C.3 Safe Disable Input Function
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Specifications
Inputs/Outputs
Two Safe Disable inputs and one EDM output according to ISO/EN 13849-1 Cat. 3 PLd, IEC/EN
61508 SIL2.
Operation Time Time from input open to drive output stop is less than 1 ms.
Failure Probability
Demand Rate Low
PFD = 5.15E
-5
Demand Rate High/
Continuous
PFH = 1.2E
-9
Performance Level
The Safe Disable inputs satisfy all requirements of Performance Level (PL) d according to ISO/EN
13849-1 (DC from EDM considered).
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Precautions
DANGER! Sudden Movement Hazard. Improper use of the Safe Disable function can result in serious injury or even death. Make sure the
whole system or machinery in which the Safe Disable function is used complies with safety requirements. When implementing the Safe
Disable function into the safety system of a machine, perform a thorough risk assessment for the entire system to assure compliance with
relevant safety norms.
DANGER! Sudden Movement Hazard. When using a PM motor, even if the drive output is shut off by the Safe Disable function, a breakdown
of two output transistors can cause current to flow through the motor winding, resulting in a rotor movement for a maximum angle of 180
degrees (electrically). Make sure such a situation would have no effect on the safety of the application when using the Safe Disable function.
DANGER! Sudden Movement Hazard. The Safe Disable function can switch off the drive output, but does not cut the drive power supply
and cannot electrically isolate the drive output from the input. Always shut off the drive power supply when performing maintenance or
installations on the drive input side as well as the drive output side.
WARNING! Sudden Movement Hazard. When using the Safe Disable inputs, make sure to remove the wire links between terminals H1,
H2, and HC that were installed prior to shipment. Failing to do so will keep the Safe Disable circuit from operating properly and can cause
injury or even death.
NOTICE: All safety features (including Safe Disable) should be inspected daily and periodically. If the system is not operating normally,
there is a risk of serious personal injury.
NOTICE: Only a qualified technician with a thorough understanding of the drive, the instruction manual, and safety standards should be
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. The sequence
set up to trigger terminals H1 and H2 should make sure that both terminals remain open for at least 1 ms in order to properly interrupt drive
output.
NOTICE: The Safe Disable Monitor (output terminals DM+ and DM-) should not be used for any other purpose than to monitor the Safe
Disable status or to discover a malfunction in the Safe Disable inputs. The monitor output is not considered a safe output.
NOTICE: When utilizing the Safe Disable function, an EMC filter must be used. Use only the EMC filters recommended in the drive Technical
Manual.
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Using the Safe Disable Function
The Safe Disable inputs provide a stop function in compliance with “Safe Torque Off” as defined in the IEC/EN 61800-5-2.
Safe Disable inputs have been designed to meet the requirements of the ISO/EN 13849-1, Category 3 PLd, and IEC/EN 61508,
SIL2. The PDS intended use shall be in the first environment (EM).
A Safe Disable Status Monitor for error detection in the safety circuit is also provided.
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Safe Disable Circuit
The Safe Disable circuit consists of two independent input channels that can block the output transistors and provide a
monitoring channel to indicate the status of those input channels.
The input can use the internal power supply of the drive or an external power supply and it will support Sink mode or Source
mode. the mode selected for the digital input terminals S1 to S8 by switch S3 will also be used for the Safe Disable inputs.
Refer to Sinking/Sourcing Mode for Digital Inputs on page 110 for more information.
The Safe Disable Monitor uses a single channel photocoupler output. Refer to Output Terminals on page 106 for signal
specifications when using this output.
C.3 Safe Disable Input Function
352
YASKAWA ELECTRIC TOEP C710616 41G YASKAWA AC Drive - A1000 Quick Start Guide
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