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HelicopterAerial Photography and Video › Shulze "pulsing issue"
11-28-2007 04:57 AM  9 years agoPost 1
clay454

rrApprentice

Ohio

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I have been having this problem that I cant solve. I think I need a new speed controller.

Maxi Joker
Shulze 160H
Actro 32-4

-Range checks better than ever
-Tanic 42v 3.3AH packs

From time to time the motor will pulse noticably to the point the aircraft will torque back and forth. I know its not a battery issue because it will do it with all of my packs. Any ideas? All of my wiring looks good. ?

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11-28-2007 07:05 AM  9 years agoPost 2
rroback

rrElite Veteran

Irvine (UCI), Ca

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I've been having a lot of trouble getting my maxi tail to be very smooth also. I'm running a powerjazz, but i think it might be pulsing, and I think I hear it pulse, and the headspeed vary, while hovering. a faster headspeed seems to smooth things out.

Rhett..... I can't fly, but the Profi sure can.

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11-28-2007 09:35 PM  9 years agoPost 3
gtarling

rrNovice

London

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If you contact Schulze about the problem, the first thing they will ask is "what connectors are you using?". The next thing they'll probably ask is "what are your wire lengths?". Has this problem always been evident with this controller, or has it only recently manifested itself?

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11-30-2007 12:45 AM  9 years agoPost 4
clay454

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Ohio

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Yea,

I think my next step is new connectors. I am using deans Ultra right now. My wiring is short and heavy besides that. My current never gets much above 20 amps when hovering. I think the initial startup spark has eroded the contacts. I will let you know. Its kinda scary when your headspeed starts to wander.

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11-30-2007 05:09 PM  9 years agoPost 5
AceBird

rrElite Veteran

Utica, NY USA

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I think the initial startup spark has eroded the contacts.
Why do they spark? Is there a big load present when you plug them in? I would think a sudden inrush current would not be good for the controller every time you plug the battery in.

Ace
What could be more fun?

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11-30-2007 06:26 PM  9 years agoPost 6
clay454

rrApprentice

Ohio

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When I connect the battery to the controller I always get a spark. I think this is normal for this. There is a huge potential difference when the conection is made. 42v vs 0v. I changed connectors last night. I inspected the old ones and I cant see how they would be bad. ill kepp you posted.

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11-30-2007 09:32 PM  9 years agoPost 7
AceBird

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Utica, NY USA

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There is a huge potential difference when the conection is made.
That may be but the spark implies current. What is drawing the current? Take for instance any thing that you plug in at home (110V for USA) if the device is not turned on there is no spark when you plug it in.

Ace
What could be more fun?

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12-01-2007 01:29 AM  9 years agoPost 8
rroback

rrElite Veteran

Irvine (UCI), Ca

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these esc's have big caps that charge up, hence the big sparks. Get a powerjazz.. no spark.

Rhett..... I can't fly, but the Profi sure can.

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12-01-2007 02:18 PM  9 years agoPost 9
AceBird

rrElite Veteran

Utica, NY USA

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I think I would put a resistor in the line and then short the resistor after a second or two if the caps are a problem.

Ace
What could be more fun?

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12-01-2007 03:26 PM  9 years agoPost 10
catfight

rrKey Veteran

USA

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You can eliminate spark when connecting battery by using 2 sets of connectors (2 males on the ESC, and 2 females on the battery - 1 connector has a 68 ohm resistor in line withit). You connect the one with the resistor first (this charges the capacitor on the ESC) and then connect the straight thru one. It does not matter which you disconnect first after flight.

I did search for this without any luck but have seen pictures and drawings somewhere?

What goes up must come around

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12-02-2007 07:46 PM  9 years agoPost 11
clay454

rrApprentice

Ohio

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I could eliminate the spark. But it doesnt do any harm? The huge caps are the initial load that cause the potential difference. So a powerjazz has been a good controller? Have you ran it hard? Are you worried about the amp rating on it? Is it 55A continous?

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