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Author Topic: ALLEN BRADLEY 2090-UCSR-A300  (Read 1320 times)

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Offline fast89

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ALLEN BRADLEY 2090-UCSR-A300
« on: March 08, 2018, 06:16:16 PM »
Hello everybody,
I've got an Allen Bradley dsd-020 drive and motor as a spindle motor. Motor turns 5k and spindle turns 7500. It has quite a bit of regeneration when decelerating. I added an ALLEN BRADLEY 2090-UCSR-A300 shunt module. Well, i tried to anyway. I bought a used one on eBay and it wouldn't activate and the drive would get bus over voltage alarms. I tried turning the adjust screw all the way down but the shunt never activates. So i bought another one. Same thing. Am i missing something or have i just gotten two bad drives in a row now.

Offline fast89

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Re: ALLEN BRADLEY 2090-UCSR-A300
« Reply #1 on: March 08, 2018, 06:38:26 PM »
I meant to say bad shunt modules, the drive is fine.
Re: ALLEN BRADLEY 2090-UCSR-A300
« Reply #2 on: March 08, 2018, 06:42:37 PM »
Hi,
I have an identical drive for a 1.8kW servo used as spindle motor.

If I recall correctly the 050,010,020 and 030 drives are not fitted withe the switch which engages the
brake resistance. Again from memory the braking module for these drives has a switch (MOSFET/IGBT)
inside. If that is the case there is a distinct possibility that a module is faulty and with bad luck two faulty
modules is not impossible either, they are after all right at the business end and come under extreme stress.

I no longer have the manual but it is a free download from Rockwell Automation.

Craig
My wife left with my best friend...
     and I miss him!
Re: ALLEN BRADLEY 2090-UCSR-A300
« Reply #3 on: March 08, 2018, 07:12:00 PM »
Hi,
downloaded the manual and yes they are active. Do you have the line detect terminals populated, I rather think
they will be needed.

How do you feel about opening it up to have a look inside? I fix welding equipment, a lot of inverter stuff, for a living
and am quite used to inspecting/repairing switching circuits both single phase (320VDC Link) and three phase (585VDC Link)
and that's when the manufacturer is not using PFC boost.

If I recall your previous posts that you are Austrailian? Surely we can cooperate to fix it.

Craig
My wife left with my best friend...
     and I miss him!

Offline fast89

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Re: ALLEN BRADLEY 2090-UCSR-A300
« Reply #4 on: March 08, 2018, 07:24:24 PM »
Definitely have the ac line detect terminals wired. I read the manual too but no mention of what to do if the active light does not come on. They were both cheap so i don't mind opening up to fix.

Offline fast89

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Re: ALLEN BRADLEY 2090-UCSR-A300
« Reply #5 on: March 08, 2018, 07:32:23 PM »
Here is the inside
Re: ALLEN BRADLEY 2090-UCSR-A300
« Reply #6 on: March 08, 2018, 08:13:15 PM »
Hi,
lower right hand corner, the TO247 device, cant read it but guess is a MOSFET or IGBT. Not sure what the IC north
of that, logo =L, whats the part no.?

I would be testing the MOSFET/IGBT and make sure you have continuity through the resistor (the big one top
left).

Craig
My wife left with my best friend...
     and I miss him!
Re: ALLEN BRADLEY 2090-UCSR-A300
« Reply #7 on: March 09, 2018, 02:26:37 AM »
Hi,
have you considered making one? I think a working unit could be done pretty simply.

Craig
My wife left with my best friend...
     and I miss him!
Re: ALLEN BRADLEY 2090-UCSR-A300
« Reply #8 on: March 09, 2018, 03:58:36 AM »
Hi,
something like this.

Rectified and smoothed ACline for DCLink reference voltage. If the DCLink+ goes 24V (zener drop) higher then the opto LED conducts turning the shunt
MOSFET on. Cheap and cheerful gate drive powersupply with a little transformer, rectifier and filter cap.

Craig
My wife left with my best friend...
     and I miss him!
Re: ALLEN BRADLEY 2090-UCSR-A300
« Reply #9 on: March 09, 2018, 04:08:26 AM »
Hi,
that very simple idea might have a few weaknesses. What happens if the ACline voltage disappears while the DCLink holds up for a second or two.....
the LED of the opto looks like it could come under severe reverse bias...not a good look for an LED.

Some refinements are definitely in order. I might try making one to see how it pans out in practice.

Craig
My wife left with my best friend...
     and I miss him!