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11/23/2009 7:25 PM | |
Posts: 1 Rating: (0) |
Hi, we build machines with 3RTx type contactors as multipliers for safety relais' outputs. So far so good - as DIN EN 954-1 was concerned. We often have machines with 5 to 10 sec. cycle time --> so the 3RTx contactors have to prevent dangerous movements everey 5 to 10 sec. Following the introduction of the B10-values of DIN EN ISO 13849 we have problems: Using 3RTx contactors (as well as competitors products) the contactors had to be preventively replaced about every 1.5 years, which is quite unacceptable for our customers. While the problem is not so obvious using calculations by the siemens safety tool (which seems to "ignore" the fact that a prerequisite of calculation according to ISO 13849) a fact is is that you had to replace safey components such as contactors after the time T10 defined by B10 value has been consumed. Any suggestions for switching especially inductive loads ín a range from 0.25 to 3 kVA every 5...10 sec's ? A. König |
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