5-162
5-12 Simple Position Control Function
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-A@@@@)
5
Functions
Determining the Command Rotation Direction and Detected Rotation Direction
* If the command rotation direction changes before the completion of positioning, the current detected
rotation direction will be maintained until deceleration of the Inverter output frequency has been
completed and then the command rotation direction will be used. However, even if the Inverter output
frequency follows the command rotation direction the actual number of motor rotations may not keep up,
and the present position will be counted in the opposite direction until it catches up, causing deviation.
If this occurs, operation can be improved by increasing the acceleration/deceleration time.
*3. When a rotary coordinate system such as a turntable is used, setting b075 = 01 allows for positioning
in the rotation direction corresponding to the shorter moving distance. In this case, set the position per
rotation in the rotary coordinate system, in Multi-step Position Command 0 (P060). (This must be a
positive value.) The set value of P060 is used to determine the correct rotation direction. For position
commands for which movement will actually be stopped, set a multi-step position other than P060 (for
example, P061 = 6000). Take note that this function can be used only when Feedback Pulse Train
Input (P004) is "00" or "01."
P004
RV
terminal
FW
terminal
EB
terminal
Phase
difference
Command
rotation
direction
Detected rotation
direction
00
Single-phase
pulse
OFF OFF - - None None
OFF ON -
Positive/
negative
Forward/
reverse
Forward/reverse *
ON OFF -
Positive/
negative
Forward/
reverse
Forward/reverse *
ON ON - - None None
01
90° phase
difference, dual-
phase pulse 1
OFF OFF - - None None
Either ON
Less
than 1.8
kHz
Positive/
negative
Forward/
reverse
Detected from encoder
(90° phase difference)
1.8 kHz
or higher
Positive/
negative
Reverse/
reverse
Detected direction
maintained when EB
terminal is less than 1.8
kHz.
ON ON - - None None
02
90° phase
difference, dual-
phase pulse 2
OFF OFF - - None None
Either ON
Less
than 1.8
kHz
Positive/
negative
Forward/
reverse
Detected from encoder
(90° phase difference)
OFF ON
1.8 kHz
or higher
Positive/
negative
Forward/
reverse
Forward/reverse *
ON OFF
1.8 kHz
or higher
Positive/
negative
Forward/
reverse
Forward/reverse *
ON ON - - None None
03
Single-phase
pulse + direction
OFF OFF - None None
Either ON
OFF
Positive/
negative
Forward/
reverse
Forward (according to
EB terminal)
ON
Positive/
negative
Reverse/
reverse
Reverse (according to
EB terminal)
ON ON - None None
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