Order Of Priority Of Safety Functions - YASKAWA E-V Series User Manual

6.7

Order of Priority of Safety Functions

Safety functions can be set individually for Safety Function A and Safety Function B. Two safety functions
may be executed under the following two conditions:
• If one of the two safety functions is changed to the safe (HWBB) state, the other function will also be
changed to the safe (HWBB) state.
• Both safety functions operate independently.
Examples of these two conditions are given below.
(1) When Both Safety Functions are Changed to the Safe (HWBB) State
During the execution of two safety functions, if one safety function is changed to the safe (HWBB) state, the
other will also be forcibly changed to the safe (HWBB) state.
Example: When the SBB function is set as Safety Function A and the SPM-D function is set as Safety Function B
<SBB function>
Safety request input state A
Safety function A operation state
<SPM-D function>
Safety request input state B
Safety function B operation state
The returning method is the same as that for the SBB function. For details, refer to 6.3.3 Returning Method.
(2) When Two Safety Functions Operate Independently
Safety Function A and Safety Function B independently monitor the motor speed.
Example: When the SLS-D Function is set as Safety Function A and Safety Function B
<SLS-D function>
Safety request input state A
<SLS-D function>
Safety request input state B
Monitoring speed
Operation Timing
ON
Stand by
ON
Deceleration
Stand by
monitoring
Operation Timing
ON OFF
ON OFF
0

6.7 Order of Priority of Safety Functions

OFF ON
Safe (HWBB) state Stand by
OFF ON
Safe (HWBB) state Stand by
Changed to safe (HWBB) state.
ON
ON
t
: Monitoring speed A
: Monitoring speed B
: Actual monitoring speed
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