Explain: Which is correct?
#1
Thread Starter
Member
Joined: Mar 2009
Posts: 77
Likes: 0
Received 0 Likes
on
0 Posts
From: Hermantown,
MN
Two part question, Please answer both.
Bax, In this post- http://www.rcuniverse.com/forum/m_11511276/tm.htm I asked the question Can the R617FS handle all 10 servos?
Your reply was: As long as you don't exceed 8 Amps at peak and 3 Amps continuous, you'll be OK.
Now in this : http://www.futaba-rc.com/faq/faq-receivers-q962.html, regarding large number of servos, Futaba said this: On all Futaba receivers the amp draw will be 8 amps continuous and 10 amps peak.
Which is correct? Regarding multiple servos, I also found this: FAQ
I am wondering about the amp draw on my receiver. I am using eight S9351's, three S9352's and one S9252's, each in its separate channel. What effect will these have on my receiver and can it handle the load?
The receiver will not have a problem with the number or type of servos used. A large number of servos, such as the number that you are using, could cause the battery voltage to drop below what the receiver requires. You would want to make sure that your servo and battery wiring could handle the current needed from the servos without giving you much voltage drop. Many times this is why NiCd batteries are preferred, as they can deliver more current with less voltage drop than many other battery types.
While it doesn't say which" rx he had, assuming as it was stated in the FAQ (On all Futaba receivers the amp draw will be 8 amps continuous and 10 amps peak.) he then can run 12 digital servos without worry, given strong enough Rx battery pack (Like the one listed below) Correct? I am seeing way to many contradictions here.
This was the batt pack that was in previous post I made, there was no mention made that is was/ was not sufficient!
A123 Systems 26650 Nano M1 Pack
Pack Voltage: 6.6v 2300ma
Rating: 30C (69.0A) Continuous
Regading dual power feeds to Rx.
Also, in checking with others, they suggested running dual feeds into Rx, either an additional pack or secondary feed from battery, both used on a Y-harness for the highest drain servo/'s. Possible? If not WHY? Spectrum can do it. http://www.rcgroups.com/forums/showp...2&postcount=20 or this: http://www.rcgroups.com/forums/showp...81&postcount=2
Thanks.
Bax, In this post- http://www.rcuniverse.com/forum/m_11511276/tm.htm I asked the question Can the R617FS handle all 10 servos?
Your reply was: As long as you don't exceed 8 Amps at peak and 3 Amps continuous, you'll be OK.
Now in this : http://www.futaba-rc.com/faq/faq-receivers-q962.html, regarding large number of servos, Futaba said this: On all Futaba receivers the amp draw will be 8 amps continuous and 10 amps peak.
Which is correct? Regarding multiple servos, I also found this: FAQ
I am wondering about the amp draw on my receiver. I am using eight S9351's, three S9352's and one S9252's, each in its separate channel. What effect will these have on my receiver and can it handle the load?
The receiver will not have a problem with the number or type of servos used. A large number of servos, such as the number that you are using, could cause the battery voltage to drop below what the receiver requires. You would want to make sure that your servo and battery wiring could handle the current needed from the servos without giving you much voltage drop. Many times this is why NiCd batteries are preferred, as they can deliver more current with less voltage drop than many other battery types.
While it doesn't say which" rx he had, assuming as it was stated in the FAQ (On all Futaba receivers the amp draw will be 8 amps continuous and 10 amps peak.) he then can run 12 digital servos without worry, given strong enough Rx battery pack (Like the one listed below) Correct? I am seeing way to many contradictions here.
This was the batt pack that was in previous post I made, there was no mention made that is was/ was not sufficient!
A123 Systems 26650 Nano M1 Pack
Pack Voltage: 6.6v 2300ma
Rating: 30C (69.0A) Continuous
Regading dual power feeds to Rx.
Also, in checking with others, they suggested running dual feeds into Rx, either an additional pack or secondary feed from battery, both used on a Y-harness for the highest drain servo/'s. Possible? If not WHY? Spectrum can do it. http://www.rcgroups.com/forums/showp...2&postcount=20 or this: http://www.rcgroups.com/forums/showp...81&postcount=2
Thanks.
#2
Senior Member
If you are really serious about high current to servos and compatibility with receivers - -
Consider that Radio Shack (and others) sell small PC boards that have holes on a grid that happens to match the pin spacing of servo connectors.
Headers are also available, as well as various parts from hansenhobbies.com.
You make short servo cables that connect the receiver to the PC board, and install either short cables with male pin servo connectors, or headers on the PC board The battery is then connected to the PC board. The power buss is on the PC board, and if needed, a capacitor or two across the power buss. This allows servo current to bypass the receiver.
It also makes it easier to use a receiver with multiple models.
Common servo wire color codes
White or yellow Servo control signal
Red Positive power (4.8 to 6v or so)
Black or Brown negative power/common
When using multiple batteries, remember that the batteries must be of equal voltage, the closer the better.
They do not have to be of equal storage capacity, but should be of similar cells. (has to do with internal resistance of the cells)
More elaborate devices are sold for a price, and usually used on such things as giant scale models.
It's possible to use decoupling diodes to make the batteries more independent, but usually not needed.
Consider that Radio Shack (and others) sell small PC boards that have holes on a grid that happens to match the pin spacing of servo connectors.
Headers are also available, as well as various parts from hansenhobbies.com.
You make short servo cables that connect the receiver to the PC board, and install either short cables with male pin servo connectors, or headers on the PC board The battery is then connected to the PC board. The power buss is on the PC board, and if needed, a capacitor or two across the power buss. This allows servo current to bypass the receiver.
It also makes it easier to use a receiver with multiple models.
Common servo wire color codes
White or yellow Servo control signal
Red Positive power (4.8 to 6v or so)
Black or Brown negative power/common
When using multiple batteries, remember that the batteries must be of equal voltage, the closer the better.
They do not have to be of equal storage capacity, but should be of similar cells. (has to do with internal resistance of the cells)
More elaborate devices are sold for a price, and usually used on such things as giant scale models.
It's possible to use decoupling diodes to make the batteries more independent, but usually not needed.
#3
Thread Starter
Member
Joined: Mar 2009
Posts: 77
Likes: 0
Received 0 Likes
on
0 Posts
From: Hermantown,
MN
You apparently misread the post. the question was which is Correct.
This was a question I asked in a different post, a total of 10 anolog servos
three examples, As long as you don't exceed 8 Amps at peak and 3 Amps continuous, you'll be OK.
Receiver Technical Information
I need to know the amp draw on your (blank) receiver as I am using a large number of servos on my plane.
On all Futaba receivers the amp draw will be 8 amps continuous and 10 amps peak.
I am wondering about the amp draw on my receiver. I am using eight S9351's, three S9352's and one S9252's, each in its separate channel. What effect will these have on my receiver and can it handle the load?
The receiver will not have a problem with the number or type of servos used. A large number of servos, such as the number that you are using, could cause the battery voltage to drop below what the receiver requires. You would want to make sure that your servo and battery wiring could handle the current needed from the servos without giving you much voltage drop. Many times this is why NiCd batteries are preferred, as they can deliver more current with less voltage drop than many other battery types
The first 2 conflict with each other, the 3rd, does,nt seem to matter that he is running 12 digital servos,
I know about the battery power, it was in my previous question. So, Which is correct?
This was a question I asked in a different post, a total of 10 anolog servos
three examples, As long as you don't exceed 8 Amps at peak and 3 Amps continuous, you'll be OK.
Receiver Technical Information
I need to know the amp draw on your (blank) receiver as I am using a large number of servos on my plane.
On all Futaba receivers the amp draw will be 8 amps continuous and 10 amps peak.
I am wondering about the amp draw on my receiver. I am using eight S9351's, three S9352's and one S9252's, each in its separate channel. What effect will these have on my receiver and can it handle the load?
The receiver will not have a problem with the number or type of servos used. A large number of servos, such as the number that you are using, could cause the battery voltage to drop below what the receiver requires. You would want to make sure that your servo and battery wiring could handle the current needed from the servos without giving you much voltage drop. Many times this is why NiCd batteries are preferred, as they can deliver more current with less voltage drop than many other battery types
The first 2 conflict with each other, the 3rd, does,nt seem to matter that he is running 12 digital servos,
I know about the battery power, it was in my previous question. So, Which is correct?



