188
YASKAWA
TOEPC71061752B GA500 Drive Installation & Primary Operation
Table 18.2 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
30 ms or less
Failure probability
Less frequent operation
request mode
PFD = 1.38E
-5
Frequent operation request
mode or continuous mode
PFH = 3.35E
-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
MTTF
D
High
DCavg
Medium
Mission time
10 years
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.