Storm 4 Xplore retrofit

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Re: Storm 4 Xplore retrofit

Postby Dan » 06 Jan 2022, 01:57

Normalish hands. My main profile is number 4.

You did the settings here.
https://www.wheelchairdriver.com/board/ ... ng#p119789

I have probably changed some settings since then but cant download from my joystick right now.
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Re: Storm 4 Xplore retrofit

Postby Burgerman » 06 Jan 2022, 02:31

That explains the turn acceleration scaler! I then reduced my turn acc and decel settings as a starting point for you. Same with forward accel and so on. And increased forward decel so it stops. That could be reduced some.
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Re: Storm 4 Xplore retrofit

Postby Burgerman » 06 Jan 2022, 02:31

That explains the turn acceleration scaler! I then reduced my turn acc and decel settings as a starting point for you. Same with forward accel and so on. And increased forward decel so it stops. That could be reduced some.
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Re: Storm 4 Xplore retrofit

Postby shirley_hkg » 06 Jan 2022, 06:55


Here is BM's preset.

Should I increase the TAS up ?
35% , and reduce the turn acceleration ?


Can't open Dan's file . Can you post a screenshot of it ?
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Screen 00149.jpg
Screen 00150.jpg
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Re: Storm 4 Xplore retrofit

Postby Burgerman » 06 Jan 2022, 07:12

I personally had turn acceleration set to max and turn deceleration set to max.
And it was still innacurate and steered like a drunk. cheers

So I left them that way, (I think 70 turn acc and 100 turn dec), and increased the turn accel scalar as well from 25 to 35 to get a faster response - meaning less delayed action. So it steers properly! Read dans explanation below.

The settings I sent dan for his chair which he liked are here. For his joystick though. https://www.wheelchairdriver.com/board/ ... ng#p119803
NOTE: I ONLY CHANGED PROFILE 4! And the scaler.

Well I have covered about 50 miles with the new settings, maybe 30 on the open road and 20 around cities. What an improvement! Especially on pavements dodging old people.
Before the chair would lunge around, then you would over correct trying not to hit anything. Now the control is much more direct, just as important it also stops when you stop turning, it also feels a lot smoother, it goes where you point it without the chair dancing around like it's possessed. Before the braking was insane, when I moved the joystick back even a little it would brake so hard the wheels could lock. Braking is a lot smoother now and you can still get an emergency stop by pulling back on the joystick. I can still go up and down curbs and I have never met a ramp that I could not go up or down.

I have not had any cutouts or overheating and the batteries seem to be holding up like normal.
Thanks for your help Burgerman, I am in your debt.
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Re: Storm 4 Xplore retrofit

Postby shirley_hkg » 18 Jan 2022, 12:04


Reprogrammed the chair today , not aggressively at all. Problem persisted , stopped while rolling slowly.

Right RED light blinking , with (SPANNER 1) on display.

Do I have a "left motor fault " ?
Any thought ? :worship
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Re: Storm 4 Xplore retrofit

Postby Burgerman » 18 Jan 2022, 12:15

I dont think so. Did you attempt to turn left or right indoors a couple of times right before this stopped?

You might disconnect the motor connector, spray switchcleaner and reassemble.
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Re: Storm 4 Xplore retrofit

Postby woodygb » 18 Jan 2022, 12:31

Hmmmm ... Here is a complete guess on my part.

Have you got a voltage leak / connection to the chairs frame? ... It might be worth a check with a multimeter.

IF you have , then try disconnecting components till it vanishes.
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Re: Storm 4 Xplore retrofit

Postby rover220 » 18 Jan 2022, 13:02

I've seen these before on a dxgb storm 4. Unmount pm and all OK but as soon as mounted to chassis it through up this fault. Ended up mounting pm on rubber to isolate it from chassis.
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Re: Storm 4 Xplore retrofit

Postby Burgerman » 18 Jan 2022, 13:24

If thats the case then something in the power module must be touching the shell/casing. And thats not supposed to be happening. It could be dirt or water in a motor or motor connector? With a leak to ground.
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Re: Storm 4 Xplore retrofit

Postby shirley_hkg » 18 Jan 2022, 13:38

woodygb wrote:Hmmmm ... Here is a complete guess on my part.

Have you got a voltage leak / connection to the chairs frame? ... It might be worth a check with a multimeter.

IF you have , then try disconnecting components till it vanishes.


rover220 wrote:I've seen these before on a dxgb storm 4. Unmount pm and all OK but as soon as mounted to chassis it through up this fault. Ended up mounting pm on rubber to isolate it from chassis.



I've thought of static charge as well. I dropped a wire on ground to discharge it. Didn't help.

Rover , did you recall you need nylon bolts to secure PM to the mounting plate ?

I want to try your way first , and will also measure any voltage on frame as woodygb advised .

John, it stopped in all circumstances, except abrupt movement. cheers
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Re: Storm 4 Xplore retrofit

Postby Burgerman » 18 Jan 2022, 13:42

Take a multimeter.

Measure resistance and voltage from frame to pos and neg on battery. Do the same on motors. With and without connection. There shoud be almost infinite resistance between the 24V or 0V from battery and the frame, motors, power module.
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Re: Storm 4 Xplore retrofit

Postby shirley_hkg » 18 Jan 2022, 14:42

MOTOR.
Do you mean its housing ?
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Re: Storm 4 Xplore retrofit

Postby Burgerman » 18 Jan 2022, 14:51

Yes. The housing should be isolated from the pos/neg. And from all the sensor wires.

And the frame. The resistance reading should be very high. Open circuit.
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Re: Storm 4 Xplore retrofit

Postby shirley_hkg » 18 Jan 2022, 16:22

Instead of battery terminals, can I tap at the charge port ?
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Re: Storm 4 Xplore retrofit

Postby woodygb » 18 Jan 2022, 16:47

Yes.
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Re: Storm 4 Xplore retrofit

Postby rover220 » 19 Jan 2022, 04:48

Burgerman wrote:If thats the case then something in the power module must be touching the shell/casing. And thats not supposed to be happening. It could be dirt or water in a motor or motor connector? With a leak to ground.


On the chair in question I think it was a motor issue, I tried 3 refurbished power modules and all did the same until I twigged what was happening. Chair user is a member on here.
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Re: Storm 4 Xplore retrofit

Postby shirley_hkg » 19 Jan 2022, 11:30


OK. Here are what I got today.

(+) … (-) → 25.54V
(+) … Chasis →25.54V
(-) … Chasis →31KΩ

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Re: Storm 4 Xplore retrofit

Postby Burgerman » 19 Jan 2022, 11:35

31k is a little lower resistace than I expected. But not enough to cause a problem I think? So thats not it...
But chassis to plus should not show battery volts. It might show some, but should be less than battery volts.


While measuring this resistance to frame, from plus/minus you can try the following. Disconnect the right motor connector at the motor end. And then the left. Does the resistance of your suspected bad motor make a big difference? Compared to the other one?

Then on the MOTOR with the power plug disconnected. Measure resistance from each motor sensor wire to the metal case. Should also be extremely high.


OK. Here are what I got today.

(+) … (-) → 25.54V expected
(+) … Chasis →25.54V unexpected would expect almost nothing or at least less than batt voltage. What was minus to frame? Should be the same as plus to frame...
(-) … Chasis →31KΩ lower than expected, what was PLUS to frame??? Should be identical really. This may be a motor leakage to the casing.
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Re: Storm 4 Xplore retrofit

Postby shirley_hkg » 19 Jan 2022, 12:10

shirley_hkg wrote:
OK. Here are what I got today.

(+) … (-) → 25.54V
(+) … Chasis →25.54V
(-) … Chasis →31KΩ



Chair was not turned ON yet.
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Re: Storm 4 Xplore retrofit

Postby Burgerman » 19 Jan 2022, 12:13

Yes thats fine. It should not be.
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Re: Storm 4 Xplore retrofit

Postby LROBBINS » 19 Jan 2022, 14:21

31k seems more like "leakage" than a short. With 31k from B- to chassis, a small current (ca. 0.07 mA) can flow from B+, enough for a high input impedance voltmeter to show a value for B+. What voltage do you read chassis--B+ if you put a pull-down resistor (for example, 1k) between your voltmeter leads? I'll bet it falls to near 0.
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Re: Storm 4 Xplore retrofit

Postby Burgerman » 19 Jan 2022, 16:25

But it may be enough to pull down a motor sensor for the brushless motor to an intermittently non readable value? Hence the following:

While measuring this resistance to frame, from plus/minus you can try the following. Disconnect the right motor connector at the motor end. And then the left. Does the resistance of your suspected bad motor make a big difference? Compared to the other one?

Then on the MOTOR with the power plug disconnected. Measure resistance from each motor sensor wire to the metal case. Should also be extremely high.


Could be as simple as some water in the motor connector plug shell at 31k.. or motor. But may affect hall effect sensor readings by the power module.
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Re: Storm 4 Xplore retrofit

Postby shirley_hkg » 26 Jan 2022, 13:23


Put the probes on (+) and chassis and read 25V.

Disconnect the follows one by one,
light plugs,
left motor connections
right motor connections .

Volt stays on all the way.
Put back everything. Now I get another error, (SPANNER 3 on power up).

European model seems more complex than the US one . :fencing
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Re: Storm 4 Xplore retrofit

Postby Burgerman » 26 Jan 2022, 13:33

Do it again and put 1k resistor between probes.
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Re: Storm 4 Xplore retrofit

Postby rover220 » 26 Jan 2022, 15:13

3 flash is a motor issue.
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Re: Storm 4 Xplore retrofit

Postby wheelchairer » 24 Aug 2022, 18:11

I have taken the bar off the front of the seat upon which is mounted the swing away foot rests. This allowed me to slide back the seat further 3 inches. In comparison to the wheel hub, the seat on this storm 4 X-plore is not dissimilar to my BM clone in positioning.

This will be a third chair. I'm looking to adapt and refit that bar, and then trying to modify the standard foot rests to fit.

Did anybody come up with a central footplate solution? Pictures a new phone would be great if you have. :worship
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Tom BM clone needs 8mph linix, R-net odyssey batteries
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Re: Storm 4 Xplore retrofit

Postby wheelchairer » 24 Aug 2022, 18:17

rover220 wrote:3 flash is a motor issue.
do you know what 2 flash (the green light in the key symbol on the joystick POD is flashing twice.)
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Re: Storm 4 Xplore retrofit

Postby Burgerman » 24 Aug 2022, 22:24

Locked?
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Re: Storm 4 Xplore retrofit

Postby rover220 » 25 Aug 2022, 06:44

wheelchairer wrote:
rover220 wrote:3 flash is a motor issue.
do you know what 2 flash (the green light in the key symbol on the joystick POD is flashing twice.)


Usually means a drive inhibit so check seat lift/tilt.
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