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Unread 10-01-2016, 06:58 AM   #21
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Default Re: Lester on board charger review

The purpose of the resistor is to provide +48v for the controller interlock input when the Lester charger interlock output is "floating" or NC (not connected).

One side of the resistor is connected to the Lester interlock Blue wire.

The other side of the resistor is connected to a +48v location that only gets power when the tow/run switch is on Run (like the hot side of key switch).
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Unread 10-01-2016, 07:35 AM   #22
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Default Re: Lester on board charger review

I reread your post #17 and everything you say makes sense. I will get the relay and resistor you linked and wire through the keyswitch as you suggest. I also got a small red LED button light for the dashboard which I will wire in to light up when the relay is activated so there won't be any doubt about why the cart won't run.

Thank you
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Unread 10-01-2016, 10:24 AM   #23
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Default Re: Lester on board charger review

The relay is the best option for controllers without a charger interlock input and the resistor is better for controllers with the interlock.

Keep us posted and thanks for doing all this research, testing and documenting it for the members
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Unread 10-01-2016, 10:53 AM   #24
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Default Re: Lester on board charger review

Quote:
Originally Posted by Sergio View Post
The relay is the best option for controllers without a charger interlock input and the resistor is better for controllers with the interlock.

Keep us posted and thanks for doing all this research, testing and documenting it for the members
I will post more when the parts come in and time allows. I couldn't do this without the help of experts like yourself - so, thanks for your help. More to come.
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Unread 10-05-2016, 07:20 PM   #25
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Default Re: Lester on board charger review

I got the parts Sergio suggested. Relay, resistor, 48v LED warning light. I think the resistor goes inline with the 48+ supply to the relay trigger..... but I asked Sergio to confirm
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Unread 10-05-2016, 07:45 PM   #26
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Default Re: Lester on board charger review

Quote:
Originally Posted by Sergio View Post
The purpose of the resistor is to provide +48v for the controller interlock input when the Lester charger interlock output is "floating" or NC (not connected).

One side of the resistor is connected to the Lester interlock Blue wire.

The other side of the resistor is connected to a +48v location that only gets power when the tow/run switch is on Run (like the hot side of key switch).
I'm confused on this too because I understand floating/NC is an alternate switch trigger to High/Low. And floating/NC means any current/no current
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Unread 10-05-2016, 08:06 PM   #27
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Default Re: Lester on board charger review

I did a quick sketch:

The first one is if Your controller has an Interlock input. This will probably be the case on most Sepex controllers.
The Resistor provides +48v logic signal to the controller when the Lester charger is turned OFF.
The second one is for carts where the controller does not have an interlock input. This will probably be the case on most Series carts.
The relay interrupts the key switch power if the key is Turned ON while the Lester is also ON.

You can optionally run the N.O. terminal of the Relay to a 48v buzzer or indicator light.
If You use a plain LED, use the 5.1kΩ x 1watt resistor inline to reduce the voltage at the LED.
The negative for the optional buzzer or LED should be directly to B- or pack negative, not the Lester interlock wire.
I hope this makes sense.
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Unread 10-05-2016, 08:53 PM   #28
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Default Re: Lester on board charger review

Thank you!

Processing ......
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Unread 10-05-2016, 09:30 PM   #29
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Default Re: Lester on board charger review

This is what I got from that.
Questions
What are the diode values?
Can I use my new 10kΩ resistor where you marked 5.1kΩ?
There was a circle & an arrow on the one diode which I don't know what that means?
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Unread 10-05-2016, 10:11 PM   #30
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Default Re: Lester on board charger review

The flyback diode is a plain 1N4004->1N4007:
http://www.mouser.com/ProductDetail/...Y4ludURuChfDtC
If Your indicator light or buzzer is rated for 48v, You can just connect it directly to the N.O. terminal of the Relay (no resistor needed).

If You are using a plain LED (that is the symbol for the LED), You need a current limiting resistor. The 10kΩ resistor will work as well, the LED will just be dimmer.
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