Hitachi NES1-002LB, Quick Reference Manual

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Chapter 7 Explanation of Functions
7 - 39
7.5.19 Energy-saver operation
[A085/A086]
The energy-saver operation function allows you to automatically minimize the inverter output power while
the inverter is driving the motor at constant speed. This function is suited to operating a fan, pump, or other
load that has a reduced-torque characteristic.
To use this function, specify "01" for the operation mode selection (A085).
Use the energy saving mode tuning function (A086) to adjust the response and accuracy of the
energy-saver operation.
The energy-saver operation function controls the inverter operation comparatively slowly. Therefore, if a
sudden change in the load occurs (e.g., impact load is applied), the motor may stall, and, consequently,
the inverter may trip because of overcurrent.
Item Function code Data Description
Operation mode selection A085
00 Normal operation
01 Energy-saving operation
Item Function code Data Response Accuracy
Energy saving mode tuning A086
0
100
Slow
Quick
High
Low
7.5.20 Stabilization constant setting
The stabilization constant setting function allows you to adjust the inverter to stabilize the motor operation
when the motor operation is unstable.
If the motor operation is unstable, check the motor capacity setting (H003/H203) and motor pole setting
(H004/H204) to determine whether the settings match the motor specifications. If they do not match,
readjust the settings. If the primary resistance of the motor is less than the standard motor specification, try
to increase the setting of "H006/H206 " step by step. Try to reduce the setting of "H006/H206 " if the
inverter is driving a motor of which the capacity is higher than the inverter rating.
You can also use the following methods to stabilize the motor operation:
1) Reducing the carrier frequency (b083)
2) Reducing the V/f gain setting (A045)
Item Function code Data Description
Stabilization constant H006/H206 0. to 255.
Increase or reduce the setting to stabilize
the motor.
V/f gain setting A045/A245 20. to 100. (%) Reduce the setting to stabilize the motor.
Carrier frequency setting b083 2.0 to 15.0 (kHz) Reduce the setting to stabilize the motor.