adccommunitymod (AutomationDirect) asked a question.
Created Date: March 24,2015
Created By: Sawyer
**** This post has been imported from our legacy forum. Information in this post may be outdated and links contained in the post may no longer work.****
I have a strange occurrence. I am wired per the attached pic. SureServo drive is set to run the HOMING routine at power-up. If I kill the power to the machine, the ON,OFF, E-STOP unlatches as it should. Now, if I power up within a minute or 2, the motors HOME immediately with the contactors OPEN, then the motor is free wheeling until the START circuit is latched, then they lock up .. usually out of position. The Control Circuit is always powered as in the pic. I suppose this is where it is initiating the homing routine upon power-up. I realize it is probably running on the residual power from the caps but would think that there would be a Servo Ready signal of sorts required before the HOMING starts. :confused: Maybe I need to utilize the ENABLE on a DI. ? I did not try it Disabled. If I power down then wait a few minutes till the drives bleed completely down, then nothing happen at power-up and the HOMING starts as it should when the START circuit gets latched. I have 2 main problems with this. 1. Once it homes abnormally, and motor goes free, it can (and usually does) move out of position and I loose the DO for In Position. And 2, I am not configured to re-home after the START is latched. Not really safe either .... for ANYTHING to be moving while the main contactor is open. Really surprised me. Can you tell me if this is normal ? I would like for it to Home at power-up but ONLY when the START circuit is latched if possible. Otherwise, I need to make everyone aware. Or, should a bleeder be implemented ? If so, what method would be used. And finally, did I possibly miss a parameter setting for this somewhere? Thanks,
Created Date: March 24,2015
Created by: scott.lawrence
check P1-47, more specifically, trigger source (third digit). If set to 1, it will home on power-up.
Created Date: March 24,2015
Created by: Sawyer
I have a strange occurrence.
SureServo drive is set to run the HOMING routine at power-up.
Thanks,
Yes, that is what I have done.
Thanks
:cool:
Created Date: March 24,2015
Created by: scott.lawrence
utilize an Enable input. This will keep the drive from moving until you want it to.
In the case of rapid power up/power off, you may want to change that homing routine. You could set it up so that the motors automatically home after a start-up delay, or with an operator push button.
Created Date: March 24,2015
Created by: Sawyer
Thanks Scott.
I just realized that there is a spare F button on the Text Panel.
I might just set that up to do the trigger with modbus and an I/O mask.
Cheers
Created Date: March 24,2015
Created by: kewakl
Another thought is to use the SERVO READY bit AND the "F " button.
That way the program can have a small amount of info concerning the status of the drive.
Created Date: March 24,2015
Created by: Sawyer
I have a strange occurrence.
I am wired per the attached pic.
SureServo drive is set to run the HOMING routine at power-up.
If I kill the power to the machine, the ON,OFF, E-STOP unlatches as it should.
Now, if I power up within a minute or 2, the motors HOME immediately with the contactors OPEN, then the motor is free wheeling until the START circuit is latched, then they lock up .. usually out of position.
The Control Circuit is always powered as in the pic. I suppose this is where it is initiating the homing routine upon power-up.
I realize it is probably running on the residual power from the caps but would think that there would be a Servo Ready signal of sorts required before the HOMING starts. :confused:
Maybe I need to utilize the ENABLE on a DI. ? I did not try it Disabled.
If I power down then wait a few minutes till the drives bleed completely down, then nothing happen at power-up and the HOMING starts as it should when the START circuit gets latched.
I have 2 main problems with this.
1. Once it homes abnormally, and motor goes free, it can (and usually does) move out of position and I loose the DO for In Position. And 2, I am not configured to re-home after the START is latched.
Not really safe either .... for ANYTHING to be moving while the main contactor is open.
Really surprised me.
Can you tell me if this is normal ?
I would like for it to Home at power-up but ONLY when the START circuit is latched if possible. Otherwise, I need to make everyone aware. Or, should a bleeder be implemented ? If so, what method would be used.
And finally, did I possibly miss a parameter setting for this somewhere?
Thanks,