Author Topic: Battery power  (Read 1567 times)

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Offline John Candy

Re: Battery power
« Reply #30 on: Aug 21 2020 13:20 »
Quote
The charge socket and the toggle switch are mounted on a brass plate fixed to the copper smokebox, neither are insulated.  Should they be?

So long as the motor feed wires and all the other wiring connections are isolated from the mounting bracket there should be no problem.

Is the Rx antenna in contact with metal.....that would cause a reception problem as could close Rx proximity to the motor or ESC?

John.
My fellow Members, ask not what your Society can do for you, ask what you can do for your Society.

Offline Jon Nazareth

Re: Battery power
« Reply #31 on: Aug 21 2020 13:59 »
John
I'm returning the batteries and the charger to Strikalite for their attention.

Er, I have a receiver and a transmitter, that's all.  The antenna on the receiver is insulated and is located in the smokebox, the motor is in the firebox.  What's an ESC?

Jon

Offline John Branch

Re: Battery power
« Reply #32 on: Aug 21 2020 14:06 »
The esc is the electronic speed control. It gets its control input from the receiver, is connected to the power source and the motor.  Depending on the signal it gets from the receiver, the output to the motor goes up and down.  Often the 3-wire lead from the ESC carries a regulated 5.5 v feed to the receiver (the red and brown leads), whilst the white lead delivers the control signal in the other direction.
John

Offline John Candy

Re: Battery power
« Reply #33 on: Aug 21 2020 14:07 »
Jon,
ESC is electronic speed controller.
The ESC receives the signal from the receiver and controls motor direction and speed.
Some units combine the functions of Rx and ESC and it may be that yours is one of those.
It is not usually a good idea to have the antenna within a metal enclosure, since this reduces the strength of the signal and the range over which the Rx can can receive.
Regards,
John.
My fellow Members, ask not what your Society can do for you, ask what you can do for your Society.

Offline joewatt

Re: Battery power
« Reply #34 on: Aug 24 2020 20:53 »
Bit of a scare when I switched to 'charge' on my Prairie yesterday. A short circuit at the charging plug caused lots of smoke from the plastic on the plug and both ends of the battery. Am replacing the plug and battery pack - I can't trust the battery now it has severely over-heated, such that the plastic wrapping at both ends melted.
The cause was probably a failure within the charging plug. However, it is in the floor of the tender and I had not covered it since a rebuild, so it could have got water on the terminals when passing a wet plant!


Offline John Candy

Re: Battery power
« Reply #35 on: Aug 24 2020 23:56 »
Nasty!

If there was a short at the socket, the fuse should have blown ..... you do have a fuse on the +ve lead from the the cell pack?

John.
My fellow Members, ask not what your Society can do for you, ask what you can do for your Society.

Offline joewatt

Re: Battery power
« Reply #36 on: Aug 25 2020 12:16 »
I have an 'NA2 1.6 Amp" cut-out inline as per the 'Mac 5' circuit diagram. It might have functioned, but not in time to stop the damage. I'll see what happens when I fit a new battery pack and plug!!

Offline John Candy

Re: Battery power
« Reply #37 on: Aug 25 2020 12:40 »
I do use the thermal cutouts/trips but always have a fast-blow fuse as back-up in case of a major overload/fault.
I generally use a 5A or 7.5A fuse to back-up a 1.6A or 3A cutout. The thermal trips, I have read, operate at around twice their nominal rating and of course self-reset, so the overload will repeat itself ad infinitum....or until the battery is depleted or has burnt out.
Regards,
John.
My fellow Members, ask not what your Society can do for you, ask what you can do for your Society.

Offline Jon Nazareth

Re: Battery power
« Reply #38 on: Aug 29 2020 09:21 »
I sent my battery pack and charger back to Strikalite and by return of post, another set came back.  Re-fitted the batteries and re-soldered the wires back together and everything is working now.  Not sure about this ESC but all seems to be okay okay.

Jon