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1.2 b: Application
Goal
Suppress long cycle oscillations
(longer than the integral time setting)
Suppress short cycle oscillations
u
b8: Energy Saving
The Energy Saving feature improves overall system operating efficiency by operating the motor at its most efficient level.
Note:
1. Energy Saving is not designed for applications that experience instantaneous heavy loads or applications that rarely operate with light
load conditions.
2. Energy Saving is mainly designed for applications with variable torque, however Energy Saving is not appropriate for applications where
the load may suddenly increase.
3. The performance of the Energy Saving function depends on the accuracy of the motor data. Always perform Auto-Tuning and correctly
enter the motor data before using this function.
n
b8-01: Energy Saving Control Selection
Enables or disables the Energy Saving function.
Note:
Enabling the Energy Saving function when using a PM motor may adversely affect motor efficiency depending on the type of PM motor.
Disable the Energy Saving function in such cases.
No.
b8-01
Setting 0: Disabled
Setting 1: Enabled
n
b8-04: Energy Saving Coefficient Value (V/f)
Fine tunes Energy Saving control. 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. If the value is set too low the motor may stall. The
default setting depends on the capacity of the drive.
No.
b8-04
Note:
The 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.
n
b8-05: Power Detection Filter Time (V/f)
Determines how often in milliseconds the output power is measured. The Energy Saving function continuously searches out
the lowest output voltage to achieve minimum output power.
Reducing this setting increases the response time. If the filter time is too short, the motor may become unstable with a lighter
load.
44
Tuning Procedure
Increase the integral time (b5-03)
• If oscillation cycle time is close to the
derivative time, reduce the derivative
time (b5-05).
• If the derivative time is set to 0.00 s and
oscillations are still a problem, reduce
the proportional gain (b5-02) or increase
the PID primary delay time (b5-08)
Parameter Name
Energy Saving Control Selection
Name
Energy Saving Coefficient Value
YASKAWA ELECTRIC SIEP C710636 10C Z1000U HVAC MATRIX Drive Programming Manual
Result
Response
Response
Setting Range
0, 1
Setting Range
0.00 to 655.00
Before adjustment
After adjustment
Time
Before adjustment
After adjustment
Time
Default
Determined by
A1-02
Default
Determined by
E2-11, and o2-04
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