16 Safe Disable Input
YASKAWA TOEPC7106171FD FP605 DRIVE INSTALLATION & PRIMARY OPERATION 105
◆ Safe Disable Specifications
The Safe Disable input provides the stop function that complies with “Safe Torque Off” as specified by IEC/EN
61800-5-2. The Safe Disable input meets the requirements of EN ISO 13849-1 and IEC/EN 61508. It also has a safety
status monitor to detect safety circuit errors.
When you install the drive as a component in a system, you must make sure that the system complies with the
applicable safety standards.
Refer to Table 16.2 for safety function specifications.
Table 16.2 Safe Disable Specifications
Item Description
Input/Output
• Input: 2
Safe Disable input (H1, H2)
Signal ON level: 18 Vdc to 28 Vdc
Signal OFF level: -4 Vdc to +4 Vdc
• Output: 1
MFDO safety monitor output for external device monitor (EDM)
Response time from when the input opens to when the drive output stops 3 ms or less
Response time from when the H1 and H2 terminal inputs open to when the EDM
signal operates
20 ms or less
Failure probability
Less frequent operation request mode PFD = 1.84E
-5
Frequent operation request mode or
continuous mode
PFH = 1.19E
-9
Performance level The Safe Disable input complies with the performance level requirements of EN ISO 13849-1.
HFT (hardware fault tolerance) N = 1
Type of subsystem Type B
Note:
EDM = External Device Monitoring
PFD = Probability of Failure on Demand
PFH = Probability of Dangerous Failure per Hour
◆ Notes
DANGER
Sudden Movement Hazard. When you use the Safe Disable function in the safety system of a machine, do a full
risk assessment for the system to make sure that all parts of the system comply with applicable safety standards. Incorrect
application of the Safe Disable function can cause serious injury or death.
DANGER
Sudden Movement Hazard. If the output circuit of the drive is damaged and the Safe Disable function turns OFF
the drive output to a permanent magnet (PM) motor, the motor can rotate 180 electrical degrees. Prevent damage to equipment and
injury to personnel during this condition. Sudden motor movement can cause serious injury or death. It is possible for current to flow
through the motor winding in these conditions.
DANGER
Electrical Shock Hazard. You cannot depend on the Safe Disable function to prevent electrical shock. Disconnect
all power to the drive and wait for the time specified on the warning label before you remove covers. Check the drive for dangerous
voltages before servicing or repair work. If you do work on the drive when it is energized and there is no cover over the electronic
circuits, it can cause serious injury or death.
WARNING
Sudden Movement Hazard. Although the Safe Disable function is in operation, gravity or other external forces in
the vertical axis can move the motor. Incorrect application of the Safe Disable function can cause serious injury or death.
WARNING
Sudden Movement Hazard. Do not use the drive output signals to control external holding brakes or dynamic
brakes for functional safety. Use a system that conforms to the functional safety requirements. Incorrect application of the Safe
Disable function can cause serious injury or death. Systems that use drive output signals (including EDM) for safety are not safe
because drive output signals are not safety components.
WARNING
Sudden Movement Hazard. Connect the Safe Disable inputs to the devices as specified by the safety
requirements. If you connect the Safe Disable inputs incorrectly, it can cause serious injury or death.
WARNING
Sudden Movement Hazard. To use the Safe Disable inputs, remove the jumpers between terminals H1-HC and
H2-HC. If the Safe Disable circuit does not work correctly, it can cause serious injury or death.
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