YASKAWA ELECTRIC
SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
281
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Safe Disable Specifications
The Safe Disable input provides the stop function compliant to
“
Safe Torque Off
”
defined in IEC/EN 61800-5-
2:2007. The Safe Disable input is designed to meet the requirements of EN ISO 13849-1 and IEC/EN 61508. It is
also equipped with the 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 4.24 for safety function specifications.
Table 4.24 Specifications for the Safety Function
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 opening the input to stopping the drive
output
3 ms or less
Response time from opening H1 and H2 terminal inputs to
operating the EDM signal
20 ms or less
Failure probability
Less frequent operation request
mode
PFD = 4.65E
-6
Frequent operation request
mode or continuous mode
PFH = 1.11E
-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
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Precautions
DANGER
Sudden Movement Hazard. Make sure that the full 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, 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 will cause serious injury or death.
DANGER
Sudden Movement Hazard. An external holding brake or dynamic brake are NOT drive safety components.
Systems that use an external holding brake or dynamic brake with a drive output signal (including EDM) are not safe systems
because the drive output signal is not a safety component. You must use a system that satisfies the safety requirements. Failure
to obey will cause death or serious injury.
DANGER
Sudden Movement Hazard. Connect the Safe Disable inputs to the devices as specified by the safety
requirements. Failure to obey will cause death or serious injury.
WARNING
Sudden Movement Hazard. With PM motors, the failure of two output transistors can cause current to flow
through the motor winding and move the motor output axis 180 electrical degrees.This is possible when the Safe Disable
function turns off the drive output. Make sure that output transistors failure will not effect the safety of the application when with
the Safe Disable function. Failure to obey could cause serious injury or death.
WARNING
Electrical Shock Hazard. The Safe Disable function will turn off the drive output, but it will not stop the drive
power supply and it cannot electrically isolate the drive output from the input. Always turn off the drive power supply during
maintenance and installations on the drive input and output sides. Failure to obey could cause death or serious injury.
WARNING
Sudden Movement Hazard. An external gravitational force in the vertical axis will move the motor although the
Safe Disable function is in operation. Failure to obey could cause serious injury or death.
WARNING
Sudden Movement Hazard. Remove the pre-installed wire links between terminals H1-HC and H2-HC to use
the Safe Disable inputs. Failure to obey will prevent correct operation of the Safe Disable circuit and could cause death or
serious injury.
WARNING
Sudden Movement Hazard. Regularly examine the Safe Disable input and all other safety features. A system
that does not operate correctly can cause death or serious injury.
