Tell me about ...... block time.

[amigafan2003]

I've done a search but haven't found this answered......

I have a Lyen mini monster controller and I understand the principle of block time - i.e. it allows the motor to draw a higher amount of amperage than the programmed phase limit for x number of seconds. This can help with take offs etc. I currently have the value set to 0.1s - effectively off.

What I don't know is how is the block timer reset? I.e. it gets triggered but does easing off the throttle reset the timer? Or do you have to return it to zero? Say you're cruising along and hit an incline - do you get an amp spike then the block timer kicks in pegs the amps at the phase limit? What about a gust of wind?

[Jeremy Harris]

Essentially it works as you describe. It allows the current to exceed the current limit for the set period of time whenever the throttle is opened and the current rises. Closing the throttle effectively resets it. It pegs the current at the battery limit, not the phase limit, as the controller cannot accurately determine phase current, it just estimates it.

Be cautious of increasing the block time, as it is possible to cause two undesirable effects. The first is that increasing block time increases the time that excessive current can flow, so increasing the risk of failure. The second is that increasing the block time, with a low inductance/low resistance motor, increases the probability that the peak over-current trip circuit will operate, which shuts the controller down until the throttle is closed and reopened.

[neptronix]

Set it as low as possible for geared motors, imho.

[DAND214]

Set it as low as possible for geared motors, imho.

Now I heard differant. Down on the phase and up with BT.
I'm not saying I'm right or even close. So someone else chime in on this BT thread.

I want to know too!

Dan

[neptronix]

Sorry, but i don't agree. You'll realize the need the right ratio of phase - battery current when you start climbing hills and such. No need for a big burst of current from the start; i say just run the proper amount of current in the first place.

Block time ( theoretically ) gives you an initial kick of power when you hit the throttle to give you a snappy instant response. If you're running a very low amount of current normally, then this is cool. But when you want to run a high amount of current, it can be too much. On a geared motor, a big burst of torque from the start is not what you want - gears, sprockets, chains etc handle more torque the faster they spin. So pumping a big spike of power into a geared motor from a stall is a bad idea. A DD motor will tolerate it just fine.

Set it as low as possible for geared motors, imho.

Now I heard differant. Down on the phase and up with BT.
I'm not saying I'm right or even close. So someone else chime in on this BT thread.

I want to know too!

Dan

[amigafan2003]

Cool - thanks guys.

What I'm dealing with is that a strong head wind gust can drop me down from 25mph to 19 or 18 mph. I'm running 700 watts peak on a Bafang SWXB. I think I know the solution - more amps - but any more than 700 watts and it becomes hard to go easy on the throttle otherwise you feel the motor clutch "slip" when accelearating.

[neptronix]

Oh, in that case you need higher amps. A low battery amp to phase amp ratio could help you a lot in this case; say a 2.3:1 - 2.5:1 ratio.

The lower the phase to battery amp ratio, the lower you reduce the initial amount of torque. I like a 2.4:1 ratio on my MAC motor because it makes the torque curve rather flat and predictable. Most controllers are programmed for 3:1 because that is fine for DD motors. But for geared motors i think it is too much.

That is a rather small motor, so i say adjust the battery/phase amp ratio a bit and tune block time as low as possible.

Cool - thanks guys.

What I'm dealing with is that a strong head wind gust can drop me down from 25mph to 19 or 18 mph. I'm running 700 watts peak on a Bafang SWXB. I think I know the solution - more amps - but any more than 700 watts and it becomes hard to go easy on the throttle otherwise you feel the motor clutch "slip" when accelearating.

[amigafan2003]

I'm already at 1:1.3 ratio (9.5 battery amps to 12 phase amps - 15s lipo).

[neptronix]

Woah, that's quite a low ratio already!!

I think this is just a wimpy motor, dude. It's rated for 250w operation. I think it's time to upgrade to a MAC/BMC size motor!