Operating Instructions

Descriptions of Parameter Settings
Descriptions of Parameter Settings
232 | 443
Pr.
Explanation
Settings
Default
10-25
FOC bandwidth for speed
observer
20.0 to 100.0 Hz
40.0
Setting the speed observer to a higher bandwidth could shorten the speed response time but creates greater noise
interference during the speed observation.
Pr.
Explanation
Settings
Default
10-26
FOC minimum stator frequency
0.0 to 10.0% fN
2.0
● Sets the stator frequency lower limit in operation status.
● This setting ensures the stability and accuracy of observer and avoids interferences from voltage, current and
motor parameters.
● fN is the motor rated frequency.
Pr.
Explanation
Settings
Default
10-27
FOC low pass filter time constant
1 to 1000 ms
50
Sets the low pass filter time constant of a flux observer at start-up. If you cannot activate the motor during high
speed operation, lower the setting for this parameter.
Pr.
Explanation
Settings
Default
10-28
FOC gain for excitation current
rise time
33 to 100% Tr
100
● Sets the drive’s excitation current rise time when it activates in open-loop torque mode.
● When the drive’s activation time is too long in torque mode, adjust this parameter to a shorter time value.
● Tr is the rotor time constant.
Pr.
Explanation
Settings
Default
10-29
Upper limit of frequency deviation
0.00 to 200.00 Hz
20.00
● Limits the maximum frequency deviation.
● If you set this parameter too high, an abnormal feedback malfunction occurs.
● If the application needs a higher setting for Pr.10-29, note that a higher setting results in larger motor slip,
which causes a PG Error (PGF3, PGF4). In this case, you can set Pr.10-10 and Pr.10-13 to 0 to disable PGF3
and PGF4 detection, but you must make sure the MI7 wiring and application are correct; otherwise, it may lose
the instant PG protection. Setting Pr.10-29 too high is not commonly done.
Pr.
Explanation
Settings
Default
10-31
I/F mode, current command
0 to 150% rated current of the motor
40
● Sets the current command for the drive in the low speed area
(low speed area: Frequency command < Pr.10-39).
● When the motor stalls on heavy-duty start-up or forward/reverse with load, increase the parameter value.
● If the inrush current is too high and causes oc stall, then decrease the parameter value.