7/4/2019 2:56 PM | |
Posts: 5 Rating: (0) |
Hi everyone, i have a problem on three CU250S-2PN with extended safety card 6SL3054-4AG00-2AA0-Z F01. All three control units are equipped with power unit 6SL3210-1PE21-8UL0 and control a siemens motor 1PH8131-1ED02-1GD2. The motor encoder is connected via SMC20 module (6SL3055-0AA00-5BA3) to the control unit with drive clique. The problem is the following: in my application i need a safe speed feedback from the drive so i used the safe speed monitoring function (SSM) with a limit of 300 rpm ( see SSM parameters in attachment ). In the profisafe telegram i deselect the SLS and SDI functions (which i'm not interested in) and check only the SSM bit. The problem is that sometimes (randomly) the encoderless speed used for the safe speed function ( parameter r9714[0] ) starts taking random values (see video in attachment) and consequently the SSM bit starts flickering, while sometimes the calculated speed is correct and the SSM bit doesn't give any problem. The incorrect behaviour of the parameter parameter r9714[0] happens from the start of the motor and continues until the motor stops ( i tried running it for several minutes and the value r9714[0] keeps assuming wrong values, both positive and negative, until the motor is stopped ). The same is true if the value of r9714[0] is correct: the value is stying correct until the motor stops and the SSM bit is not giving any kind of problem. So the question is, does anyone have an idea about parameters i can change or tests i can do in order to solve this problem ? Any help would be greatly appriciated Regards, Lorenzo
Attachmentssm.zip (48 Downloads) |
7/4/2019 3:47 PM | |
Joined: 10/11/2006 Last visit: 9/18/2024 Posts: 5906 Rating: (804)
|
Hello, |
With best regards, |
|
7/4/2019 5:15 PM | |
Posts: 5 Rating: (0) |
Hi Technology Team, thanks for the suggestion but i checked my plc code and i give the OFF1 command to the drive only if read the ready to switch on bit from the drive status word, so that shouldn't be a problem. Regards Lorenzo
|
7/8/2019 8:22 AM | |
Posts: 5 Rating: (0) |
Something else i can try ? Lorenzo |
7/8/2019 10:06 AM | |
Joined: 10/11/2006 Last visit: 9/18/2024 Posts: 5906 Rating: (804)
|
Hello Lorenzo, such a specific behavior is hard to solve via the forum. I guess a service request to get in contact with the Siemens drive system experts is the best approach in this matter. http://www.siemens.com/automation/support-request |
With best regards, |
|
This contribution was helpful to1 thankful Users |
Follow us on