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[G120] SLS mode with CU240E-2DP-F

Created by: Guillaume MASSART at: 7/19/2013 2:44 PM (4 Replies)

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7/19/2013 2:44 PM	Rate (0)
Guillaume MASSART Posts: 3 Rating: (0)	Hello We want to use the SLS mode for safety reson to be sure that the speed will never go over a certain limit. This has to be used during a "JOG mode" of our machine. In this mode, we use buttons to move forward / backward our products inside the machine for some purposes. At the beginning we thought that we should use a safety relay to start the SLS mode and after that we could use our system as usual (push buttons to move forward when we need it) The problem is that there is this limit of 5s that will start an SS1/STO if the motor does not turn (1Hz) We wonder if : 1-it is possible to remove that 5s limit which is useless for us 2-it is acceptable to start the SLS mode only when we push the different buttons. Will this not create issues if for example a stupid operator push 10times /s the buttons ? Hope I am clear in my explanations Regards Guillaume
Guillaume MASSART Posts: 3 Rating: (0)
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7/22/2013 3:29 PM	Rate (0)
Technology Team Platinum Expert Joined: 10/11/2006 Last visit: 1/16/2026 Posts: 6068 Rating: (828)	Hello, please have a look in the safety integrated manual section 2.6 SLS: http://support.automation.siemens.com/WW/view/en/70235827This explains how theSLS works in detail. Additional, ensure, that the drive has ben commissioned properly.
	With best regards, Technology Team Application consulting and pre sales support for SINAMICS, SIMATIC Technology, SIMOTION, SIMOTICS and MOTION CONNECT
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7/22/2013 4:38 PM	Rate (0)
Guillaume MASSART Posts: 3 Rating: (0)	According to the behavior we look for, we have to follow :"Selecting SLS at low motor speeds" But my question is : if the SLS mode is activated / deactivated 1 time per second, can this create fault in the frequency converter or is it ok ? Our goal is as follow: Machine is stopped, the operator can use "forward / backward" command with push button Each time we push the buttons, the SLS mode is activated. As soon as the buttons are released, the SLS mode is deactivated. As you can imagine, an operator can do stupid things such as pushing the buttons as quickly as possible.... Regards Guillaume
Guillaume MASSART Posts: 3 Rating: (0)
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7/23/2013 10:36 AM	Rate (0)
Technology Team Platinum Expert Joined: 10/11/2006 Last visit: 1/16/2026 Posts: 6068 Rating: (828)	Hello, referring the SLS please get in touch with your Siemens contact. Depending on the way how the kind of Jog-mode is made, the power module is the limitating factor. If the power module is switched with each Jog order to the line supply the precharging unit will always come and will be bypassed. This will decrease the life time. For details, please contact your Siemens partner. If the line supply is allways connected to the power module this limitating woun't be happen. Never the less, the inverter has to bechoosen correctly.
	With best regards, Technology Team Application consulting and pre sales support for SINAMICS, SIMATIC Technology, SIMOTION, SIMOTICS and MOTION CONNECT
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7/23/2013 10:45 AM	Rate (0)
Guillaume MASSART Posts: 3 Rating: (0)	The G120 is always powered, we use the STO function to shut off the power in case of problem. The JOG mode is not used so often, 1 or 2 times a week, sometimes more. I got in touch with our SIEMENS hotline which got in touch with the german one who gives me the following links : http://support.automation.siemens.com/WW/view/de/62069920 The hotlines confirmed me the fact that activating the SLS mode so often is not a problem, the problem could come from the STO / SS1 which needs time before being removed. Here is the full message received : for failsafe operation mode we have a function example, which can be used for you application. In jog mode / failsafe operation mode you can have a look on the interconnections in chapter 3. http://support.automation.siemens.com/WW/view/de/62069920 If SLS is selected so often, there is no problem, but be careful that the time between SLS selection and SLS active should be nearly 0 seconds. This time can be parameterized in the Sinamics. As I understood, the SLS limit is very small and just for operation / jog mode. If SLS is statically active then it is allowed to select between 2 safety functions (STO and SLS) with a standard signal, like OFF1. But be careful, if STO is selected with this standard signal and at the same time the Sinamics should be switched on via OFF1, then you will have an deadlock, because after deselecting STO the Sinamics is not ready yet. So you need a time delay between STO deselection and switchting on. If for this machine also automatic or other modes are used then you have to check that the velocity of the drive does not exceed the SLS limit.
Guillaume MASSART Posts: 3 Rating: (0)
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