u
b8: Energy Saving
The Energy Saving feature improves overall system operating
efficiency by operating the motor at its most efficient level.
This is accomplished by continuously monitoring the motor load and controlling the motor so that it always operates near
its rated slip frequency.
Note: Energy Saving is mainly designed for applications with variable torque (Normal Duty) but is not appropriate for applications where
the load may suddenly increase.
n
b8-01: Energy Saving Control Selection
Enables or disables the Energy Saving function.
No. Parameter Name Setting Range Default
b8-01 Energy Saving Control Selection 0 or 1 0
Setting 0: Disabled
Setting 1: Enabled
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b8-02: Energy Saving Gain (OLV only)
Sets the gain that is used to for magnetizing current reduction during Energy Saving. A higher value results in lower
magnetization of the motor and thereby less energy consumption. However, if b8-02 is too high the motor might stall.
No. Name Setting Range Default
b8-02 Energy Saving Gain 0.00 to 10.0 0.7
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b8-03: Energy Saving Control Filter Time Constant (OLV only)
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.
No. Name Setting Range Default
b8-03 Energy Saving Control Filter Time Constant 0.00 to 10.00
Determined by
o2-04
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b8-04: Energy Saving Coefficient Value (V/f Control)
Fine tunes Energy Saving control.
The
default setting is for a standard Yaskawa
motor. When using a different motor, adjust this parameter in 5% increments
while running the drive with a light load until output power monitor U1-08 is at the minimum value.
A low setting results in less output voltage and less energy consumption. If the value is set too low the motor may stall.
The default setting depends on the capacity of the drive.
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
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 100).
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b8-05: Power Detection Filter Time (V/f Control only)
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 and the output voltage is adjusted.
No. Name Setting Range Default
b8-05 Power Detection Filter Time 0 to 2000 ms 20 ms
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b8-06: Search Operation Voltage Limit (V/f Control only)
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.
No. Name Setting Range Default
b8-06 Search Operation Voltage Limit 0 to 100% 0%
5.2 b: Application
140
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
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