7-9-18
LAD Cancel Function
“LAD” is the function for calculating the acceleration/deceleration time. The LAD cancel function forci-
bly sets the acceleration/deceleration time to 0.
When the LAC terminal is turned ON, the frequency acceleration/deceleration function (LAD) is disa-
bled and the frequency reference is output momentarily
.
This function is also applicable to the acceleration/deceleration during the jogging operation and the
deceleration during forced stop.
Parameter No. Function name Data Default data Unit
E01 to E05, E98,
E99
Input Terminal [DI1] to [DI7]
Function Selection
84: LAC (LAD Cancel) - -
Related function F07, F08, E10 to E15
Set frequency
Output frequency
FW input
Normal acceleration/ deceleration
1st Deceleration
Time 1
F08
1st Acceleration
Time 1
F07
1st Maximum
Output
Frequency
F03
1st Deceleration
Time 1
F08
1st Acceleration
Time 1
F07
Set frequency
Output frequency
FW input
LAC input
LAD cancel
1st Maximum
Output
Frequency
F03
7-9-19
Servo Lock Function
The servo lock function is used to control the position of the motor, and continue to retain the position
even when an external force is applied.
It is enabled only during vector control with speed sensor. The servo lock function is enabled by turn-
ing the LOCK terminal ON.
If operation is stopped even with position control disabled (SPD terminal ON) when the servo lock is
enabled, a deceleration is performed to the stop frequency, then position control is performed with the
position where the output frequency becomes 0 taken as the target stop position, and then servo lock
is performed.
The servo lock operates at a low speed, and therefore, if it is used by applying an external force over a
long period of time, overheat protection may be activated.
Servo lock is started when all of the following conditions are satisfied.
•
RUN command is OFF, or set frequency < stop frequency (F25)
• LOCK terminal ON
• [“0: Output frequency, Detected speed” is set for 1st Stop Frequency Detection Method Selection
(F38) and speed detection value is Stop Frequency (F25) or less] or [“1: Frequency reference” is
selected for 1st Stop Frequency Detection Method Selection (F38) and frequency reference value is
Stop Frequency (F25) or less]
7 Other Functions
7-148
M1 Series Standard Type User's Manual (I669)
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