9 Positioning Control
9.4 2-speed Positioning Operation
98
FX3U-1PG User's Manual
- When the time required to decelerate from operation speed I < the travel time to target address II < time
required to change the speed to operation speed II + time required to decelerate from the operation
speed II
The deceleration starts before reaching operation speed II
- When the 2-speed travel amount is 0
When the 2-speed travel amount is 0, the operation starts with operation speed I and decelerates and
stops at the target address I. The 1-speed completion flag does not turn on, and the positioning
completion flag turns on when the positioning completes.
• Caution when the target address change function and the operation speed change function are used.
When a value is set to the target address change value (BFM#54, #53) or operation speed change value
(BFM#56, #55) within the time shown below just before the speed changes from the 1-speed to the 2-speed,
t
he travel amount at the 2-speed may change.
- During operation at 1 kHz or higher: within 3 ms
- During operation at less than 1 kHz: within 3 pulses
6. Speed switching
Speed switching is classified into “standard switching” and “front-load switching”.
In the FX
3U-1PG, the speed is switched by standard switching. (Refer to the figure below.)
Target address II
Operation speed I
Travel time
Speed
Time
Operation speed II
Time required for the gear to reach operation speed II
+ Time required for deceleration from operation speed II
Speed
Time
Switches the speed to the operating
speed II when the target address I
is reached.
Target address I
Speed
Time
Starts positioning at the operating
speed II when the target address I
is reached.
Target address I
<Operation by front-load switching><Operation by standard switching>
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