600 YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
D.4 Safe Disable Input Function
D.4 Safe Disable Input Function
Specifications
Precautions
DANGER! 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. When
implementing the Safe Disable function into the safety system of a machine, a thorough risk assessment for the whole system has to
be carried out to assure it complies with relevant safety norms (e.g., ISO/EN 13849, IEC/EN 61508, IEC/EN 62061,...).
DANGER! When using a PM motor, even if the drive output is shut off by the Safe Disable function, a break down of two output
transistors 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 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.
DANGER! 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.
DANGER! 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.
DANGER! 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.
When utilizing the Safe Disable function; an EMC filter must be used. Use only the EMC filters recommended in EMC
Filters on page 582.
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.
A Safe Disable Status Monitor for
error detection in the safety circuit is also provided.
Safe Disable Circuit
The Safe Disable circuit consists of two independent input channels that can block the output transistors. In addition, it
provides a monitoring channel that indicates the status of those two input channels.
The input can either use the drive internal p
ower supply or an external power supply. Both modes, Sink mode and Source
mode are supported. The mode that is 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 Selection for Safe Disable Inputs
on page 88.
The Safe Disable Monitor uses a single cha
nnel photocoupler output. Refer to Output Terminals on page 84 for signal
specifications when using this
output.
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. (Note:
DC from EDM considered.)
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