02-15-2022, 02:44 PM | #21 | |
Getting Wild
Join Date: May 2011
Location: Lantana, TX
Posts: 94
|
Re: 2021 icon i40 with Roy pow lithium battery locks up
Is there a way to release the brake after a lock up event without removing/dismounting the brake from the motor?
Thanks in advance. Trevor Quote:
|
|
Today | |
Sponsored Links
__________________
This advertising will not be shown in this way to registered members. Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum |
|
02-15-2022, 03:55 PM | #22 | |
Gone Wild
Join Date: Oct 2012
Location: SoCal
Posts: 671
|
Re: 2021 icon i40 with Roy pow lithium battery locks up
Quote:
https://buggiesgonewild.com/showpost...69&postcount=5 |
|
02-16-2022, 01:41 PM | #23 |
Not Yet Wild
Join Date: May 2021
Location: South Florida
Posts: 33
|
Re: 2021 icon i40 with Roy pow lithium battery locks up
Glad you are ok.
It is a seriously bad idea to run the EMB circuit through the BMS of a LiFePO4 battery, it is just plain dangerous. Not sure what access you would have in this particular battery, but it is a simple task (generally) to run the ground from the EMB circuit (isolate just that relay or do the entire chassis ground) to connect directly to the pack. If the BMS needs to intervene to stop an overcurrent issue, it needs to kill the motor, the rest of it is small beans. |
02-16-2022, 05:25 PM | #24 | |
Gone Wild
Join Date: Oct 2012
Location: SoCal
Posts: 671
|
Re: 2021 icon i40 with Roy pow lithium battery locks up
Quote:
I've never seen a RoyPow lithium pack up close but I had imagined there was just one output and the BMS determines if power flows or not? |
|
02-17-2022, 01:59 PM | #25 | |
Not Yet Wild
Join Date: May 2021
Location: South Florida
Posts: 33
|
Re: 2021 icon i40 with Roy pow lithium battery locks up
Quote:
I ended up building my own pack (16s, 4p) and I do not run a BMS at all on the load side. I use it solely for charging and balancing. The NEOS has a great set of configurable tools for managing overcurrent and low voltage situations (from a total voltage perspective at least) and that is honestly good enough for me. |
|
02-17-2022, 03:45 PM | #26 | |
Gone Wild
Join Date: Oct 2012
Location: SoCal
Posts: 671
|
Re: 2021 icon i40 with Roy pow lithium battery locks up
Quote:
It looks like one would need to just unscrew the top plate to access and yes they should be prismatic cells like you said. I remember reading that at one point. Why would you run the EMB ground to the battery ground though? I'd think you'd run the EMB positive to the pack bypassing the BMS? And wouldn't that prevent the EMB from ever engaging? |
|
02-17-2022, 04:25 PM | #27 | |
Not Yet Wild
Join Date: May 2021
Location: South Florida
Posts: 33
|
Re: 2021 icon i40 with Roy pow lithium battery locks up
Quote:
Inside, you will find that the BMS is inline with, and cuts power via the ground not the positive. Like this: |
|
02-17-2022, 06:51 PM | #28 |
Gone Wild
Join Date: Oct 2012
Location: SoCal
Posts: 671
|
Re: 2021 icon i40 with Roy pow lithium battery locks up
Ah I see what you're saying now. In layman's terms, when the BMS cuts power, it's basically pulling the negative terminal off the pack. And you're suggesting connecting the EMB somewhere inline where I pictured below so that it will remain powered in the event of a BMS issue. Right?
Doesn't that make the EMB always on? It seems like the best solution would be just hooking only the motor and charger somehow but keeping power to the controller. So when the BMS shuts down the primary load (motor) is disconnected. |
02-18-2022, 09:06 AM | #29 |
Not Yet Wild
Join Date: May 2021
Location: South Florida
Posts: 33
|
Re: 2021 icon i40 with Roy pow lithium battery locks up
Quote:
My initial thought was to isolate that circuit so only the ground to the relay / run/tow switch bypassed the BMS (as pictured in red), or to bypass the entire chassis wiring as you suggest since the load is still relatively small (shown in blue). So, not wiring the EMB to be constantly on, but providing an uninterruptible ground to the circuit one way or another. Trouble is, the more I look at this, the more it looks like the signal to the relay from the controller will still drop if the BMS cuts power to the the big cables as the controller ground will drop. I plan to work on mine this weekend in sort of the opposite fashion (I would like to get my chassis wiring (sans the EMB of course) on my BMS because the Daly Smart bluetooth functionality only activates when it detects load or charging) so, I will confirm that is the case. Otherwise, I think there are two ways around it for sure. 1 - Parking brake switch. Not as convenient for sure as the auto brake feature, but as long as you wire it to a pre-BMS ground, it would be an easy way to solve the problem (I would use a relay for good measure). The right switch, wouldn't even look too bad. 2 - Auxiliary relay. One that works in some set of conditions. So, if you say move the chassis wiring to be pre-BMS, you could have a relay wired so that if the power is on to the chassis the EMB is off. Or, if you added a speed sensor to the mix, it would be possible to simply not allow the EMB to engage if the cart is moving, but that one would require a bit of extra hardware. |
02-18-2022, 12:16 PM | #30 | |
Gone Wild
Join Date: Oct 2012
Location: SoCal
Posts: 671
|
Re: 2021 icon i40 with Roy pow lithium battery locks up
Quote:
I'd actually do 2 relays for redundancy and have them with basic logic where the keyswitch on + BMS off = EMB off. Otherwise, EMB = on, except the BMS/controller would work as normal turning the EMB on/off as needed. That way, in the event of a BMS event, the loss of power keeps the EMB on. Essentially turning the keyswitch into an auxiliary tow switch. |
|
Tags |
icon, lithium, wheels lock |
|
Thread Tools | |
Display Modes | |
|
Similar Threads | ||||
Thread | Forum | |||
New Icon with Lithium | Icon | |||
2021 EZGO L6 Speed Adjuistments via Bob Boyce and Lithium Battery Life | Lithium EZGO | |||
2021 S4 Lithium Charging | Electric EZGO | |||
Icon Lithium | Icon | |||
Buying a 2021 ICON i40l, any advice? | Icon |