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Old 11-27-2018, 03:13 PM   #21
Per Hansson
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Default Re: Mitsubishi Melservo MR-J2S-100A alarm: AL.E9

Hi, the ones I've seen have shown AL.E9 as first & only error AFAIK.
I work as a service technician, so I get called whenever the customers can't get the machines working again...
So far I've repaired quite a few of these and had 100% success so far, and no returns...
Actually I'm near Tampere sometimes for customers too (actually in Lempäälä) but not right now.
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Old 11-27-2018, 08:56 PM   #22
sam_sam_sam
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Default Re: Mitsubishi Melservo MR-J2S-100A alarm: AL.E9

Thank you for this posting I also repair servo drives I have had switching power supply problems from bad capacitor to bad switching regulator IC chips but have not yet seen this problem

Thanks again for sharing this post
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9 PC LCD Monitor
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10 Battery Charger Switching Power Supply for Power Tool
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25 Servo Drives 220/460 3 Phase
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These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
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All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
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Old 11-27-2018, 10:57 PM   #23
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Default Re: Mitsubishi Melservo MR-J2S-100A alarm: AL.E9

Quote:
Originally Posted by Per Hansson View Post
Hi, the ones I've seen have shown AL.E9 as first & only error AFAIK.
I work as a service technician, so I get called whenever the customers can't get the machines working again...
So far I've repaired quite a few of these and had 100% success so far, and no returns...
Actually I'm near Tampere sometimes for customers too (actually in Lempäälä) but not right now.
Thanks for the response. Nice to hear that the failure mode has been consistent.

We've luckily had spare units for the ones that have been acting up, but apparently this model is outdated and hard to get nowadays.

I'll order some optocouplers and will see if these can be brought back to life.
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Old 12-28-2018, 04:02 PM   #24
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Default Re: Mitsubishi Melservo MR-J2S-100A alarm: AL.E9

When I have done these drive before I have given them a recap and change the switching regulator ic chip and now when I do another one of these drive I will change the optic sensor and the surface mount capacitor as well

After reading your post

Last edited by sam_sam_sam; 12-28-2018 at 04:03 PM..
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Old 09-24-2019, 10:24 AM   #25
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Default Re: Mitsubishi Melservo MR-J2S-100A alarm: AL.E9

hi, I made the change of the caps, and the HCPL7800A, in the DC BUS marks me an output of 280 vcd, the equipment was already installed in the machine and I am still working.
Since I don't have 33uf caps, install some 47uf caps. they believe that for this reason I am giving a bus voltage of 280 vcd, the caps I use are low ESR
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Old 09-30-2019, 12:17 PM   #26
Per Hansson
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Default Re: Mitsubishi Melservo MR-J2S-100A alarm: AL.E9

The bus voltage depends on the incoming AC voltage.
If you measure 200VAC input then 280VDC bus voltage is normal.
Calculation: √2 x 200VAC = 282.8VDC.

If not and you believe you have a heat sensitive component then heat it up with a heatgun carefully and see if the voltage changes.
Or cool it down and see if the voltage changes.
This is the way I used to pinpoint that it was component O15 the HCPL-7800 that was the culprit as described here.
And yes, the servo might be sensitive to the value of the capacitor, especially capacitor C6.
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Old 01-15-2020, 03:38 AM   #27
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Thumbs up Re: Mitsubishi Melservo MR-J2S-100A alarm: AL.E9

Quote:
Originally Posted by Per Hansson View Post
Hi, these two caps came from a unit that otherwise is full of Nichicon caps:
Nichicon GQ, GU & PJ manufactured late 2001.
Got any idea what model they are? (See picture).

The 33µF cap has an ESR of 40 so it's in dire need of replacement
I could get it down to ca 5 by heating it with my iron, then matching the other cap...

Quote:
Originally Posted by Per Hansson View Post
I ordered the "A" version of the 7800 optocoupler linked above from Mouser, actually it was the only one in stock.
It worked a treat, the bus voltage reading is now correct
Thanks. I solved alarm E9 after replacing this IC.
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Old 03-28-2020, 05:54 PM   #28
fazal kareem
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Default Re: Mitsubishi Melservo MR-J2S-100A alarm: AL.E9

IF Driver Shows
AL.E9 change ic chip 7800 80% solved
AL.24 change module 50% solved
but
AL.30 ?
AL.17 ?
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