User manual

Chapter 5 Parameter Introductions
Note:
◆The motor’s slip changes with the load torque, which results in the variance of motor
speed. The inverter output frequency can be adjusted automatically through slip
compensation according to the load torque. Therefore, the electrical characteristics of
the mechanical hardness are improved. As shown in Fig. 5-9-1.
Synchronous
speed
n
T
Freq. after
compensation
Compensation Freq. Δ f
Load torque
Fig. 5-9-1 Auto slip compensation diagram
◆In rated torque state, the value of slip compensation is: Gain of Slip Frequency
compensation (P9.00) × Rated slip (Synchronous speed- Rated speed)
◆Electro motion state: Increase the gain of slip compensation (P9.00) gradually when
the actual speed is lower than the reference speed.
◆Generating state: Increase the gain of slip compensation (P9.00) gradually when the
actual speed is higher than the reference speed.
 Tips:
The value of automatically slip compensation is dependent on the motor’s rated slip;
therefore, the motor rated speed (PA.08) must be set correctly.
Slip compensation is disabled when Gain of slip compensation is set to “0”.
P9.02 Energy saving control selection
Range: 0,1 【0】
0: Disabled 1: Enabled
Note:
◆The energy saving control parameters have been preset at the factory to the optimum
values. It is not necessary to adjust them under normal operation. If your motor
characteristic has great difference from those of standard induction motors, refer to
the following description to adjust the parameters.
P9.03 Energy saving gain
coefficient
Range: 0.00～655.3 【This value depends on
the inverter model】
Note:
◆The energy saving gain coefficient used in the energy saving control mode is for
calculation of the voltage at which motor efficiency will be the greatest, and set the
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