Servo delay in movement condition UPDATED REUPDATED (Full Version)

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cnbhome -> Servo delay in movement condition UPDATED REUPDATED (7/25/2003 3:52:10 AM)

Mike.... I have been using Hitec servos for a couple of years and have never seen this condition before. I just purchased 10 5925MG's from ServoCity for a 40%. They have a MFG date of March 02. After setup in the model I discovered that two out of three on one wing aileron and one of two in an elevator would delay movement when returning to center, sometimes they would react without additional control input and other times it would take something to get them back to center. They are running on a Futaba 9WC2/309DPS through an optical isolator.

Here is the interesting twist. There are two Powerflite battery systems driving the flight servos and if both of them are on there is no problem but if one or the other is off there is a delay. The heavy duty regulators are putting out 5.9 volts under load at the end of the cables. My other 40% has virtually the same setup and I do not have this problem.

I returned two of the servos and they were replaced early on, but now the third is exhibiting the problem. Do you have any suggestions or should I try to get a warranty replacement.

thanks Chris



MikeMayberry -> Servo delay in movement condition UPDATED REUPDATED (7/25/2003 8:20:51 PM)

I'm not familiar with any problems such as this. Make sure you are using heavy duty extentions. Many of the problems we have seen have been power/amperage related.

Mike.



cnbhome -> Servo delay in movement condition UPDATED REUPDATED (7/25/2003 10:39:41 PM)

Mike... Yes the extentions are heavy duty 20GA and I eliminated most of the plug connections. The problem does not repeat if I change the servo so it is servo specific. I was hoping that something else was the cause from a failure point.

Should I send the servo in for warranty or what?

Chris



modeltronics -> Servo delay in movement condition UPDATED REUPDATED (7/25/2003 11:58:08 PM)

I hope Mike doesn't mind if I put in a comment. What would be interesting to see is the voltage at the servo when it is returning to center. My speculation is that there is a voltage drop in the system someplace durring the initial inrush of current. The only way to see this is to put a scope on the power leads right at the servo. A volt meter would never be fast enough to see the voltage dip. Just my .02 worth :)

Pete



cnbhome -> Servo delay in movement condition UPDATED REUPDATED (7/28/2003 8:37:39 PM)

Possibly except that when I changed the servo the problem solved. I just thing there was a bad group within that batch of servos made in March of last year. I just discovered another person in the club had the same problem from that batch and he returned it for replacement. Hitec must know or have statistics on this and should be a bit more responsible when there is a bump in the quality.

I am sure they will replace the servo but it would be nice to have a bit more honesty up front.



MikeMayberry -> Servo delay in movement condition UPDATED REUPDATED (7/30/2003 4:08:50 AM)

Mar 02 is not the date code the servos were build but the date of the last software update. There is no known "Bad Batch" of digital servos.

Mike.



cnbhome -> Servo delay in movement condition UPDATED REUPDATED (7/31/2003 2:38:52 AM)

Mike .... OK but it sure seems strange to me that we would see this same problem on different projects on servos coming from different suppliers in the same time frame. I still like the product and own about $3,000 dollars worth of them, I am just disapointed .



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