YASKAWA U1000 Series

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5.2 b: Application

214 YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual

Note: This default value changes if the motor rated capacity set to E2-11 is changed. The Energy Saving coefficient is set automatically

when Auto-Tuning for Energy Saving is performed (Refer to Auto-Tuning on page 154).

■ b8-05: Power Detection Filter Time (V/f, V/f w/PG)

The Energy Saving function continuously searches out the lowest output voltage in order to achieve minimum output

power. Parameter b8-05 determines how often the output power is measured in ms.

Reducing this setting will increase the response time. If the filter time is too short, the motor may become unstable with a

lighter load.

■

b8-06: Search Operation Voltage Limit (V/f, V/f w/PG)

Sets the voltage limit for the optimal output voltage detection of Speed Search as a percentage of the maximum output

voltage. During the search operation, the drive will keep the output voltage above this level to prevent motor stalling.

Note: If set too low, the motor may stall with a sudden increase to the load. Disabled when b8-06 = 0. Setting this value to 0 does not

disable Energy Saving.

■ b8-16: Energy Saving Parameter (Ki) for PM Motors

Coefficient to adjust torque linearity.

There is normally no need to change this parameter from the default value.

When E5-01 (Motor Code Selection (for PM Motors)) is set to 1 or 2, the automatically calculated value

will be set. This set value cannot be changed. If oscillation occurs when Energy Saving is enabled (b8-01 = 1), then check

the value displayed in monitor U5-21. If the value displayed differs from the Ki value written on the motor nameplate,

then set b8-16 accordingly.

■

b8-17: Energy Saving Parameter (Kt) for PM Motors

Coefficient to adjust torque linearity.

There is normally no need to change this parameter from the default value.

When E5-01 (Motor Code Selection (for PM Motors)) is set to 1 or 2, the automatically calculated value

will be set. This set value cannot be changed. If oscillation occurs when Energy Saving is enabled (b8-01 = 1), then check

the value displayed in monitor U5-22. If the value displayed differs from the Kt value written on the motor nameplate,

then set b8-17 accordingly.

■

b8-27: q-Axis Current Compensation Method when Output Voltage is Limited

There is normally no need to change this parameter from the default value. Sets a compensation method for the q-axis

current when output voltage is limited.

Setting 0: Output Voltage Limit Priority

Setting 1: q-Axis Current Priority