YASKAWA U1000 Series - Page 330

5.9 n: Special Adjustments
330 YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
■ n8-69: Speed Calculation Gain
There is normally no need to change this parameter from the default value.
Sets the proportional gain for Speed Estimation.
Note: This parameter is available in AOLV/PM.
■ n8-72: Speed Estimation Method Selection
There is normally no need to change this parameter from the default value.
Sets a method of the speed estimation.
Setting 0: Conventional method
Setting 1: 1000-series method
■ n8-84: Polarity Judge Current
Sets the current to determine polarity for the initial polarity calculation as a percentage of the motor rated current.
Set the value in % unit (E5-03 = 100%)
Note: 1. This parameter is available in AOLV/PM and CLV/PM.
2. If an “Si” value is listed on the nameplate for a Yaskawa motor, n8-84 should be set to “Si” value
× 2.
Judging Polarity and Motor Pole Position
If operating in Advanced OLV/PM (A1-02 = 6) or CLV/PM (A1-02 = 7), the drive determines motor polarity by
performing initial polarity estimation when it starts the motor (this is done only the first time the motor is started when
using CLV/PM). The drive may begin operating in the wrong direction if it determines motor polarity incorrectly as the
opposite direction of the Run command.
Monitor U6-57 displays the deviation from the integrated current, making it possible to see if initial polarity estimation
has successfully determined the motor polarity.
No. Name Setting Range Default
n8-69 Speed Calculation Gain 0.00 to 20.00 1.00
No. Name Setting Range Default
n8-72 Speed Estimation Method Selection 0, 1 1
No. Name Setting Range Default
n8-84 Polarity Judge Current 0 to 150% 100%
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