5.2 b: Application
138 YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
n b8-03: Energy Saving Control Filter Time Constant (OLV, CLV)
Parameter b8-03 sets the response time for Energy Saving. Although lowering this value allows for a quicker response,
instability may result if it is too low.
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b8-04: Energy Saving Coefficient Value (V/f, V/f w/PG)
Parameter b8-04 is used to fine-tune Energy Saving control. The default setting depends on the capacity of the drive.
Adjust this setting while viewing the output power monitor (U1-08) and running the drive with a light load.
A low setting results in less output voltage and less energy consumption, but too small a value will cause the motor to
stall.
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 87).
n 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.
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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 motor rated 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.
n b8-16: Energy Saving Parameter (Ki) for PM Motors
Coefficient to adjust torque linearity.
Set to the Ki value specified on the motor nameplate.
When E5-01 (Motor Code Selection) is set to 1 or 2, the automatically calculated value will be set. When
the value is set automatically, it cannot be changed.
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b8-17: Energy Saving Parameter (Kt) for PM Motors
Coefficient to adjust torque linearity.
Set to the Kt value on the motor nameplate.
When E5-01 (Motor Code Selection) is set to 1 or 2, the automatically calculated value will be set. When
the value is set automatically, it cannot be changed.
No. Name Setting Range Default
b8-03 Energy Saving Control Filter Time Constant 0.00 to 10.00 s
Determined by
A1-02 and o2-04
No. Name Setting Range Default
b8-04 Energy Saving Coefficient Value 0.00 to 655.00
Determined by
C6-01, E2-11, and o2-04
No. Name Setting Range Default
b8-05 Power Detection Filter Time 0 to 2000 ms 20 ms
No. Name Setting Range Default
b8-06 Search Operation Voltage Limit 0 to 100% 0%
No. Name Setting Range Default
b8-16 Energy Saving Parameter (Ki) for PM Motors 0.00 to 2.00 1.00
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