YASKAWA T1000A - Page 240

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5.9 n: Special Adjustments

240 YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual

n n8-02: Pole Attraction Current

Sets the current applied to pull the rotor into position after the initial rotor position estimations are complete. The value is

set as a percentage of the motor rated current. Increase this setting in order to increase the starting torque.

Note: This parameter is available only when using AOLV/PM control mode.

n n8-35: Initial Rotor Position Detection Selection

Selects how the rotor position is detected at start.

Note: 1. This parameter is available only when using AOLV/PM or CLV/PM control mode.

2. In CLV/PM, the drive performs a magnetic pole search the first time it starts the motor. After that, rotor position is calculated from the

PG encoder signal and saved until the drive is switched off. Parameter n8-35 determines how this initial pole search operates.

3. High Frequency Injection and pulse injection for rotor position detection (n8-35 = 1 or 2) can be used with IPM motors only. When

using a SPM motor, select the pull in method to find the initial position of the rotor (n8-35 = 0).

Setting 0: Pull in

Starts the rotor using pull-in current.

Setting 1: High Frequency Injection

High frequency is injected in order to detect the rotor position. Some noise may be generated from the motor at start.

Setting 2: Pulse injection

A pulse signal is injected into the motor in order to detect the rotor position.

n8-45: Speed Feedback Detection Control Gain

Sets the gain for internal speed feedback detection control. Although this setting rarely needs to be changed, adjustment

may be necessary under the following conditions:

• Increase this setting if motor oscillation or hunting occurs.

• Decrease this setting in increments of 0.05 to decrease drive responsiveness.

Note: This parameter is available only when using OLV/PM control mode.

n n8-47: Pull-In Current Compensation Time Constant

Sets the time constant for the actual current and the pull-in current to match one another.

Although this setting rarely needs to be changed, adjustment may be necessary under the following conditions:

• Increase this setting when it takes too long for the reference value of the pull-in current to match the target value.

• Decrease this setting if motor oscillation occurs.

Note: This parameter is available only when using OLV/PM control mode.

n n8-48: Pull-In Current

Sets the d-axis current during no-load operation at a constant speed. Set as a percentage of the motor rated current.

• Increase this setting when hunting occurs or the motor speed is unstable while running at a constant speed.

• If there is too much current when driving a light load at a constant speed, then slightly increasing this value.

Note: This parameter is available only when using OLV/PM control mode.