518 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical ManualD.4 Safe Disable Input FunctionD.4 Safe Disable Input Function◆ Specifications◆ PrecautionsDANGER! Improper use of the Safe Disable function can result in serious injury or even death.Make sure the whole system or machinery that the Safe Disable function is used in complies with safety requirements. Whenimplementing the Safe Disable function into the safety system of a machine, a thorough risk assessment for the whole system has tobe carried out to assure it complies with relevant safety norms (e.g., EN954/ISO13849, IEC61508, EN/IEC62061,...).DANGER! When using a PM motor, even if the drive output is shut off by the Safe Disable function, a break down of two outputtransistors can cause current to flow through the motor winding, resulting in a rotor movement for a maximum angle of 180 degree(electrically). Make sure such a situation would have no effect on the safety of the application when using the Safe Disable function.This is not a concern with induction motors.DANGER! The Safe Disable function can switch off the drive output, but does not cut the drive power supply and cannot electricallyisolate the drive output from the input. Always shut off the drive power supply when performing maintenance or installations on thedrive input side as well as the drive output side.DANGER! When using the Safe Disable inputs, make sure to remove the wire links between terminals H1, H2, and HC that wereinstalled prior to shipment. Failing to do so will keep the Safe Disable circuit from operating properly and can cause injury or evendeath.DANGER! All safety features (including Safe Disable) should be inspected daily and periodically. If the system is not operatingnormally, there is a risk of serious personal injury.DANGER! Only a qualified technician with a thorough understanding of the drive, the instruction manual, and safety standards shouldbe permitted to wire, inspect, and maintain the Safe Disable input.NOTICE: From the moment terminal inputs H1 and H2 have opened, it takes up to 1 ms for drive output to shut off completely. Thesequence set up to trigger terminals H1 and H2 should make sure that both terminals remain open for at least 1 ms in order to properlyinterrupt drive output.NOTICE: The Safe Disable Monitor (output terminals DM+ and DM-) should not be used for any other purpose than to monitor theSafe Disable status or to discover a malfunction in the Safe Disable inputs. The monitor output is not considered a safe output.When utilizing the Safe Disable function, use only the EMC filters recommended in .EMC Filters on page 513◆ Using the Safe Disable FunctionThe Safe Disable inputs provide a stop function in compliance with Stop Category 0 as defined in the EN60204-1(uncontrolled stop by power removal), and “Safe Torque Off” as defined in the IEC61800-5-2. Safe Disable inputs havebeen designed to meet the requirements of the EN954-1/ISO13849-1, Category 3 and EN61508, SIL2.A Safe Disable Status Monitor for error detection in the safety circuit is also provided.■ Safe Disable CircuitThe Safe Disable circuit consists of two independent input channels that can block the output transistors. In addition, itprovides a monitoring channel that indicates the status of those two input channels.The input can either use the drive internal power supply or an external power supply. Both modes, Sink mode and Sourcemode are supported. The mode that is selected for the digital input terminals S1 to S8 by switch S3 will also be used forthe Safe Disable inputs. Refer to Sinking/Sourcing Mode Selection for Safe Disable Inputs on page 77.The Safe Disable Monitor uses a single channel photocoupler output. Refer to Output Terminals on page 73 for signalspecifications when using this output.Inputs / Outputs Two Safe Disable inputs and 1 EDM output according to EN61800-5-1, EN954-1/ISO13849 Cat. 3, IEC/EN61508SIL2, Insulation coordination: class 1.Operation Time Time from input open to drive output stop is less than 1 ms.Failure ProbabilityDemand Rate Low PFD = 5.15E-5Demand Rate High/Continuous PFH = 1.2E -9Performance Level The Safe Disable Inputs satisfy all requirements of Performance Level (PL) d according to ISO13849-1. (Note: DCfrom EDM considered.)
