Hi-Power AWR Hotdriver...adjusting?

[SR.GRINGO]

So I have a new Hi Power AWR hotdriver that I want to use for a 5761. How do I go about adjusting this? I have searched and wondering if I am doing something wrong? My pack is 7.2 volts but highest output is 5.5 volts that I am reading on the fluke meter. This Hotdriver arrived preset at 11.1. The pack has plenty of power.

 

[LuxLuthor]

You just rotate those two adjustable pots. One is coarse and other fine. Put cut paper clips in bipin holes, and measure Vbulb after adjustments. The limit of voltage is really more a watt issue taking into account the dV of (Vbat-Vbulb) x Amps used, since that power must be absorbed by the FET. I have had AWR HD's running as much as 16.8V. There is also an issue with another feature which must be enabled/disabled, based on the current demand of the application...namely the "current limiter" circuit.

 

[JimmyM]

There's also another factor that may, but doesn't sound likely, is the low voltage cut off. If your voltage output is below 92% of the set voltage, it shuts down.
Can you try a lower draw bulb. If it came set at 11.1V, it sounds like it was set up for an 1185 bulb. That draws about 4.2A at 11.1V. Andrew may have set up current limiting for a value below the normal draw of the 5761. It might only take 5.5V into the 5761 to exceed the amp limit set in the Hotdriver.
By the way, how did you get a new one? I haven't gotten mine back from repair for almost a year now.

 

[SR.GRINGO]

Lux/JimmyM

Thanks will try some more tests with an 1185 and a 64430. I have a fm85 with three protected AW 17670....figuring I set the hotdriver to 10.0 volts for an Osram brand 64430....this won't have any negative effects correct?

Gringo

 

[LuxLuthor]

Lux/JimmyM

Thanks will try some more tests with an 1185 and a 64430. I have a fm85 with three protected AW 17670....figuring I set the hotdriver to 10.0 volts for an Osram brand 64430....this won't have any negative effects correct?

Gringo

This bulb does not do well above 9V. The static values I posted in my destructive testing thread here, does not tell the whole story, in terms of run time.

The other issue with the HD on this bulb, is it requires the "current limiting" feature to be disabled so you can get adequate Amps.

Basically above 5-6 Amps, you must disable CL feature and then calculate needed mOhm resistance, and implement using specific mm length & AWG wire guage (24AWG) going to bottom of switch spring that makes contact with Battery Positive contact.

 

[JimmyM]

As long as the current limiting point is above the normal running amps of the bulb, you should be OK. Unless it's a tenth or 2 over. It will draw out the start time. I was hoping to incorporate current limiting into my soft-starter or regulator. Forget "soft-starting" as a time based function. Limit current to 1 amp over normal running amps and let current limit that start time. Anyway, I digress. I think current limiting is stepping in and holding back your voltage so as not to exceed your current limit. I think AWR set the current limit for the 1185 and it's biting you when running a higher amp bulb.

 

[SR.GRINGO]

After digesting your responses, starting to think the WA1164 may be the way to go as it draws close to 4 amps. Where can I purchase these bulbs?