Delta MH300 Series

Chapter 12 Description of Parameter Settings
MH300
12.1-10-7

10-25
FOC Bandwidth for Speed Observer
Default: 40.0
Settings 20.0–100.0 Hz.
 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
Default: 2.0
Settings
FOC Minimum Stator Frequency
 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 parameter. fN is
the motor rated frequency.

10-27
FOC Low-pass Filter Time Constant
Default: 50
Settings 1–1000 ms
 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
Default: 100
Settings 33–100% Tr
 Sets the drive’s excitation current rise time when it activates in sensorless 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
Top Limit of Frequency Deviation
Default: 20.00
Settings 0.00–100.00 Hz
 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. Pr.10-29 setting too high
is not commonly done.
10-30
Resolver Pole Pair
Default: 1
Settings 1–50
 To use the Pr.10-30 function, you must set Pr.10-00 = 3 (Resolver Encoder) first.