Chapter 12 Description of Parameter Settings
MH300
Zero Voltage Time During Start-up
Default: 00.000
Settings 00.000–60.000 sec.
This parameter is valid only when the setting of Pr.07-12 (Speed Tracking during Start-up) = 0.
When the motor is in static state at start-up, this increases the accuracy when estimating angles.
In order to put the motor in static state, set the three-phase drive output to 0 V to the motor. The
Pr.10-49 setting time is the length of time for three-phase output at 0 V.
It is possible that even when you apply this parameter, the motor cannot go in to the static state
because of inertia or some external force. If the motor does not go into the static state in 0.2
seconds, increase this setting value appropriately.
If Pr.10-49 is too high, the start-up time is longer. If it is too low, then the braking performance is
weak.
Default: 500
Settings 0–1200 Hz
This parameter is a high frequency injection command in PM SVC control mode, and usually you
do not need to adjust it. But if a motor’s rated frequency (for example, 400 Hz) is too close to the
frequency setting for this parameter (that is, the Default of 500 Hz), it affects the accuracy of the
angle detection. Refer to the setting for Pr.01-01 before you adjust this parameter.
If the setting value for Pr.00-17 is lower than Pr.10-51*10, then increase the frequency of the
carrier wave.
Pr.10-51 is valid only when Pr.10-53 = 2.
Default: 15.0 / 30.0
Settings 0.0–200.0 V
The parameter is the magnitude command for the high frequency injection signal in PM SVC
control mode.
Increasing the parameter can increase the accuracy of the angle estimation, but the
electromagnetic noise might be louder if the setting value is too high.
The system uses this parameter when the motor’s parameter is “Auto”. This parameter influences
the angle estimation accuracy.
When the ratio of the salient pole (Lq/Ld) is lower, increase Pr.10-52 to make the angle detection
more accurate.
Pr.10-52 is valid only when Pr.10-53 = 2.
Default: 0
Settings 0: Disabled
1: Force attracting the rotor to zero degrees
2: High frequency injection
3: Pulse injection
Set to 2 for IPM; set to 3 for SPM. If these settings cause problems, then set the parameter to 1.
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