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34 YASKAWA TOMPC71061753A YASKAWA AC Drive GA500 Installation and Operation Instruction
Table 1.10 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
■ Safe Disable Circuit
The Safe Disable circuit has two isolated channels (terminals H1 and H2) that stop the output
transistors. The input can use the internal power supply of the drive.
Set the EDM function to one of the MFDO terminals [H2-xx = 21 or 121] to monitor the status
of the Safe Disable function. This is the “Safe Disable monitor output function”.
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