Mitsubishi Electric FR-A800, Instruction Manual

Page: 359 / 1042

Parameters Position control under vector control and PM sensorless vector control
FR-A800 5 - 179
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.
5.5.8 Position adjustment parameter settings
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 is turned 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.
Parameters referred to
Pr. 422 Position control gain => page 5-181
Pr. Name
Initial
value
Setting range Description
426
B007
In-position width 100 pulses 0 to 32767 pulses
Set the number of droop pulses that triggers the
In-position (Y36) signal.
427
B008
Excessive level error 40 x 10³
0 to 400 x 10³
Set the number droop pulses that activates
Excessive position fault (E.OD).
9999 Function invalid
1294
B192 Position detection lower 4
digits
0 0 to 9999
Set the lower four digits of the position detection
value.
1295
B193 Position detection upper 4
digits
0 0 to 9999
Set the upper four digits of the position
detection value.
1295
B193 Position detection
selection
0
0
The position is detected on both the plus side
and minus sides.
1 The position is detected on the plus side only.
2 The position is detected on the minus side only.
1297
B195 Position detection
hysteresis width
0 0 to 32767
Set the hysteresis width for the detection
position of the position detected signal (FP
signal).
Vector Vector Vector PM PM PM