
4. SAFETY OBSERVATION FUNCTION
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4.4.4 Servo motor with functional safety
Using a servo motor with functional safety enables you to use speed monitoring functions and position
monitoring functions without external encoders for duplication of encoders.
When using a servo motor with functional safety, set [Pr. PSA02 Functional safety unit setting] to "_ _ 1 _".
When not using it, set [Pr. PSA02] to "_ _ 0 _". Refer to section 4.1 for details.
4.4.5 Position feedback fixing diagnosis function
(1) Summary
The position feedback fixing diagnosis function generates [AL. 79.8 Position feedback fixing error] to
make the servo amplifier STO state when position data from the encoder is fixed.
(2) Operation summary
The position feedback fixing diagnosis function will be enabled when the safety observation function is
enabled and moreover the servo amplifier is not in STO state. When a position feedback does not
change for the time set with [Pr. PSA22 Position feedback fixing error detection time], [AL. 79.8 Position
feedback fixing error] occurs and the STO function operates.
ON (no alarm)
OFF (alarm)
ON (disabled)
OFF (enabled)
[Pr. PSA22]
Position change: 0 pulse
STOS (STO output)
ALM (Malfunction)
Stop
STO status
Rotation
Position (P)
Servo motor
position
Summary of Contents for MR-D30
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