Delta MS300 Series User Manual page 435

Chapter 12 Descriptions of Parameter SettingsMS300
10-25
FOC Bandwidth for Speed Observer

Settings
 Setting the speed observer to a higher bandwidth could shorten the speed response time but
creates greater noise interference during the speed observation.
10-26
FOC Minimum Stator Frequency

Settings
 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.
10-27 FOC Low Pass Filter Time Constant

Settings
 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.
10-28
FOC Gain for Excitation Current Rise Time

Settings
 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.
10-29
Upper Limit of Frequency Deviation

Settings
 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, when the MI7 terminal receives pulse
signals that results in larger motor slip, it may causes a PG Error (PGF3, PGF4) easily. 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.
10-31
I/F Mode, Current Command

Settings
 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.
20.0–100.0 Hz
0.0–10.0% fN
1–1000 ms
33–100% Tr
0.00–200.00 Hz
0–150% rated current of the motor
426
Default: 40.0
Default: 2.0
Default: 50
Default: 100
Default: 20.00
Default: 40