Position Adjustment Parameter Settings - Mitsubishi Electric 800 Series Instruction Manual

Position control under vector control
Position command constant value during acceleration/deceleration
(Pr.424)
• If the electronic gear ratio is large (1:10 or larger) and the rotation speed is slow, the rotation is not smooth and the rotation
shape becomes like a pulse. Set this option in such a case to smoothen the rotation.
• If the command pulse frequency varies rapidly when no acceleration time can be assigned to the command pulse,
overshoot or excessive error alarms may occur. Set this option in such a case to set the acceleration/deceleration time.
Normally it is set to 0.
Parameters referred to ???????
Pr.422 Position control gain
5.5.9

Position adjustment parameter settings

Pr. Name
426
In-position width
B007
427
Excessive level error
B008
1294 Position detection lower
B192 4 digits
1295 Position detection upper
B193 4 digits
1296 Position detection
B194 selection
1297 Position detection
B195 hysteresis width
In-position width (Pr.426, Y36 signal)
• The Y36 signal is used as the in-position signal.
• If the number of droop pulses is equal to or smaller than the Pr.426 setting value, the In-position (Y36) signal turns ON.
• To use the Y36 signal, set "36 (positive logic) or 136 (negative logic)" in any of Pr.190 to Pr.196 (Output terminal function
selection) to assign the function.
Excessive error level (Pr.427)
• If the number of droop pulses exceeds the Pr.427 setting, a position error is detected, Excessive position fault (E.OD) is
activated and the inverter output is shut off. Increase the error threshold level when a small value is set as the Position
control gain setting value. Set a small value for early detection even when the load is heavy.
• If Pr.427="9999" is set, E.OD is not activated regardless of the amount of droop pulses.
234
PARAMETERS
page 236
Initial
Setting range
value
100 pulses 0 to 32767 pulses
0 to 400K
40K
9999
0 0 to 9999
0 0 to 9999
0
0 1
2
0 0 to 32767
Description
Set the number of droop pulses that triggers the In-position
(Y36) signal.
Set the number droop pulses that activates Excessive
position fault (E.OD).
Function invalid
Set the lower four digits of the position detection value.
Set the upper four digits of the position detection value.
The position is detected on both the plus and minus sides.
The position is detected on the plus side only.
The position is detected on the minus side only.
Set the hysteresis width for the detection position of the
position detected signal (FP signal).
Vector Vector Vector