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Discussion Starter · ·
I have been wondering about the relationships between the LBV, LBVI
and battery current limit.

I have my current limit set to 400 amps, and I think LBV at 125 and
LBVI at 129 or some combination close to that. (Now in vehicle
revision 2 these are linked to the check engine and battery lights on
my stock dash, but I digress)

Going up the hill at the end of my commute, have to slow to a crawl
(25 mph when limit is 50).

Current is limited way lower than 400 amps and while my battery
indicator lights, I don't get down to the 125 volt limit.

Does the zilla have logic that limits current before voltage drops to
the LBV limit?

John

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Discussion Starter · ·
John,
either you are pulling 400 amps going up that hill, or you batteries are
putting out the most they can at 125V for their state of charge. Can you
comment on SOC of the batteries when trying to pull the hill?

The LBVI is the setting that the indicator will come on. LBV is the limit
the Zilla will not pull the batteries below. However if the batteries are
low on charge, then at 125V they may only be able to put out something less
than 400 amps.

What kind of batteries and what nominal pack voltage?

Mike

John O'Connor <[email protected]>wrote:

> I have been wondering about the relationships between the LBV, LBVI
> and battery current limit.
>
> I have my current limit set to 400 amps, and I think LBV at 125 and
> LBVI at 129 or some combination close to that. (Now in vehicle
> revision 2 these are linked to the check engine and battery lights on
> my stock dash, but I digress)
>
> Going up the hill at the end of my commute, have to slow to a crawl
> (25 mph when limit is 50).
>
> Current is limited way lower than 400 amps and while my battery
> indicator lights, I don't get down to the 125 volt limit.
>
> Does the zilla have logic that limits current before voltage drops to
> the LBV limit?
>
> John
>
> _______________________________________________
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#### EVDL List

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Discussion Starter · ·
I have a 144 volt nominal pack of floodies.

I wish I could comment on their state of charge but I'm never quite sure what it it. I installed a fancy digital multiple-measurement instrument but I do not have it calibrated.

What puzzles me is that even if I am almost 100% discharged (0 SOC) at say 200 amps, shouldn't the zilla be discharging to the point voltage sags to the LBV setting?

That scenario has never happened on the few trips with the new instrumentation or last year when I had all analog instruments.

In other words I do not seem to be hitting either of the limits and I am still short power.

I think I just typed myself into an answer, Insufficient cooling. I had some air in my cooling system so I may have been thermally limited.

John

Mike Willmon <[email protected]> wrote:

> John,
> either you are pulling 400 amps going up that hill, or you batteries are
> putting out the most they can at 125V for their state of charge. Can you
> comment on SOC of the batteries when trying to pull the hill?
>
> The LBVI is the setting that the indicator will come on. LBV is the limit
> the Zilla will not pull the batteries below. However if the batteries are
> low on charge, then at 125V they may only be able to put out something less
> than 400 amps.
>
> What kind of batteries and what nominal pack voltage?
>
> Mike
>
> On Mon, Sep 27, 2010 at 3:50 PM, John O'Connor <[email protected]>wrote:
>
>> I have been wondering about the relationships between the LBV, LBVI
>> and battery current limit.
>>
>> I have my current limit set to 400 amps, and I think LBV at 125 and
>> LBVI at 129 or some combination close to that. (Now in vehicle
>> revision 2 these are linked to the check engine and battery lights on
>> my stock dash, but I digress)
>>
>> Going up the hill at the end of my commute, have to slow to a crawl
>> (25 mph when limit is 50).
>>
>> Current is limited way lower than 400 amps and while my battery
>> indicator lights, I don't get down to the 125 volt limit.
>>
>> Does the zilla have logic that limits current before voltage drops to
>> the LBV limit?
>>
>> John

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#### EVDL List

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Discussion Starter · ·
Hi John,

are you in a low gear or a high gear at 25mph?

it could be the zilla is operating in motor current limit, or, the back emf
at the motor = pack voltage, meaning the zilla is already operating full on.

Matt
----- Original Message -----
From: "John" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Tuesday, September 28, 2010 10:37 AM
Subject: Re: [EVDL] Zilla voltage setting question

>I have a 144 volt nominal pack of floodies.
>
> I wish I could comment on their state of charge but I'm never quite sure
> what it it. I installed a fancy digital multiple-measurement instrument
> but I do not have it calibrated.
>
> What puzzles me is that even if I am almost 100% discharged (0 SOC) at say
> 200 amps, shouldn't the zilla be discharging to the point voltage sags to
> the LBV setting?
>
> That scenario has never happened on the few trips with the new
>
> In other words I do not seem to be hitting either of the limits and I am
> still short power.
>
> I think I just typed myself into an answer, Insufficient cooling. I had
> some air in my cooling system so I may have been thermally limited.
>
> John
>
>
>
>
Mike Willmon <[email protected]> wrote:
>
>> John,
>> either you are pulling 400 amps going up that hill, or you batteries are
>> putting out the most they can at 125V for their state of charge. Can
>> you
>> comment on SOC of the batteries when trying to pull the hill?
>>
>> The LBVI is the setting that the indicator will come on. LBV is the
>> limit
>> the Zilla will not pull the batteries below. However if the batteries
>> are
>> low on charge, then at 125V they may only be able to put out something
>> less
>> than 400 amps.
>>
>> What kind of batteries and what nominal pack voltage?
>>
>> Mike
>>
>> On Mon, Sep 27, 2010 at 3:50 PM, John O'Connor
>> <[email protected]>wrote:
>>
>>> I have been wondering about the relationships between the LBV, LBVI
>>> and battery current limit.
>>>
>>> I have my current limit set to 400 amps, and I think LBV at 125 and
>>> LBVI at 129 or some combination close to that. (Now in vehicle
>>> revision 2 these are linked to the check engine and battery lights on
>>> my stock dash, but I digress)
>>>
>>> Going up the hill at the end of my commute, have to slow to a crawl
>>> (25 mph when limit is 50).
>>>
>>> Current is limited way lower than 400 amps and while my battery
>>> indicator lights, I don't get down to the 125 volt limit.
>>>
>>> Does the zilla have logic that limits current before voltage drops to
>>> the LBV limit?
>>>
>>> John
>
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#### EVDL List

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Discussion Starter · ·
Hi John,

Do you have *battery* current limit set to 400A
You may want to crank your motor current limit to
1000 or more, so that it can develop the torque
to get you up the hill.
(The controller can turn 144V 300A into for example
40V 1000A for the motor to run slower with lots
of torque)
BTW, which gear are you using to get up the hill?
I hope you are not lugging the motor.
If the battery stays above 125V then that is not
your problem, it is more likely a configuration
or operator error ;-)

Regards,

Cor van de Water
Director HW & Systems Architecture Group
Proxim Wireless Corporation http://www.proxim.com
Email: [email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: [email protected]
Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040)23117400 x203 XoIP: +31877841130

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of John O'Connor
Sent: Tuesday, September 28, 2010 4:21 AM
To: Electric Vehicle Discussion List
Subject: [EVDL] Zilla voltage setting question

I have been wondering about the relationships between the LBV, LBVI and
battery current limit.

I have my current limit set to 400 amps, and I think LBV at 125 and LBVI
at 129 or some combination close to that. (Now in vehicle revision 2
these are linked to the check engine and battery lights on my stock
dash, but I digress)

Going up the hill at the end of my commute, have to slow to a crawl
(25 mph when limit is 50).

Current is limited way lower than 400 amps and while my battery
indicator lights, I don't get down to the 125 volt limit.

Does the zilla have logic that limits current before voltage drops to
the LBV limit?

John

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#### EVDL List

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70 Posts
Discussion Starter · ·
Undoubtedly operator error of some sort

I am in 1st and/or 2nd gear when it happens, and I can check again but I believe motor current is set at 800 or 1000.

If I did my calculations correct 25 mph in 1st in between 4 and 5 k rmp (sure would have been nice to get that zolax centered, then I would know for sure.

Thanks for the suggestions everyone.

John

"Cor van de Water" <[email protected]> wrote:

> Hi John,
>
> Do you have *battery* current limit set to 400A
> not your *motor* current limit?
> You may want to crank your motor current limit to
> 1000 or more, so that it can develop the torque
> to get you up the hill.
> (The controller can turn 144V 300A into for example
> 40V 1000A for the motor to run slower with lots
> of torque)
> BTW, which gear are you using to get up the hill?
> I hope you are not lugging the motor.
> If the battery stays above 125V then that is not
> your problem, it is more likely a configuration
> or operator error ;-)
>
> Regards,
>
> Cor van de Water
> Director HW & Systems Architecture Group
> Proxim Wireless Corporation http://www.proxim.com
> Email: [email protected] Private: http://www.cvandewater.com
> Skype: cor_van_de_water IM: [email protected]
> Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
> Tel: +91 (040)23117400 x203 XoIP: +31877841130
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
> Behalf Of John O'Connor
> Sent: Tuesday, September 28, 2010 4:21 AM
> To: Electric Vehicle Discussion List
> Subject: [EVDL] Zilla voltage setting question
>
> I have been wondering about the relationships between the LBV, LBVI and
> battery current limit.
>
> I have my current limit set to 400 amps, and I think LBV at 125 and LBVI
> at 129 or some combination close to that. (Now in vehicle revision 2
> these are linked to the check engine and battery lights on my stock
> dash, but I digress)
>
> Going up the hill at the end of my commute, have to slow to a crawl
> (25 mph when limit is 50).
>
> Current is limited way lower than 400 amps and while my battery
> indicator lights, I don't get down to the 125 volt limit.
>
> Does the zilla have logic that limits current before voltage drops to
> the LBV limit?
>
> John
>
> _______________________________________________
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>
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#### EVDL List

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70 Posts
Discussion Starter · ·
The Zilla LBV may limit up to 10V high. At lower voltage packs this makes a
difference.

The best way to know what limit is active:
http://cafeelectric.com/Sfaq.php
and click on "The car won't start or runs slowly. How to use the DAQ?"

Overheat would flash the check engine light.

Sorry for minimal typing, bike wreck has me at left hand only.

-----
-Otmar-

http://cafeelectric.com/

914 EV, California Poppy, Zilla research vehicle.
http://evcl.com/914/

Zilla Support:
http://cafeelectric.com/Ssupport.php
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#### EVDL List

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Discussion Starter · ·
Thanks,

I think that 10 volts is what I am seeing.

On recent trips, when I had air in my coolant, I was getting the blinking overheat, but I was seeing the same 10 volt issue before getting to hot.

Finally got all the air out of my cooling system, and my batteries look to be getting back in shape.

It's good to see posts from you, hope you can find a suitable partner for the Zilla.

John

Otmar <[email protected]> wrote:

>
> The Zilla LBV may limit up to 10V high. At lower voltage packs this makes a
> difference.
>
> The best way to know what limit is active:
> http://cafeelectric.com/Sfaq.php
> and click on "The car won't start or runs slowly. How to use the DAQ?"
>
> Overheat would flash the check engine light.
>
> Sorry for minimal typing, bike wreck has me at left hand only.
>
> -----
> -Otmar-
>
> http://cafeelectric.com/
>
> 914 EV, California Poppy, Zilla research vehicle.
> http://evcl.com/914/
>
> Zilla Support:
> http://cafeelectric.com/Ssupport.php
> --
> View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/Zilla-voltage-setting-question-tp2716359p2718283.html
> Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com.
>
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