sfuller94 (Customer) asked a question.
Sure Servo 2 AL003 Alarm
I have two SV2A-2150's connected as a Master-Slave. We have a test where we kill the input power while driving the motors to simulate a power outage. We wait 30s after the power has been removed and then restore power to the system. We wait another 30s and then through DI1, we reset the drives. The drive in the Slave configuration keeps throwing an AL003 fault. I've set P2.066P2 to 1 to depress the latching function but am still required to cycle power on that one drive to restore it to operation.
Any ideas? Hopefully this explanation is clear.
The Slave Drive throws the AL003 fault only when we reset/reenable the drive.
AL003 is under voltage, so it seems a bit weird to get that on power up especially when power has been off for 30 seconds so it isn't like the drive is reenergizing with partially charged capacitors.
The description for AL003 says it can be a warning about either incoming line AC or the DC bus voltage. Have you checked with a multimeter what your line voltage is at the drive input? It says P2.066.b2 to 1 will clear automatically when voltage is normal, so the fact it isnt clearing when you set this makes me lean towards an actual voltage problem either getting to the drive or in the bus capacitors.
If you set P0.002 to "14" it should show the DC bus voltage. If the incoming AC line voltage is all good and the bus voltage doesnt look right then it would probably be a drive hardware issue that needs replacing.
Have you tried using a DI for alarm reset and see if the undervoltage clears? Or is that what you meant with your DI1 after 30 seconds? Usually DI1 in most configs is the drive enable so that's what I was figuring.
We're using DI1 for enables only. I don't have an alarm clear line connected. I'm taking voltage measurements this afternoon. Thanks for replying!
This is happening more and more. If the power drops while the motors are actually enabled, the AL003 error stays resident and will not clear. In fact, I had the Servo2 Software up and connected to the motor controller and even the Servo2 software was not able to clear the alarm. I had to reset power to just that motor controller. One odd thing that I noticed was that when I reset the motor controller individually, the AL003 error code showed up, but when I heard a relay 'tick' then the alarm clears. We are using DI2 as the Alarm Reset and, just as with the Alarm Reset within the Servo2 software, it had no affect on the error.
I did pull up the monitor and after both motor controllers were powered, I could see the Bus Voltage was higher than the setting. But, when I enabled the motor controller, it activated the AL003 alarm. The buss voltage did not change. I could see the alarm in the Alarm Log and it would not allow me to clear it from the Alarm Log.
That is definitely some low voltage. Software shows you are at 164v and the drive should have 340v on the DC bus normally (240v AC line in * 1.414 = 340).
Are you trying to run the drive on a regular 120v wall outlet? Your voltage would make sense if the AC input was a bit low at 117 volts.
The undervoltage alarm set at "150" will report an undervoltage anytime the DC bus is less than 212 volts. If you are going to run the drive on a 120v outlet you should set P4.024 to 105.
I don't even know if you can run these servos on a 120v outlet? I thought the motor required a 240v input.
edit: It looks like you can run these new servo drives off a 120v outlet. That is really good to know. I always assumed they were like the old models and only ran on a 240v circuit.
Seems like the default value of the undervoltage error is set for 240v though, so when running on 120v you do need to manually turn that down so it doesnt throw an error.
That’s correct. We’re running this off of 120VAC standard wall voltage. The motors run fine on the 120VAC. I’ll adjust P4.024 to 105. That should clear it up! Thanks!
I've adjusted P4.024 down to 70 and I'm still getting the error. I'm beginning to wonder if the wall voltage we're running from is sagging. I'll take some measurements today.
More REALLY odd behavior. After a power off shut down, I logged back into the MC and brought up the Monitor and it stated the BUS voltage was VERY high. Attached is a picture of the Bus Voltage. The voltage slowly drifts downward. I can attest that when in this state, it will throw the AL003 error when I try to initialize the drive. It is very repetitive.
I wonder if the bus voltage is being increase because of this nature of fault? I do not have a regen/braking resistor on either MC. The speeds/accels are really slow (600r/min with a 200ms accel time). I wonder if this type of fault is pumping up the bus voltage and the value that we're seeing is real.
I've installed regen resistors on both of the motor controllers and the issue remains.
At this point I dont know what it could be other than a bad drive that needs replacing.
Maybe @ADC Community_02 (Automationdirect.com) will be able to help you more.