No power on Haas Y servo drive

[ostie01]

On a HAAS TM-1P, ( Y servo drive )Both leds are not illuminated, the green and red.
Removed the drive and did all the tests with a multimeter as ( the https://www.haascnc.com/service/tro.../servo-amplifier---troubleshooting-guide.html ) Hass troubleshoothing guide. Everything tests OK on the drive
Tested the servo cable and tested OK.
Tested the pins on the servo motor and no ground fault.
There is a red led on the main board (TC OK)
Switched cables between X and Y and alarm change from Y axis to X axis.
I don't know what to verify after that.

Thanks for any help

 

[Donkey Hotey]

To clarify: you switched ALL the wires between the X and Y and now the problem is on X? 162 amplifier fault originally? So we know it's isolated to that amplifier?

Don't know how much time you've had with Haas or if you have other machines but, they used to provide low voltage to each amplifier, the logic boards, etc. That was the low volt power supply. If you've gone through the long checklist of things to go wrong with the amplifier, most of them were based around that DC power supply working. Well, it's gone now so we can eliminate most of that.

To cut costs and internal wiring, the "smart amps" like yours did away with the DC power wiring and started generating low voltage internally from the 320V rails. The fact that your other amps are powered up suggests the 320V bus is fine and the amplifier is likely dead. There might be a fuse to check on the amplifier but, doubt that's the issue.

FYI: the current Haas policy (at least my HFO) is that if it's customer installed, there is no warranty. Of course I had an amplifier arrive with intermittent problems and got a shoulder shrug and "sorry." In my case, the one hour drive time and one hour minimum was almost as much as the amplifier so you decide if the labor cost is worth the risk of the amp being bad out of the box.

You probably knew all of this and were hoping for a miracle. I know the feeling.

 

[ostie01]

Thanks for the reply. I had to change the spindle drive 2 times, the first time, I called Haas, so they could send a tech. Same $100.00/hour for the ride and $150.00 when he was working on the machine (+ the price for the drive). The nearest dealer is 5 hours away, so the bill was astronomic. The second time, I changed it myself, cost me the price of the drive only but, no warranty
Now, I'm pretty sure the drive is OK but, not sure about the main board. Maybe I should disconnect every connector and check for bad traces or broken solders.
If the red LED would be on, I would know the drive is bad, but the green in not illuminated either.

 

[Donkey Hotey]

For diagnostic purposes, you can unplug the amplifier communication plugs and restart the machine. My guess is that the amplifiers wake up and do their self-diagnostics, even with the data cables unplugged. If that amplifier isn't waking up the way the others are, it's a goner.

The bigger question is: why have you also gone through two spindle drives? Is this machine on single phase power? Or a phase converter? I thought TM models had a servo amplifier to drive the spindle but, since you only have three in that picture, I'm guessing you have a Vector Drive machine then? That's an expensive replacement.

 

[ostie01]

We can't see the servo drive for the spindle, it is outside the picture. Same as the other axis, but it is 45 AMP.
I'll try with to unplug the communication cable and turn on the mill, will see.
Thanks again, Jeff.

 

[Donkey Hotey]

Please report back. I've experienced three failed servo drives over the years but, I'm new to failures on the smart amps. Not exactly sure what to expect in your case, except that they should all behave the same.

 

[ostie01]

Ok, removed the transmission cable from the Y axis and the state of the drive stay the same, no led, red and green.
Will call the reseller to buy a new drive.
Your help is really appreciated, Jeff

 

[Donkey Hotey]

To clarify: I was saying to take the cable off the other amplifiers too. So they would all have the same chance to start the same. I think an untethered amp will still light up like normal but, the dead one will remain so.

 

[ostie01]

To clarify: I was saying to take the cable off the other amplifiers too. So they would all have the same chance to start the same. I think an untethered amp will still light up like normal but, the dead one will remain so.

I'm curious to try that. Will do

 

[ostie01]

Unplug all cables like you said, and the 2 other drives were booting normally.
Installed a new drive and everything work great.
Thanks for your help. Jeff

 

[Donkey Hotey]

It's maddening how often these amps just decide to off themselves. My TL-1 had embarrassingly low hours (under a hundred?) when the X axis drive amp died. Not a slant bed machine. Zero load on the servos at rest. Just freaked out one day and started causing a once-per-revolution squeaking noise out of the axis motor (electrically caused from vibrating back & forth) and then errored out.

The original high volt DC power supply (same as your TM I believe) caused problems from day zero. Installed it and it popped a 50 amp breaker in the cabinet every time it was started. Went to a 60 amp breaker (single, split-phase). Same problem but, slightly less so. It took resetting the breaker 2-3x before the machine would start cleanly and then it was fine. Next time starting it, repeat the process. Haas said it was a problem with my panel or wiring.

About four months in, I start the machine and something exploded in the cabinet. Open it up and all of the smoke had left the DC power supply in a big hurry. Burn marks on the ventilation grills and you could see main traces blown loose from the board inside. Replaced under warranty and they were Johnny on the spot about it. No complaints there.

After that, never a problem from the power supply again. Startup problems vanished (hey! It wasn't the wiring after all!). It seems that whoever makes their electronics causes some really random quality issues. Was that a bad capacitor? A whisker causing intermittent shorts on the solder traces? I don't know.

 

[ostie01]

Mine is a 2011 model, so 12 years of good work. Haas did a great job to send me a new drive in only 2 days since I live in a rural area and most of Haas employees were on vacation, and they said the drive was out of stock.
Thanks again for your help.