get when I tried. The servo says "digital" right on the case. What a bummer....

[KBrog]

I was able to test the servo with the programmer, it works fine. Works when pluged into a receiver. But, without the programmer recognizing it as a digital servo I cant do anything with it.

It goes back to the first post. Is there something on the board I can solder to bypass the overload?

[Rig Rocker]

Do you know that you have to hook a receiver pack or 4 AA's to power the servo? I know it's weird and it should power through USB, but it doesnt. That message is exactly what you get when no battery hooked up to programmer.

[KBrog]

Originally Posted by Rig Rocker

Do you know that you have to hook a receiver pack or 4 AA's to power the servo? I know it's weird and it should power through USB, but it doesnt. That message is exactly what you get when no battery hooked up to programmer.

Sure do. I had a receiver pack hooked up. Even checked the voltage on the receiver pack. It was 6.80v.

Thanks for asking though.