| Author |
Message |
James Comfort
Unregistered guest
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| Posted on Wednesday, December 5, 2007 - 12:02 am: |
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Please could you tell me whether the SyRen 10 Regen 10A (Part No: 1506-001) and
Sabertooth Dual 10A (Part No: 1506-005) motor controllers are compatible with
the 24V 250W geared 9.778:1 MY1016Z2 (Part No: 1471-100) DC motor. Thanks for
your time,
James |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 644
Registered: 10-2004
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| Posted on Wednesday, December 5, 2007 - 6:41 pm: |
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James,
Looking at the data on the motor, it will draw over 10A at its nominal power output. All depends on the application and how much load is put on the motor. Fast acceleration, rapid reversing will be too great for this size of controller, light duty may just be possible. If you can advise your application through this forum, we will confirm but the chances are you will need a larger controller. |
Ray Wood
Unregistered guest
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| Posted on Monday, January 21, 2008 - 5:28 pm: |
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Sabertooth Dual 25A Motor Controller
Hi,
I am interested in this product for my twin prop Tug does it only work with brushed motors or can it be used with any type of motor, can it also be used with a mixer?
I don't know that much about electronics but if the controller works with any type of motor it may just be what I need, can you tell me what the maximum size motor it would be safe to run it with.
Kind regards
Ray |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 679
Registered: 10-2004
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| Posted on Monday, January 21, 2008 - 7:35 pm: |
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Ray,
It is only for brushed motors. It does of course come with its own on-board mixer but if you wish to you an external one you can. The controller is design for 25A continuous but if you can give us details of your intended motor, we can further advise. |
Steve Smith
Unregistered guest
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| Posted on Thursday, April 10, 2008 - 9:46 am: |
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Hi,
I would like to use one of your Syren10 controllers connected to an MFA970 motor/gearbox
(the 2818:1 gearbox) This uses the RE540/1 motor.
I will be controlling it from a Pot using the analogue mode, but will be powering the whole kit from a 15V/10A switchmode bench PSU.
Ideally I would like to be able to reverse the motor by reversing the contacts on the POT using a small relay triggered by a couple of opto-slot switches and a flip-flop to toggle the direction each time one of the opto's is triggered.
My questions are,
1. Will the module drive an MFA970 motor ok ?
2. Will a 10A bench PSU work or will I need a large Capacitor to simulate the lack of battery (tech desc says reversing the motor dumps load into battery) ?
3. Is reversing the POT connections (CW & CCW not wiper)allowed ?
4. how much current is available on the 5V pin to power my CMOs logic and opto's ?
Many thanks in advance.
Regards
Steve Smith. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 756
Registered: 10-2004
|
| Posted on Friday, April 11, 2008 - 7:29 am: |
|
Hi Steve,
1. Sorry but not familiar with the MFA970 geared motor but as it uses a 540/1 motor is should be fine.
2. Whilst you can power the controller from a power supply, the power supply may well complain if the speed is rapidly reduced due to the regen currents.
3. Reversing contacts on the pot whilst the controller is running could not be recommended by us. Why not simply select option 3 for the analogue control and using your reversing relays and a resistor network, control the direction via S2 with the pot connected to S1.
4. The data sheet states the 5V output can supply 100mA if the motor supply is under 12V and only 10mA if over 12V. So in your case it would be 10mA. This is likely to be fine for CMOS logic but maybe pushing it for opto's. We do have a wide range of BEC's if you need the extra current and you cannot get away with a lower motor supply.
Regards
Paul |
Gary
Unregistered guest
|
| Posted on Saturday, April 12, 2008 - 6:40 pm: |
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Paul,
A few weeks ago I purchased a sabretooth 2x25 controller from you. I fitted it into my featherweight robot (hornet 2) a few days ago.
Today I was testing the electronics for the first time. The robot uses two 18v drill motors overvolted to 24v for drive and a 24v magmotor powered via large solid state relay which is in turn powered by a smaller battleswitch. I use two high current 12v nicad packs for power.
I tested the drive and disc with the electronics and all appeared to be well. I got through a full charge of my batteries which is around 10 minutes. I then charged the batteries again once they had cooled and put the removable link in. The robot began to uncontrollable rotate in circles outwith my control. I made a dive for the link and got it out. I then checked everything and it all seemed to be fine. I put the link back in and thick white smoke came out of the sabretooth from underneath the board (through the small holes on the board).
I haven't modified the board in any way apart from putting a small bit of araldite on the large capacitors to hold them firmly in place.
My question is, how do I go about getting a replacement sabretooth? I bought the controller on the understanding that it had current protection and would be a nice replacement to my processor controlled electronize I used previously. I ensured I wired the controller in correctly and didn't abuse it in any way so I believe that it is a manufacturing issue.
I look forward to your reply.
Regards
Gary Cairns |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 762
Registered: 10-2004
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| Posted on Monday, April 14, 2008 - 2:43 pm: |
|
Gary,
Yours would be the first actual failure of a Dimension Engineering controller since their launch on our site last year. Clearly the controller has failed and needs returning the USA for examination.
The controller does have current limiting but that does not mean it can guarantee current limit under all circumstances such as a motor short circuit. Also, current limiting should not really be used for a motor that can exceed the controller rating in normal use. We will need to know what the motors can draw under load.
The fact that you managed to go a 10 minute test suggest that something may have happened during the battery change-over. One thing that comes to mind is the battery voltage immediately following charging, whilst a 12V pack should not exceed 28V, it would be worth checking in case you are over-charging the batteries.
I trust there is no way you could have put a reverse battery supply on?
If you return it to us, we will get it sent straight back to the States for investigation.
Regards
Paul |
steve Smith
Unregistered guest
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| Posted on Saturday, April 12, 2008 - 11:00 pm: |
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Hi Paul,
Many thanks for your reply.
The MFA970 motor is very similar to the MFA919 motors you sell but with a planetary gearbox.
I've seen the spec sheet for the controller and now understand the S1 and S2 inputs, great.
As for the back EMF issue, what I'm proposing to do is run the controller from an 8Amp 12-15v supply, via a power blocking diode in the positive rail, and on the controller side put a large 8000uF to 10000uF capacitor across the controller to act like a battery.
I only plan to put the CMOS 4013 flip flop on the controller 5V output to control the S2 input as a toggle reverse function.
Thanks for your help, I've received the two controllers, so I'll have a play over the weekend.
Cheers,
Steve. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 763
Registered: 10-2004
|
| Posted on Monday, April 14, 2008 - 2:48 pm: |
|
Hi Steve,
That all sounds fine to me and the 4013 will not be a problem for the BEC.
Regards
Paul |
stewart badger
Unregistered guest
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| Posted on Wednesday, April 30, 2008 - 5:55 am: |
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Sabertooth Dual 10A Motor Controller for RC - im thinking of putting said item in a dual motor baitboat .can they be waterproofed also which motors you stock would you recommened. i would prefer 6 volt solution but would go 12 volt if needed .thanx |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 781
Registered: 10-2004
|
| Posted on Monday, May 5, 2008 - 6:37 pm: |
|
Stewart,
Our knowledge of boats is very limited. Can the controllers be waterproofed? not sure and they are not designed for it . I would put it inside an aluminium box for heatsinking and waterproof the box. the other option is to ensure the controller is run well within its limits so it does not get too hot and thus does not require heatsinking.
We do have a number of bait boat customers but as for a suitable motor, I would need to know rpm & torque to advise which is determined by your props.
Regards |
Keith Brook (Keithbrook)
Member
Username: Keithbrook
Post Number: 1
Registered: 8-2008
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| Posted on Monday, August 4, 2008 - 6:31 pm: |
|
Hi Folks
I'm experimenting with a Dimension Engineering 2x5 (which is fantastic) and discovered that it doesn't have feedback using the motor's back emf.
I think this can be done with an op-amp at the input and I was wondering if any of you lovely people have such a circuit.
Thanks
Keith |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 844
Registered: 10-2004
|
| Posted on Tuesday, August 5, 2008 - 10:19 pm: |
|
Keith,
Sorry but we have no experience of anyone having done this. Can you expand in a little more detail, maybe a simple block diagram and we will give some thought on it. |
Keith Brook (Keithbrook)
Member
Username: Keithbrook
Post Number: 2
Registered: 8-2008
|
| Posted on Wednesday, August 6, 2008 - 12:23 am: |
|
Hi
Thanks for the reply.
I've uploaded a data sheet to a website
basicversion.com/back-emf.pdf
which describes feedback from a 1 ohm resistor applied to the inverting input of an op-amp.
In this case, it's a power op-amp and so drives the motor directly. However, I was so impressed by the 2x5 that I'm sure the fundamentals of the feedback circuit will work with a cheap 741 applied to the input.
Unfortunately, I don't have the necessary skills. I'm quite handy and can build circuits, but I can't design.
So, back to you for assistance.
Many thanks
Keith |
Keith Brook (Keithbrook)
Member
Username: Keithbrook
Post Number: 3
Registered: 8-2008
|
| Posted on Saturday, August 9, 2008 - 11:34 am: |
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Hi
Has the trail gone cold on the hunt for a solution to my feedback problem?
Keith |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 847
Registered: 10-2004
|
| Posted on Saturday, August 9, 2008 - 12:37 pm: |
|
Keith, sorry we have been very busy the last few days. Are you intending to control the speedo with a control voltage rather than a radio control signal? Most basic speed controllers are simply voltage followers i.e. open loop control. Providing feedback to modify the speedo output would have to be done externally with the dimension engineering range of controllers. You could use an external opamp circuit with a tacho feedback or the sense resistor to modify your control signal could be done and that data sheet you linked to does descibe it in some detail.
We cannot devote the time to come up with a practical design for you but can confirm it is possible to achieve. you could always use a controller that has closed loop control features already built in i.e. see our products 1503-004, 1503-006.
Regards
Paul |
Darren Cooper (Sieg)
Member
Username: Sieg
Post Number: 1
Registered: 8-2008
|
| Posted on Thursday, August 14, 2008 - 6:03 pm: |
|
Can I disable the regenerative functinality in the 25 speed controller - I'm using a PSU and want to avoid putting a battery in parallel. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 850
Registered: 10-2004
|
| Posted on Monday, August 18, 2008 - 1:04 pm: |
|
Darren,
Not as far as we are aware. Depending on the power supply it may well have internal protection to prevent feedback. You could also put a suitably rated diode in the line between the power supply output and speedo. |
Herman v/d Meijs (Herman02)
Member
Username: Herman02
Post Number: 4
Registered: 12-2008
|
| Posted on Sunday, September 13, 2009 - 10:57 pm: |
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Hi
I bought the Syren 25 controller to control a 24V/250W motor. The motor is driving a movable platform, max current is 25A. In case something goes wrong, there are end-stop switches to switch off the motor immediately. The end-stop cannot handle the motor-current so they drive a automotive 40A relay.
My question is:
Can I wire the (breaking) relay-contact in series with the battery or motor terminals ?
Will it not destroy the Syren controller due to the dI/dt when switching off at full load?
Because the Syren can return power to the battery, I think it is better to break the motor circuit instead of the supply circuit. Are you agree with that ?
Regards
Herman |
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