User`s manual

9 - 6
9
Cautions when closed loop control 2 is used
[3] Mode 2
(1) Stepping motor system
Wire the encoder.
Set the count direction for encoder input at parameter 2 - 0001.
When an electronic gear is used, set the ratio between the output pulse and encoder input pulse at
parameter 2 - 0030 to 0047. Electronic gear 1 (0030 to 0037) is the ratio setting for the instruction
system, and electronic gear 2 (0040 to 0047) is the ratio setting for the feedback system. (⇒ See
electronic-gear related setting restrictions.)
In this mode, the electronic gear must be set.
Set parameter 2 - 0000 to "02" (BCD).
Enter the number of allowable deviation pulses (number of output pulses - number of feedback
pulses) to be monitored during operation to the closed loop control allowable range of parameter
2 - 0004 to 0007.
Enter the number of allowable deviation pulses (number of output pulses - number of feedback
pulses) to be monitored at completion of operation to the completion pulse allowable range of
parameter 2 - 0010 to 0013.
(2) Servo motor system
Wire the encoder.
Set the count direction for encoder input at parameter 2 - 0001.
When an electronic gear is used, set the ratio between the output pulse and encoder input pulse at
parameter 2 - 0030 to 0047. Electronic gear 1 (0030 to 0037) is the ratio setting for the instruction
system, and electronic gear 2 (0040 to 0047) is the ratio setting for the feedback system. (=> See
electronic-gear related setting restrictions.)
In this mode, the electronic gear must be set.
Set parameter 2 - 0000 to "02" (BCD).
Enter the number of allowable deviation pulses (number of output pulses - number of feedback
pulses) to be monitored at completion of operation to the completion pulse allowable range of
parameter 2 - 0010 to 0013.
(Note) As the deviation during operation is monitored on the driver side, set the number of
allowable deviation pulses (parameter 2 - 0004 to 0007) to "0".
• In closed loop control 2, when the resolution per pulse is the relationship in , the present
position is not correctly adjusted (at deviation clear, for example) from the feedback. As
compensation during operation cannot be performed accurately, be sure to use at the
conditions in when using closed loop control mode 2.
Resolution of instruction pulse > resolution of feedback pulse (value obtained by
multiplying by a factor of 4)
Resolution of instruction pulse resolution of feedback pulse (value obtained by
multiplying by a factor of 4)
[Example]
When the instruction pulse is 2000 pulses per rotation, and the feedback pulse is 500
(value obtained by multiplying by a factor of 4), a shift of up to three pulses occurs.
Reciprocal motion is repeated before and after the target position when compensation is
performed as a result of this shift.