Mitsubishi Electric MELSEC-Q Series - Page 489

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7 AUXILIARY AND APPLIED FUNCTIONS
(e) If a negative speed change request is executed acceleration/deceleration
time change function is only valid for axes executing speed control (
), or
speed control (
).
If a negative speed change request is executed for axes executing other
instructions, acceleration/deceleration time change function becomes invalid.
Also, if an acceleration/deceleration time change is performed for axes
operating at a negative speed, acceleration/deceleration time change
function becomes invalid.
Acceleration/deceleration time change is not
executed at negative speed change request.
(Except speed control( ) and speed control( ).)
0
t
V
-100000 -200000
1000 2000
200000
1000 2000
OFF
ON
OFF
ON
A
cceleration/deceleration
time change enable device
New acceleration time
v
alue device
New deceleration time
v
alue device
Speed change request
(CHGV)
Change speed
100000
[pulse/s]
200000
-200000
-100000
Acceleration/deceleration time
change is not executed for during
operation at negative speed.
Acceleration/deceleration
time change is executed
(f) After changing deceleration time, operations for a stop or rapid stop are
shown below:
• Stop .................. Deceleration stop by the deceleration speed after change.
• Rapid stop ........ Rapid stop by parameter setting values at start.
If changing deceleration time by the acceleration/deceleration time change
function, regardless of whether the rapid stop deceleration time setting error
invalid flag (SM805) is ON or OFF, deceleration time can be changed.
Therefore, if the setting values of the rapid stop deceleration time are larger
than the deceleration time change value after change, an overrun may occur.
Refer to Section 4.3.1 for details of operation.
(g) When the current value is to execute a deceleration stop from current
command speed, if the current value exceeds the stroke limit range, a minor
error (error code: 207) occurs, and deceleration stop is made before a stroke
limit. However, if the deceleration distance after the deceleration time
change is longer than the distance until the stroke limit, deceleration stop
exceeds the stroke limit. Execute a speed change at a position where
enough movement amount until the stroke limit is ensured.