D.6 Safe Disable Input Precautions
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Safe Disable Function Description
The Safe Disable function can be utilized to perform a safe stop according to the IEC/EN 61800-5-2, stop category 0
(Uncontrolled stop by power removal). It is designed to meet the requirements of the ISO/EN 13849-1, Safety Category
3, PL d, and IEC/EN 61508, SIL2.
Removing the voltage from terminal 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.
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Installation
If the Safe Disable function is utilized, the wire link between the terminals HC and H1 that is installed at shipment must
be removed entirely.
Connect the drive to an ISO/EN 13849-1, Safety Category 3 interrupting device so that in case of a Safe Disable request
the connection between the terminals HC and H1 is opened.
Power Supply
Controller
HC
H1
ISO/EN 13849-1 Safety
Cat, 3 Device
M
Drive
Figure D.12 Safe Disable Wiring Example
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Installation Precautions
•
To ensure the Safe Disable function appropriately fulfills the safety requirements of the application, a thorough risk
assessment for the safety system must be carried out.
• The drive must be installed in
an enclosure with a protection degree of at least IP54 in order to maintain ISO/EN 13849-1,
safety category 3 compliance.
• If the safety device and the drive are installed in separate cabinets, install the Safe Disable wires in a manner preventing
short circuits.
• The Safe Disable function does not cut the power supply to the drive and does not provide electrical isolation. Before
any installation or maintenance work is done, the power supply of the drive must be switched off.
• Consider the following when using PM motors: When the Safe Disable function is active, a failure in two of the drive
power devices can occur and current will continue to flow through the motor winding. This failure will not produce
torque in an induction motor, however, when occurring in a PM motor, torque will be produced and cause an alignment
of the rotor magnets, which may cause the rotor to turn up to 180 degrees electrically. Ensure that this possible failure
mode is not safety-critical for the application.
• The wiring distance for the Safe Disable inputs should not exceed 30 m.
• The time from opening the Safe Disable input until the drive output is switched off is less than 1 ms.
D.6 Safe Disable Input Precautions
452
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
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