Sdi Function - Mitsubishi Electric MELSERVO-J5 Series User Manual

SDI function

Outline
This function monitors whether the servo motor travels in the specified direction. If the servo motor travels in a direction
different from the specified direction, the STO function will be activated.
Operation sequence
The SDI function is activated by turning off SDIPC (SDIP command) or SDINC (SDIN command). When SDIPC (SDIP
command) is turned off, the function monitors the address increasing direction. When SDINC (SDIN command) is turned off,
the function monitors the address decreasing direction. The function starts monitoring when either the time set in [Pr. PSA27
SDI positive direction monitor delay time] or [Pr. PSA28 SDI negative direction monitor delay time] has elapsed after SDIPC
(SDIP command) or SDINC (SDIN command) is turned off. During monitoring, the function monitors whether the speed is
within [Pr. PSA04 Safety sub-function - Stop speed] for the specified monitoring direction. Monitoring ends by turning on
SDIPC (SDIP command) or SDINC (SDIN command).
The SDI direction monitor delay time can be specified individually for the address increasing direction and for the address
decreasing direction.
SDI command
SDIP command
SDIN command
The operation sequence by SDIPC (SDIP command) is shown below. The function monitors the address increasing direction.
Servo motor speed
SDIPC (SDIP command)
SDIPS (SDIP output)
SDINC (SDIN command)
SDINS (SDIN output)
6 FUNCTIONAL SAFETY
376
6.4 Safety sub-function
Monitoring direction
Address increasing direction
Address decreasing direction
Stop speed
0 r/min
(mm/s)
Stop speed
ON (disabled)
OFF (enabled)
ON (disabled)
OFF (enabled)
ON (disabled)
OFF (enabled)
ON (disabled)
OFF (enabled)
SDI positive direction
monitor delay time Direction monitoring
Feedback
Command
Applied SDI direction monitor delay time
[Pr. PSA27 SDI positive direction monitor delay
time]
[Pr. PSA28 SDI negative direction monitor delay
time]
An alarm will occur if the stop
speed in the address increasing
direction is exceeded.