Safe Disable Input Precautions; Specifications; Precautions; Safe Disable Function Description - YASKAWA T1000V Technical Manual

D.4 Safe Disable Input Precautions
D.4 Safe Disable Input Precautions

◆ Specifications

Inputs / Outputs
Operation Time
Failure Probability

◆ 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., ISO13849-1, Safety Category 3, IEC61508, SIL2, and EN62061).
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 input, make sure to remove the wire link between terminals H1 and HC that has been
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 H1 has opened, it takes up to 1 ms for drive output to shut off completely. The sequence set up to
trigger terminal H1 should make sure that terminal H1 remains open for at least 1 ms in order to properly interrupt drive output.
NOTICE: When utilizing the Safe Disable function, use only the EMC filters recommended in
page 411.

◆ Safe Disable Function Description

Safe Disable input has been designed to meet the requirements of the ISO13849-1, Category 3 PLd, and IEC61508,
SIL2.
Opening the connection between terminal HC and H1 disables the drive output, i.e. the power supply to the motor is cut
by stopping the switching of the output transistors in a safe way. "Hbb" is shown on the display. Safe Disable is
applicable for induction and permanent magnet motors.
420
One Safe Disable input according to ISO13849-1 Cat. 3 PLd, IEC61508 SIL2.
Time from input open to drive output stop is less than 1 ms.
Demand Rate Low PFD = 1.24E
Demand Rate High or
PFH = 5.17E
Continuous
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YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
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