External Auxiliary Pulse Input Observation; Continuous Standstill During Speed Monitoring; Speed Error Detection Check - Mitsubishi Electric MELSEC Q Series Programming Manual

2 SAFETY OBSERVATION FUNCTION

2.4.10 External auxiliary pulse input observation

Safety observation error
(SM57)
Shut-off signal
(Y A)

2.4.11 Continuous standstill during speed monitoring

2.4.12 Speed error detection check

Both Motion CPU and PLC CPU monitor if the difference between the feedback
position and cumulative position of external auxiliary input pulses, or safety encoder
exceeds the allowance value of position deviation or not during speed monitoring.
If the difference between the feedback position and cumulative position of external
auxiliary input pulses, or safety encoder continues to exceed the allowance value over
"speed monitoring error detection time", "Safety observation error (error code: 114)"
occurs and the shut-off signal is turned OFF.
Set the speed monitoring error detection time by parameter.
The position deviation allowance value is 1.75 pulses of external auxiliary pulse input,
or 1 pulse of safety encoder.
P
Allowance value of
position deviation
(Equivalent of 1.75 pulse
in the external auxiliary
input pulse)
Feedback position
External auxiliary input pulse accumulation
0
Switch the speed monitoring to the standstill monitoring (Refer to Section 2.7.) when
the command speed or motor speed continues the state of during stop (speed 0).
Before starting the speed monitoring, set the safety speed for test (50% of command
speed. -1 when command speed is 0) internally lower than the command speed when
the speed monitoring request is ON, and confirm to detect the following status.
"Command speed > Safety speed for test"
"Feedback speed > Safety motor speed for test"
If the over speed status is not detected within 200ms after the speed monitoring
request flag is turned ON, "Safety observation error (error code: 115)" occurs and the
shut-off signal is turned OFF.
Speed monitoring error detection time
(Parameter)
2 - 16
Error occurs
t