Hitachi SJ700-2 Energy-saver operation, Accuracy, Energy saving mode tuning A086

Related code

A085: Operation mode selection

A086: Energy saving mode tuning

Chapter 4 Explanation of Functions

(2)Curve constant (swelling degree)

Specify the swelling degree of the acceleration curve with reference to the following graphs:

Output frequency (Hz)				Output frequency (Hz)				Output frequency (Hz)
Target				Target				Target
frequency				frequency				frequency
(100%)				(100%)				(100%)
96.9		10	02	99.6
82.4				93.8
				87.5	10
				68.4				65
				64.6		02
				35				35.4			02
								31.6				10
								12.5
17.6
	02					10		6.25
3.1		10						0.39
	25	50	75	Time	25	50	75	Time	25	50	75	Time

Acceleration time (100%) to reach the set output frequency

Acceleration time (100%) to reach the set output frequency

Acceleration time (100%) to reach the set output frequency

The acceleration or deceleration time may be shortened midway through the acceleration or deceleration according to the S-curve pattern.

If the LAD cancellation (LAC) function has been assigned to an intelligent input terminal and the LAC terminal is turned on, the selected acceleration and deceleration patterns are ignored, and the output frequency is quickly adjusted to that specified by the frequency command.

(3)Curvature of EL-S-curve pattern

When using the EL-S-curve pattern, you can set the curvatures (A150 to A153) individually for acceleration and deceleration.

If all curvatures are set to 50%, the EL-S-curve pattern will be equivalent to the S-curve pattern.

Output frequency rate (%)

100

50

Curvature for acceleration 2 (A151)

Curvature for deceleration 1 (A152)

Curvature for deceleration 2 (A153)

Curvature for	Time (s)
acceleration 1 (A150)

4.2.26 Energy-saver operation

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
		02	Fuzzy operation
Item	Function code	Data	Response	Accuracy
Energy saving mode tuning	A086	0	Slow	High
		100	Quick	Low

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