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For Jamie - Micromaster with electric pot

I tested the resistance on the Bosch electric pot and this are the results:

------------------------------------------------------- Brown - grey = start ( 0 ) - stop ( 0 ) Brown - yellow = start ( 0 ) - stop ( 0 ) Brown - white = start ( 1,21 kOhm) - stop (2.09 kOhm) Brown - green = start ( 0 ) - stop ( 0 ) Brown - pink = start ( 1.19 kOhm ) - stop ( 1.19 kOhm )

-------------------------------------------------------- Grey - yellow = start (1,26 kOhm ) - stop (over 2 MOhm scale ) Grey - white = start (0) - stop (0) Grey - green = start (0) - stop (0) Grey - pink = start (0) - stop (0)

-------------------------------------------------------- Yellow - white = start (0) - stop (0) Yellow - green = start (0) - stop (1,26 kOhm but only when you press maximum throttle, there's no measurement in between) Yellow - pink = start (0) - stop (0)

-------------------------------------------------------- White - green = start (0) - stop (0) White - pink = start (2,21 kOhm ) - stop (1,32 kOhm)

--------------------------------------------------------

MM outputs:

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Bosch electric pot:

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Questions:

1.) Do i need to apply 5V to this electric pot or can i use it as standard pot?

2.) Which wires should i use and how to connect them ?

THANK YOU in advance !

Reply to
nescafe
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Please give the part Number of this POT so we can find the actual wiring data.

All you did was confused the hell out of me, mainly because you now have wire colors you didn't have before..

THe MicroMaster drive is a basic standard...

Jamie

Reply to
Jamie

-------------------------- If i got the right datasheet then this should be it. It has one pot with two switches inside.

------------------------------ White = middle line of the pot Brown = one end of the pot Pink = second end of the pot Green = kick down switch Grey = "idle" switch Yellow = common for both switches

-----------------------------

Kick down switch is used for full/maximum throttle mode so this should be our choice. But, when i look at resistance measurement then am not sure if the kick down is the best solution, because ( as far as I understand this ) kick down is activated on situations when you press throttle to the maximum (yellow - green wire ) but fast...

Reply to
nescafe

White to the speed command input of the MM #3. Brown to the 10 Volt pin on drive.. ##1 Pink to the 0 volt pin #2?

Note: if the drive kicks in at full speed at the start of the throttle, switch the brown and pink wire.

Yellow and Green wire is the drive run switch and closes when you apply throttle. These two wires are the run enable/start.. ##5 + ##9 to these two wires.

Looking at the wiring on the MM, it looks like you need to connect both pin 2 and pin 4 together, so to give the Analog input a common. This drive looks like it can do differential speed command..

Jamie

Reply to
Jamie

------------------ I have connected as you suggested but there's no change. I also try the 2 + 4 connection. Maybe this could be becuse of this:

brown - pink = start ( 1.19 kOhm ) - stop ( 1.19 kOhm ) white - brown = start ( 1,21 kOhm) - stop (2.09 kOhm) white - pink = start (2,21 kOhm ) - stop (1,32 kOhm)

According to this it looks like that the potmeter is 1,2kOhm and that he has one one more 1,2 Kohm connected in series with slider ( white wire ). If this is so then this pot uses very small current. If he works on 5V then the current is 4mA and if he uses 14V then current is around 11mA. Majbe i should put some voltage divider and then connect the wires to this divider ?

2.) I was thinking that i could also test the MM with normal 3 wire potentiometer before i get back to Bosch. Do i need to connect the start/stop in this case ?
Reply to
nescafe

I think you better get some one to help you. It seems like it is beyond you. I know what it suppose to do, and with the information you give me it should work! However, you seem to keep presenting different scenarios with your wire colors and it is getting confusing..

You need a hands on person to show you or do it for you.

Jamie.

Reply to
Jamie

I agree with you that it should work. This MM is used one but i dont think that there should be some problem in this part. All i can think of is the pot-meter. That's why i wrote that i will test it with basic one. I extend the cables from bosch pot with new cable so the colors are different one but nevertheless i connected as you wrote.

One more thing... I set one voltage divider on the 10V input of the MM so that output was 5V. I'v done this because the pot-meter should work on 5 or 14V but it's the same as it was on the 10V input.

I measured the voltage and current on 5HZ.

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Reply to
nescafe

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